燃焼ガス流中Y_2O_3安定化ZrO_2焼結体の耐減肉特性に及ぼす不純物含有量の影響

概要

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In order to examine the influence of impurity content on the characteristics to prevent the recession of yttria stabilized zirconia in combustion gas flow, sintered yttria stabilized zirconia (ZrO_2) specimens with different impurity (Al_2O_3 or SiO_2) contents were prepared and exposed under a combustion gas flow condition (T=1500℃, P=0.3MPa, V=150m/s, P_<H2O>=35kPa, t=5〜20h). As a result, the significant weight loss of high purity ZrO_2 was not found, and it was shown that high purity ZrO_2 has superior characteristics to prevent the recession and is promising candidate materials. In addition, the impurity content influences on the recession characteristics, and the weight loss of ZrO_2 with more impurity increases as the impurity content increases. Thus, in order to prevent the recession, the increase of purity is required. Furthermore, impurity contained in ZrO_2 disappeared selectively from the surface under the combustion gas flow. The disappearance of impurity was also observed under the surface, and the thickness of the layer without impurity under the surface increased according to the exposure time.
社団法人日本材料学会の論文
2006-01-15