Low-heat-expansion high-intensity alumina-silicon-aluminum (AlN-Si-Al) mixed composite material and preparation method thereof

A technology of low thermal expansion and composite materials, which is applied in the field of AlN-Si-Al hybrid composite materials and their preparation, hybrid composite materials and their preparation, and can solve the problems of metal aluminum non-wetting, difficulty, and poor powder sintering performance. Achieve the effects of promoting rearrangement, realizing engineering production, and high-strength machining process performance

Active Publication Date: 2013-06-19
有研金属复材技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a reinforcing material, AlN is better than Si in enhancing toughness and reducing thermal expansion of aluminum-based materials. However, AlN is a covalent bond compound, has poor powder sintering performance, and is not wetted with metal aluminum. AlN / Al with high AlN content Composite materials are more difficult

Method used

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  • Low-heat-expansion high-intensity alumina-silicon-aluminum (AlN-Si-Al) mixed composite material and preparation method thereof
  • Low-heat-expansion high-intensity alumina-silicon-aluminum (AlN-Si-Al) mixed composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] The hybrid composite material prepared in this example is 10wt.% AlN-40wt.% Si-Al, that is, the content of AlN is 10wt.%, the content of Si is 40wt.% Si, and the content of Al is 50wt.%. Its preparation method adopts following technical scheme:

[0040] The pure Al powder, AlN powder and Si powder are uniformly mixed in a conical mixing tank according to the mass ratio of the three powders of 5:1:4 to form AlN-Si-Al mixed powder. For the particle dispersion characteristics of the mixed powder, see figure 1 Shown, so that the mass fraction of AlN is 10wt.%, the mass fraction of Si is 40wt.%, adopts φ 5mm stainless steel ball as the powder mixing medium, the ball material ratio is 1: 1, and the powder mixing time is 14 hours; The average particle size of pure Al powder, AlN powder and Si powder (d0.5, that is, more than 50wt.% of the powder particle size is smaller than this size) is 8.5 μm, 9 μm, and 15 μm respectively; the size of the mixed powder is φ90mm×260mm Cold i...

Embodiment 2

[0043] The hybrid composite material prepared in this example is 25wt.% AlN-45wt.% Si-Al, that is, the content of AlN is 25wt.%, the content of Si is 45wt.% Si, and the content of Al is 30wt.%. Its preparation method adopts following technical scheme:

[0044] Pure Al powder, AlN powder and Si powder were uniformly mixed in a conical mixing tank according to the mass ratio of the three powders of 1.2:1:1.8 to form AlN-Si-Al mixed powder (for the particle dispersion characteristics of the mixed powder, see figure 2 Shown), so that the massfraction of AlN is 25wt.%, the massfraction of Si is 45wt.%, adopts φ5mm stainless steel ball as the powder mixing medium, the ball material ratio is 1: 1, and the powder mixing time is 20 hours; The average particle sizes of pure Al powder, AlN powder and Si powder are 3 μm, 4.5 μm and 9 μm respectively; the mixed powder is put into a rubber sheath with a size of φ84mm×260mm and cold isostatically pressed to form at a pressure of 200MPa. Af...

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Abstract

The invention relates to a low-heat-expansion high-intensity alumina-silicon-aluminum (AlN-Si-Al) mixed composite material and a preparation method thereof. The AlN-Si-Al mixed composite material comprises 10wt% to 25wt% of AlN, 40 wt% to 45 wt% of Si and 30 wt% to 50 wt% of Al, wherein the AlN and the Si are used as reinforcing materials and distributed in a continuous aluminum substrate in the form of particles in a dispersive mode, so that a reinforced aluminium base composite material mixed with AlN particles and Si particles is formed. The AlN-Si-Al mixed composite material is prepared by adoption of a powder metallurgy preparation process. The low-heat-expansion high-intensity AlN-Si-Al mixed composite material has low heat expansion and high intensity. The composite material is uniform in microstructure, completely compact and of a good machining process performance. The AlN-Si-Al mixed composite material is expected to be a substitute material of a high-silicon-content Si / Al packaging material and a substitute material of high-silicon-carbide (SiC)-content SiC / Al packaging material.

Description

technical field [0001] The invention relates to a hybrid composite material containing aluminum, silicon and aluminum nitride and its preparation method, in particular to an AlN-Si-Al hybrid composite material with low thermal expansion and high strength and its preparation method, belonging to the metal matrix composite field of materials technology. Background technique [0002] Aluminum matrix composites have comprehensive performance advantages such as high specific strength, high specific stiffness, high thermal conductivity, and adjustable thermal expansion coefficient, so they have gained important applications in the fields of aerospace, microelectronics, and transportation. Most of the aluminum matrix composites use silicon carbide, aluminum oxide, silicon, aluminum nitride, boron carbide and other particles or whiskers, as well as fibers, etc. as reinforcement materials. Among them, silicon is an ideal reinforcement material with light weight, low thermal expansio...

Claims

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Application Information

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IPC IPC(8): C22C21/02C22C30/00C22C32/00C22C1/05
Inventor 刘彦强魏少华樊建中马自力左涛
Owner 有研金属复材技术有限公司
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