Abstract
The friction and wear characteristics of SiC, TiN and TiC were examined in dry and wet atmospheres of oxygen and argon using a pin/disc type apparatus. With atmospheres containing oxygen or water, surface films composed mainly of oxides and/or hydrates of ceramics were produced during runs. The formation of the surface films resulted in suppressing brittle fracture of the rubbing surfaces, and reducing the wear amount by a factor of 4 to 30. With friction pairs containing TiC of highest ability in oxidation, excellent were and friction performance was attainable due probably to formation of a surface film containing TiO2 with low shear strength. Especially, a low friction of about 0.1 was obtained with a combination of TiC pins and TiN disc. This combination is expected to keep a TiO2 film firmly on the TiN surface, since a lattice constant and interatomic distances of TiN are nearly equal to those of TiO of an oxide of Ti which is expected to have a high ability to sustain a TiO2 film.
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