High Temperature Wear of Plasma-Sprayed <TEX>$ZrO_2-Y_2O_3$</TEX> Coatings

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J. Korean Ceram. Soc. > Volume 30(12); 1993 > Article

Journal of the Korean Ceramic Society 1993;30(12): 1059.

플라즈마사용법에 의한 $ZrO_2-Y_2O_3$ 코팅의 고온에서의 마모

김장엽, 임대순, 안효석¹

고려대학교 재료공학과
¹한국과학기술원 Tribology 연구실

High Temperature Wear of Plasma-Sprayed $ZrO_2-Y_2O_3$ Coatings

ABSTRACT

The sliding wear behavior of the plasma sprayed zirconia containing 8wt% yttria was investigated over a range of room temperature to 800℃. Both of the friction coefficient and the wear loss increased reaching its maximum at about to 499℃. and then decreased again with increasing temperature up to 800℃. The worn surface at elevated temperature were observed and analyzed by scanning electron microscopy and X-ray diffractometer to study the mechanisms of high temperature wear behavior. Surface morphology of the worn samples changes with temperature. Monoclinic (m)/tetragonal (t) x-ray peak intensity ratio of wear debris and worn surface decreased with increasing temperature. Non-transformable tetragonal (t') to metastable tetragonal (t) phase transformation of worn surface increased with increasing temperature. The results indicate that dehumidification and above phase changes are contributing to the high temperature wear behavior of the plasma sprayed ZrO2-Y2O3 coatings.