Processing and oxidation behavior of Pt-diffused coatings  

作　　者：Liang-Liang Wei Hui Peng Lei Zheng Jing-Yong Sun Hong-Bo Guo 

机构地区：[1]School of Materials Science and Engineering,Beihang University,Beijing 100191,China [2]Key Laboratory of Aerospace Materials and Performance(Ministry of Education),Beihang University,Beijing 100191,China [3]School of Energy and Power Engineering,Beihang University,Beijing 100191,China

出　　处：《Rare Metals》2020年第8期902-908,共7页稀有金属（英文版）

基　　金：financially supported by the Nature Science Foundations of China(Nos.51590894,51425102 and 51231001)。

摘　　要：Pt-diffused coatings were synthesized on Ni10 Al alloy by electroplating a thin layer of Pt(1-5μm)followed by a diffusion treatment in vacuum at 1000-1100℃.Effects of processing parameters(Pt thickness and vacuum diffusion temperature)on the microstructures and chemical composition of Pt-diffused coatings were investigated.Also,the oxidation behavior of the coatings was studied at1100℃.Pt film reveals nano-sized grain size of 93-113 nm.Vacuum diffusion treatment leads to the grain growth.1-μm Pt film with 1000℃/1 h vacuum diffusion fabricates nano-sized Pt-diffused coating which exhibits the best oxidation resistance.And a single continuous Al2O3 scale forms on the coating with low Al(~9 at%)and Pt(~6 at%)contents.Increasing initial Pt thickness would introduce more defects and cracks,leading to a duplex scale and decreasing the oxidation resistance of Ptdiffused coatings.

关 键 词：Platinum-modifiedγ+γ′coatings Pt-diffused coatings ELECTROPLATING Oxidation NANO-STRUCTURE 

分 类 号：TG174.4[金属学及工艺—金属表面处理]