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Silicon-aluminum bicontinuous composite material and preparation method thereof

A composite material, bi-continuous technology, applied in the field of preparation of silicon-aluminum composite materials, can solve the problems of bi-continuous composite materials without any reports, and achieve good machinability

Active Publication Date: 2012-07-11
有研金属复材技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, there is no report on the above-mentioned powder metallurgy preparation process of bicontinuous composite materials

Method used

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  • Silicon-aluminum bicontinuous composite material and preparation method thereof
  • Silicon-aluminum bicontinuous composite material and preparation method thereof
  • Silicon-aluminum bicontinuous composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0043] The bicontinuous composite material prepared in this embodiment is 65vol.%Si / Al, that is, the content of silicon is 65vol.%; the content of aluminum alloy is 35vol.%, and the composition of aluminum alloy is Al-4.5Cu-0.5Mg (4.5 and 0.5 Indicates that the mass fractions of copper and magnesium are 4.5% and 0.5%, respectively). Its preparation method adopts following technical scheme:

[0044] (1) Pure aluminum powder, pure copper powder and pure magnesium powder account for 4.5wt.% and 0.5wt.% of the mass fraction of mixed powder according to pure copper powder and pure magnesium powder and evenly mix and make aluminum-copper-magnesium mixed powder, then The aluminum-copper-magnesium mixed powder and the surface-treated silicon powder are evenly mixed according to the mass ratio of 1:1.57 to prepare the aluminum-copper-magnesium-silicon mixed powder, so that the volume fraction of silicon is 65 vol.%. The average particle size of pure aluminum powder, pure copper powder...

Embodiment 2

[0056] The bicontinuous composite material prepared in this embodiment is 75vol.% Si / Al, that is, the silicon content is 75vol.%; the aluminum alloy content is 25vol.%, and the aluminum alloy composition is Al-4.5Cu. Its preparation method adopts following technical scheme:

[0057] (1) Pure aluminum powder and pure copper powder are uniformly mixed according to the mass fraction of pure copper powder accounting for 4.5wt.% of the mixed powder to make aluminum-copper mixed powder, and then the aluminum-copper mixed powder and the silicon powder after surface treatment are mixed according to the mass ratio Mix 1:2.5 evenly to make aluminum-copper-silicon mixed powder, so that the volume fraction of silicon is 75vol.%. Due to the increase of the silicon content, in order to enable the silicon powder to be uniformly dispersed in the aluminum-copper mixed powder, the particle size of the silicon powder is increased. The average particle sizes of the silicon powder, pure aluminum p...

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Abstract

The invention relates to a bicontinuous composite material which has excellent comprehensive properties due to the special interpenetrating network structure. Aiming at the silicon aluminum material having wide application prospects, the invention implements a silicon-aluminum bicontinuous composite material and a powder metallurgy preparation technique thereof. The technique overcomes the defects of overgrowth of silicon, and material nonuniformity and noncompactness in the casting method and liquid phase impregnation method, and prepares the bicontinuous composite material with controllable composition, phase dimensions and microstructure. The invention implements uniform mixing of the two phases silicon and aluminum by selecting reasonable composition and powder size; and the alloy elements of the aluminum alloy are added by an element powder direct mixing method. The billet is completely compacted within a proper temperature range; and silicon atoms are diffused, so that the silicon powder particles are connected with each other and interpenetrate with the aluminum alloy to form the bicontinuous composite material. The silicon content in the composite material is 40-80 vol.%; and the composite material is completely compact and has a uniform structure. The composite material has excellent comprehensive properties, and is applicable to various conventional machining means.

Description

technical field [0001] The invention relates to the technical field of preparation of aluminum-based composite materials; in particular, it relates to a preparation process of a silicon-aluminum composite material with a double continuous phase structure. Background technique [0002] Aluminum matrix composites have high specific strength, high specific stiffness, good fatigue performance, wear resistance, low thermal expansion and other performance characteristics, and its comprehensive performance is significantly better than the corresponding matrix aluminum alloy, so it is used in aerospace, electronic information, transportation vehicles, etc. important areas. Aluminum matrix composites mostly use silicon carbide, alumina, boron carbide and other particles or whiskers, or graphite fibers, boron fibers, etc. as reinforcement materials. The preparation technology of aluminum matrix composites can be roughly divided into two categories: casting method and powder metallurg...

Claims

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Application Information

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IPC IPC(8): C22C21/02C22C30/02C22C1/05
Inventor 刘彦强樊建中马自力魏少华左涛
Owner 有研金属复材技术有限公司
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