Title of Invention | ALUMINIUM-BASED POWDER COMPOSITE MIXTURE AND METHOD FOR THE PRODUCTION THEREOF |
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Abstract | The invention relates to powder metallurgy and may be used as a construction material for accurate engineering products including design of control devices for aircraft flight director systems with high operating features. The inventive powder composite mixture comprises components with the following component ratio: 41-41 mass % silicon, 4,1 -5,2 mass % nickel, 0,05 - 0,1 mass % phosphorus, 0.01-0.05 mass % aluminium nitride, the rest being aluminium. The inventive method for producing said powder composite mixture consists in preparing a melt containing aluminium, silicon, nickel, spraying the melt, with creation of powder and then combining the received powder with silicon powder, wherein during the melt production with additional phosphorus content, subsequently nitrogen is injected and the melt pulverization is carried out by nitrogen at a temperature and pressure which enable the aluminium nitride to be formed. Said invention allows to obtain the material with homogenious fine-dispersed structure and processing plasticity, which ensures a satisfactory deformation treatment of the product with coefficient of linear expansion, vacuum density and dimensional stability at berillium level, thereby substantially promoting the operational reliability of the products for a long service life. The inventive material in comparison with berillium is ecologically pure. |
Full Text | IPC C22 C21/02, 1/04 ALUMINIUM-BASED POWDER COMPOSITE MIXTURE AND METHOD FOR THE PRODUCTION THEREOF Technical field of the invention The invention relates to powder metallurgy and may be used in different fields of national economy (engineering, aircraft, rocket technology, shipyard, automobile, textile and others) where it's necessary to combine the following product properties: low coefficient of linear expansion, high dimensional stability, light specific weight, satisfactory treatability and ecological purity. Previous level of technology It's obvious that at present one of the main construction material , for instance for manufacturing of command devices of aircraft control systems, is berillium which meets necessary requirements to device components: light specific weight, low coefficient of linear expansion, high dimensional stability, vacuum-tightness and other. (Nikitin E.A., Shestov S.A., Matveev V.A. "Gyroscopic systems. Elements of gyroscopic devices." Moscow, High school, 1988, p.432) The main drawback of this material is high work content of its production, high cost and its toxicity during processing. It's known the composite material which consists of the aluminium-based melt with the following admixtures: 25% silicium, 5% nickel and high-melting combination 15% silicium nitride ( RF Patent N 2016120, IPC cl.C22 C 21/14, 32/00 dated from 17.05.91) The drawback of this material is impossibility to secure reliability and stability of the required operating characteristics for a long service life. It's known the powder composite material, which consists of the aluminium-based melt with the following admixtures: silicium, nickel and high-melting component 1 as powdered crystalline silicon, which has the same physico-mechanical properties as berillium. (RF Patent N 2149201, IPC cl.C22 C 21/14, 32/00 dated from 20.05.2000). The drawback of this material is low manufacturing plasticity, instability of operating characteristics due to structure inhomogeneity, presence of gas porosity , high specific weight and coefficient of linear expansion that reduce product operation safety. It's known the composite material which consists of the aluminium-based melt with admixture of silicium, berillium, aluminium oxide and high-melting component like crystal silicone (RF Patent N 2175682, IPC cl. C22 C 21/02, 1/04 dated from 10.11.2001). It is accepted as the most close prototype of the proposed invention. The deficiency of this material is availability of structure inhomogeneity, low manufacturing plasticity, using toxic beryllium material as an alloying ingredient. It's known the production method of the composite material, including preparing the melt containing aluminium, copper, magnesium, addition of silicon carbide powder (Romanova VS, Trubkina KM "Production of pressed half-finished product from powder composite and investigation of its properties." S-Pb, Technology of light alloys, VILS, 1993, N° 12, p.49-53) The drawback of this method is rather high density of the material, high coefficient of linear expansion and insufficient dimensional stability. It's known the production method of the composite material, including preparing the melt containing aluminium, nickel, silicon, spraying and addition of silicon powder. (RF Patent N 2149201, IPC cl.C22 C 21/14, 32/00 dated from 20.05.2000). The lack of this method is instability of material operating characteristics and uncertainty of its performance during long service life due to structure inhomogeneity, presence of gas porosity and poor dimensional stability. It's known the production method of composite material, including preparing the melt containig aluminium, silicon, nickel, berillium, aluminium oxide, spraying, 2 addition of silicon powder (RF Patent N 2175682, IPC cl. C22 C 21/02, 1/04 dated from 10.11.2001), accepted as the most close prototype of the proposed invention. The drawback of this method is impossibility to keep operational characteristics unchanged during long service life of the product. Brief summary of the invention. Assigned task is settled by that the powder composition on the base of aluminium including silicon, nickel, accordingly to invention, contains in addition phosphorus and aluminium nitride with the following component ratio, mass %: - Silicon 41-43% - Nickel 4,1-5,2% - Phosphorus 0,05-0,1% - Aluminium nitride 0,01-0,05% - Aluminium - remaining Manufacturing method of the composite mixture including preparing the melt containing aluminium, silicon, nickel, spraying, supplemented with powdered silicon, wherein during production process accordingly to invention phosphorus isinjected in addition, and the melt dispensing is conducted by nitrogen at a temperature and pressure providing formation of the aluminium nitride in desired volume. The proposed composition of powder mixture and its production method allow: - Firstly, to realize modification action of the original silicon crystals by complication their growth due to adsorption phosphorus atoms on the faces of growing crystals and also to enlarge the numbers of crystallization centers- crystallizable clusters (Sik) - Secondly, owing to combined interaction of the modification process and the process of nitride phase formation (AIN) to obtain the highest cooling rate of the soluble melt and subsequently to reduce the growing rate and more uniform distribution of an original silicon crystals as well 3 as intermetallic phase NiAL3, FeAl3, A1N, A1P in the size of the solid solution matrix for every particle. - Thirdly, formation of nitride phase on the juvenile surface powder particles enables to intensification of diffused processes during the next redivision powder to half-finished product. This turns out that the material structure corresponds to an aluminium a-solid solution with fine-dispersed and uniform distributed in it an extraction of silicon crystal extraction and intermetallic phase NiAL3, FeAl3, A1N, A1P. The same structure is characterized by sharp space reduction between silicon crystals and intermetallic phase and subsequently significant increasing the contact surface with aluminium matrix. In this issue the strength of interparticle ties increases which promote to rise physical-mechanical properties of the material as well as elastic modulus. The material with high elastic modulus is described by the presence of the hard ties in the structure when attraction forces effect stronger than repulsion forces. In this connection elastic modulus is being the reciprocal quantity to the coefficient of linear expansion, assist that receiving material is less exposed to broadening under temperature impact. All these facts assist to obtain the product with a-solid aluminium solution structure with even distributed in it disperse silicon crystals and intermetallic phase NiAL3, FeAl3, A IN, A IP, to enlarge mechanical properties, reducing specific density and the coefficient of linear expansion, to increase a dimensional stability, vacuum-tightness and process plasticity. Component content (silicon, nickel, phosphorus, aluminium nitride) less than stated doesn't make it possible to reach in the matrix of a-solid aluminium solution the additional dispersion and uniform distribution of the original silicon crystals and intermetallic phase (like NiAL3, FeAl3, A IN, A IP) and possibility the nitride phase to be formed. This will result in reducing the strength as well as resistance of interparticle ties in the whole between alluminium matrix and intermetallic phase. As a result the strength and plasticity characteristics are reduced, including 4 elastic modulus, the coefficient of linear expansion is growing up, dimensional stability and the process material plasticity are reduced both. The component content (silicon, nickel, phosphorus, aluminium nitride) higher than stated due to the melt remodification leads to increasing the size of original silicon crystals, which impact negatively on homogeinity structure, and therefore allows to increase the coefficient of linear expansion, reducing dimensional stability and process plasticity both. Realization of the invention. Examples of production the powder composite mixture: They took aluminium ingots the quality not lower than A7, crystal silicon grade KRO, pure nickel N-1, red phosphorous in pressed tablets, wrapped in aluminium foil, and loaded in smelting furnace, where the melt was produced. When the melt temperature reached to 1300° C the nitrogen was injected and after exposure time 30 minute the melt was pulverised by nitrogen under the pressure not less than 10 atm. on the powder which then combine with powdered silicon. Powder composite mixture was filled in process capsules, degassed in vacuum under residual evacuation 1.10" — 1.10" mm m.c. and then was pressed on the hydraulic press by effort 950 ton force. Compact material blank was exposed to mechanical treatment and their physico-mechanical properties were investigated. Variants of the component contents in powder composite mixtures matched to: proposed, extreme (with quantity smaller or higher than stated limiting value of the components in proposed method) and also to well-known the more closed analog are submitted in the table 1. The properties of material blocks for the composite materials, manufactured from investigated powder composite mixtures are submitted in table 2. Analysis data of physico-mechanical properties of the powder composite materials, specified in table 2, allows to make a conclusion that the best technical result is reached when powder composite mixture is used with proposed component content, which make it possible to obtain the powder composite 5 material, which is superior the well-known material by all determinative features of such class materials. Thus using stated component content in powder composite mixture and the proposed inventive method, we receive the material which exhibited : homogeneity and fine-dispersion structure, high physico-mechanical properties, low coefficient of linear expansion, high dimensional stability and the highest vacuum-density. Thus proposed powder composite mixture makes it possible to obtain a construction material which exhibits a high operating performance, a high operational reliability for a long service life and also it is non-toxic and inexpensive. 6 Aluminium-based powder composite mixtures and method for the production thereof Table 1 No Mixture Content of the components, % mass A1203 Be Si Ni P A1N Al 1 Proposed - - 41 4,10 0,05 0,01 the rest - - 42 4,55 0,075 0,03 the rest - - 43 5,20 0,10 0,05 the rest 2 Outrageous - - 40,5 3,50 0,03 0,005 the rest - - 43,5 5,50 0,15 0,10 the rest 3 Well-known (the analog) 2,25 0,03 44,75 4,25 - - the rest Table 2 No Material ax 10"b, K"1 6,% E,GPa Vacuum-tightness when 8 wall not less, mm Size of the initial crystals Si, mm 1 Proposed 12,0 1,8 120 0,65"°^ 1-3 12,0 1,8 120 0,65"°^ 1-3 12,2 1,5 115 0,70"^ 1,5-3,5 2 Outrageous 13,0 1,0 102 0,90-° 13,5 0,8 98 1,10^ 5-6 3 Well-known (the analog) 12,5 1,0 105 0,80-°'02 5-6 The claim. 1 .Aluminium-based powder composite mixture containing silicon , nickel, which is differing that it contains in addition phosphorus and aluminium nitride with the following component ratio: 41-43 mass% silicon, 4,1 -5,2 mass % nickel 0,05 - 0,1 mass % phosphorus 0,01 - 0,05 mass % aluminium nitride aluminium - the rest. 2.The inventive method for producing aluminium-based powder composite mixture, including preparing a melt containing aluminium, silicon, nickel, dispensing the melt, with creation of powder and then combining the received powder with silicon powder, is differing that the melt is produced with additional phosphorus content, subsequently nitrogen is injected and pulverization of the melt is conducted by nitrogen at a temperature and pressure which enable the aluminium nitride to be formed. lb: 8 The invention relates to powder metallurgy and may be used as a construction material for accurate engineering products including design of control devices for aircraft flight director systems with high operating features. The inventive powder composite mixture comprises components with the following component ratio: 41-41 mass % silicon, 4,1 -5,2 mass % nickel, 0,05 - 0,1 mass % phosphorus, 0.01-0.05 mass % aluminium nitride, the rest being aluminium. The inventive method for producing said powder composite mixture consists in preparing a melt containing aluminium, silicon, nickel, spraying the melt, with creation of powder and then combining the received powder with silicon powder, wherein during the melt production with additional phosphorus content, subsequently nitrogen is injected and the melt pulverization is carried out by nitrogen at a temperature and pressure which enable the aluminium nitride to be formed. Said invention allows to obtain the material with homogenious fine-dispersed structure and processing plasticity, which ensures a satisfactory deformation treatment of the product with coefficient of linear expansion, vacuum density and dimensional stability at berillium level, thereby substantially promoting the operational reliability of the products for a long service life. The inventive material in comparison with berillium is ecologically pure. |
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01133-kolnp-2008-correspondence others.pdf
01133-kolnp-2008-description complete.pdf
01133-kolnp-2008-international publication.pdf
01133-kolnp-2008-international search report.pdf
01133-kolnp-2008-pct request form.pdf
01133-kolnp-2008-translated copy of priority document.pdf
1133-KOLNP-2008-(15-12-2011)-FORM-27.pdf
1133-KOLNP-2008-CANCELLED PAGES.pdf
1133-KOLNP-2008-CORRESPONDENCE 1.1.pdf
1133-KOLNP-2008-CORRESPONDENCE 1.2.pdf
1133-KOLNP-2008-FORM 1 1.1.pdf
1133-KOLNP-2008-FORM 1 1.2.pdf
1133-KOLNP-2008-FORM 2 1.1.pdf
1133-KOLNP-2008-FORM 3 1.1.pdf
1133-KOLNP-2008-FORM 3 1.2.pdf
1133-KOLNP-2008-FORM 5 1.1.pdf
1133-KOLNP-2008-FORM 5 1.2.pdf
1133-KOLNP-2008-INTERNATIONAL SEARCH REPORT 1.2.pdf
Patent Number | 247405 | ||||||||||||||||||||||||
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Indian Patent Application Number | 1133/KOLNP/2008 | ||||||||||||||||||||||||
PG Journal Number | 14/2011 | ||||||||||||||||||||||||
Publication Date | 08-Apr-2011 | ||||||||||||||||||||||||
Grant Date | 05-Apr-2011 | ||||||||||||||||||||||||
Date of Filing | 17-Mar-2008 | ||||||||||||||||||||||||
Name of Patentee | FEDERALNOE GOSUDARSTVENNOE UNITARNOE PREDPRIJATIE 'NAUCHNOPROIZVODSTVENNYJ TSENTR AVTOMATIKI I PRIBOROSTROENNIJA IM. AKADEMIKA N.A. PILJUGINA' | ||||||||||||||||||||||||
Applicant Address | UL. VVEDENSKOGO, 1, MOSCOW | ||||||||||||||||||||||||
Inventors:
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PCT International Classification Number | C22C 21/02,C22C 1/05 | ||||||||||||||||||||||||
PCT International Application Number | PCT/RU2006/000441 | ||||||||||||||||||||||||
PCT International Filing date | 2006-08-22 | ||||||||||||||||||||||||
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