Ni32Co23Cr8Al2Si纳米晶涂层900℃热腐蚀性能  

Hot Corrosion Resistance of Sputtered Ni32Co23Cr8Al2Si Nanocrystalline Coating at 900℃

作　　者：陈洪玉[1] 周月波[1] 孙俭峰[1] 张海军[1] 

机构地区：[1]黑龙江科技学院,黑龙江哈尔滨150027

出　　处：《稀有金属材料与工程》2013年第S2期537-540,共4页Rare Metal Materials and Engineering

基　　金：黑龙江省教育厅项目(11531319)

摘　　要：利用磁控溅射技术在铸造Ni32Co23Cr8Al2Si合金上溅射了相同成分的纳米晶涂层。900℃的75%Na2SO4+25%NaCl(质量分数)混合盐热腐蚀试验结果表明,溅射Ni32Co23Cr8Al2Si纳米晶涂层由于晶粒尺寸细小,促进了保护性氧化物形成元素Al向氧化前沿的快速扩散和保护性Al2O3层的快速形成,使得溅射Ni32Co23Cr8Al2Si纳米晶涂层表现出更优异的抗热腐蚀性能。A sputtered nanocrystalline coating of Ni32Co23Cr8Al2Si alloy was obtained by magnetron sputtering technique on the same alloy substrate.The hot corrosion behavior of the cast Ni32Co23Cr8Al2Si alloy and its sputtered Ni32Co23Cr8Al2Si nanocrystalline coating in molten 75% Na2SO4+25% NaCl at 900 ℃ for 70 h were studied.The results show that the sputterd Ni32Co23Cr8Al2Si nanocrystalline coating exhibits much better hot corrosion resistance than its cast superalloy as a result of the formation of a continuous and compact Al2O3 scale due to the enhanced diffusion of Al to the oxidation front along the increased'short-circuit'grain boundaries.

关 键 词：氧化 镍基高温合金 磁控溅射 

分 类 号：TG174.4[金属学及工艺—金属表面处理]