Estimation of friction and wear properties was attempted using the AE count rate in wear tests for three kinds of metal pins rubbed on four kinds of ceramic disks under unlubricated and lubricated (oleic acid) conditions. The relationships between the AE count rates emanating from the end of the pins and the specific wear rate, the topographies of micro-roughness of the wear surfaces, and the mode of wear were established. As a result, we found that the sum of the wear rates for the combination of pin and disk increased with an increase in the AE count rate under both unlubricated and lubricated conditions ; thus it is possible to evaluate the specific wear rate from the AE count rate. The specific wear rate and the AE count rate also increased with the increase in the surface damage such as the equivalent cross-sectional area of microgrooves of the pin and disk
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