表面粗糙度对PS-PVD YSZ陶瓷层性能的影响

doi:10.11868/j.issn.1001-4381.2018.001456

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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。R_a=0.40 μm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40~70 μm的位置。随着表面粗糙度的增大，冲刷速率先减小而后增大，R_a=0.40 μm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。

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	毛杰
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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

Abstract：

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=0.40 μm has the highest bonding strength of 23.5 MPa. The tensile fracture occurs in the interior of YSZ ceramic coating at a distance of 40-70 μm 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=0.40 μm 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.

Key words： plasma spray-physical vapor deposition YSZ ceramic coating surface roughness bond strength particle erosion high temperature oxidation

收稿日期: 2018-12-17 出版日期: 2020-05-28

中图分类号:

TG174.453

基金资助: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);广东省科技计划项目(2017A070701027);广东省科技计划项目(2014B070705007);广东省科学院项目(2019GDASYL-0104022)

通讯作者: 毛杰 E-mail: jmao0901@163.com

作者简介: 毛杰(1979-), 男, 教授级高工, 博士, 研究方向为先进高温功能涂层, 联系地址:广州市天河区长兴路363号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(510650), E-mail:jmao0901@163.com

引用本文:

毛杰, 马景涛, 邓畅光, 邓春明, 宋进兵, 刘敏, 宋鹏. 表面粗糙度对PS-PVD YSZ陶瓷层性能的影响[J]. 材料工程, 2020, 48(5): 144-150.
Jie MAO, Jing-tao MA, Chang-guang DENG, Chun-ming DENG, Jin-bing SONG, Min LIU, Peng SONG. Effect of surface roughness on properties of PS-PVD YSZ ceramic coating. Journal of Materials Engineering, 2020, 48(5): 144-150.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2018.001456 或 http://jme.biam.ac.cn/CN/Y2020/V48/I5/144

Fig.1 YSZ陶瓷粉末形貌

Table 1 PS-PVD YSZ陶瓷层工艺参数

Fig.2 不同表面粗糙度的YSZ涂层结合强度

Fig.3 YSZ涂层拉伸断裂形貌
(a)断裂宏观形貌；(b)断裂截面；(c), (d)断裂表面

Fig.4 不同表面粗糙度YSZ涂层的粒子冲刷速率

Fig.5 YSZ涂层粒子冲刷后形貌
(a)表面形貌；(b)截面形貌

Fig.6 950 ℃/400 h静态氧化后TGO形貌
(a)P；(b)280S；(c)60S；(d)S

Fig.7 280S涂层950 ℃/400 h静态氧化后界面形貌(a)和EDS分析(b)

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