A kind of aluminum alloy-alumina composite material and its preparation method and application

A composite material and alumina technology, which is applied in the field of aluminum alloy-alumina composite materials and its preparation, can solve the problems of low manufacturing efficiency of 3D network alumina framework, weak combination of framework and metal matrix, and low sintering yield. Achieve good wave and heat absorption performance, improve production efficiency and yield, and reduce cost

Active Publication Date: 2020-03-13
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the manufacturing efficiency of the 3D network alumina skeleton is low, and multiple times of slurry impregnation are required; the sintering yield is low, and the fired skeleton has more closed cells, resulting in weak bonding between the skeleton and the metal matrix; the hardness of the finished skeleton is too high, resulting in Large friction pair loss

Method used

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  • A kind of aluminum alloy-alumina composite material and its preparation method and application
  • A kind of aluminum alloy-alumina composite material and its preparation method and application
  • A kind of aluminum alloy-alumina composite material and its preparation method and application

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preparation example Construction

[0035] The invention provides a method for preparing an aluminum alloy-alumina composite material, comprising the following steps:

[0036] Mix the dry powder with water to obtain alumina slurry;

[0037] molding the alumina slurry by molding or casting to obtain an alumina billet;

[0038] Sintering and drilling the alumina blank to obtain an alumina skeleton;

[0039] Composite the aluminum oxide skeleton and aluminum alloy melt by impregnation method or die casting method to obtain aluminum alloy-alumina composite material;

[0040] Described dry powder comprises the component of following mass percent:

[0041] Aluminum oxide 75%-30%, magnesium oxide 14-30%, titanium oxide 14-30%, dispersant 1%, polyvinyl alcohol 1%.

[0042] In the present invention, unless otherwise specified, the required preparation materials are commercially available products well known to those skilled in the art.

[0043] The invention mixes dry powder with water to obtain alumina slurry. In t...

Embodiment 1

[0078] Taking 100g dry powder to prepare alumina skeleton as an example

[0079] Uniformly mixing alumina, magnesia and titanium oxide powders according to the mass ratio of 75:14:14, milling in a ball mill for 3 hours to obtain a mixed powder with an average particle size of 6-10 μm;

[0080]Dissolve 1g of sodium carboxymethylcellulose and 1g of polyvinyl alcohol in 40mL of water, heat to 90°C, and dissolve to obtain a mixed solution;

[0081] Mix the mixed solution and the mixed powder, and stir for 1 hour under the condition of 3000r / min to obtain alumina slurry;

[0082] Spray the mold with boron nitride release agent, put the alumina slurry into the mold and pressurize at 5MPa, hold the pressure for 1min, and carry out compression molding to obtain a 200mm×200mm square billet; put the square billet into Put it into an oven for drying, control the temperature rise rate to 3°C / min, raise the temperature to 100°C for 1 hour, and obtain an alumina billet;

[0083] Put the a...

Embodiment 2

[0089] Taking 100g dry powder to prepare alumina skeleton as an example

[0090] Uniformly mixing alumina and kaolin powder according to the mass ratio of 69:29, grinding in a ball mill for 3 hours to obtain a mixed powder with an average particle size of 10-15 μm;

[0091] Dissolve 1g of sodium carboxymethylcellulose and 1g of polyvinyl alcohol in 60mL of water, heat to 90°C, and dissolve to obtain a mixed solution;

[0092] Mix the mixed solution and the mixed powder, and stir for 2 hours under the condition of 3000r / min to obtain alumina slurry;

[0093] Spray the mold with a boron nitride release agent, put the alumina slurry into the mold and pressurize at a pressure of 5 MPa, hold the pressure for 30 minutes, and perform compression molding to obtain a 200mm×200mm square billet. Put the square billet into Put it into an oven for hot air drying, control the temperature rise rate to 3°C / min, raise the temperature to 100°C and keep it for 1h to obtain an alumina billet;

...

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Abstract

The invention belongs to the technical field of composite materials, and particularly relates to an aluminum alloy-aluminum oxide composite material as well as a preparation method and application thereof. An aluminum oxide framework is prepared by adopting a mould pressing method or a tape casting method, the yield of the aluminum oxide framework reaches 95%, and meanwhile, the production efficiency and the yield are improved. The hardness of the prepared aluminum oxide framework reaches HRA 70, when the aluminum alloy-aluminum oxide composite material is used for a brake disc with a frictionpair, the aluminum oxide framework cannot cause serious damage to the friction pair due to excessively high hardness, and the service life of the brake disc and the friction pair is prolonged. The aluminum alloy-aluminum oxide composite material is prepared by combining the good toughness of an aluminum alloy and the heat resistance and wear resistance of aluminum oxide, the wear resistance of the aluminum alloy is improved, and when the aluminum alloy-aluminum oxide composite material is used for the friction pair, the wear amount is less than 30 mg / MJ.

Description

technical field [0001] The invention relates to the technical field of composite material manufacturing, in particular to an aluminum alloy-alumina composite material and a preparation method and application thereof. Background technique [0002] The performance of the brake disc is of great significance to the driving safety of the vehicle. At the same time, it is also necessary to take into account the requirements of the brake disc for light weight, environmental protection and low noise. The traditional cast iron brake disc has poor wear resistance and high quality. Defect, the wet friction coefficient is unstable when driving in rainy days. [0003] In recent years, alumina reinforced aluminum matrix composites have become a research hotspot. Researchers have prepared alumina / metal composites with double-connected structures through die casting, vacuum casting, low pressure casting and other methods. This kind of metal / alumina composite with bi-connected structure use...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/10C04B35/10F16D65/12
CPCC04B35/10C04B2235/3206C04B2235/3232C04B2235/6562C04B2235/661C22C1/1015C22C1/1036F16D65/12
Inventor 何福明喻亮康晓安姜艳丽
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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