第32卷第2期材料热处理学报Vol.32No.22011年2月TRANSACTIONSOFMATERIALSANDHEATTREATMENTFebruary2011高能等离子喷涂热障涂层及其热冲击性能Sm2Zr2O7张红松1，时蕾2，杨树森2，徐强3，王富耻3，王全胜3(1.河南工程学院机械工程系，河南郑州450002;2.郑州铁路职业技术学院机车车辆系，河南郑州450052;3.北京理工大学材料科学与工程学院，北京100081)摘要:采用高能等离子喷涂技术制备了热障涂层，用射线衍射()扫描电镜()等手段研究了涂层的相成Sm2Zr2O7XXRD、SEM分微观组织;采用拉伸法和水淬法测试了涂层的结合强度及热冲击性能结果表明，喷涂前后相成分未发生变化，表、。Sm2Zr2O7现出良好的相稳定性能所制备的涂层结构致密，涂层各界面结合紧密涂层的孔隙率仅为，结合强度为。Sm2Zr2O7。4.72%29MPa。涂层在经历20次热冲击后从表面层/金属粘结层界面处脱落，熔融颗粒内部纵向显微裂纹及熔融颗粒之间彼此分离所形成的横向裂纹的共同作用导致了涂层的失效。关键词:等离子喷涂;热障涂层;微观组织;热冲击中图分类号:TG174.44文献标志码:A文章编号:1009-6264(2011)02-0112-07Sm2Zr2O7thermalbarriercoatingspreparedbyhighenergyplasmasprayinganditspropertyofthermalshockingZHANGHong-song1，SHILei2，YANGShu-sen2，XUQiang3，WANGFu-chi3，WANGQuan-sheng3(1.DepartmentofMechanicalEngineering，HenanInstituteofEngineering，Zhengzhou450007，China;2.DepartmentofLocomotiveandRollingStock，ZhengzhouRailwayVocationTechnicalCollege，Zhengzhou450052，China;3.SchoolofMaterialScienceandEngineering，BeijingInstituteofTechnology，Beijing100081，China):，AbstractSm2Zr2O7thermalbarriercoatingswerepreparedbyhighenergyplasmasprayingtechnologyPhaseandmicrostructureofthecoatingswerestudiedbyX-raydiffraction(XRD)andscanningelectronmicroscope(SEM).BondingstrengthandthermalshockingpropertyofthecoatingswereinvestigatedbypullingtestandwaterQuenchingmethod，respectively.Resultsshowthatthereisnochange，ofphaseofSm2Zr2O7powdersafterthermalsprayingwhichshowsbetterphasestability.Thecoatingshaveacompactmicrostructureand，theinterfacebindtightlybetweenSm2Zr2O7coatingNiCoCrAlYbondinglayerandsubtrateareobtained.Porosityinthecoatingsisabout4.72%.Itsbondingstrengthis29MPawhichishigherthanthatofSm2Zr2O7thermalbarriercoatingpreparedbyatmosphericplasmaspraying.ThiscoatingspallsattheinterfacebetweenthetopSm2Zr2O7layerandNiCoCrAlYmetalbondinglayeraftertwentythermalcycles.Thelognitudinalmicro-carcksmeltedpowderparticlesandtransversecracksformedbyseperationofthemeltedparticlesleadtothespallingofthecoatings..Keywords:plasmaspr