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Method for preparing silicon carbide particle reinforced aluminum-based composites

A silicon carbide particle-reinforced aluminum-based technology, which is applied in the field of preparing silicon carbide particle-reinforced aluminum-based composite materials, can solve the problems of weakening the comprehensive performance of the composite material, making it difficult for the composite material to penetrate completely, and the density is difficult to achieve complete uniformity. Openness, low cost, no segregation effect

Inactive Publication Date: 2012-08-08
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the poor wettability of SiCp particles and Al matrix, it is difficult to achieve idealized complete penetration of the prepared composite material. The compactness of the composite material is poor, and the density is difficult to achieve complete uniformity. It is difficult to eliminate the micropores inside the composite material. Defects such as harmful inclusions and large internal stress greatly weaken the good comprehensive performance of the composite material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: Preparation of silicon carbide particle-reinforced aluminum-based composite material with SiC particle volume fraction of 50%

[0019] Use silicon carbide powder with a particle size of 70# and 180# respectively, and mix them at a volume ratio of 1:1. According to the volume of silicon carbide, according to the volume ratio of silicon carbide: binder: pore-forming agent 8:3:2, the added The binder is sodium stearate, the pore-forming agent is starch, put it into a mixer, and stir for 1.5 hours at a temperature of 80-100°C to obtain uniform silicon carbide mixed particles, put it into a mold of a press, and grind it at 50-100°C Under the pressure of 200MP, control and calculate the volume of the preform. After the free impregnation of the aluminum liquid, the volume fraction of the aluminum matrix is ​​50%. Press the preform of the desired shape and dry it in a drying room at 80-120°C. . Put the pressed silicon carbide particle preform in an atmospheric atmos...

Embodiment 2

[0020] Example 2: Preparation of silicon carbide particle-reinforced aluminum-based composite material with SiC particle volume fraction of 60%

[0021] Use silicon carbide powder with a particle size of 70# and 150# respectively, and mix them at a volume ratio of 1:2. According to the volume of silicon carbide, according to the volume ratio of silicon carbide: binder: pore-forming agent 7:2:3, add The binder is paraffin, and the pore-forming agent is stearic acid. Put it into a mixer and stir for 2.0 hours at a temperature of 80-100°C to obtain uniform silicon carbide mixed particles. Under the pressure of 200MP, control and calculate the volume of the preform. After free impregnation of the aluminum liquid, the volume fraction of the aluminum matrix is ​​40%. Press the preform of the required shape and dry it in a drying room at 80-120°C. . Put the pressed silicon carbide particle preform in an atmospheric atmosphere furnace, heat it up to 350°C with the furnace at a heatin...

Embodiment 3

[0022] Example 3: Preparation of silicon carbide particle-reinforced aluminum-based composite material with SiC particle volume fraction of 45%

[0023] Use silicon carbide powder with a particle size of 100# and 150# respectively, and mix them at a volume ratio of 2:1. According to the volume of silicon carbide, according to the volume ratio of silicon carbide: binder: pore-forming agent 9:4:2, the added The binder is silica sol, and the pore-forming agent is graphite. Put it into a mixer and stir for 1.2 hours at a temperature of 80-100°C to obtain uniform silicon carbide mixed particles. Under pressure, control and calculate the volume of the preform. After free impregnation with aluminum liquid, the volume fraction of the aluminum matrix is ​​55%. Press the preform of the required shape and dry it in a drying room at 80-120°C. Place the pressed silicon carbide particle preform in an atmospheric atmosphere furnace, heat it up to 400°C with the furnace at a heating rate of 3...

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Abstract

The invention discloses a method for preparing silicon carbide particle reinforced aluminum-based composites. The method comprises the steps: (a) using silicon carbide particles (SiCp) of different particle diameters according to a volume ratio of 1:1-2:1 to obtain mixed silicon carbide particles, adding the mixed silicon carbide particles to a mixer and stirring for 1-3.5 hours; (b) adding binder and pore-forming agent to the silicon carbide particle mixtures of different particle diameters, uniformly stirring; (c) delivering the silicon carbide particles on a press to obtain preforms by pressing, drying and preserving the preforms at a temperature of 80-120 DEG C; (d) pre-sinttering the SiCp mixture performs to obtain SiCp blanks; (e) removing impurities of the SiCp blanks, carrying out preoxidation for 1-2.5 hours at constant temperature of 1000-1100 DEG C; and (f) changing aluminum alloy in such a way: placing aluminum matrix material and the SiCp blanks together, adopting a free-infiltration method and maintaining the temperature for 2-4 hours to obtain the silicon carbide particle reinforced aluminum matrix composites. The preparation technology in the invention is simple, with a low cost and is easy to be realized.

Description

technical field [0001] The invention relates to a method for preparing silicon carbide particle-reinforced aluminum-based composite materials. Background technique [0002] Silicon carbide particle reinforced aluminum matrix (SiCp / Al) composite material has excellent comprehensive properties such as high strength, high modulus, high thermal conductivity, low thermal expansion coefficient, light weight, and high cost performance. It is used in aerospace, optics, electronic packaging, sports Equipment and other fields have broad application prospects. Its main feature is that it can obtain ideal comprehensive performance by adjusting the content of SiC particles. For example, it is used abroad to replace beryllium, titanium and glass to make light mirror substrates, gyro brackets, inertial platforms, etc., on displays, electronic counting and measurement arrays. Packaging and heat sink components, tank fire control systems, infrared detection systems, space-based laser syste...

Claims

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Application Information

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IPC IPC(8): C22C29/06C22C21/00C22C32/00C22C1/04B22D19/14
Inventor 周贤良李多生邹爱华华小珍张建云俞应炜
Owner NANCHANG HANGKONG UNIVERSITY
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