粘结层和陶瓷层厚度对纳米结构热障涂层性能的影响  

Effects of Thickness of Bond Coat and Ceramic Coating on the Properties of Nano-structure Thermal Barrier Coatings

作　　者：何箐[1] 李嘉[1] 詹华[1] 汪瑞军[1] 王伟平[1] 

机构地区：[1]中国农业机械化科学研究院表面工程技术研究所,北京100083

出　　处：《表面技术》2013年第1期17-20,41,共5页Surface Technology

摘　　要：采用超音速火焰喷涂+大气等离子喷涂工艺,在K403高温合金表面制备不同层厚比的NiCrA-lY/纳米7YSZ热障涂层,研究了涂层厚度变化对热障涂层表面粗糙度、结合强度、热震性能和热循环寿命的影响规律。结果表明:当粘结层厚度一定时,随着陶瓷层厚度的增加,其表面粗糙度增加,涂层结合强度下降;当粘结层厚度为50μm时,热障涂层的抗热震性能随陶瓷层厚度增加而降低,粘结层厚度提高至100μm时,热障涂层的抗热震性能随陶瓷层厚度增加先提高,后降低,热障涂层在1100℃的热循环寿命测试结果也基本对应这一规律;当粘结层厚50μm且陶瓷层/粘结层的层厚比在(1～2)∶1的范围内,或者粘结层厚100μm且陶瓷层/粘结层的层厚比在(2～2.5)∶1范围内时,热障涂层具有较优异的性能。The NiCrA1Y＋7YSZ thermal barrier coatings（TBCs） with various thickness were prepared by High Velocity Oxygen-Fuel Spray（HVOF） and Atmosphere Plasma Spray（APS） on the surface of K403 superalloy, the effect of thicknesses of coating on the surface roughness, bond strength, thermal shock resistance, thermal cycle life of TBCs were studied. The results show that surface roughness increases and bond strength decreases with thickness of ceramic coating increasing, when the thickness of bond coat is 50 μm, thermal shock resistance and thermal cycle life are decreased with thickness of ceramic coating increasing. When the thickness of bond coat is 100μm, the thermal shock resistance of TBC increases first and then reduces with the increase of thickness of the top layer, at the same time the thermal cycle life test result of TBC is to corresponded to that rule at 1100℃. Depend on these tests, confirmed TBC of NiCrAlY/nano-7YSZ exhibites excellent performance,when the thickness of bond coat is 50 μm and 100 μm, the ratio of thickness with top coating/bond coat is 2 to 1 and 2.5 to 2 respectively.

关 键 词：热障涂层 陶瓷层厚度 层厚比 热循环寿命 

分 类 号：TG174.453[金属学及工艺—金属表面处理]