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China successfully developed silicon carbide ceramic reinforced aluminum matrix composite brake discs Hay:D04HNJT

On December 13, 2021, the "120km/h rail transit vehicle silicon carbide ceramic reinforced aluminum matrix composite brake disc" project developed by HNJT Lightweight Technology Corporation successfully passed the test of the Chinese rail transit authority.

An expert group composed of 7 experts including Huang Boyun, academician of the Chinese Academy of Engineering, Xiao Jiayu, professor of the National University of Defense Technology, reviewed the information, inspected the site, and listened to the report of the project completion unit. For the first time, powder metallurgy technology was used to prepare 120km/h silicon carbide ceramic reinforced aluminum-based composite brake discs for rail transit vehicles, and a complete set of powder metallurgy aluminum-based composite materials were formed in terms of aluminum-based composite component design, forming technology and industrial continuous production. Brake disc production technology, the overall technology of the project is at the international advanced level, and some technologies have reached the international leading level.


High-performance powder metallurgy aluminum-based composite materials help lightweight rail transit equipment


silicon carbide ceramic reinforced aluminum matrix composite brake discs.jpg

As a major rail transit country, as of the first half of 2021, 49 cities in Mainland China have put 8448.67 kilometers of urban rail transit lines into operation. According to CRRC's 2020 annual report, the sales volume of urban rail vehicles exceeds 9,000, and the number of new urban rail vehicles each year will remain stable at about 10,000.


The silicon carbide ceramic reinforced aluminum matrix composite parts with the largest size of 666mm in diameter


The silicon carbide ceramic reinforced aluminum matrix composite parts.jpg


As a key component of rail transit vehicles, brake discs have attracted much attention from the industry for their lightweight. According to relevant data from CRRC, if silicon carbide ceramic reinforced aluminum matrix composite brake discs are used instead of traditional cast iron brake discs, the weight can be reduced by about 60%. This can not only reduce the weight of the vehicle and meet the axle load limit requirements, but also Significantly reduce the energy consumption of subway operation. Related calculations show that a 6-group subway train using silicon carbide ceramic-reinforced aluminum-based composite brake discs can reduce weight by about 2.4 tons, save about 50,000 kilowatt-hours of electricity each year, and reduce carbon dioxide emissions by about 50 tons.

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