2009•Zhongguo fushi yu fanghu xuebaoRequires access

INVESTIGATION OF HIGH TEMPERATURE HOT CORROSIONBEHAVIOR OF THERMAL BARRIER COATINGS PREPARED BY EB-PVD

Xiaofang Bi, Hongbo Guo, Shengkai Gong, Huibing Xv

Abstract

High temperature oxidation and hot corrosion behaviors of MCrAlY coating,thermal barrier coatings (TBCs) and gradient thermal barrier coatings prepared by electron beam physical vapor deposition (EB-PVD) have been investigated.Although these coatings showed excellent oxidation behavior,the mass gain for MCrAlY coatings was larger after being sprayed with a 2 mg/cm 2 deposit of Na 2SO 4 and tested at 950℃.The lower mass gain for TBCs and GTBCs indicated that the ceramic coating has a benefit to improve the hot corrosion behavior.However,thermal cyclic life time for TBCs and GTBCs decreased during hot corrosion testing.

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Key concepts: Thermal barrier coating, Materials science, Coating, Corrosion, Physical vapor deposition, Electron beam physical vapor deposition, Composite material, Scanning electron microscope