Acoustic microscopy has been applied to the study of recently developed ceramics after sliding at 100, 300 and 500°C. It was found that silicon nitride was severely damaged by developing subsurface cracks caused by repeated sliding contacts at every temperature, whereas partially stabilized zirconia was damaged from originally existing subsurface voids at high temperatures. In a damaged region on the rubbed surface of zirconia, the velocity of the leaky surface wave which depends on the elastic property of the material remarkably varied from that before sliding, indicating an occurrence of stress induced phase transformation due to the sliding.
ASJC Scopus subject areas
- Physics and Astronomy(all)