Effect of Surface Grinding on Low Temperature Degradation of 3Y-TZP

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J. Korean Ceram. Soc. > Volume 30(2); 1993 > Article

Journal of the Korean Ceramic Society 1993;30(2): 164.

표면 연마가 3Y-TZP의 저온열화에 미치는 영향

김대준, 이홍림¹, 정형진

한국과학기술연구원 재료연구단
¹연세대학교 세라믹공학과

Effect of Surface Grinding on Low Temperature Degradation of 3Y-TZP

ABSTRACT

Grinding of 3mol% Y-TZP enhanced the texturing of t-ZrO2, which is represented by the increased I(002)t/I(200)t peak intensity ratio, and an asymetric broadening of (111)t peak. The degree of texturing and asymetric broadening depended on a seversity of grinding. The asymetric (111)t peak broadening was resulted by the formation of r-ZrO2. When aged at 25$0^{circ}C$ for 120h, r-ZrO2 transformed to t-ZrO2 due to the relief of stressed surface area and the amount of tlongrightarrowm transformation inversely varied with the I(002)t/I(200)t. The inverse dependence was interpreted by that the degree of texturing determines the magnitude of residual surface stress and the lattice relaxation of t-ZrO2, which causes the low temperature degradation, is retarded as the residual stress becomes greater.