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《Journal of Materials Science and Engineering》 2003-01
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Structure and Oxidation Properties of Thermal Barrier Coatings by Laser Cladding on Superalloy Substrates

GAO Yang+1, PAN Feng+1, LIANG Yong+2, SHI Chang-xu+2 (1^Department of Materials Science and Engineering,Tsinghua University,Beijing 100084,China;2^Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)  
A new type of thermal barrier coating is being developed for gas turbine blades by laser cladding on superalloy substrates.The results show that during rapid melting and and solidification in laser processing,an oriented epitaxial growth,colsely packed columnar structure could be obtained by controlling the process parameters.A alumina layer which exists between the NiCoCrAlY layer and columnar ceramic layer provides for the adherence of the columnar layer to the NiCoCrAlY layer.Scanning electron microscopy and electron probe microanalysis reveal good metallurgical bond between ZrO-2 layer and NiCoCrAlY alloying layer,and between alloying layer and substrate.Chemical modification of ZrO-2 was adopted and eliminated microcrackings of the coatings.High temperature oxidation test reveals oxidation kinetics approximately follow a parabolic rate equation.The oxidation resistance of the laser cladding thermal barrier coatings in air at 1200℃ was significantlky higher than that of plasma sprayed coatings.
【CateGory Index】: TG174.4
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