The friction plate was born with the birth of power machinery and motor vehicles. It can also be said that it is actually an integral part of power machinery and an essential part. But at that time, the performance of the friction plate was far from the current level.
Motor vehicles must use gearboxes and braking devices, which require the use of friction plates. Early friction linings used cotton, cotton cloth, leather, etc. as basic materials, which were then processed into automobile brake pads or brake bands. The disadvantage is poor heat resistance. When the temperature of the friction surface exceeds 120°C, the cotton cloth and cotton cloth will gradually scorch or even burn. With the increase of vehicle speed and load, its braking temperature also rises accordingly. This friction material can no longer meet the requirements of use. Thus was born a new friction material-asbestos friction material.
Early friction plates used materials such as cotton and leather as basic materials. Specifically, a material such as cotton is immersed in a rubber slurry on its surface by immersion, and the rubber slurry is cured on the surface of the fabric, then processed into a shape, and finally a primary friction plate is made. At first, this material is actually satisfactory, but with the improvement of vehicle manufacturing technology, after the vehicle speed and the large load of the vehicle have increased to a certain level, the high temperature generated by friction when the vehicle is running has exceeded this friction material . Therefore, it is necessary to upgrade the friction material.
From the current global technological development, the most successful semi-metal formulation research and application should be in North America. The most successful research and application of low-metal formulations should be in Europe; the most successful research and application of NAO formulations is Japan. Although various formulation systems have their application markets, the major manufacturers are currently focusing on the research and development of ceramic formulations and carbon fiber formulations. The development of the automobile brake industry also tends to be environmentally friendly and low-carbon fields.
Asbestos short fiber and its cloth, belt fabric can be used as the basic material of friction material. Due to its low price, it soon replaced cotton and cotton cloth as the main basic material for friction materials. Asbestos brake tapes were used in 1905, and the friction properties, service life, heat resistance and mechanical strength of their products were greatly improved. Since 1918, people have mixed asbestos short fibers with asphalt to make molded brake pads. Phenolic resins began to be industrialized in the early 1920s. Because their heat resistance is significantly higher than rubber, they soon replaced rubber and became the main adhesive material in friction materials. Since the price of phenolic resin is lower than that of other heat-resistant synthetic resins, since then, asbestos-phenolic friction materials have been widely used worldwide.
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