各種セラミックスの転がり接触による表面損傷

概要

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Discs of typical engineering ceramics such as silicon carbide, alumina, zirconia and SiAlON were tested in the ball-on-disc type rolling contact fatigue mode using steel balls under lubricated conditions. The fatigue life of the ceramics increased in the order described above. By calculating the maximum tensile stress generated on the edge of a Hertzian contact area in the ceramic discs and comparing with the inherent strength of the material, it was possible to estimate whether the fracture mode depends on the Hertzian cracks or not. Although the cracks occurred in silicon carbide and alumina, no Hertzian cracks appeared in SiAlON materials in both the pressureless sintered and HIPed states for a stress level of 5.88 GPa. It is also clarified that HIP treatment improves the fatigue life two orders of magnitude.
1997-03-01