Abstract
Friction and wear behavior of SiAlON were investigated under reciprocating sliding and fretting conditions. A metallic ball on SiAION disc configuration was used for all tests. In the case of reciprocating sliding, highest friction coefficient (0.48) was observed under a normal load of (400 N). Lowest friction coefficient (0.05) was observed using SAE 40 with EP additive as lubricant. In case of fretting, highest friction coefficient (0.475) was observed under a normal load of 60 N. Wear of all SiAIONSs increased with the increase in sliding distance and decreased with the increase in sliding velocity. Wear was found independent of normal load. In case of counter face steel, wear increased with the increase in sliding distance and normal load, and was found independent of sliding velocity. Lowest specific wear rate (7.4x 10 -5 mm 3 N -1 m -1 ) was observed for SiAION and highest specific wear rate (9.3x 10 -5 mm 3 N -1 m -1 ) was observed for steel in reciprocating sliding conditions. In case of fretting, wear increased with the increase in fretting time and normal load and decreased with the increase in fretting amplitude. Transition from high to low wear occurred at fretting amplitude of (100 - 150 μm). High specific wear rate of SiAION and steel was observed in fretting as compared to reciprocating sliding. Microscopic studies proved useful for understanding wear mechanism.
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