镍基高温合金GH202表面纳米陶瓷涂层抗高温氧化性能研究  

Study on Oxidation Resistance of Nano-ceramic Coating for Ni-based High Temperature Alloy GH202

作　　者：吴安如[1] 古一[2] 

机构地区：[1]湖南工程学院机电系,湖南湘潭411101 [2]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《表面技术》2004年第6期43-44,47,共3页Surface Technology

摘　　要：　为了弥补高温合金抗高温氧化性能的不足,解决高温力学性能与抗高温氧化性之间的矛盾,在高温合金GH202合金表面增加含纳米高温陶瓷涂层CXM98 1,通过氧化动力学实验和能谱分析技术对涂层 基体合金体系的抗高温氧化性能进行了研究。实验结果得出:含纳米陶瓷涂层能有效的阻滞合金的高温氧化进程,极大的提高了合金的耐高温抗氧化性能。不论有无涂层,在900℃长时间扩散退火过程中,氧均通过涂层或金属表面向基体合金进行扩散,基体合金中的Cr、Al元素向涂层 基体合金界面上坡扩散,环境中氧原子通过涂层向基体合金扩散,在界面处靠涂层一侧主要形成Cr2O3扩散层,界面的基体一侧主要形成Al2O3晶间氧化层;有涂层与无涂层试样的区别在于氧的扩散速率和扩散通量存在快慢、大小的差别。The nano-ceramic coating CXM98-1 was prepared on the base alloy GH202. The oxidation resistance and elements diffusion behavior of the coating/alloy system were investigated by oxidation dynamics experiment and EDS analysis technique. The experiment results indicate that the nano-ceramic coating can retard inward diffusion of oxygen, which can obviously improve oxidation resistance of the alloy at high temperature. And after 900℃ high temperature oxidation, the diffusion of oxygen to matrix alloy and the uphill diffusion of the Cr and Al to surface were observed in both samples with coating and without coating. The distinguish between samples with coating and without coating is the difference of diffusion rate and diffusion flux of oxygen. The Cr_2O_3 diffusion layer was formed along interface between the coating, and the Al_2O_3 grain boundary oxide layer was observed along interface in matrix alloy.

关 键 词：高温合金 含纳米陶瓷涂层 抗高温氧化性 上坡扩散 

分 类 号：TQ174.2[化学工程—陶瓷工业]