B-15 コーティング材の高温耐食性(材料I,一般講演)

概要

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Hot corrosion of gas turbine hot parts would become major problem for using various fuels. In this study, hot corrosion resistance of MCrAlY coatings, thermal barrier coating, and aluminum pack cementation coating was evaluated by burner rig test at 900℃ for 300 hours. The amount of alkali sulphate of combustion gas under test condition was approximately 80 times larger than that of combustion gas under Hitachi H25 condition. Three kinds of MCrAlY coatings with different chromium content have similarly high corrosion resistance. Thermal barrier coating can be considered as more effective than MCrAlY coatings under the combustion gas condition when it contains alkali sulphate. Al coating shows moderate degree of corrosion resistance, while sulfate forms in Al coating.
公益社団法人日本ガスタービン学会の論文
2008-10-01