熱水中におけるY-PSZ及びY-PSZ/Al_2O_3セラミックスのヘルツ接触疲労試験

概要

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A Hertzian contact fatigue test was proposed to simulate conventional rolling wear experiments, by which the wear behavior and phase transformation of 3 mol%Y_2O_3-partialy stabilized zirconia (3Y-PSZ) and 3Y-PSZ/20 mass%Al_2O_3 ceramics in water at 90℃ were investigated. The Hertzian stress contact fatigue property was found to be greatly dependent on fracture strength and remarkably improved by the post-HIP treatment. The Hertzian contact stress was revealed to have minor influence on the water-assisted tetragonal-to-monoclinic phase transformation in Y-PSZ-based ceramics at temperatures as low as 90℃. The addition of Al_2O_3 into Y-PSZ effectively suppressed the low-temperature phase transformation, but it did not lead to the improvement in the contact fatigue property probably because the strenth of the resultant composite was lower than the monolithic Y-PSZ ; however, more work is required to completely understand the Hertzian stress contact fatigue behavior of composites.
社団法人日本セラミックス協会の論文
1999-10-01