Title of Invention

"A PROCESS FOR MAKING AN ANNEALING BAND AND AN ANNEALING BAND OBTAINED THEREFROM"

Abstract The invention relates to a process for making an annealing band, the process comprising (a) producing a refractory metal powder; or refractory metal alloy powder; (b) optionally blending the powder with an oxide component or a carbide component; (c) consolidating the powder or powder blend and forming a consolidated powder component; (d) subjecting the consolidated powder component to thermo-mechanical treatment and forming a sheet, or tube; (e) cutting the sheet into a strip; and (f) forming an annealing band from the strip. Then invention also relates to annealing bands and processes for using annealing bands.
Full Text The present invention relates to a process for making an annealing band and an annealing band obtained therefrom.
- BACKGROUND OF THE INVENTION
Participants of the wire-making industry have had a Jong-felt need, for better annealing bands, better methods for making annealing bands, and better methods for annealing a mefa! wire, in wire drawing arts, it is common practice to anneal copper wire in-line through resistance heating between drawing steps, or as a finai heat treatment. For that purpose the wire is passed over two wheels (shives) with a voltage applied to them. That way, a current is passed through the wire, which heats the wire to its annealing temperature. A so-called 'annealing band', which is part of
the wheels (s.hive) assembly), provides the contact area for the wire when it passes over the wheel. An annealing wheel assembly (shive) can be a water coo! hub and plate on one side, and a second plate that bolts to the assembly with the annealing .band covering the hub. It looks simiiar to a pulley and fan belt, with the wire being the belt
Nickel or nickel alloys are ordinarily used to make annealing bands. Unfortunately, wire manufacturers report that the lifetime of currently used annealing bands is very short and that frequent replacements of annealing bands are necessary. Wear.mechanisms include friction between the wheel (shive) and the wire and arcing due to the voltage drop between the band and the wire. When replacing a worn annealing band, the equipment needs to be shutdown, which constitutes two problems: loss of manufacturing time and interruption of a continuous process. Some efforts have been directed to producing anneaiing bands consisting of copper and niobium^ However, such efforts have faiied to produce an annealing band with suitable properties.
For the foregoing reasons, there is a need to develop improved anneaiing bands.
For the foregoing reasons, there is a need fo develop improved methods for making such bands.
For the foregoing reasons, there is a need to develop improved methods for annealing a 'metal wife."
SUMMARY OF THE INVENTION
The invention relates to a process for making an annealing band that involves the steps of (a) producing a refractory metai powder; (b) optionally blending the powder with an oxide component or a nitride component or a carbide component; (c) consolidating the powder or powder blend and forming a consolidated powder component; (d) subjecting the consolidated powder component to thermo-mechanicaS treatment and forming a sheet, or tube: (e) cutting the sheet, or tube into a strip, or ring; and (f) forming an annealing band from the strip, in which the annealing band exciudes an annealing band consisting of copper and niobium.
The invention also relates to a member comprising a refractory metal annealing band, in which the annealing band excludes an annealing band consisting of copper and niobiumThe invention also relates to a process for annealing a metal wire that involves the steps of (a) providing two annealing wheel assemblies (an annealing shive), in which each comprising a first annealing whee!(shive body), a second annealing wheel (shive plate)and an annealing band such that the first annealing wheel and the second annealing wheel that are attached to each other each have a refractory metal annealing band, located between the first annealing wheel and the second annealing wheel, for providing a contact area for a wire; (b) passing a wire over the annealing bands of both annealing wheel assemblies; (c) applying a voitage between the first annealing band (a current from the shix'e body, through the annealing band) and the second annealing band, and thereby passing a current to the 'wire under conditions that heat the wire to at least the annealing temperature of the wire, and thereby annealing the wire, in which the annealing band exciudes an annealing band consisting of copper and niobium
1 The invention also relates to a two-step process for making an annealing band that involves the steps of (a) cutting a sheet into a strip; and (b) forming an annealing band from the strip; in which the metal sheet has been formed by subjecting a consolidated powder component to thermomechanica! treatment; the consolidated powder component has been formed by consolidating a refractory metal powder into the consolidated powder component; and the powder has been optionally blended with an oxide component or a nitride component or a carbide component before it has been consolidated, in which the annealing band excludes
an annealing band consisting of copper and niobium.The invention also relates to a one-step process for making an annealing band comprising forming an annealing band from the strip, in which the strip has been cut from a sheet that has been formed by subjecting the consolidated powder component to thermomechanica! treatment; the consolidated powder component has been formed by consolidating a refractory metal powder into the consolidated powder component, in which the powder has been optionally blended with an oxide component or a nitride component or a carbide component before it is consolidated, in which the annealing band excludes an annealing band consisting of copper and niobium.
The invention also relates to a member comprising a refractory meta! annealing band, in which the refractory metal is selected from the group consisting of (a) niobium, (b) tantalum, (c) molybdenum, (d) tungsten, (e) niobium alioys, (f) tantalum alloys, (g) moIybderiurn alloys, (h) tungsten alloys, (i) alioys of (1) a refractory meta! and (2) a non-refractory metal selected from the group consisting of copper, nickel, titanium, iron, cobalt, and (j) combinations thereof, such that the annealing band has a thickness ranging from about 0.01" to about 0.5", a width ranging from about 0.25" to about 10", a diameter ranging from about 1.5" to about 6 ft, in which the annealing band excludes an annealing band consisting of copper and niobium.
DESCRIPTION OF THE FIGURES
These and other features, aspects, and advantages of the present invention will become better understood with reference to the following description and appended claims, where
Fig. 1 shows a side view of an annealing band;
Fig. 2 shows a cross-sectional view of the annealing band shown in Fig. 1; Fig. 3 shows a side view of an annealing wheel assembly containing the annealing band;
Fig. 4 shows a cross-sectional view of the annealing wheel assembly shown in Fig. 3.
Fig. 5 shows a srde view of a continuous gap-free annealing band of this invention.
Fig. 6 shows an anneling band with a gap in a non-destructive position. Fig. 7 shows an annealing band with a gap in a destructive position.
DESCRIPTION '
The invention relates to a process for making an annealing band. The process involves the steps of (a) producing a refractory metal powder; (b) optionally blending the powder with an oxide component or a nitride component or a carbide component; (c) consolidating the powder or powder blend and forming a consolidated powder component; (d) subjecting the consolidated powder component to thermomechanical treatment and forming a sheet or tube; (e) cutting the sheet, or tube into a strip,.or ring; and (f) forming an annealing band from the strip, in which the annealing band excludes an annealing band consisting of copper and niobiumThe refractory metal powder used in the invention can be any refractory metal powder, which when subjected to the treatment steps of the invention, produces an annealing band of the invention. Examples of suitable refractory metai powders inciude those made from (a) niobium, (b) tantalum, (c) molybdenum, (d) tungsten, (e) niobium alloys, (f) tantalum alloys, (g) molybdenum alloys, (h) tungsten alloys, (i) alloys of (1) a refractory metaland (2) a non-refractory metai selected from the group consisting of copper, nickel, titanium, iron, cobalt, and (j) combinations thereof. As used herein, the term "refractory metal" can apply to refractory metals, refractory metal .alloys., or combinations of refractory metals and refractory metal alloys.
The powder has a sufficiently low oxygen content to enable the powder-to be consolidated and subjected to thermomechanical treatments, in one embodiment, the refractory meiaf powder includes powders of tantalum, niobium or alloys of tantalum or niobium having an oxygen content of less than about 300 ppm, preferably below 200 ppm and more preferably-below 100 ppm. Such a powder can be made by a process that involves the steps of (i) providing a minus 100 mesh (or minus 60 mesh) hydride powder of a first metal selected from the group consisting of tantalum, niobium, and alloys of such metals with each other or one or both of them
with other metals, (ii) heating the hydride of the first metal in the presence of a metal
having a higher affinity for oxygen than the first metals affinity toremove; hydrogen
and oxygen in a single fieating cycle, (iii) then removing the meta! having a higher affinity for oxygen from the meta5, and (iv) thereby forming a powder of the first meta)
with an oxygen content of less than 300 ppm. Such powders are further described in U.S. Pat. No. 6,261,337, incorporated herein by reference in its entirety.
Optionally, the refractory metal powder is blended with an oxide component or a nitride component or a carbide component before it is consolidated. Suitable oxides include stable oxides in the selected metal system. Examples of stable oxides include but are not limited to magnesium oxide, silicon oxide, yttrium oxide, zirconium oxide, lanthanum oxide, calcium oxide, and combinations of such oxides. The amount at which such oxides can be used is at least about 5 ppm and can range from about 5 ppm to about 1000 ppm or from about 10 to about 500 ppm. Suitable nitrides include stable oxides in the selected metal system. Examples of suitable nitrides include but are not limited to niobium nitride, tantalum nitride, zirconium nitride, hafnium nitride, and combinations thereof. The amount at which such nitrides can be used is at least about 5 ppm and can range from about 5 ppm to about 1000 ppm or from about
10 ppm to about 500 ppm. Suitable carbides include those carbides that are stable in the selected metal system. Examples of stable carbides include, but are not iimitsd to: TaC, NbC, WC, HfC, ZrC, TiC, and combinations of such carbides The amount at which such carbides can be used is at least about 10 ppm, and can range from about 5 ppm to about 1000 ppm or from about 10 ppm to about 500 ppm.
The powder can be consolidated by any process that enables the refractory metal powder to be subjected to the treatment steps of the invention so that an annealing band of the invention can be made. Examples of suitable processes include extrusion processes, hot isostatic pressing processes, pressing and sintering processes, and combinations of the foregoing.
When extrusion is selected, the powder is consolidated at a temperature ranging from about room temperature (25°C) to about
3300°F (about 1815°C). The reduction in area of the process before extrusion and after extrusion can range from about 5:1 to about 20:1. In one preferred embodiment, the reduction in area of the process before extrusion and after extrusion is about 9:1.
When-isostat!c-pressing-is-selected,-the-powderis-optiona!iy-subjected-to-a
pressing step. Preferably, the hot isostatic pressing step is carried out by placing the powder fn a hot fsostaffc pressing can, optionally coated with a barrier layer such as
molybdenum, evacuating the can, placing the can in a hot isostatic press vessel, and subjecting the vessel to hot isostatic pressing conditions at a pressure ranging from about 10 ksi to about 45 ksi, for a period ranging from about 1 hour to about 10 hours, at a temperature ranging from about 1500°F (about 815°C) to about 2600°F (about 1427°C), preferably at least about 30 ksi for about 6 hours at 2300°F (about 1260°C).
When the powder is consolidated by pressing and sintering steps, it is possible to use uniaxiai pressing processes, cold isostatic pressing processes, and combinations of such processes. In one embodiment, instead of subjecting the pressed powder to a sintering step, the pressed powder is subjected to resistance sintering conditions, in which an electrical current passes through the powder to create sufficient heat to sinter the metal powder.
The dimensions of the consolidated powder component can vary depending on the application. Generally, the length of the consolidated powder component is at least about 4" (about 10 cm), the width of the consolidated powder component is at least about 2 (about 5 cm), and the height of the consolidated powder component is at least about 2" (about 5 cm). In another embodiment, the length of the consolidated powder component ranges from about 4" (about 10 cm) to about 40" (about 101 cm) preferably from about about 4" (about 10 cm) to about 30 ft (914 cm), in another embodiment, the width of the consolidated powder component ranges from about 0.5" (about 1.3 cm) to about 3" (about 7.6 cm), preferably from about 0.5" (about 1.3 cm) to about 40 "(1219 cm). In another embodiment, the height of the consolidated powder component ranges from about 0.5" (about 1.3 cm) to about 3" (7.6 cm), preferably from about 0.5" (about 1.3") to about 40" (about 1219 cm). The thermomechanica! treatment step involves a combination of forging, rolling, and annealing steps.
The forging step can be carried out under any conditions that enables the annealing band of the inventionjo be formed. In one embodiment, the forging step is carried out at a temperature ranging from about room temperature to about 1800°F, preferably at room temperature, into a sheet bar having a thickness ranging from about 0.5° to about 15" (about 1.3 cm to about 38 cm); a width ranging from -about 2" to about 60" (about 5 cm to about 152 cm) and a length ranging from about 2" to about 30 ft. (about 5 cm to about 914 cm). In another embodiment, the sheet
bar has a thickness of about 1.5 inches, a width of about 4.5 inches, and a length of about 40 inches (102 cm).
The roiiing step can be carried out under any conditions that enables the
annealing band of the invention to be formed. The roiling step generally involves rolling a sheet bar into a sheet having a thickness ranging from about 0.010" to about 0.5" (about 0.03 cm to about 1.3 cm), a width ranging from about 0.25" to about 60" (about 0.64 cm to about 152 cm), and a length ranging from about 5" to about 100 ft. (about 12.7 cm to about 3048 cm). In another embodiment, the sheet has a thickness of about 4 millimeters, a width of about 30 inches, and a length of about 5 feet (about 152.4 cm).
The annealing step can be carried out under any conditions that enables the annealing band of the invention to be formed. Generally, the annealing step is earned out at a temperature ranging from about 850°C to about 2000 °C, preferably from about 1000 to about 1400°C.
In one embodiment, the process further includes at least one intermediate annealing step. Preferably, the annealing step is carried out after about a 70% to 90% total deformation. For example, when the consolidated powder component is rd!!ed and its thickness is reduced to about 80% of its original thickness, an intermediate annealing step can be carried out before performing the forging step.
The sheet is cut into a strip having a thickness ranging from about 0.01" (about 0.03 cm) to about 0.5° (about 1.3 cm), a width ranging from about 0.25" (about 0.64 cm) to about 10" (about 305 cm), and a length ranging from about 5" (about 12.7 cm) to about 20 ft (about 610 cm). In one embodiment, the strip is a niobium strip having a hardness ranging from about 60 Vickers to about 200 Vickers. In another embodiment the strip is a molybdenum strip having a hardness ranging from about 190 Vickers to about 400 Vickers. In another embodiment, the strip is a tungsten strip having a hardness ranging from about 300 Vickers to about 600 Vickers.
The annealing band is formed by placing the strip on a three point bender or any other method from which annealing band can be formed from the strip.
In one embodiment an annealing band of this invention can be made from
ingot Metallurgy (I/M) techniques.
The annealing band of the invention is made from (a) niobium, (b) tantalum, (c) molybdenum, (d) tungsten, (e) niobium alloys, (f) tantalum alloys, (g) molybdenum alloys, (h) tungsten alloys, (i) alloys of (1) a refractory metal and (2) a non-refractory metal selected from the group consisting of copper, nickei, titanium, iron, cobalt and (j) combinations thereof. The annealing band can be attached to an annealing wheel assembly of an in-line annealer. When used in an in-line annealer, the annealing band remains useful for a period of more than 36 hours of continuous operation of the annealer, or for a period of more than 160 hours, or more, of continuous operation of the annealer. In one embodiment, the annealing band remains useful for a period ranging from more than 36 to about 160 hours of continuous operation of the annealer.
When it is said that the annealing bands are "useful," it means that the annealing bands can anneal wire in an in-line annealer continuously without requiring replacement of the annealing band and without shutting down the in-line annealer (Or the processing line).
The annealing bands of the invention preferably have a high arc resistance, which is related to high meiting point and is believed to be an advantageous property in annealing bands.
Further, the annealing bands preferably are not soluble with the wire that touches the annealing band at high temperature, e.g., copper wire.
The dimensions of the annealing band are such that that the annealing band can be used in a wire-making machine that uses an annealing band. Preferably, the annealing band has a thickness ranging from about 0.01" to about 0.5°, a width ranging from about 0.25" to about 10", and a diameter ranging from about 1.5" to about 6 ft. In one embodiment, the annealing band has a thickness of about 4 mm thick, a width ranging from about 20 to about 25 mm, and a diameter ranging from about 350 to about 500 mm. The annealing band can be (i) open-ended, (ii) welded together, or (iii) open-ended with overlapping beveled ends.
Advantageously, an annealing band of the invention preferably has a uniform microstructure. For instance, when the annealing band is made of (1) a refractory metal and (2) a non-refractory metal such as copper or nickei or titaniumL or iron, or. cobalt, uniformly distributed throughout the annealing band. Alternatively, when the annealing band of the invention is made of a combination of refractory metals, the
chemicai composition of the alloy is uniform throughout the annealing band. And when the annealing band is made of a single refractory metal, the microstructure of the annealing band is uniform throughout the annealing band. Uniformity of phase distribution, chemical composition and microstructure corresponds to uniform physical properties, features that are valued by wire manufacturers.
In use, the process of the invention produces a suitable refractory metal powder. The powder is optionaRy blended with an oxide component or a nitride component or a carbide component and the powder or powder blend is consolidated such that a consolidated powder component forms. The consolidated powder component is subjected to thermo-mechanical treatment, and a sheet forms. The sheet is cut into a strip and an annealing band forms from the strip.
When the powder formation steps, the powder consolidation steps and the sheet formation steps have been pre-performed, e.g., when these steps have been performed by a service provider, the invention includes a two-step process for making an annealing band involving the steps of (a) cutting a sheet into a strip; and (b) forming an annealing band from" thestrip, in which the metalsheet has been formed by subjecting the consolidated powder component to thermomechanicai treatment, and in which the consolidated powder component has been formed by consolidating a refractory metal powder into the consolidated powder component, such that the powder is optionally blended with an oxide component or a nitride component, or a carbide component before it is consolidated.
When the powder formation steps, the powder consolidation steps, the sheet
formation step, and the sheet cutting steps have been pre-performed, the invention includes a single-step process for making an annealing band comprising forming an annealing band from the strip, in which the strip has been cut from a sheet that has been formed by subjecting the consolidated powder component to thermomechanical treatment, and in which the consolidated powder component has been formed by consolidating a refractory metal powder into the consolidated powder component, such that the powder is optionally blended with an oxide component or a nitride component, or a carbide component before it is consolidated, in which the annealing band excludes an annealing band consisting of copper; and niobium.
For wire-making processes, the invention includes a process for annealing a metal wire in which two an annealing wheel assemblies are provided. Each annealing wheel (shive) assembly includes a first annealing wheel (shive body), a second annealing wheel (plate) and an annealing band, in which the first annealing wheel (body) and the second annealing wheel(piate) that are attached to each other each have a refractory rnetai annealing band, located between the first annealing wheel (body) and the second annealing wheel (plate), for providing a contact area for a wire. The annealing band can be attached to an annealing wheel (shive)assembly by any suitable technique, e.g., by clamping the annealing band into the annealing wnee!(shive) assembly. A wire passes over the annealing bands of both annealing wheel assemblies and a voltage is applied between the first annealing band and the second annealing band, so that a current passes through the wire under conditions that heat the wire to at least the annealing temperature of the wire. The voltage that passes from the annealer can vary depending on application.
The wire that can be subjected to such annealing conditions include copper wires, copper alloy wires, aluminum wires, aluminum alloy wires, steel wires, steel alloy wires, and combinations thereof. The dimensions of the wire that can be used can range from about 0.002" (about 0.006 cm) to about 0.1" (about .23 cm). Of course, wires having other dimensions can be used as well.
Referring to the figures, Fig. 1 shows a side view of an open-ended annealing band 5. Sectional lines 1 and 3 of Fig. 1 refer to the cross-sectional view of the annealing band shown in Fig 2; Fig. 3 shows an annealing wheel assembly 1 1 containing the annealing band 13; and sectional lines 7 and 9 refer to the cross-sectional view of Fig. 4, in which the annealing band 15 is attached to the annealing wheels 17 and 19.
In one embodiment, an annealing band of the invention has a gap. In another
embodiment, however, the annealing band of this invention is continuous and does not include a gap. Fig. 5 shows a continuous, gap free annealing band made in accordance to the invention. Fig. 6 shows an annealing band with a gap in a nondestructive position (the gap does not coincide with the wire leaving the band). Fig. 7 shows an annealing band with t a gap in a , destactiye position (the gap coincdes with
the wire leaving the band). Without being bound fay theory, it is believed that when an annealing band has a gap, it breaks the circuit (in which the current is transferred
from the annealing band to the wire), and increases arcing or the likelihood of arcing (an undesired erosion of the band). The use of a continuous band reduces arcing. Advantageously, the use of a continuous annealing band allows the wear to be evenly distributed through the entire length of the band. The use of a continuous annealing band imparts a continuous electrical field throughout the band, and thereby evenly distributes the arcing throughout the band, and removes the potential for excessive arcing caused by the gap in the band. Currently, in ordinary annealing bands (which contain gaps), the arcing is concentrated on 14% of the band, just beyond the gap.
The life of a continuous annealing band made in accordance to the invention is generally longer than the life of an annealing band made in accordance with the invention (with gaps) and substantially longer. Generally, a continuous annealing band of this invention has a life that is at least about 50% to about 80% more, or more than about 80%, as compared to an annealing band made in accordance with the invention (with a gap). As compared to ordinary annealing bands (not made with the materials of this invention) a continuous annealing band of this invention has lasts at least about 100%, or more than about 200%, or more than about 300% in ordinary use. In one embodiment, the continuous annealing band of this invention lasts from about 100% to about 1000%, or more, as compared to ordinary annealing bands, e.g., nickel bands.
A continuous annealing band of this invention is made by any suitable method. Generally, a continuous annealing band is made by determining the length and roundness of the band, and the joining of the two ends of the band after fabrication as described above. The shaping of the band can be done using standard metal working practices, and joining of the ends can be accomplished using standard metal working practices as well, such as 3 point bending and welding. Other possible methods of manufacture are to produce a tube of sufficient diameter and thickness, and section widths to produce a continuous band.
Advantageously, the invention provides improved annealing bands, improved methods for making such bands, and improved methods for annealing wires. The annealing band ofthe.invention annealing bands and allow, wire manufacturers to run annealers for extended periods of time. The invention is especially useful for in-line annealers in wire manufacturing because the use of the
annealing band can decrease maintenance and equipment down time. When niobium annealing bands of the invention are used, the niobium bands can be more than 10 times more durable than conventional nickel bands.
The invention is further described in the following illustrative examples in which all parts and percentages are by weight unless otherwise indicated.
EXAMPLES EXAMPLE 1
PROCEDURE
The cutting rates of various materials (see table below) were measured when cut by Electro Discharge Machining (EDM). In this case a wire was used as the cutting tool (Wire-EDM). For EDM the workpiece is immersed in petroleum or water. A voltage was applied between the workpiece and the wire, and the wire was brought so close to the workpiece that electric arcs were initiated from the wire to the workpiece. Each arc evaporated a very small volume of material at the surface of the workpiece. The wire cut the workpiece, as the piece eroded through arcing. The cutting rate that can be achieved with this method was an indicator for the arc-resistance of the material. Slow cuffing rate indicated a high arc resistance. The table lists the cutting rate quantified as "cut area per hour" (square inch per hour). It can be seen that niobium had a much slower cutting rate that any of the other materials tested.
EDM experiments show slow cutting rates for Nb (See Table 1 below).
Table 1
(Table Removed)
"Giidcop™" is an oxide dispersion strengthened (ODS) copper alloy by OMG.
From these results it was concluded that niobium had a higher resistance to spark erosion than the other materials. Since spark erosion is one of the main wear mechanisms for annealing bands it was further concluded that annealing bands made from Nb wiil wear slower than bands made from the other materials and that they wili have a higher life time than other bands.
EXAMPLE 2
PROCEDURE
Vickers hardness measurements were determined according to ASTM E92-82, a weiS-known standard that describes in great detail how to perform Vickers hardness measurements. Table 2 .shows the Vickers hardness obtained for different material grades.
Table 2
(Table Removed)
(l/M): Ingot Metallurgy (P/M): Powder Metallurgy
The results showed that the P/M grade of Mb is considerably harder than l/M grade Nb. From these results it was concluded P/M Mb had a higher resistance to mechanical erosion than l/M Nb. Since mechanical erosion is one of the main wear mechanisms for annealing bands it was further concluded that annealing bands made from P/M Nb will wear slower than bands made from i/M Nb and that they will have a higher life time than l/M Nb bands.
Although the present Invention has been described in detail with,reference to
certain preferred versions thereof, other variations are possible. Therefore, the spirit
and scope of the appended claims shouid not be limited to the description .of the versions contained therein.








We claim:
1. A process for making an annealing band comprising forming an
annealing band from the strip;
wherein the strip has been cut from a sheet that has been formed by subjecting the consolidated powder component to thermomechanical treatment;
wherein the consolidated powder component has been formed by consolidating a refractory metal powder into the consolidated powder component, and
wherein the powder has been optionally blended with an oxide component or a nitride component, or a carbide component before it is consolidated, w-herein the annealing band excludes an annealing band consisting of copper and niobium.
2. A process for making an, annealing band comprising:
(a) cutting a sheet into a strip; and
(b) forming an annealing band from the strip;
wherein the metal sheet has been formed by subjecting a consolidated powder component to thermomechanical treatment;
wherein the consolidated powder component has been formed by consolidating a refractory metal powder into the consolidated powder component; and
wherein the powder has been optionally blended with an oxide component or a nitride component or a carbide component before it has been consolidated, wherein the annealing band excludes an annealing band consisting of copper and niobium.
3. A process for making an annealing band, the process comprising:
(a) producing a refractory metal powder
(b) optionally blending the powder with an oxide component or a
nitride component or a carbide component;
(c) consolidating the powder or powder blend and forming a
consolidated powder component;
(d) subjecting the consolidated powder component to
thermomechanical treatment and forming a sheet;
(e) cutting the sheet into a strip; and
(f) forming an annealing band from the strip, wherein the
annealing band excludes an annealing band consisting of copper and
niobium.
4. The process as claimed in claims 1 to 3, wherein the refractory
metal is a component selected from the group consisting of (a) niobium,
(b) tantalum, (c) molybdenum, (d) tungsten, (e) niobium alloys, (f)
tantalum alloys, (g) molybdenum alloys, (h) tungsten alloys, (i) alloys of
(1) a refractory metal and (2) a non-refractory metal selected from the
group consisting of copper, nickel, titanium, iron, cobalt, and (j)
combinations thereof.
5. The process as claimed in claims 1 to 4, wherein the annealing band
has a uniform microstructure.
6. The process as claimed in claim 1 to 5, wherein the powder has
sufficiently low oxygen content to enable the powder to be consolidated
and subjected to thermomechanical treatments.
7. The process as claimed in claims 1 to 6, wherein the refractory
metal powder has an oxygen content that is less than about 300 ppm.
8. The process as claimed in claims 1 to 7, wherein the oxides are
selected from the group consisting of magnesium oxide, silicon oxide,
yttrium oxide, zirconia oxide, lanthanum oxide, hafnium oxide, calcium
oxide and combinations thereof.
9. The process as claimed in claims 1 to 8, wherein the carbide
component comprises carbides selected from the group consisting of
TaC, WC, HfC, TiC, NbC, ZrC, stable carbides other than the foregoing,
and combinations thereof.
10. The process as claimed in claims 1 to 7, wherein the powder is
consolidated by a process selected from the group consisting of extrusion
processes, hot isostatic pressing processes, pressing and sintering
processes, and combinations of the foregoing.
11. The process as claimed in claim 1 to 10, wherein the powder is
consolidated at a temperature ranging from about room temperature to
about 3300°F by extrusion and the process has a reduction in area
before extrusion and after extrusion of about 9:1.
12. The process as claimed in claims 1 to 11, wherein the powder,
optionally subjected to a pressing step, is consolidated by hot isostatic
pressing.
13. The process as claimed in claim 12, wherein the hot isostatic
pressing step is carried out by placing the powder in a hot isostatic
pressing can, optionally coated with a barrier layer, evacuating the can,
placing the can in a hot isostatic press vessel, and subjecting the vessel
to hot isostatic pressing conditions at a pressure ranging from about 10
ksi to about 45 ksi, for a period ranging from about 1 hour to about 10
hours, at a temperature ranging from about I 500°F to about 2600°F.
14. The process as claimed in claim 1 to 13, wherein the powder is
consolidated by pressing and sintering steps and the pressing step is
selected from the group consisting of uniaxial pressing processes, cold
isostatic pressing processes, and combinations thereof.
15. The process as claimed in claim 12, wherein instead of subjecting
the pressed powder to a sintering step, the pressed powder is subjected
to resistance sintering conditions, wherein an electrical current passes
through the powder to create sufficient heat to sinter the metal powder.
16. The process as claimed in claim i to 15, wherein the
thermomechanical treatment step comprises a combination of forging,
rolling, and annealing steps.
17. The process as claimed in claim 16, wherein the forging step is
carried out at a temperature ranging from about room temperature to
about 1800°C into a sheet bar having a thickness ranging from about
0.5" to about 15", a width ranging from about 2" to about 60", and a
length ranging from about 2" to about 30 ft.
18. The process as claimed in claim 17, wherein the sheet bar has a
thickness of about 1.5 inches, a width of about 4.5 inches, and a length
of about 40 inches.
19. The process as claimed in claim 16, wherein the rolling step
comprises rolling a sheet bar into a sheet having a thickness ranging
from about 0.010" to about 0.5", a width ranging from about 0.25" to
about 60", and a length ranging from about 5" to about 100 ft.
20. The process as claimed in claim 19, wherein the sheet has a
thickness of about 4 millimeters, a width of about 30 inches and a length
of about 5 feet.
21. The process as claimed in claim 16, wherein the annealing step is
carried out at a temperature ranging from about 8500 C to about 2000°
C.
22. The process as claimed in claim 16, wherein the process has at
least one intermediate annealing step.
23. The process as claimed in claim 16, wherein the sheet is cut into a
strip having a thickness ranging from about 0.01" to about 0.5", a width
ranging from about 0.25" to about 10", and a length ranging from about
5" to about 20 ft.
24. The process as claimed in claim 23, wherein the strip is a niobium
strip having a hardness ranging from about 60 Vickers to about 600
Vickers.
25. The process as claimed in claims 1 to 24, wherein the annealing
band is formed by placing the strip on a three point bender or any other
forming method and shaping the strip into an annealing band.
26. The process as claimed in claims 1 to 25, wherein the annealing
band has a thickness ranging from about 0.01" to about 0.5".
27. The process as claimed in claims 1 to 26, wherein the annealing
band has a width ranging from about 0.25" to about 10".
28. The process as claimed in claims 1 to 27, wherein the annealing
band has a diameter ranging from about 1.5" to about 6 ft.
29. The process as claimed in claims 1 to 28, wherein the annealing
band has a thickness of about 4 mm thick, a width ranging from about
20 to about 25 mm, and a diameter ranging from about 350 to about 500
mm.
30. The process as claimed in claims 1 to 29, wherein the process
further comprises attaching the annealing band to an annealing wheel
assembly of an in-line annealer.
31. The process as claimed in claims 1 to 30, wherein the annealing
band is (i) open-ended, (ii) welded together, or (iii) open ended with
overlapping beveled ends.
32. The annealing band obtainable from the process as claimed in any
of claims 1 to 31.

Documents:

3039-delnp-2005-abstract.pdf

3039-delnp-2005-claims.pdf

3039-delnp-2005-complete specification (as filed).pdf

3039-delnp-2005-complete specification (granted).pdf

3039-delnp-2005-correspondence-others.pdf

3039-delnp-2005-correspondence-po.pdf

3039-delnp-2005-description (complet).pdf

3039-delnp-2005-drawings.pdf

3039-delnp-2005-form-1.pdf

3039-delnp-2005-form-18.pdf

3039-delnp-2005-form-2.pdf

3039-delnp-2005-form-3.pdf

3039-delnp-2005-form-5.pdf

3039-delnp-2005-gpa.pdf

3039-delnp-2005-pct-101.pdf

3039-delnp-2005-pct-210.pdf

3039-delnp-2005-pct-304.pdf

3039-delnp-2005-pct-306.pdf

3039-delnp-2005-petition-137.pdf

3039-delnp-2005-petition-138.pdf


Patent Number 244909
Indian Patent Application Number 3039/DELNP/2005
PG Journal Number 53/2010
Publication Date 31-Dec-2010
Grant Date 24-Dec-2010
Date of Filing 07-Jul-2005
Name of Patentee H.C. STARK, INC.
Applicant Address 45 INDUSTRIAL PLACE, NEWTON, MA 02461, U.S.A.
Inventors:
# Inventor's Name Inventor's Address
1 PRABHAT KUMAR 31 PINEWOOD PLACE, NEWTON, MA 02461, U.S.A.
2 JOHN DURHAM 1B HOLLIS STREET, CAMBBRIDGE, MA 02140, USA.
3 RICHARD R. MALEN 1 EAST MAIN STREET, AYER, MA 01432, USA.
4 HOWARD V. GOLDBERG 34 DONNA ROAD, FRAMINGHAM, MA 01701, USA.
5 HENNING UHLENHUT H.C. STARD GMBH, ROBERT-FRIESSE-STRASSE 4, D-07629 HERMSDORF, GERMANY.
PCT International Classification Number B22F 3/16
PCT International Application Number PCT/US2004/002695
PCT International Filing date 2004-01-30
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 60/444,004 2003-01-31 U.S.A.