Alumina ceramics and steel for ball bearing were tested in a four-ball tester to investigate their properties in seizure and wear. A load range per unit ball of 66 N to 871 N and a sliding velocity range of 0. 095 m/s to 0. 630 m/s were selected. Turbine oil was used as a lubricant in this test. Coefficient of friction of alumina ceramics in seizure increase gradually to 0. 4 with the load, but that of steel increased abruptly to 0. 4 regardless of load. After seizure coefficient of friction of alumina ceramics increased from 0. 1 to 0. 15 with the load, but that of steel remained at 0. 1 independently of the load. Scanning electron microscope observations revealed that the wear mechanism in alumina ceramics was brittle fracture and plastic deformation, but brittle fracture predominated when seizure occurred.
|Number of pages||7|
|Journal||Journal of Japan Society of Lubrication Engineers|
|Publication status||Published - 1986 Jan 1|
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