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Method for preparing selectively enhanced aluminum-based composite from ceramic particles

A composite material and reinforced aluminum-based technology, applied in ceramic products, applications, household appliances, etc., can solve the problem that a single aluminum-based composite material cannot meet the requirements of mechanical properties, thermophysical properties and wear resistance at the same time, and achieve heat dissipation Good performance, excellent wear resistance, and high thermal conductivity

Inactive Publication Date: 2011-10-26
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the preparation of aluminum matrix composites by the liquid phase method is to infiltrate the molten aluminum alloy into the porous ceramic body through the method of pressure infiltration or pressureless infiltration. The single aluminum matrix composite obtained cannot meet the requirements of mechanical properties, thermophysical properties and Requirements for wear resistance

Method used

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  • Method for preparing selectively enhanced aluminum-based composite from ceramic particles
  • Method for preparing selectively enhanced aluminum-based composite from ceramic particles
  • Method for preparing selectively enhanced aluminum-based composite from ceramic particles

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Example 1: Preparation of an aluminum-based composite material with a ceramic phase volume fraction of 35% in the MMC reinforcement

[0026] The powder raw materials are SiC particles with a particle size of 24 μm, polymethyl methacrylate (PMMA) with a particle size of 100 μm, an inorganic binder, and Al with a purity greater than 98%. 2 o 3 , Y 2 o 3 and SiO 2 powder.

[0027] Preparation of porous ceramic body: firstly, Al 2 o 3 , Y 2 o 3 and SiO 2 Al 2 o 3 -Y 2 o 3 -SiO 2 Sintering aids. Then add 10wt.% Al to SiC powder 2 o 3 -Y 2 o 3 -SiO 2 Sintering aid and 3wt.% inorganic binder (sodium silicate) to obtain mixed powder A. Next, 20% by volume of pore-forming agent PMMA was added to mixed powder A to obtain mixed powder B. The mixed powder B was mixed on a ball mill at a speed of 200 rpm for 8 hours. The mixed powder B and the polymer component paraffin-based binder (65wt.% paraffin, 15wt.% high-density polyethylene, 15wt.% polypropylene and 5 we...

Embodiment 2

[0029] Example 2: Preparation of an aluminum-based composite material with a ceramic phase volume fraction of 45% in the MMC reinforcement

[0030] The powder raw materials are SiC particles with a particle size of 40 μm, polymethyl methacrylate (PMMA) with a particle size of 300 μm, an inorganic binder, and Al with a purity greater than 98%. 2 o 3 , Y 2 o 3 and SiO 2 powder.

[0031] Preparation of porous ceramic body: firstly, Al 2 o 3 , Y 2 o 3 and SiO 2 Al 2 o 3 -Y 2 o 3 -SiO 2 Sintering aids. Then add 20wt.% Al in SiC powder 2 o 3 -Y 2 o 3 -SiO 2 Sintering aid and 2wt.% inorganic binder (sodium silicate) to obtain mixed powder A. Next, 10% by volume of pore-forming agent PMMA was added to mixed powder A to obtain mixed powder B. The mixed powder B was mixed on a ball mill at a speed of 250 rpm for 12 hours. Mixed powder B and polymer component paraffin-based binder (60wt.% paraffin, 20wt.% high-density polyethylene, 15wt.% polypropylene and 5 weight ...

Embodiment 3

[0033] Example 3: Preparation of a large-sized aluminum matrix composite material with a ceramic phase volume fraction of 45% in the MMC reinforcement

[0034] The powder raw materials are SiC particles with a particle size of 40 μm, polymethyl methacrylate (PMMA) with a particle size of 300 μm, an inorganic binder, and Al with a purity greater than 98%. 2 o 3 , Y 2 o 3 and SiO 2 powder.

[0035] Preparation of porous ceramic body: firstly, Al 2 o 3 , Y 2 o 3 and SiO 2 Al 2 o 3 -Y 2 o 3 -SiO 2 Sintering aids. Then add 10wt.% Al to SiC powder 2 o 3 -Y 2 o 3 -SiO 2 Sintering aid and 3wt.% inorganic binder to obtain mixed powder A. Next, 30% by volume of pore-forming agent PMMA was added to mixed powder A to obtain mixed powder B. The mixed powder B was mixed on a ball mill at a speed of 250 rpm for 24 hours. Mix acrylamide and N,N'-methylenebisacrylamide at a mass ratio of 24:1, and dissolve them in deionized water at a total mass concentration of 20% to ma...

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Abstract

The invention relates to a method for preparing selectively enhanced aluminum-based composite from ceramic particles and belongs to the field of metal matrix composites (MMCs). The preparation method comprises the following steps: firstly, preparing porous ceramic blanks; and secondly, putting the porous ceramic blanks at a part needing to be enhanced, injecting molten alloy into a mould at 750-1,100 DEG C, applying pressure of 20-50MPa to forcibly fill the molten alloy into the porous ceramic blanks and a mold cavity, and solidifying, thus obtaining the selectively enhanced aluminum-based composite. The method has the advantages that a foaming technology, an injection molding and a gel casting process are combined, thus leading the porous ceramic blank to have designability; the MMC reinforcement and an aluminum matrix are integrally formed by adopting extrusion casting process, thus fully playing the advantages of high strength and high toughness of the aluminum matrix and wear resistance of the MMC reinforcement. The composite has the advantages of high thermal conductivity, good radiation capability, excellent wear resistance and light weight.

Description

technical field [0001] The invention belongs to the research field of metal-matrix composite materials, and particularly provides a method for preparing aluminum-matrix composite materials selectively reinforced by ceramic particles. Background technique [0002] Aluminum matrix composites are widely used in aerospace, aerospace and automotive fields. In some structural parts, composite materials are required to have sufficient strength and stiffness, but also have good thermal conductivity and wear resistance, such as brake drums used on wheels, which must have good comprehensive mechanical properties (high strength and high toughness) to withstand high torque loads, but also have excellent friction and wear properties to achieve the braking function, and also require high thermal conductivity to release a large amount of heat generated by friction. It is difficult for a single aluminum alloy or a single aluminum matrix composite to meet such stringent requirements. Altho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D18/02B22D19/00C22C21/10C04B38/06C04B35/565C04B35/622
Inventor 曲选辉章林何新波任淑彬秦明礼
Owner UNIV OF SCI & TECH BEIJING
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