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Method for producing high-volume fractional silicon-carbide particle reinforced aluminium-base composite material member

A technology with high volume fraction and silicon carbide particles, which is applied in the forming field of metal matrix composite parts, can solve the problems of difficult machining of SiCp/Al composite materials, difficulty in achieving complete penetration, uneven density of formed blanks, etc.

Inactive Publication Date: 2005-07-27
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since this method uses powder metallurgy molding technology to prepare SiC preforms, the density of the preforms is not uniform, and the complexity of the shape of the parts is also greatly limited.
Especially because there is no moisture between SiCp and Al, it is difficult to achieve complete penetration even with various forms of pressurized infiltration technology, often leaving a certain amount of pores, which is a fatal weakness for electronic packaging materials
In addition, the machining of high volume fraction SiCp / Al composites is extremely difficult

Method used

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  • Method for producing high-volume fractional silicon-carbide particle reinforced aluminium-base composite material member

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1: Preparation of a SiCp / Al composite material part with a SiC volume fraction of 62%

[0012] The average particle size of SiC is 10 μm, and the binder adopts a multi-polymer component paraffin-based binder, and the weight percentage of each component is PW:HDPE:EVA:SA=79:10:6:5. The binder was mixed on a mixer at 130°C for 1.5 hours, and then mixed with SiC powder on a mixer at 110°C for 2 hours. The powder loading was 62% by volume. For injection molding, the injection temperature is 150°C and the injection pressure is 105MPa. The obtained SiC preform is first dissolved and degreased in trichlorethylene, the solution temperature is 40°C, then the SiC preform is heated to 200°C in a vacuum degreasing furnace and kept for 1 hour, and then heated to 500°C for 2 hours to completely degrease. Remove binder. The degreased SiC preform is heated up to 1000° C. and kept for 2 hours for pre-sintering to obtain a porous SiC skeleton. Finally, the Al alloy (Al alloy c...

Embodiment 2

[0013] Example 2: Preparation of a SiCp / Al composite material part with a SiC volume fraction of 64%

[0014] The average particle size of SiC is 10 μm, and the binder adopts a multi-polymer component paraffin-based binder, and the weight percentage of each component is PW:HDPE:EVA:=75:15:10. The binder was mixed on a mixer at 130°C for 1.5 hours and then mixed with SiC powder on a mixer at 110°C for 2 hours. The powder loading was 64% by volume. For injection molding, the injection temperature is 150°C and the injection pressure is 110MPa. The obtained SiC preform is first dissolved and degreased in trichlorethylene, the solution temperature is 40°C, then the SiC preform is heated to 200°C in a vacuum degreasing furnace and kept for 1 hour, and then heated to 500°C for 2 hours to completely degrease. Remove binder. Continue to heat up the degreased SiC preform to 1150° C. and keep it warm for 2 hours for pre-sintering to obtain a porous SiC skeleton. Finally, the Al alloy ...

Embodiment 3

[0015] Example 3: Preparation of a SiCp / Al composite material part with a SiC volume fraction of 69%

[0016] The average particle size of SiC is 18 μm, and the binder adopts a multi-polymer component paraffin-based binder, and the weight percentage of each component is PW:HDPE:EVA:SA=72:15:10:3. The binder was mixed on a mixer at 130°C for 1.5 hours, and then mixed with SiC powder on a mixer at 130°C for 1.5 hours. The powder loading was 69% by volume. For injection molding, the injection temperature is 160°C and the injection pressure is 120MPa. The obtained SiC preform is first dissolved and degreased in trichlorethylene, the solution temperature is 40°C, then the SiC preform is heated to 200°C in a vacuum degreasing furnace and kept for 1 hour, and then heated to 500°C for 2 hours to completely degrease. Remove binder. Continue to heat up the degreased SiC preform to 1150° C. and keep it warm for 2 hours for pre-sintering to obtain a porous SiC skeleton. Finally, the Al...

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Abstract

A technology for preparing the silicon carbide particles reinforced Al-based workpiece (SiCp / Al) with high volume fraction includes such steps as proportionally mixing SiC particles with paraffin wax based multi-polymer adhesive, stirring, granulating, injection moulding, thermal defatting in solvent, presintering at 1000-1150 deg.C, and osmosizing the molten Al alloy into SiC skeleton at 1100-1200 deg.C in N2 atmosphere.

Description

technical field [0001] The invention belongs to the forming technology of metal-matrix composite parts, and in particular provides a method for preparing high-volume silicon carbide particles reinforced aluminum-based (SiCp / Al) composite parts. The preparation of low-cost, high-performance metal matrix composite parts is realized. Background technique [0002] Particle-reinforced aluminum matrix composites are the most studied and widely used composite materials in the field of composite materials. High volume fraction (>60vol%) SiCp / Al composites have excellent physical and mechanical properties, such as 2 to 3 times the specific strength of titanium alloys, high dimensional stability superior to beryllium materials, and compatibility with steel and titanium The low linear expansion coefficient matched with alloys and even ceramic substrates, the thermal conductivity equivalent to the strength of beryllium materials and silicon carbide ceramics, the yield strength much ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D19/16
Inventor 曲选辉何新波任淑彬叶斌秦明礼
Owner UNIV OF SCI & TECH BEIJING
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