Recently, it was introduced by the Shehong County Bureau of Science and Technology. Sichuan Tianlian Automobile & Trade Co., Ltd., a strategic supplier of Dongfeng Motor Co., Ltd., a state-owned company, signed an investment agreement with the Shehong County Government on the Dongfeng Commercial Vehicle Parts Production Base project. The central government settled on the flood.
The total investment of the Dongfeng Commercial Vehicle Parts Production Base project is 200 million yuan. The site is located in Hongcheng New District. Within 10 months, the factory will be built and the production equipment will be in place. The production will be put into production within one year. The project will mainly build forging, heat treatment, finishing, carbide and other production lines, production of gearbox, engine and other commercial auto parts, is expected to achieve an annual output value of 10 billion yuan, profits and taxes of 50 million yuan.
Asbestos was added as an common ingredient to Brake Pads post-WWI, as car speeds began to increase, because research showed that its properties allowed it to absorb the heat (which can reach 500 °F) while still providing the friction necessary to stop a vehicle. However, as the serious health-related hazards of asbestos eventually started to become apparent, other materials had to be found. Asbestos brake pads have largely been replaced by non-asbestos organic (NAO) materials in first world countries. Today, brake pad materials are classified into one of four principal categories, as follows:
Non-metallic materials - these are made from a combination of various synthetic substances bonded into a composite, principally in the form of cellulose, aramid, PAN, and sintered glass. They are gentle on rotors, but produce a fair amount of dust, thus having a short service life.
Semi-metallic materials - synthetics mixed with varying proportions of flaked metals. These are harder than non-metallic pads, more fade-resistant and longer lasting, but at the cost of increased wear to the rotor/drum which then must be replaced sooner. They also require more actuating force than non-metallic pads in order to generate braking torque.
Fully metallic materials - these pads are used only in racing vehicles, and are composed of sintered steel without any synthetic additives. They are very long-lasting, but require more force to slow a vehicle while wearing off the rotors faster. They also tend to be very loud.
Ceramic materials - Composed of clay and porcelain bonded to copper flakes and filaments, these are a good compromise between the durability of the metal pads, grip and fade resistance of the synthetic variety. Their principal drawback, however, is that unlike the previous three types, despite the presence of the copper (which has a high thermal conductivity), ceramic pads generally do not dissipate heat well, which can eventually cause the pads or other components of the braking system to warp.However, because the ceramic materials causes the braking sound to be elevated beyond that of human hearing, they are exceptionally quiet.
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