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A method for preparing metal matrix composites with controllable volume fraction and highly dispersed particles

A particle-enhanced, volume-fraction technology, applied in metal material coating process, metal processing equipment, transportation and packaging, etc., can solve the problems of unevenness, high cost, low cost of discontinuous reinforcing agent, etc., achieve uniform distribution, prevent The effect of pollution

Active Publication Date: 2020-06-09
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Composite materials used in aerospace and aviation fields usually use continuous fiber reinforced high specific strength metal matrix composites, which have excellent performance, but the cost is high and the process is complicated. People are more interested in high temperature and corrosion resistant metal matrix composites for industrial applications. It is a composite material reinforced and toughened by a discontinuous reinforcing agent. This is because on the one hand, the cost of the discontinuous reinforcing agent is low, and on the other hand, the preparation process of the metal matrix composite material reinforced by the discontinuous reinforcing agent is simple. Generally speaking, metal matrix composites reinforced by discontinuous reinforcing agents are prepared by traditional powder metallurgy technology, that is, the metal tomb and reinforcing agent are uniformly mixed and densely prepared by liquid phase sintering to prepare composite materials. During the mixing process The inhomogeneity, on the one hand, will weaken the reinforcement particles, whiskers and the interface of the metal tomb, on the other hand, it will affect the sinterability and material properties
Therefore, the key issues in the preparation of discontinuous reinforcing agent-reinforced metal tomb composites are the interface compatibility between the reinforcing agent and the matrix, and the dispersion uniformity of the ceramic reinforcing agent in the metal matrix.

Method used

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  • A method for preparing metal matrix composites with controllable volume fraction and highly dispersed particles
  • A method for preparing metal matrix composites with controllable volume fraction and highly dispersed particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] SiC particles with a particle size of 20 μm are selected, and the method of physical vapor deposition is used to continuously vibrate and change the direction of the particles through the stirring method or vibration method. Using aluminum alloy target material, deposition temperature is 200°C, pressure is 0.8Pa, bias voltage is -100V, deposition rate is 10μm / h, deposition time is 5h, thickness of deposited aluminum alloy is 50μm, put the wrapped particles into the mold, and adopt vacuum hot pressing , the molding temperature is 500℃, the pressure is 80MPa, and the holding time is 5h, and the SiC particle-reinforced aluminum matrix composite material with a volume fraction of 2.7% is prepared.

Embodiment 2

[0038] Select SiC particles with a particle size of 100 μm, use the physical vapor deposition method, and use the stirring method or vibration method to continuously vibrate and change the direction of the particles, choose TiC as the target material, and inject Ar gas and CH 4 Gas, the ratio of the two is 60:15, the deposition temperature is 300°C, the pressure is 0.5Pa, the bias voltage is -300V, the deposition rate is 0.5μm / h, the deposition time is 4h, and the TiC coating of 2μm is deposited; TC17 titanium alloy is selected as the target material , the deposition temperature is 600°C, the pressure is 0.8Pa, the bias voltage is -200V, the deposition rate is 7.5μm / h, the deposition time is 4h, and the thickness of the deposited TC17 alloy is 30μm. 900 ℃, pressure 120MPa, heat preservation and pressure holding time 2h, SiC particle reinforced TC17 matrix composite material with a volume fraction of 39% was prepared.

Embodiment 3

[0040] Select SiC particles with a particle size of 50 μm, use the physical vapor deposition method, and use the stirring method or vibration method to continuously vibrate and change the direction of the particles, choose TiC as the target material, and inject Ar gas and CH 4 Gas, the ratio of the two is 60:2, the deposition temperature is 250°C, the pressure is 1Pa, the bias voltage is -400V, the deposition rate is 0.6μm / h, the deposition time is 2h, and the TiC coating of 1.2μm is deposited; TiAl alloy is selected as the target material. The deposition temperature is 600°C, the pressure is 0.8Pa, the bias voltage is -400V, the deposition rate is 10μm / h, the deposition time is 1h, the thickness of the deposited TiAl alloy is 10μm, the wrapped particles are put into the mold, and the forming temperature is 980°C. The pressure was 60MPa, and the holding time was 2h, and the SiC particle reinforced TiAl-based composite material with a volume fraction of 51% was prepared.

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Abstract

The present invention is a method for preparing a metal matrix composite material with controllable volume fraction and highly dispersed particles. The manufacturing steps are as follows: put particles with a certain particle size distribution into physical vapor deposition equipment, and evenly coat the surface of the particles with an interface barrier layer ; Then continue to uniformly coat the metal coating on the surface of the particles to form a metal-wrapped particle structure; put the wrapped particles into the mold, and realize particle-reinforced metal matrix composites through vacuum hot pressing, hot isostatic pressing or SPS forming processes preparation. Thus, a particle-reinforced metal matrix composite with controllable volume fraction and high dispersion is obtained. The invention can effectively ensure the preparation of high volume fraction composite materials; at the same time, the metal coating evenly wraps the particles, which can effectively ensure that the particles will not contact during the molding process, ensure the uniform distribution of the reinforcing phase, and help realize high-performance particles Fabrication of reinforced metal matrix composites.

Description

technical field [0001] The invention belongs to the research field of metal-matrix composite materials, and particularly provides a method for preparing metal-matrix composite materials with controllable volume fraction and highly dispersed particles. This preparation method can prepare high-performance metal matrix composite materials. Background technique [0002] SiC particle reinforced metal matrix composites can combine the respective advantages of metal and SiC, and can simultaneously have excellent structural load-bearing function, excellent thermal control function and unique anti-resonance function. Utilizing the good bearing capacity of SiC and the excellent properties of high temperature resistance, corrosion resistance, wear resistance, high strength and high toughness of composite materials, it is widely used in aerospace, chemical industry, machinery and other fields. It combines metal plasticity, toughness and ceramics. The material has the advantages of high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02C23C14/06C23C14/18C23C14/22C23C14/08
CPCC23C14/0021C23C14/0635C23C14/083C23C14/18C23C14/223B22F2998/10B22F1/17B22F3/14B22F3/15B22F2003/1051
Inventor 黄浩王敏涓李虎黄旭沙爱学李臻熙
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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