激光重熔改性热障涂层抗CMAS腐蚀特性
Improving molten CMAS resistance of thermal barrier coatings by modified laser remelting method
查看参考文献37篇
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文摘
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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Al_2O_3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Al_2O_3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Al_2O_3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Al_2O_3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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其他语种文摘
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7% yttria stabilized zirconia (7YSZ) thermal barrier coatings (TBCs) prepared by air plasma spray were laser-remelted, and subsequently pre-heated and Al_2O_3 sol-gel repaired for restraining the crack growth in the remelted coatings. The as-prepared coatings were exposed to high temperature molten CaO-MgO-Al_2O_3-SiO_2 (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 Al_2O_3 sol-gel is much thinner than the other coatings. This indicates that Al_2O_3 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 Al_2O_3 sol-gel is capable to decrease the mobility and corrosivity of the CMAS. |
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来源
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航空材料学报
,2022,42(1):40-49 【核心库】
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DOI
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10.11868/j.issn.1005-5053.2021.000140
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关键词
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激光重熔
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热障涂层
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Al_2O_3溶胶涂覆
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CMAS腐蚀
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地址
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1.
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
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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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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1005-5053 |
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学科
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航空 |
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基金
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国家自然科学基金
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中国空气动力研究与发展中心基础前沿项目
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文献收藏号
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CSCD:7182251
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