Oxidation Performance and Interdiffusion Behavior of a Pt-Modified Aluminide Coating with Pre-deposition of Ni
来源期刊：Acta Metallurgica Sinica2019年第12期
论文作者：He Liu Shuai Li Cheng-Yang Jiang Chun-Tang Yu Ze-Bin Bao Sheng-Long Zhu Fu-Hui Wang
文章页码：1490 - 1500
摘 要：To refrain the interdiffusion of elements while holding good oxidation resistance,a（Ni,Pt）Al/Ni composite coating was prepared by sequential treatments of electroplating Ni and Pt and successive gaseous aluminization.In comparison with normal（Ni,Pt）Al coating,high-temperature performance of the composite coating was evaluated in isothermal oxidation test at 1100℃.Both the two coatings exhibited good resistance against high-temperature oxidation,but the interdiffusion of elements between composite coating and single-crystal（SC） superalloy substrate was greatly relieved,in which the thickness of secondary reaction zone（SRZ） and the amount of precipitated topologically close-packed phase in the SC alloy matrix were significantly decreased.Mechanisms responsible for delaying rate of coating degradation and SRZ growth/propagation are discussed.
He Liu1,2，Shuai Li1,2，Cheng-Yang Jiang3，Chun-Tang Yu1,2，Ze-Bin Bao1，Sheng-Long Zhu1，Fu-Hui Wang3
1. Institute of Metal Research,Chinese Academy of Sciences2. School of Materials Science and Engineering,University of Science and Technology of China3. Shenyang National Laboratory for Materials Science,Northeastern University
摘 要：To refrain the interdiffusion of elements while holding good oxidation resistance,a（Ni,Pt）Al/Ni composite coating was prepared by sequential treatments of electroplating Ni and Pt and successive gaseous aluminization.In comparison with normal（Ni,Pt）Al coating,high-temperature performance of the composite coating was evaluated in isothermal oxidation test at 1100℃.Both the two coatings exhibited good resistance against high-temperature oxidation,but the interdiffusion of elements between composite coating and single-crystal（SC） superalloy substrate was greatly relieved,in which the thickness of secondary reaction zone（SRZ） and the amount of precipitated topologically close-packed phase in the SC alloy matrix were significantly decreased.Mechanisms responsible for delaying rate of coating degradation and SRZ growth/propagation are discussed.
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