Proceedings of WTC2005 an ideal sphere was numerically integrated, which removed Proceedings of WTC2005 World Tribology Congress III

relatively quickly, it such coatings still substantially increased the fatigue life of a coated part (Polonsky et al., 1998). Successful design of such fatigue resistant coatings could allow them to serve as finite-life run-in coatings, only providing polishing during a specified amount of time. Ideally, after this specified amount of time, the coating would provide no additional surface polishing. Understanding the changes in the coating abrasiveness during the sliding process is critical for the proper design and implementation of such finite-life run-in coatings. This study investigated both changes in the B4C coating asperities during the polishing process, particularly the coating asperity height and sharpness, as well as the influence of numerous parameters on the coating abrasiveness, including coating thickness, overall coating roughness and counterpart material tempering. errors due to roughness and non-circularity of the wear scar and was independent of viewing angle (Harris and Krauss, 2001). In addition, the coating wear track was also inspected using an atomic force microscope (AFM) with a spatial resolution of 0.167µm/pixel in the horizontal dimensions. The average coating abrasiveness)(nA during n cycles id defined as the total volume of the steel removed divided by the total sliding distance according to rnVdVnA π2//) ( = = , (1) where V is the volume of steel removed, d is the distance traveled, n is the number of cycles and r is the ball-on-disc wear track radius. ABRASIVENESS OF BORO