大气等离子喷涂Sm2Zr2O7热障涂层的微观组织  

Microstructure of Sm_2Zr_2O_7 thermal barrier coating prepared by atmospheric plasma spraying

作　　者：张红松[1] 李振军[1] 徐强[2] 王富耻[2] 王全胜[2] 刘玲[2] 

机构地区：[1]河南工程学院机电工程系,河南郑州450007 [2]北京理工大学材料科学与工程学院,北京100081

出　　处：《材料热处理学报》2008年第3期163-167,共5页Transactions of Materials and Heat Treatment

摘　　要：以Sm2O3和ZrO2为原料,采用固相反应法制备了热喷涂用Sm2Zr2O7粉末,并采用大气等离子喷涂技术制备了Sm2Zr2O7热障涂层。利用X射线衍射(XRD)、扫描电镜(SEM)等手段研究了Sm2Zr2O7粉末和Sm2Zr2O7涂层的微观组织、涂层结合强度和热导率。结果表明,制备的Sm2Zr2O7粉末主要呈不规则颗粒状,颗粒内部结合紧密,满足热喷涂的需要。喷涂前后Sm2Zr2O7相成分没有发生任何变化,表现出良好的相稳定性能。所制备的Sm2Zr2O7热障涂层组织结构致密,涂层各界面结合紧密。涂层的孔隙率约为14.31%,结合强度约为19.8MPa。在相同的孔隙率下,Sm2Zr2O7涂层的热导率仅为YSZ涂层37.6%。Sm2Zr2O7 powder for thermal spraying was synthesized by solid reaction method using Sm2O3 and ZrO2 as raw materials, and Sm2Zr2O7 thermal barrier coatings were prepared by atmospheric plasma spraying. Microstructure and phases of Sm2Zr2O7 powder and thermal barrier coatings were examined by X-ray diffraction（XRD） and scanning electrical microscopy. The binding strength and thermal conductivity of the Sm2Zr2O7 thermal barrier coating were measured by pulling method and laser-flash method, respectively. The results show that Sm2Zr2O7 powder with unregular particle shape and a compact congregating microstructure are suitable for thermal spraying. No change of phase composition in the Sm2Zr2O7 powder is observed after thermal spraying. The Sm2Zr2O7 thermal barrier coating has a compact microstructure and a higher binding strength between the coating and substrate. The porosity and binding strength of the coating are about 14.31% and 19.8MPa, respectively. The thermal conductivity of Sm2Zr2O7 thermal barrier coating is only 37.6 % of that of YSZ thermal barrier coating under the condition of the same porosity.

关 键 词：稀土锆酸盐 热障涂层 微观组织 热导率 

分 类 号：TG174.44[金属学及工艺—金属表面处理]