Title :
Residual stresses and their effect on wear behavior of polycrystalline zirconia overcoated disks
Author :
Ganapathi, S.K. ; Spada, F.E. ; Talke, F.E.
Author_Institution :
Center for Magnetic Recording Res., California Univ., San Diego, La Jolla, CA, USA
fDate :
9/1/1992 12:00:00 AM
Abstract :
Scanning and transmission electron microscopy studies were conducted to investigate the wear behavior of unlubricated polycrystalline zirconia-overcoated disks. The results indicate that the overcoat is susceptible to cracking in the direction of sliding. Cracking in the zirconia-overcoated disks appears to initiate at triple points and propagates along the grain boundaries. The tendency to crack formation appears to be related to the presence of a residual stress in the sputtered overcoat and also to nanometer-scale porosity at the grain boundaries. Preliminary X-ray diffraction investigations suggest that a compressive residual stress of about 3.5 GPa is present in the overcoat
Keywords :
X-ray diffraction examination of materials; cracks; grain boundaries; internal stresses; magnetic disc storage; scanning electron microscope examination of materials; transmission electron microscope examination of materials; wear resistant coatings; zirconium compounds; SEM; TEM; X-ray diffraction; compressive residual stress; crack formation; cracking; grain boundaries; nanometer-scale porosity; polycrystalline ZrO2 overcoated discs; residual stress; sliding; transmission electron microscopy; triple points; wear behavior; Compressive stress; Grain boundaries; Protection; Residual stresses; Scanning electron microscopy; Sputtering; Testing; Transmission electron microscopy; X-ray diffraction; X-ray scattering;
Journal_Title :
Magnetics, IEEE Transactions on
