表面粗糙度对PS-PVD YSZ陶瓷层性能的影响  

Effect of surface roughness on properties ofPS-PVD YSZ ceramic coating

作　　者：毛杰 马景涛 邓畅光 邓春明 宋进兵 刘敏 宋鹏[2] MAO Jie;MA Jing-tao;DENG Chang-guang;DENG Chun-ming;SONG Jin-bing;LIU Min;SONG Peng(The Key Laboratory of Guangdong for Modern Surface Engineering Technology,National Engineering Laboratory for Modern Materials Surface Engineering Technology,Guangdong Institute of New Materials,Guangzhou 510650,China;Faculty of Material Scienceand Engineering,Kunming University of Science and Technology,Kunming 650093,China)

机构地区：[1]广东省新材料研究所现代材料表面工程技术国家工程实验室广东省现代表面工程技术重点实验室,广州510650 [2]昆明理工大学材料科学与工程学院,昆明650093

出　　处：《材料工程》2020年第5期144-150,共7页Journal of Materials Engineering

基　　金：国家自然科学面上基金(51771059);国家科技重大专项(2017-VI-0010-0081);广东省科技计划项目(2019B010936001,2017A070701027,2014B070705007);广东省科学院项目(2019GDASYL-0104022)。

摘　　要：采用PS-PVD工艺在预制有NiCoCrAlYTa黏结层的K417G高温合金上制备YSZ陶瓷层;采用万能拉伸试验机、粒子冲刷仪、静态氧化炉等设备测试PS-PVD YSZ陶瓷涂层的结合强度、抗粒子冲刷和抗高温氧化性能;采用SEM和EDS分析涂层表面、截面形貌和元素分布等。结果表明:表面粗糙度对YSZ陶瓷层拉伸结合强度、抗粒子冲刷和抗高温氧化性能的影响很大。随着粗糙度的增大,结合强度先增大而后减小。Ra=0.40μm表面上沉积的YSZ涂层,其结合强度最高,达到23.5 MPa。拉伸断裂发生在涂层内部,并距离黏结层40~70μm的位置。随着表面粗糙度的增大,冲刷速率先减小而后增大,Ra=0.40μm涂层的抗粒子冲刷性能最好,冲刷速率仅为2.8×10^-3 g/g,表面起伏小和孔隙率低是涂层具有良好抗粒子冲刷性能的重要原因。不同表面粗糙度制备的YSZ涂层均能生成致密连续的热生长氧化物(TGO)层。粗糙度大则生长的TGO起伏大,更容易导致局部增厚和应力集中而失效。YSZ ceramic coating was prepared by PS-PVD process on K417G superalloy prefabricated with NiCoCrAlYTa bond coating.The tensile bond strength,particle erosion resistance and high temperature oxidation resistance of PS-PVD YSZ ceramic coating were tested by the universal tensile testing machine,particle erosion device and static oxidation furnace.The SEM and EDS were used to analyze the surface,cross-section morphology and element distribution.The results show that surface roughness has great influence on tensile bond strength,particle erosion resistance and high temperature oxidation resistance of YSZ ceramic coating.The bonding strength is increased first and then decreased with the increase of surface roughness.The coating prepared on the surface of R a=0.40μm has the highest bonding strength of 23.5 MPa.The tensile fracture occurs in the interior of YSZ ceramic coating at a distance of 40-70μm from the bond coating.The erosion rate is decreased first and then increased with the increase of surface roughness.The coating prepared on the surface of R a=0.40μm has the best particle erosion resistance,and the erosion rate is 2.8×10^-3 g/g.Small surface fluctuations and low porosity are two important reasons for preventing fast particle erosion.The YSZ coatings prepared with different surface roughness can produce dense and continuous TGO layer.Larger surface roughness causes larger fluctuation of growing TGO layer,which is more likely to cause local thickening and stress concentration,thus leading to failure.

关 键 词：等离子喷涂-物理气相沉积 YSZ陶瓷层 表面粗糙度 结合强度 粒子冲刷 高温氧化 

分 类 号：TG174.453[金属学及工艺—金属表面处理]