Silicon carbide reinforced aluminum-based composite material and preparation method thereof

A composite material and reinforced aluminum-based technology, which is applied in the field of inorganic composite materials, can solve the problems of reducing the service life of the mold, growing silicon particles, and long heat preservation time, etc.

Active Publication Date: 2012-09-19
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this process is concentrated in the mold, high temperature and pressure will reduce the service life of the mold, and has higher requirements on the material and structure of the mold
At the same time, the mold material is different, the specific heat capacity of the mold is different from the heat storage, the heating rate during the preparation process, and the holding time affect the uniformity of the mold temperature and the uniformity of the composite material structure; if the holding time is too long or the heating temperature is too high, the precipitation in the composite material structure The silicon particles in the composite material grew seriously, and at the same time, part of the metal aluminum was precipitated to the surface of the compact; the holding time was insufficient or the heating temperature was too low, and the metallurgical bonding between the reinforcement particles and the aluminum matrix in the composite material could not be formed; the pressing pressure had a negative impact on the composite compact Density and internal stress have great influence; cooling rate and pressure directly affect the safe release of internal stress and the formation of crack defects in composite materials

Method used

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  • Silicon carbide reinforced aluminum-based composite material and preparation method thereof
  • Silicon carbide reinforced aluminum-based composite material and preparation method thereof
  • Silicon carbide reinforced aluminum-based composite material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0027] The silicon carbide reinforced aluminum matrix composite material (SiCp / Al-30Si composite material) of this embodiment is compounded by SiC powder with a particle size of 325 mesh and Al-30Si alloy powder with a particle size of 500 mesh, and the volume fraction of silicon carbide powder is 20%. The amount is Al-30Si alloy powder.

[0028] The composite material of this embodiment is prepared in a vacuum brazing machine, and the steps are as follows:

[0029] 1) Mixing is performed on a planetary ball mill to obtain a mixed powder, wherein the ball-to-material ratio is 1:1, and the mixing time is 2 hours;

[0030] 2. Coat the inner surface of the mold cavity of the heat-resistant mold steel sintering mold with a release agent (75wt% graphite + 25wt% machine oil), put the mixed powder into the mold, put the mold into the vacuum brazing machine, and turn on the equipment. Vacuumize to 0.02Pa, and pre-press the mixed powder in the mold with a pressure of 40MPa;

[0031] ...

Embodiment 2

[0036] The silicon carbide reinforced aluminum matrix composite material (SiCp / Al-30Si composite material) of this embodiment is made of SiC powder with a particle size of 325 mesh and Al-30Si alloy powder with a particle size of 500 mesh. The volume fraction of silicon carbide powder is 23%. The amount is Al-30Si alloy powder.

[0037] The composite material of this embodiment is prepared in a vacuum brazing machine, and the steps are as follows:

[0038] 1. Perform mixing on a planetary ball mill to obtain mixed powder, wherein the ball-to-material ratio is 1:1, and the mixing time is 2.5 hours;

[0039] 2. Coat the inner surface of the mold cavity of the heat-resistant mold steel sintering mold with a release agent (75wt% graphite+25wt% machine oil), put the mixed powder into the mold, and put the mold into a vacuum brazing machine. Turn on the equipment, evacuate to 0.02Pa, and pre-press the mixed powder in the mold with a pressure of 40MPa;

[0040]3. Heat the mold in t...

Embodiment 3

[0045] The silicon carbide reinforced aluminum matrix composite material (SiCp / Al-30Si composite material) of this embodiment is made of SiC powder with a particle size of 325 mesh and Al-30Si alloy powder with a particle size of 500 mesh. The volume fraction of silicon carbide powder is 25%. The amount is Al-30Si alloy powder.

[0046] The composite material of this embodiment is prepared in a vacuum brazing machine, and the steps are as follows:

[0047] 1. Perform mixing on a planetary ball mill to obtain mixed powder, wherein the ball-to-material ratio is 1:1, and the mixing time is 3 hours;

[0048] 2. Coat the inner surface of the mold cavity of the heat-resistant mold steel sintering mold with a release agent (75wt% graphite+25wt% machine oil), put the mixed powder into the mold, and put the mold into a vacuum brazing machine. Turn on the equipment, evacuate to 0.01Pa, and pre-press the mixed powder in the mold with a pressure of 40MPa.

[0049] 3. Heat the mold in th...

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Abstract

The invention discloses a silicon carbide reinforced aluminum-based composite material and a preparation method thereof. The silicon carbide reinforced aluminum-based composite material is prepared from the following raw materials in percentage by volume: 20 to 25 percent of 325-mesh silicon carbide powder and the balance of 500-mesh Al-30Si alloy powder. According to the silicon carbide reinforced aluminum-based composite material, the silicon carbide powder and the Al-30Si alloy powder which have properly matched particle sizes are easily combined closely in the pressing and sintering process, defects such as air holes and cracks are avoided and the compactness of the composite material can be improved. In addition, by the preparation method of heating, pressurizing and keeping temperature stepwise according to set programs under the vacuum condition, slowly cooling together with a furnace to room temperature under the vacuum and high pressure conditions and removing the pressure, the metallurgical bonding of the reinforcement and the matrix is further improved, the defects such as air holes and cracks are avoided and the performance is high.

Description

technical field [0001] The invention relates to a silicon carbide-reinforced aluminum-based composite material and a method for preparing the composite material, belonging to the technical field of inorganic composite materials. Background technique [0002] In recent years, silicon carbide particle reinforced aluminum matrix composites have been gradually recognized by the aerospace industry for their unique low expansion, high specific strength, high specific modulus, high wear resistance and other excellent properties. At the same time, they are used in automobile pistons and It is also widely used in the fields of braking system and so on. [0003] A high volume fraction of silicon carbide particles reinforced aluminum matrix composites is difficult to densify. Density is an important factor determining the mechanical properties of materials. How to improve the density of materials is a very critical issue in the preparation of composite materials. The existing prepar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22C1/05C22C1/10
Inventor 王爱琴谢敬佩孙浩亮李继文王文焱李洛利
Owner HENAN UNIV OF SCI & TECH
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