Method for preparing aluminum matrix composite through high pressure solidification after semi-solid mechanical stirring

An aluminum-based composite material and mechanical stirring technology, which is applied in the field of preparing aluminum-based composite materials, can solve the problems of harmful reinforcement and metal, and achieve the effects of uniform distribution and high nucleation rate.

Active Publication Date: 2015-01-28
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention is to solve the problem that the reinforcement body needs to be evenly distributed in the matrix metal in the stirring casting method, and in addition, it is necessary to avoid the harmful reaction between the reinforcement body and the metal at high temperature, and to reduce the casting defects generated during the solidification process

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  • Method for preparing aluminum matrix composite through high pressure solidification after semi-solid mechanical stirring
  • Method for preparing aluminum matrix composite through high pressure solidification after semi-solid mechanical stirring
  • Method for preparing aluminum matrix composite through high pressure solidification after semi-solid mechanical stirring

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specific Embodiment approach 1

[0026] Specific Embodiment 1: In this embodiment, the method for preparing aluminum-based composite materials by high-pressure solidification after semi-solid mechanical stirring is specifically prepared according to the following steps:

[0027] 1. Soak SiC particles in HF solution with a mass concentration of 4%~10%. The soaking time is 24h~72h. During this period, mechanically stir for 20min~40min every 5h~6h. When the pH reaches 6.8~7.2, SiC slurry is obtained, wherein the volume ratio of the mass of SiC particles to the HF solution is 9g~11g:45mL;

[0028] 2. Keep the SiC slurry obtained in step 1 at a temperature of 92°C~98°C for 8h~9h, and then at a temperature of 240°C~260°C for 8h~9h, and then use a 500-mesh sieve for sieving. Then keep warm at 600℃~700℃ for 1h~2h to obtain reinforcement particles;

[0029] 3. Put the clean aluminum alloy into the crucible, and pass through the argon gas with a flow rate of 100mL / min~200mL / min, raise the temperature to 700℃~750℃ to o...

specific Embodiment approach 2

[0034] Embodiment 2: This embodiment differs from Embodiment 1 in that: in step 1, the particle size of the SiC particles is 5 μm˜50 μm. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0035] Specific embodiment 3: The difference between this embodiment and specific embodiment 1 or 2 is: soak in step 1 for 30h~70h. Others are the same as in the first or second embodiment.

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Abstract

The invention provides a method for preparing an aluminum matrix composite through high pressure solidification after semi-solid mechanical stirring and relates to a method for preparing the aluminum matrix composite. The method provided by invention aims to solve the problems of the stirring casting method of needing to evenly distribute reinforcements in the matrix metal, and needing to avoid harmful reaction between the reinforcements and the metal at high temperatures, and reducing the casting shortcomings generated in the solidification process. The method comprises the following steps of: 1, preparing SiC slurry; 2, preparing reinforcement particles; 3, preparing alumium alloy melt; 4, preparing compound slurry; 5, increasing the temperature and stirring; and 6, obtaining the alumium matrix composite. The method provided by the invention avoids harmful reaction between the reinforcements and the matrix metal and the formation of casting shortcomings, and also avoids harmful reaction between the reinforcements and the matrix metal at a high temperature in full liquid state. The method is used for preparing the alumium matrix composite.

Description

technical field [0001] The present invention relates to a method for preparing an aluminum matrix composite material. Background technique [0002] Compared with metals, metal matrix composites have excellent properties such as high specific strength, specific stiffness, wear resistance, low thermal expansion coefficient, good thermal conductivity and dimensional stability. Silicon carbide particles reinforced aluminum matrix composites are a typical representative of metal matrix composites. Compared with other reinforcements, SiC particles have a lower preparation cost, which makes composite materials have a good low-cost advantage. This composite material can be used as aerospace bearing materials, heat dissipation and packaging materials for electronic components, and automotive brake disc materials. The preparation methods of this composite material mainly include solid-phase method (powder metallurgy method, etc.) and liquid-phase method (squeeze casting method, spray...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/10B22D18/02
Inventor 张学习刘明坤王晓军郭永良耿林
Owner HARBIN INST OF TECH
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