ぜい性材料の固体微粒子によるージョン(第10報) : 正方晶ZrO_2セラミックスのージョンによる強化

概要

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Strengthening tetragonal ZrO_2 ceramics by the erosion caused by iron spheres and SiC abrasives has been studied. When tetragonal ZrO_2 ceramics, TOSO : TZ-3 Y, was eroded by SiC abrasives with an average particle size of 0.5 mm, at 100 m/s and 45 deg, a surface layer about 15-20 μm thick with compressive stress was formed and the bending strength in-creased from 850 MPa to 1130 MPa on the average. The surface layer acquired a large apparent K_<IC>. Reversion of the (002)/(200) peak height ratio, induction of a 1200 MPa compressive stress in tetragonal ZrO_2, and broadening in all diffraction peaks were observed in the surface layer in X-ray diffraction analysis. Small amounts of monoclinic and rhom-bohedral ZrO_2 transformed from tetragonal ZrO_2 were also detected. After heat treatment at 1200℃ for 2 h, monoclinic and rhombohedral ZrO_2 disappeared. The crystallinity of tetragonal ZrO_2 was improved and the compressive stress became zero, but the (002)/(200) peak height ratio kept the reversion. Heat treatment decreased the bending strength of eroded specimens to 580 MPa.
社団法人日本セラミックス協会の論文
1989-02-01