| 激光重熔改性热障涂层抗CMAS腐蚀特性 |
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| 引用本文： | 赵长浩,杨玲伟,肖学仁,张军,潘伟.激光重熔改性热障涂层抗CMAS腐蚀特性[J].航空材料学报,2022,42(1):40-49. |
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| 作者姓名： | 赵长浩 杨玲伟 肖学仁 张军 潘伟 |
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| 作者单位： | 中国空气动力研究与发展中心超高速空气动力研究所, 四川 绵阳 621000;清华大学 新型陶瓷与精细工艺国家重点实验室, 北京 100084,中国空气动力研究与发展中心超高速空气动力研究所, 四川 绵阳 621000,清华大学 新型陶瓷与精细工艺国家重点实验室, 北京 100084 |
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| 基金项目： | 国家自然科学基金项目（91960104，51472135）%中国空气动力研究与发展中心基础前沿项目（KT-JCQY-2019-012） |
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| 摘 要： | 采用激光对大气等离子喷涂7YSZ热障涂层进行表面重熔处理,探讨基体预热和Al2O3溶胶涂敷对激光重熔层裂纹愈合的影响,研究处理后热障涂层的耐CMAS熔盐腐蚀性能。结果表明:涂层经过激光重熔和基体预热后的激光重熔处理后,与未经重熔处理涂层的CMAS腐蚀厚度基本相同;而采用表面Al2O3溶胶涂敷加激光重熔的热障涂层的CMAS腐蚀厚度明显减小,表明Al2O3溶胶涂敷加激光重熔工艺可以有效地减轻CMAS熔盐侵蚀,其机理是表面形成的Al2O3薄膜溶于CMAS后生成了难熔晶体钙长石,降低了熔盐的流动性和腐蚀性。
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| 关 键 词： | 激光重熔 热障涂层 Al2O3溶胶涂覆 CMAS腐蚀 |
Improving molten CMAS resistance of thermal barrier coatings by modified laser remelting method |
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| ZHAO Changhao,YANG Lingwei,XIAO Xueren,ZHANG Jun,PAN Wei.Improving molten CMAS resistance of thermal barrier coatings by modified laser remelting method[J].Journal of Aeronautical Materials,2022,42(1):40-49. |
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| Authors: | ZHAO Changhao YANG Lingwei XIAO Xueren ZHANG Jun PAN Wei |
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| Institution: | (Hypervelocity Aerodynamics Institute,China Aerodynamics Research and Development Center,Mianyang 621000,Sichuan,China;State Key Laboratory of New Ceramics and Fine Processing,Tsinghua University,Beijing 100084,China) |
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| Abstract: | 7% yttria stabilized zirconia (7YSZ) thermal barrier coatings (TBCs) prepared by air plasma spray were laser-remelted, and subsequently pre-heated and Al2O3 sol-gel repaired for restraining the crack growth in the remelted coatings. The as-prepared coatings were exposed to high temperature molten CaO-MgO-Al2O3-SiO2 (CMAS) to explore their corrosion resistance. The results show that both the laser remelted and the pre-heated, the laser-remelted coatings are densified by CMAS attack. In addition, the thickness of the densified layers is on the same order of that of the non-remelted coatings. Despite of this, the densified layer in the laser remelted coating repaired by Al2O3 sol-gel is much thinner than the other coatings. This indicates that Al2O3 sol-gel repairing coupling with laser-remelted method can effectively improve the CMAS resistance of 7YSZ TBCs due to the refractory anorthite generated during corrosion process. This refractory compound produced between CMAS and Al2O3 sol-gel is capable to decrease the mobility and corrosivity of the CMAS. |
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| Keywords: | laser remelted thermal barrier coatings sol-gel repairing CMAS corrosion |
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