2CaO・SiO_2-CaO・ZrO_2系プラズマ溶射熱遮〓皮膜の高温安定性

概要

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Hot corrosion resistance and thermal shock stability of 2CaO・SiO_2 - CaO・ZrO_2,CaO・SiO_2 and CaO・ZrO_2 plasma sprayed thermal barrier coatings were evaluated by investigating the coatings after heating in furnace for 3hours at 1273K with V_2O_5,Na_2SO_4 and NaCl ashes, and by monitoring Acoustic Emission of coatings in 1273K 〓 room temperature thermal cycle test. At hot corrosion test, CaO stabilizing element in the CaO・ SiO_2 and CaO・ZrO_2 readily reacted with V and S compounds, but CaO in amorphous ceramics produced by plasma spraying were relatively resistant to corrosion. Particularly, 2CaO・SIO_2-lO〜30 mass% CaO・ZrO_2 coatings have been shown the excellent hot corrosion resistance and only a few AE counts were detected in thermal cycle test, because the coatings contained a large amount of amorphous compounds and many effective vertical micro-cracks to improve thermal shock resistance.
社団法人日本ガスタービン学会の論文
1992-06-10