镀铝表面改性7YSZ纳米热障涂层热震性能分

doi:10.15541/jim20160661

无机材料学报 ›› 2017, Vol. 32 ›› Issue (9): 973-979.DOI: 10.15541/jim20160661

镀铝表面改性7YSZ纳米热障涂层热震性能分

张小锋^{1, 2}, 周克崧^{1, 2}, 刘敏², 邓春明², 邓畅光², 陈焕涛²

(1. 华南理工大学材料科学与工程学院, 广州510640; 2. 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及广东省现代表面工程技术重点实验室, 广州510650)

收稿日期:2016-11-28 修回日期:2017-01-17 出版日期:2017-09-30 网络出版日期:2017-08-29
基金资助:
广东省科学院项目(2017GDASCX-0843);广东省科技计划项目(201313050800031, 201413050502008, 2014B070706026, 2013B061800053);广东省自然科学基金团队项目(2016A030312015)

Thermal Shock Analysis of Surface Al-modified 7YSZ Nano-thermal Barrier Coatin

ZHANG Xiao-Feng^{1, 2}, ZHOU Ke-Song^{1, 2}, LIU Min², DENG Chun-Ming², DENG Chang-Guang², CHEN Huan-Tao²

(1. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China; 2. National Engineering Laboratory for Modern Materials Surface Engineering Technology & The Key Lab of Guangdong for Modern Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou 510650, China)

Received:2016-11-28 Revised:2017-01-17 Published:2017-09-30 Online:2017-08-29
Supported by:
Guangdong Academy of Sciences (2017GDASCX-0843);Guangdong Technical Research Program (201313050800031, 201413050502008, 2014B070706026, 2013B061800053);Guangdong Natural Science Foundation (2016A030312015)

摘要/Abstract

摘要：

为提高7YSZ纳米热障涂层的热震性能, 实验中采用超音速火焰喷涂(HVOF)在涡轮叶片模拟工件上制备了粘结层NiCrCrAlYTa, 再使用大气等离子喷涂(APS)在粘结层上制备了7YSZ纳米陶瓷层。采用磁控溅射在7YSZ热障涂层样品表面镀铝, 并在不同压力下(200、250、300 Pa)对镀铝样品进行热处理表面改性。对喷涂态样品和镀铝改性后样品进行水淬热震实验, 1050℃保温10 min+水冷5 min为一个热循环, 观察热障涂层镀铝改性前后样品在水淬热循环过程中形貌和结构演变。实验结果表明, 镀铝改性后样品表面存在铝薄膜蒸发、凝固后形成的疏松纳米Al晶粒表层以及由Al和ZrO₂原位反应形成的致密α-Al₂O₃底层。在镀铝样品热处理过程中, 随着压力升高, 疏松层致密度逐渐增加。不同热处理压力下镀铝表面改性后样品经过73次水淬热循环后剥落面积均小于喷涂态样品, 显示出良好的抗热震性。

关键词: 热障涂层, 7YSZ, 热震性能, 镀铝改性

Abstract:

In order to improve the thermal shock resistance of 7YSZ nano-thermal barrier coating (TBC), bond coating NiCoCrAlYTa was prepared on simulated turbine blade by HVOF (high velocity oxygen flame). Subsequently, 7YSZ nano-ceramic coating was produced on bond coating as top coating. Al film was deposited on the surface of TBC samples. Then the Al-deposited TBCs were carried out by heat-treatment at different pressures (200, 250, 300 Pa). After that, the thermal shock tests of as-sprayed and Al-modified 7YSZ nano-TBC were taken from 1050 ℃ to atmospheric water with holding time of 10 and 5 min, respectively. Micrograph and microstructure evolution of the TBC sample were characterized before and after thermal shock. The results show that a loose top layer with Al nano-grains is formed on the TBC surface due to evaporation and condensation of Al film at vacuum pressure. Besides, with increase of heat-treatment pressure, the density of loose layer is increased. A dense Al₂O₃ layer was in-situ synthesized under the loose layer due to the reaction of Al and ZrO₂. The Al-modified 7YSZ nano-TBCs heat-treated at different pressures has less spallation area than the as-sprayed TBCs after withstood 73 thermal shocks, showing better thermal shock resistance.

Key words: thermal barrier coating, 7YSZ, thermal cycle, Al-modification

中图分类号:

TQ174

张小锋, 周克崧, 刘敏, 邓春明, 邓畅光, 陈焕涛. 镀铝表面改性7YSZ纳米热障涂层热震性能分[J]. 无机材料学报, 2017, 32(9): 973-979.

ZHANG Xiao-Feng, ZHOU Ke-Song, LIU Min, DENG Chun-Ming, DENG Chang-Guang, CHEN Huan-Tao. Thermal Shock Analysis of Surface Al-modified 7YSZ Nano-thermal Barrier Coatin[J]. Journal of Inorganic Materials, 2017, 32(9): 973-979.

图/表 8

图1 涡轮叶片模拟样品

Fig. 1 Turbine blade simulated sample

图2 7YSZ纳米热障涂层镀铝前后的形貌变化

Fig. 2 7YSZ nano-TBC microgrsphy before and after Al-modification (a-c) As-sprayed TBC: surface, un-polished cross-section, polished cross-section; (d-f) Al-modified TBC at 200 Pa: surface, un-polished cross-section, polished cross-section

图3 (a)喷涂态7YSZ纳米涂层和(b)镀铝改性后7YSZ纳米涂层的XRD图谱

Fig. 3 XRD patterns of (a) as-sprayed 7YSZ nano-coating and (b) Al-modified 7YSZ nano-coating

图4 热障涂层镀铝表面改性工艺示意图

Fig. 4 Schematic diagram of surface Al-modification process in TBC

图5 不同热处理压力下玻璃试片表面Al晶粒形貌

Fig. 5 Images of Al grains on the glass at different heat-treatment pressures

图6 7YSZ纳米热障涂层镀铝改性示意图

Fig. 6 Schematic diagram of Al-modified 7YSZ nano-TBC (a) Before Al-modification; (b) After Al-modification

图7 喷涂态和不同压力下镀铝改性后纳米热障涂层样品经73次热震后宏观形貌

Fig. 7 Macrographs of as-sprayed and Al-modified 7YSZ nano-TBC after 73 thermal shocks (a) Front ; (b) Behind

图8 7YSZ纳米热障涂层经73次热循环后涂层表面微观形貌

Fig. 8 Micrographs of 7YSZ nano-TBC after 73 thermal shocks (a) As-sprayed TBC; (b) Al-modified TBC

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镀铝表面改性7YSZ纳米热障涂层热震性能分

Thermal Shock Analysis of Surface Al-modified 7YSZ Nano-thermal Barrier Coatin

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