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Silicon and silicon carbide hybrid enhanced aluminum-base composite material and preparation method thereof

An aluminum-based composite material and a composite material technology are applied in the field of ultra-high volume fraction aluminum-silicon carbide composite materials and their preparation, which can solve the problem of high reliability, achieve high density, improve mechanical properties, and good social and economic benefits. Effect

Inactive Publication Date: 2013-04-17
镇安明科电子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the deficiencies in the above-mentioned background technology, the present invention provides a silicon and silicon carbide hybrid reinforced aluminum-based composite material and its preparation method, which overcomes the existing single aluminum-silicon composite material or aluminum-silicon carbide composite material in their respective Insufficient in performance, the volume fraction of silicon or silicon carbide can be adjusted within a certain range, the preparation cost is low, the process is convenient, and the near-net shape of complex shape and large size can be realized, the comprehensive performance can be adjusted arbitrarily, and the reliability is high

Method used

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Experimental program
Comparison scheme
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preparation example Construction

[0015] The preparation method of the present invention comprises the following steps:

[0016] Put silicon carbide coarse powder, silicon carbide fine powder, silicon carbide micropowder, silicon fine powder and silicon micropowder into the mixer and mix for 12 to 15 hours; then add additives and mold under 3MPa low pressure injection molding pressure, when low pressure injection molding The mass ratio of the additives added to the raw materials is 18-53% of paraffin, 1-4% of oleic acid; coat a 5-layer thick shell on the surface of the molded part with water glass and alumina powder, and dry it at 50℃~70℃ for 6~ 8 hours; followed by dewaxing and sintering the molded body and shell, the dewaxing and sintering process is as follows: dewaxing heating rate 2°C / min-3°C / min, dewaxing temperature 100°C-120°C, holding time 240 min, The sintering heating rate is 3°C / min-5°C / min, the sintering temperature is 1050-1100°C for 2-4 hours, and the cooling rate is 10°C / min-20°C / min; The sili...

Embodiment 1

[0030] Put silicon carbide fine powder with a particle size of 30-63 μm and silicon micro-powder with a particle size of 6-12 μm at 25% and 25% by volume into a mixer and mix for 12-15 hours; then add additives and mold under 3MPa low-pressure injection molding pressure , the mass ratio of additives added during low-pressure injection molding to raw materials is 46% paraffin and 4% oleic acid; coat a 5-layer thick shell on the surface of the molded part with water glass and alumina powder, and dry it at 50°C to 70°C for 6 ~8 hours; followed by dewaxing and sintering of the molded body and shell, the dewaxing and sintering process is: dewaxing heating rate 2℃ / min~3℃ / min, dewaxing temperature 100℃~120℃, holding time 240 min , the sintering heating rate is 3°C / min~5°C / min, the sintering temperature is 1050~1100°C for 2~4 hours, the cooling rate is 10°C / min~20°C / min; The prefabricated form mixed with silicon carbide is placed in a pressure infiltration furnace to preheat to 700°C,...

Embodiment 2

[0032] Put the silicon carbide fine powder with a particle size of 30-63 μm and the silicon micro-powder with a particle size of 6-12 μm into the mixer according to the volume ratio of 40% and 20% and mix them for 12-15 hours; then add additives and mold under the pressure of 3MPa low-pressure injection molding The mass ratio of additives added during low-pressure injection molding to the raw materials is 37% paraffin and 3% oleic acid; coat a 5-layer thick shell on the surface of the molded part with water glass and alumina powder, and dry it at 50°C to 70°C for 6 ~8 hours; followed by dewaxing and sintering the molded body and shell, the dewaxing and sintering process is: dewaxing heating rate 2℃ / min~3℃ / min, dewaxing temperature 100℃~120℃, holding time 240 min , the sintering heating rate is 3°C / min~5°C / min, the sintering temperature is 1050~1100°C for 2~4 hours, the cooling rate is 10°C / min~20°C / min; Put the prefabricated form mixed with silicon carbide into the air pressur...

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Abstract

The invention relates to a silicon and silicon carbide hybrid enhanced aluminum-base composite material and a preparation method thereof, which overcome the shortcomings of the traditional single aluminum-silicon composite material or aluminum / silicon carbide composite material in performance. The silicon and silicon carbide hybrid enhanced aluminum-base composite material has the advantages of adjustable volume percent of the silicon or the silicon carbide within a certain range, low preparation cost and convenient process. In a technical scheme adopted by the invention, the composite material comprises the following ingredients in percentage by volume: 0-50% of coarse silicon carbide powder, 10-20% of fine silicon carbide powder, 5-10% of micro silicon carbide powder, 10-20% of fine silicon powder, 5-40% of micro silicon powder, 8-57% of metal aluminum element, 1.9-2.7% of metal silicon element and 0.1-0.3% of metal magnesium element; and the particle sizes of the coarse silicon carbide powder, the fine silicon carbide powder, the micro silicon carbide powder, the fine silicon powder and the micro silicon powder are respectively 120-210 microns, 30-63 microns, 6-12 microns, 30-50 microns and 6-12 microns.

Description

1. Technical field: [0001] The invention relates to a metal matrix composite material, in particular to an ultra-high volume fraction aluminum silicon carbide composite material and a preparation method thereof. 2. Background technology: [0002] In the background technology, aluminum-silicon composite materials and aluminum-silicon carbide composite materials have their own characteristics. The former has the advantages of low thermal expansion coefficient, low density, easy processing, easy coating, and easy welding. The latter has high thermal conductivity, high strength, and elasticity. High modulus, good wear resistance and other advantages, so combining the characteristics of the two can prepare a silicon and silicon carbide hybrid reinforced aluminum matrix composite material with excellent comprehensive performance. 3. Contents of the invention: [0003] In order to solve the deficiencies in the above-mentioned background technology, the present invention provides ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/00C22C1/10
Inventor 马俊立杨军
Owner 镇安明科电子材料有限公司