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Aluminum-matrix composite brake disc

2016-09-22

Hunan Wenchang New Materials Technology Co., Ltd. has successfully developed silicon carbide (SiC) particle-reinforced aluminum matrix composite brake discs for urban rail transit using the principle of metal semi-solid forming technology. These have fully passed the user's bench test assessment and are currently undergoing vehicle installation testing. Based on the successful development experience of rail transit brake discs, the company's R&D team is also developing low-cost SiC particle-reinforced aluminum matrix composite brake discs for automobiles and has already produced samples. After the successful development of this product, it will have broader market application prospects in the automotive field.

SiC particle-reinforced aluminum matrix composites use aluminum alloy as the base material, with a certain amount of SiC particles added to improve the material's wear resistance. The material not only has the high hardness (strength) and wear resistance and low expansion coefficient characteristics of SiC particles, but also the characteristics of low density and good thermal conductivity of aluminum alloy, making it very suitable for manufacturing brake components and wear-resistant parts.

Brake discs made using traditional cast iron and cast steel materials have large braking inertia, rapid disc surface temperature increase, and are prone to thermal fatigue cracking, leading to brake disc failure. Brake discs made of aluminum matrix composites can overcome these shortcomings, and because of the low density of aluminum matrix composites, they can effectively reduce the braking inertia of the brake disc itself to a certain extent. Given the many excellent properties of SiC particle-reinforced aluminum matrix composites, they are currently considered to be the ideal next-generation alternative material for manufacturing brake discs.

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