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Silicon carbide particle reinforcement aluminum-based composite for train brake disc and preparation method

A technology of silicon carbide particles and reinforced aluminum base, applied in the direction of brake discs, brake types, brake components, etc., can solve the problem of poor heat resistance and toughness, easy agglomeration of silicon carbide particles, silicon carbide particles and aluminum alloy phase Poor capacitance and other problems, to achieve strong anti-wear effect

Active Publication Date: 2017-03-22
湖南中南智造新材料协同创新有限公司
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the problems of poor compatibility between silicon carbide particles and aluminum alloys in the prior art, resulting in the easy aggregation of silicon carbide particles, and poor heat resistance and toughness of aluminum-based composite materials, and to provide a Silicon carbide particle reinforced aluminum matrix composite material for train brake disc and preparation method thereof

Method used

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  • Silicon carbide particle reinforcement aluminum-based composite for train brake disc and preparation method

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Embodiment 1～5

[0028] Implementation 1-5: Prepare 1-5# alloys in the table.

[0029] First, the Mg-SiC alloy was prepared semi-solid under vacuum. Melt the magnesium ingot in a vacuum environment. After the magnesium is completely melted, mix 5-10 μm SiC particles into the liquid magnesium matrix. Before adding the silicon carbide particles, start to stir the liquid magnesium slurry. The stirring cannot be stopped during the adding process, and the stirring process needs to be normalized. Stirring and stirring are carried out alternately to ensure that the silicon carbide particles are evenly dispersed and distributed. After the silicon carbide is mixed, stop heating, pour it into the iron mold, and demould after cooling.

[0030] Afterwards, the aluminum-based composite material is melted in a resistance crucible furnace at a melting temperature of 800°C. After pure aluminum is melted, first add Al-Si, Al-Zr, Al-Sc intermediate alloys, then mix (10-25μm) SiC particles into the liquid magne...

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Abstract

Disclosed are a silicon carbide particle reinforcement aluminum-based composite for a train brake disc and a preparation method. The composite includes the following components of, by mass percentage, 15-25% of SiC particles, 18-24% of Si, 0.6-3.5% of Mg, 0.15-0.35% of Zr, 0.12-0.45% of Sc, and the balance Al and unavoidable impurities. According to the preparation method, SiC, Mg, Si, Zr and Sc with the particle size being 10-15 [mu]m are added into molten aluminum in the form of intermediate alloy, SiC with the particle size being 15-25 [mu]m is added into the molten aluminum in the form of particles, and thus the silicon carbide particle reinforcement aluminum-based composite is obtained. The SiC thin particles are added in the form of Mg-SiC, so that the problems of uniform dispersing difficulty of silicon carbide particles in a matrix and poor interface bonding are effectively solved, the particle reinforcement effect is fully played, and the toughness of alloy is improved. Meanwhile, transitional element zirconium and rare earth element scandium are added to replace titanium fine grains, the roughness and heat resistance of the aluminum-based composite are remarkably improved, and occurrence of heat fatigue cracks is restrained. In addition, the added rare earth scandium has a good modification effect on the interfacial compatibility of the silicon carbide particles and aluminum alloy.

Description

technical field [0001] The present invention relates to a silicon carbide particle-reinforced aluminum-based composite material for train brake discs and a preparation method thereof, in particular to a high-strength, heat-resistant and impact-resistant silicon carbide particle-reinforced aluminum-based composite material for train brake discs. The material and the preparation method thereof belong to the field of braking devices for rail transit. Background technique [0002] In the field of rail transportation technology, the material of the brake disc is extremely critical for the effective braking of the locomotive. During emergency braking of high-speed trains, the huge thermal load of the brakes causes a large temperature gradient on the brake discs, which generates thermal stress and may lead to thermal cracks. The material of the brake disc is required to have good thermal fatigue resistance, the friction coefficient of the friction pair under various working condit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22C21/02C22C32/00C22C1/03F16D65/12
CPCC22C1/026C22C1/03C22C21/00C22C21/02C22C32/0063F16D65/125F16D2200/003F16D2250/0007
Inventor 方华婵肖鹏
Owner 湖南中南智造新材料协同创新有限公司
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