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原慷,侯伟骜,冀晓鹃,卢晓亮.热冲击条件下硅酸镱环境障涂层组织演变研究[J].热喷涂技术,2023,(1):13~18.

热冲击条件下硅酸镱环境障涂层组织演变研究

Study on Microstructure Evolution in Ytterbium SilicateEnvironmental Barrier Coatings under Thermal Shock Tests

DOI：10.3969/j.issn.1674-7127.2023.01-002

英文关键词:EBC Plasma spray Thermal shock Water-vapor corrosion Phase transformation

基金项目:

作者	单位
原慷	矿冶科技集团有限公司北京市工业部件表面强化与修复工程技术研究中心北矿新材科技有限公司
侯伟骜	矿冶科技集团有限公司北京市工业部件表面强化与修复工程技术研究中心北矿新材科技有限公司
冀晓鹃	矿冶科技集团有限公司北京市工业部件表面强化与修复工程技术研究中心北矿新材科技有限公司
卢晓亮	矿冶科技集团有限公司北京市工业部件表面强化与修复工程技术研究中心北矿新材科技有限公司

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中文摘要:

硅酸镱是重要的环境障涂层 (EBC) 材料，本文采用等离子喷涂方法制备硅酸镱涂层，对其进行了热冲击考核，包括纯燃气和含钙离子水汽热冲击，并初步研究了经过热冲击的涂层组织演变行为。结果表明，高温下双硅酸镱相容易发生向单硅酸镱相的转变，这可能是因为涂层材料和水汽发生了反应。在 1350 ℃燃气环境下，涂层表层发生了明显的烧结现象。在含钙离子水汽热冲击（加热温度 1250 ℃）条件下，硅酸镱涂层表层形成了鼓泡特征，同时受到了钙离子腐蚀。本文通过对涂层显微组织的分析，提供了可能的组织演变与化学反应机制。

英文摘要:

Ytterbium silicate is an important material for environmental barrier coatings (EBC). In this paper, ytterbium silicate coatings were prepared by plasma spraying processes. The coatings were subjected to thermal shock tests under different conditions including gas-burning testing and water-vapor-burning testing with calcium ion. The microstructure evolution behavior of coatings subjected to the tests was studied. The results showed that the phase transformation from ytterbium disilicate to ytterbium monosilicate easily occurred at high temperatures, which may be due to the reaction between the material and water vapor. In the hot gas environment at 1350 ℃ , obvious sintering phenomenon occurred on the surface layer of the coating. Under the water-vapor-burning condition (heating temperature 1250 ℃ ) which contained calcium ion, the surface layer of the ytterbium silicate coating showed bubbling characteristics and was subjected to calcium ion corrosion. Possible chemical reaction mechanisms as provided for the microstructure evolution of the coatings.

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