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1 1999

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Effects of humidity on friction and wear of Al-Si alloy impregnated graphite composite

Goto H., Omori S., Uchijo K.

Applied Mechanics and Engineering

1999

Vol. 4, no spec.

139-145

Pin-on-disk type sliding friction and wear experiments for an Al-Si alloy impregnated graphite composite (pin) in contact with a bearing steel (disk) were conducted at two loads in air to investigate the effects of relative humidity (RH) on the tribological characteristics of the composite. The friction and wear behavior and the pin-lifting phenomena due to the entrance of wear particles into the contacting surfaces were continuously measured during the experiments. SEM observations, together with EPMA, were also conducted to examine the material transfer on the sliding surfaces of the pin and disk. At 100 N, the friction coefficient is high at low RH levels, decreases with increasing RH to a minimum between 50 and 70 % RH and increases a little at high RH levels. The wear rate is very high in a severe wear regime at low RH levels, decreases with increasing RH to a minimum in a mild wear regime between 30 and 60 % RH and increases a little at high RH levels. From the EPMA results, at the RH levels where the friction and wear exhibit the minimum, the wide, compacted films consisting of the mixtures of graphite powder and wear particles of the Al-Si alloy are generated on the disk sliding surface. The films, preventing metal-to-metal contact with a release in adhesion, lead to a decrease in friction and wear.