| Abstrakt: |
Friction and wear properties of two forms of silicon nitride (reaction bonded and hot pressed) and two of silicon carbide (reaction sintered and sintered) are reported. The materials were slid against themselves under unlubricated conditions. Tests were run using a simulated inertial sample dynamometer. Sliding speeds ranged from 0.5 to 5.5 m sec-1 with applied loads of 225 or 450 N. Friction coefficients were found to be in the range of 0.15 to 0.8 for both types of material. Friction response was qualitatively correlated with changes in surface chemistry at the sliding interface. Wear rates were of the order of 10-14 to 10-13m3 (Nm)-1, in order-of-magnitude agreement with previous pin-on-disc results reported in the literature. Wear surfaces exhibit plastic deformation, ploughing, and oxide film formation and removal. |
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