Holographic Characterization of Ceramics. Part IV. (Measurement of Surface Roughness on Si3N4Bearing Surfaces).

摘要

A method for measuring the surface roughness of ceramic bearings was developed using coherent light techniques. The method is noncontacting and nondestructive and is applicable to cylindrical (and spherical) surface geometries. Surface roughnesses varying from 193microinches to 9.46microinches (A.A.) were measured in the longitudinal and circumferential directions on typical Si3N4bearing specimens. This technique,referred to as Coherent Surface Analysis,determines surface roughness by analyzing the scattering of a laser beam from random surfaces. Since the laser beam can be scanned over the entire surface,it is possible to measure point to point variations in roughness. This feature was used to measure the change in surface roughness caused by rolling contact fatigue. (Author)