There are several forms of graphite, what are the characteristics?
2018-06-14
Graphite is made of coke powder and graphite powder (or carbon black), made of bitumen as a binder, and sintered at a high temperature by molding. Depending on the raw materials used and the sintering temperature and time, right inks with different physical and mechanical properties can be made. A type of high-strength graphite, also known as carbon graphite, is characterized by its hard and brittle nature, low thermal conductivity, and difficult processing; the other is graphitized graphite, also known as electrochemical graphite.
Its characteristics are soft, low strength and good self-lubrication. Due to sintering at high temperature during the graphite manufacturing process, the bitumen therein volatilizes to form pores and must be impregnated before use. The impregnated graphite has no obvious effect on the thermal conductivity, but the strength and hardness are significantly improved. In addition to the above-mentioned graphite, there is resin graphite, which is made of synthetic resin as a binder, mixed with the graphite powder uniformly, pressed and formed, and heated up to a resin curing temperature.
The compression force of the graphite packing on the shaft is generated by tightening the gland bolts. Because the filler is an elasto-plastic body, when the axial compression is applied, friction force is generated, so that the pressing force gradually decreases along the axial direction, and the generated radial pressing force causes the filler to closely contact the surface of the shaft and prevent the leakage of the medium.
Graphite packing has good self-lubrication, low coefficient of friction and wear resistance, and temperature resistance. When the friction heat can withstand a certain temperature, easy removal, simple manufacturing, low prices.
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