Processing of a low-costγ-γ'NiPtAl coating with improved oxidation resistance  

作　　者：Yan Jiang Liang-Liang Wei Jian He Hong-Bo Guo 

机构地区：[1]School of Materials Science and Engineering,Beihang University,Beijing 100191,China [2]Key Laboratory of High-Temperature Structural Materials and Protective Coatings,Ministry of Industry and Information Technology,Beihang University,Beijing 100191,China

出　　处：《Rare Metals》2024年第6期2832-2841,共10页稀有金属（英文版）

基　　金：financially sponsored by the National Natural Science Foundations of China(Nos.51590894,51425102,51231001);China Postdoctoral Science Foundation(No.2017T100023)。

摘　　要：A novelγ-γ'(Ni solid solution—Ni_(3)Al)NiPtAl coating was produced on advanced single-crystal(SC)superalloy N5 by electroplating of a thin Pt coating with~3μm in thickness followed by heat treatment at 1000℃in vacuum.For comparison,a traditionalγ-γ'NiPtAl coating was also produced by electroplating of a thick Pt coating with~6μm in thickness followed by heat treatment at 1100℃in vacuum.The novel coating has a mass gain of~0.5 mg·cm^(-2)after 100 h 1-h cyclic oxidation at 1150℃,showing better oxidation resistance than the traditional coating.An oxide scale mostly consisting ofα-Al_(2)O_(3)grew on the novel coating because the element Cr from the SC alloy substrate contributes to the formation ofα-Al_(2)O_(3).Pt content in the novel coating has significant effect on the oxidation resistance.The optimized Pt content in the coating is about 16 at%,which is helpful to reduce the diffusion of harmful elements from the substrate into the coating but also to reduce the cost of the coating.

关 键 词：γ-γ'NiPtAl coating PLATINUM OXIDATION Al_(2)O_(3) SUPERALLOY 

分 类 号：TQ153[化学工程—电化学工业]