An investigation of the basic factors involved in the wear and friction of ceramics, cer¬mets, and high-temperature alloys sliding at speeds of 100 to 200 fps and temperatures from 500 to 1000 C (1000 F to 1800 F) has been made. Bearing pressures covered a range of 5 to 50 psi. Statistical correlation of measured wear rates with friction and material properties indicates that, at these temperatures, the wear rate of ceramics and cermets may be approxi¬mately described by the following relationship: where μ is the coefficient of friction, R is the thermal-stress-resistance factor, and D is the thermal diffusivity of the mated material on which wear predominates, which is usually the material with the lowest thermal-stress resistance.
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