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Preparation method for silicon carbide/aluminium alloy composite material for brake disc

A composite material and silicon carbide technology, applied in the field of brake discs, can solve problems such as poor wear resistance, poor thermal conductivity, and easy thermal cracking, and achieve the effects of easy preparation, low cost, and high specific strength and rigidity

Inactive Publication Date: 2012-10-03
SHANDONG ZHENGNUO GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a method for preparing a silicon carbide / aluminum alloy composite material. As a material for brake discs, it can solve the defects of existing cast iron brake discs such as poor thermal conductivity, poor wear resistance, and easy thermal cracking.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) SiC particle shaping: SiC particles are pulverized by a crusher and classified by a vortex airflow classifier to obtain quasi-circular particles with an average particle size of 25 μm;

[0016] (2), pickling with hydrochloric acid: adding the SiC particles obtained by shaping in step (1) into hydrochloric acid with a mass fraction of 10%, and soaking at 25 ° C for 6 hours, filtering and washing the SiC particles until the pH is 6-7, Reserve after drying;

[0017] (3), high temperature oxidation: the SiC particles obtained by drying in step (2) are oxidized at 900 ° C for 6 hours, and then used after cooling;

[0018] (4) Nitrate sensitization: soak the SiC particles obtained by cooling in step (3) in a magnesium nitrate solution with a mass fraction of 10% for 5 hours, and then titrate the pH of the solution with ammonia water with a mass fraction of 10% within 2 hours. 8-9, filter and dry at 380-400 ℃ for later use.

[0019] (5) Stir casting: First, add magnesium...

Embodiment 2

[0022] (1) SiC particle shaping: SiC particles are pulverized by a crusher and classified by a vortex airflow classifier to obtain quasi-circular particles with an average particle size of 30 μm;

[0023] (2), pickling with hydrochloric acid: adding the SiC particles obtained by shaping in step (1) into hydrochloric acid with a mass fraction of 15%, soaking at 30 ° C for 4 hours, filtering and washing the SiC particles until the pH is 6-7, Reserve after drying;

[0024] (3), high temperature oxidation: the SiC particles obtained by drying in step (2) are oxidized at 950 ° C for 5 hours, and then used after cooling;

[0025] (4) Nitrate sensitization: soak the SiC particles obtained by cooling in step (3) in a magnesium nitrate solution with a mass fraction of 20% for 5 hours, and then titrate the pH of the solution with ammonia water with a mass fraction of 20% within 1 hour. 8-9, filter and dry at 380-400 ℃ for later use.

[0026] (5) Stir casting: First, add magnesium powd...

Embodiment 3

[0029] (1) SiC particle shaping: SiC particles are crushed by a crusher and classified by a vortex airflow classifier to obtain round-shaped particles with an average particle size of 25-35 μm;

[0030] (2), pickling with hydrochloric acid: adding the SiC particles obtained by shaping in step (1) into hydrochloric acid with a mass fraction of 20%, soaking at 25 ° C for 3 hours, filtering and washing the SiC particles until the pH is 6-7, Reserve after drying;

[0031] (3), high temperature oxidation: the SiC particles obtained by drying in step (2) are oxidized at 1000 ° C for 6 hours, and then used after cooling;

[0032] (4) Nitrate sensitization: soak the SiC particles obtained by cooling in step (3) in a magnesium nitrate solution with a mass fraction of 30% for 4 hours, and then titrate the pH of the solution with ammonia water with a mass fraction of 15% within 1-2 hours To 8-9, filter and dry at 380-400 ℃ for use.

[0033] (5) Stir casting: First, add magnesium powder...

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Abstract

The invention relates to the technical field of a brake disc and particularly relates to a preparation method for a silicon carbide / aluminium alloy composite material for a brake disc. The technical scheme of the preparation method is as follows: aluminium casting alloy ZAlSi8MgBe is selected and used as matrix alloy, alpha-SiC particles are selected and used as silicon carbide, and the preparation method comprises the following specific steps of: (1) reshaping of the SiC particles; (2) chlorohydric acid pickling; (3) high-temperature oxidation; (4) nitrate sensitization; (5) stir casting; and (6) T6 thermal treatment. The silicon carbide / aluminium alloy composite material prepared by the invention has the advantages of light weight, high specific strength and specific stiffness, low coefficient of thermal expansion, good thermal conductivity and wear-resistant abrasive resistance, more easiness in preparation and low cost; and the reinforced phases of the silicon carbide / aluminium alloy composite material are dispersively distributed in the matrix and have isotropy so that the silicon carbide / aluminium alloy composite material is suitable for various complex stress states.

Description

technical field [0001] The invention relates to the technical field of brake discs, in particular to a preparation method of a silicon carbide / aluminum alloy composite material for brake discs. Background technique [0002] The brake disc is an important part of the automobile braking system, and its braking performance is directly related to the driving safety of the vehicle. At present, the widely used cast iron brake disc has a surface temperature of up to 600 ℃ due to the heating of braking friction. The working surface temperature is very high and the temperature gradient is large, which is easy to form hot spots and cause thermal cracking, and the wear resistance of cast iron brake discs is poor. . At present, the industry is trying to use aluminum alloy to replace cast iron material for casting brake discs. Although its light weight and good thermal conductivity, its strength and hardness are low, which hinders its application in brake discs. SUMMARY OF THE INVENTI...

Claims

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Application Information

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IPC IPC(8): C22C21/00C22C1/02B22D19/14
Inventor 商好峰刘雨文吴海金
Owner SHANDONG ZHENGNUO GRP
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