Improvement of Fatigue Strength of Partially Stabilised Zirconia by Shot Peening

Author:  Koji Takahashi, Kae Iwanaka
Source:  ICSP-13
Doc ID:  2017060
Year of Publication:  2017
Abstract:  
Introduction: Partially stabilised zirconia (PSZ) can exhibit superior fracture toughness than other ceramics which makes it suitable for applications such as mechanical components and dental materials. The surface cracks induced by machinig leads to reduction in the fatigue strength if the size of the crack is larger than the acceptable size. The surface cracks in steels are rendered harmless by shot peening (SP), from the viewpoint of the fatigue limit [1]. Recent studies have shown that SP introduces compressive residual stresses near the surfaces of ceramics[2]. Takahashi et al. reported that a compressive residual stress of 1800 MPa introduced in PSZ and the apparent fracture toughness and flexural strengths were improved by SP [3]. However, the effects of SP on the cyclic fatigue strength of PSZ have not yet been studied.