摘要
长期以来,在高温防护领域广泛应用的MCrAlY系列涂层受到了各国研究者和工程技术人员的持续关注。文中总结了哈尔滨工业大学纳米表面工程课题组近年来将稀土改性技术应用于制备热喷涂MCrAlY系列涂层的有关研究,结果表明:稀土改性可使NiCrAlY涂层的硬度提高30%～40%,涂层和基体间的结合强度达到60 MPa以上。加入稀土的NiCrAlY涂层热震抗力明显增加,其在1000℃的热震循环寿命超过100次以上。在1000℃条件下,加入稀土的NiCrAlY涂层在190 h后依然完整,表面无特殊变化;质量分数0.1%稀土氧化物涂层1000℃氧化250 h增重速率比未加稀土涂层降低了60.53%。加入稀土还可以显著提高NiCrAlY涂层的抗高温硫化能力及抗腐蚀性能。稀土改性可以有效改善MCrAlY系列涂层的高温性能,满足国家对高端装备零部件高温防护涂层的要求。
Over the years, the series of MCrAlY coatings widely used in the field of high temperature protection have received continuous attention from researchers and engineers in various countries. The recent research results on the application of rare earth modification technology to the preparation of thermal sprayed MCrAlY series coatings by the Harbin Institute of Technology were summarized. The results show that the hardness of the NiCrAlY coating modified by rare earth increases by 30%-40% and the bonding strength between the coating and substrate reaches over 60 MPa. Adding rare earth can increase the thermal shock resistance of the NiCrAlY coating with the thermal shock cycles more than 100 times at 1000 ℃. Under 1000 ℃, the NiCrAlY coating added with rare earth is still intact after 190 h, and the surface has no special change. The weight gain rate of the coatings containing 0.1% rare earth oxide is 60.53% lower than that without rare earth addition during oxidation at 1000 ℃ for 250 h. The addition of rare earth can significantly improve the high temperature vulcanization resistance and corrosion resistance of NiCrAlY coating. Rare earth modification can effectively improve the high temperature performance of the MCrAlY series coatings and meet the national requirements for high temperature protective coatings for high-end equipment components.
作者
贾近
刘赛月
孟君晟
王铀
JIA Jin;LIU Saiyue;MENG Junsheng;WANG YOU(School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China;Naval Architec-ture ＆ Marine Engineering College,Shandong Jiaotong University,Weihai 264209,China)
出处
《中国表面工程》
EI
CAS
CSCD
北大核心
2018年第5期54-62,共9页
China Surface Engineering
基金
国家自然科学基金(51671208)~~
关键词
MCRALY涂层
稀土改性
高温性能
MCrAlY coating
rare earth modification
high temperature performance
