基体厚度对PtAl涂层与镍基单晶高温合金互扩散行为的影响  

Effect of substrate thickness on interdiffusion behavior between PtAl coating and nickel-based single crystal superalloy

作　　者：邓鹏 倪建洋 邓春明 尹斌 李风[1] 姜沃 蒋延庆 DENG Peng;NI Jianyang;DENG Chunming;YIN Bin;LI Feng;JIANG Wo;JIANG Yanqing(School of Materials and Energy,Guangdong University of Technology,Guangzhou 510006,China;The Key Lab of Guangdong for Modern Surface Engineering Technology,National Engineering Laboratory for Modern Materials Surface Engineering Technology,Institute of New Materials,Guangdong Academy of Sciences,Guangzhou 510651,China;Praxair Surface Technologies,Changzhou 213164,China)

机构地区：[1]广东工业大学材料与能源学院,广东广州510006 [2]现代表面工程技术国家工程实验室,广东省现代表面工程技术重点实验室,广东省科学院新材料研究所,广东广州510651 [3]普莱克斯表面技术,江苏常州213164

出　　处：《材料研究与应用》2021年第1期9-15,共7页Materials Research and Application

基　　金：广东省重点领域研发计划(2019B010936001);广州市重点领域研发计划项目(202007020008);广东省基础与应用基础研究基金(2020A1515010948);广东省科学院项目(2020GDASYL-20200104028)。

摘　　要：采用电镀Pt气相渗铝的方法,在不同厚度(0.8,1.0和1.3 mm)的镍基单晶高温合金基体表面制备了单相的β-(Ni,Pt)Al涂层.利用SEM/EDS及EPMA等表征方法,研究试样在1100℃热暴露200 h过程中涂层/基体界面的微观结构演变和各组元的元素分布.结果表明:不同基体厚度的PtAl涂层/镍基单晶高温合金试样在1100℃热暴露200 h后截面微观形貌无明显差异,热暴露36 h后在互扩散区下方均形成了分布有TCP相的二次反应区,热暴露200 h后基体厚度为0.8,1.0和1.3 mm的试样中SRZ厚度分别为37,35和34μm;不同基体厚度的PtAl涂层/镍基单晶高温合金试样,在1100℃热暴露200 h后成分分布无明显差异,涂层与基体间主要发生Ni,Co,Cr和Ru的外扩散及Pt和Al的内扩散.Single phaseβ-(Ni,Pt)Al coating was prepared on the nickel-based single crystal superalloy with different substrate thickness via electroplating Pt and gaseous aluminizing.The microstructure evolution and element interdiffusion behavior between coating and substrate during thermal exposure at 1100℃for up to 200 h were characterized by scanning electron microscopy(SEM)equipped with energy dispersive spectroscopy(EDS)and electron probe micro-analyze(EPMA).The results show that there is no significant difference in the cross-sectional morphologies of the PtAl coating/superalloy samples with different substrate thickness(0.8 mm,1.0 mm and 1.3 mm)after thermal exposure at 1100℃up for 200 h.Secondary reaction zone(SRZ)containing topological close packed phases(TCP)is formed behind the interdiffusion zone(IDZ).The thickness of the SRZ for the samples with substrate thickness of 0.8 mm,1.0 mm and 1.3 mm were 37μm,35μm,34μm,respectively.There was no significant difference in the composition profiles of the samples with different substrate thickness during thermal exposure for 200 h.During the thermal exposure process,the inward diffusion of Pt and Al from the coating to the substrate are accompanied with the outward diffusion of Ni,Co,Cr and Ru.

关 键 词：PtAl涂层 镍基单晶高温合金 互扩散 基体厚度 

分 类 号：TG174.44[金属学及工艺—金属表面处理]