Rolling-Contact Studies with Four Refractory Materials to 2000 F

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Abstract
Four refractory materials were tested in the five-ball fatigue tester to study their behavior under repeated stresses applied in rolling contact: hot-pressed alumina, cold-pressed-and-sintered alumina, self-bonded silicon carbide, and nickel-bonded titanium carbide cermet. The failures that developed in all four materials were shallow, eroded areas of apparent surface origin unlike fatigue spalls found in bearing steels. The load capacity of hot-pressed alumina was the highest of the four materials tested but was only about 7% of that of a typical bearing steel. Preliminary tests at elevated temperatures indicated that hot-pressed alumina is capable of rolling-contact operation at temperatures up to 2000 F without gross wear or plastic deformation.

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