2321 融液成長複合材料の超高温環境下における高圧水蒸気劣化特性(S32-2 セラミックスおよびセラミックス系複合材料(2),S32 セラミックスおよびセラミックス系複合材料)

概要

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The corrosion behavior of melt growth composites such as Al_2O_3/Y_3Al_5O_<12>(YAG), Al_2O_3/GdAlO_3(GAP), Al_2O_3/Er_3Al_5O_<12>(EAG) or Al_2O_3/YAG/ZrO_2 was investigated at 1500℃ in a high water vapor pressure environment for time up to 900h. There was observed that weight loss led to parabolic kinetics by the presence of high partial water vapor pressure of 150kPa. The microstructure of surface underwent a localized etching in phase-boundaries at the first stage. In addition, the facet in Al_2O_3 phase was observed in samples. Furthermore, the coarsening of corrosion product increased at long corrosion time. Finally, it was spread over the whole surface. The strength degradation was seen that the flexural strength decreased down to 24.8% in Al_2O_3/GAP system after corrosion test at 1500℃ in PH2O=150kPa for 200h.
社団法人日本機械学会の論文
2005-09-18