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Preparation method of silicon carbide reinforced aluminum base composite material

A composite material and slurry technology, which is applied in the field of preparation of silicon carbide reinforced aluminum matrix composite materials, can solve the problems of SiC reinforcements that are difficult to disperse evenly, and the interface between SiC and Al is difficult to control, so as to avoid segregation and discontinuity , good wettability, and the effect of improving performance

Active Publication Date: 2015-06-24
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to provide a new method for preparing SiC-reinforced Al-based composite materials, aiming at the technical problems that the SiC reinforcement is difficult to disperse uniformly and the SiC-Al two-phase interface is difficult to control in the prior art.

Method used

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  • Preparation method of silicon carbide reinforced aluminum base composite material
  • Preparation method of silicon carbide reinforced aluminum base composite material
  • Preparation method of silicon carbide reinforced aluminum base composite material

Examples

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Embodiment 1

[0029] Step A) milling silicon oxide powder, polyacrylic acid ammonium dispersant and water for 1 hour with a ball milling medium, then adding carboxymethyl cellulose binder, and continuing ball milling for 3 hours to obtain a coating slurry with a solid content of 80wt%; wherein , The mass ratio of alumina powder: dispersant: water: ball milling medium: binder is 1:0.005:0.25:2:0.01.

[0030]Step B) immerse the porous SiC ceramics in the coating slurry, and after fully absorbing the coating slurry, centrifuge at 600 rpm to remove the excess coating slurry, and dry naturally to obtain the porous SiC ceramics coated for the second time.

[0031] Step C) Embed the second-coated mesh porous SiC ceramic into the magnesium-aluminum alloy powder, evacuate to 5Pa, and then raise the temperature to 900°C to melt the magnesium-aluminum alloy powder, and then inject argon until the pressure is 0.6MPa , heat preservation and pressure for 1 hour, and then the SiC / Al composite material was...

Embodiment 2

[0034] Step A) adding alumina powder and sodium polyacrylate dispersant to water, milling with ball milling media for 1 hour, then adding polyvinyl alcohol binder, and continuing ball milling for 3 hours to obtain a coating slurry with a solid content of 70wt%; wherein, The mass ratio of alumina powder: dispersant: water: ball milling medium: binder is 1:0.01:0.4:2:0.02.

[0035] Step B) immerse the mesh porous SiC ceramics in the coating slurry, and after fully absorbing the coating slurry, centrifuge at 500 rpm to remove the excess coating slurry, and dry naturally to obtain the second coated mesh porous SiC ceramics.

[0036] Step C) Embed the secondary coated mesh porous SiC ceramics into the aluminum powder, evacuate to 3pa, and then raise the temperature to 1000°C to melt the aluminum powder, then inject argon gas until the pressure is 0.6MPa, keep the temperature and hold the pressure 1.5 hours, and then the SiC / Al composite material was obtained as the temperature of t...

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Abstract

The invention discloses a preparation method of a SiC / Al composite material. The method comprises the following steps: carrying out ball milling on alumina and / or silicon oxide powder and a dispersant by using a ball milling medium, adding a binder, and continuously carrying out ball milling to obtain a coating slurry, wherein a mass ratio of the powder to the dispersant to water to the ball milling medium to the binder is 1:0.005-0.01:0.1-0.4:2:0.01-0.03; immersing reticulated porous SiC ceramic in the coating slurry for full absorption, centrifuging, and drying; and embedding secondary-coated reticulated porous SiC ceramic into aluminum or aluminum alloy powder, carrying out vacuum pumping heating to fuse the aluminum or aluminum alloy, introducing argon, and carrying out heat insulation and pressure maintenance to obtain the SiC / Al composite material. The SiC / Al composite material obtained through the method is a bicontinuous phase, and the control of an interface structure and an interface reaction is realized through controlling the composition and performances of the coating slurry to realize strong combination between a silicon carbide matrix and the metal Al and uniform continuous distribution in a three dimensional space, so the segregation and the discontinuousness of the silicon carbide reinforcement are avoided, and the performances of the composite material are improved.

Description

technical field [0001] The invention specifically relates to a method for preparing a silicon carbide reinforced aluminum matrix composite material and the obtained silicon carbide reinforced aluminum matrix composite material. Background technique [0002] Silicon carbide reinforced aluminum matrix (SiC / Al) composites are the most researched and applied in metal matrix composites due to their high specific strength, high specific stiffness, low thermal expansion coefficient, good thermal conductivity, good electrical conductivity and wear resistance. One of the most promising materials. Since the 1980s, countries around the world have been competing to carry out research on silicon carbide particle-reinforced aluminum-based (SiCp / Al) composite materials. At present, countries such as Europe and the United States have taken the lead in realizing its application in cutting-edge fields such as aerospace, military affairs, and electronic packaging, and gradually expanded to ci...

Claims

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Application Information

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IPC IPC(8): C22C1/08C22C21/00
Inventor 姚秀敏刘学建黄政仁陈忠明
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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