A Study of the Effect of Wear Particles and Adhesive Wear at High Contact Pressures

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Abstract
The wear rate and friction characteristics were determined for certain combinations of cobalt base alloys and stainless steels when rubbed together at unit pressures up to 300,000 psi in an environment of demineralized water at room temperature. Wear rate and friction data were collected both in the presence and absence of wear particles. A study was also made on the effect of sliding-surface geometry in trapping wear particles. The results suggest that an exponential relationship exists between wear rate and stress for the materials of test and this relationship is influenced by material combinations and sliding velocity. Entrapped wear particles also affect the wear rate. Because the wear rate appears to increase sharply at some nominal contact stress when the data is plotted on Cartesian coordinates, the authors define an “Apparent Critical Stress”, using this term and a wear factor term to aid in the evaluation and discussion of results.

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