高温热暴露对等离子喷涂YSZ孔隙结构和力学性能的影响

doi:10.11896/cldb.23110217

材料导报

2025, Vol. 39

Issue (4): 23110217-7 https://doi.org/10.11896/cldb.23110217

金属与金属基复合材料

高温热暴露对等离子喷涂YSZ孔隙结构和力学性能的影响

王喆锦, 王丽爽^*, 麻忠宇, 董会, 姚建洮, 周勇

西安石油大学材料科学与工程学院,西安市高性能油气田材料重点实验室,油气田腐蚀防护与新材料陕西省高等学校重点实验室,西安 710065

Effect of High Temperature Thermal Exposure on Pore Structure and Mechanical Properties of Plasma Sprayed YSZ

WANG Zhejin, WANG Lishuang^*, MA Zhongyu, DONG Hui, YAO Jiantao, ZHOU Yong

Xi’an Key Laboratory of High Performance Materials for Oil and Gas Fields, Key Laboratory of Corrosion Protection and New Materials for Oil and Gas Fields, School of Material Science and Engineering, Xi’an Shiyou University, Xi’an 710065, China

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摘要采用大气等离子喷涂工艺在不同喷涂距离下制备YSZ涂层,并在1 300 ℃下进行不同时间高温热暴露。表征了喷涂态以及热暴露过程中涂层微观结构(表观孔隙率、2D孔隙密度、3D孔隙率)和力学性能(硬度、弹性模量)的变化。结果表明,当喷涂距离增大时,喷涂态涂层内部表观孔隙率、2D孔隙密度以及3D孔隙率均增大,且涂层中3D孔隙占比增大。对于同一喷涂距离的涂层,高温热暴露后,3D孔隙率变化较小,表观孔隙率和2D孔隙密度显著下降,涂层硬度和弹性模量显著增加。涂层硬度、弹性模量、表观孔隙率和2D孔隙密度随热暴露时间变化均呈现双阶段演变过程,0~20 h变化显著,20~100 h变化逐渐缓慢。涂层相结构分析表明,热暴露期间涂层相结构并未发生明显变化。涂层在高温下热暴露100 h后,表观孔隙率和2D孔隙密度约分别降低35.8%和68.2%,涂层硬度和弹性模量约分别增加78.5%和81%,3D孔隙约降低8.6%。热暴露过程中2D孔隙愈合主导了涂层的烧结致密化,最终导致涂层力学性能发生变化。随着喷涂距离增加3D孔隙占比增大,热暴露后涂层硬度及弹性模量的增量减少。因此,当涂层内部3D孔隙占比越多时,涂层抗烧结能力增强。

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	王喆锦
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关键词: 等离子喷涂YSZ 热障涂层热暴露孔隙结构力学性能

Abstract: YSZ coatings were prepared by atmospheric plasma spray (APS) at different spraying distances and exposed to high temperature at 1 300 ℃ for different hours. The microstructure (apparent porosity, 2D porosity and 3D porosity) and mechanical properties (hardness and elastic modulus) of the YSZ coatings before and after thermal exposure were characterized. The results show that the apparent porosity, 2D pore density and 3D porosity of as-deposited coatings increased with the increase of spray distance, and the proportion of 3D pores in the coating increases. The apparent porosity and 2D porosity density of YSZ coatings deposited at the same spray distance decreased significantly and the 3D porosity remained stable after high temperature thermal exposure. Accordingly, the hardness and elastic modulus of YSZ coating after high temperature thermal exposure also increased significantly. Hardness, elastic modulus, apparent porosity and 2D pore density of coatings showed a two-stage evolution process during thermal exposure. All of them changed greatly from 0 h to 20 h, and changed slowly from 20 h to 100 h. Phase structure of coatings after thermal exposure was similar with as-deposited coatings. After 100 h thermal exposure, the apparent porosity and 2D porosity density decreased by about 35.8% and 68.2%, the hardness and elastic modulus increased by about 78.5% and 81%, respectively, by comparison, the 3D porosity decreased by only 8.6%. The healing of 2D pore during thermal exposure dominated the sintering densification of the coating. As a result, the mechanical properties of the coating changed. With the increase of spraying distance, the increase of 3D porosity increases, and the increment of coating hardness and elastic modulus decreases after thermal exposure. Therefore, the proportion of 3D pores in the coating is more, the better the anti-sintering performance of APS YSZ coatings.

Key words: plasma spraying YSZ thermal barrier coating thermal exposure pore structure mechanical property

出版日期: 2025-02-25 发布日期: 2025-02-18

ZTFLH:

TG174.4

基金资助: 国家自然科学基金(51901181);陕西省摩擦焊接重点实验室开放课题,西安石油大学研究生创新与实践能力培养计划资助项目(YCS21212137)

通讯作者: *王丽爽,西安石油大学材料科学与工程学院副教授、硕士研究生导师。主要研究方向包括热障涂层的结构调控、隔热性能和抗腐蚀性能以及长寿命服役性能,同时在多孔/致密功能涂层的低温制备领域也有一定的研究。lswang@xsyu.edu.cn

作者简介: 王喆锦,西安石油大学材料科学与工程学院硕士研究生,在王丽爽副教授的指导下进行研究。目前主要研究领域为热喷涂方向。

引用本文:

王喆锦, 王丽爽, 麻忠宇, 董会, 姚建洮, 周勇. 高温热暴露对等离子喷涂YSZ孔隙结构和力学性能的影响[J]. 材料导报, 2025, 39(4): 23110217-7.
WANG Zhejin, WANG Lishuang, MA Zhongyu, DONG Hui, YAO Jiantao, ZHOU Yong. Effect of High Temperature Thermal Exposure on Pore Structure and Mechanical Properties of Plasma Sprayed YSZ. Materials Reports, 2025, 39(4): 23110217-7.

链接本文:

https://www.mater-rep.com/CN/10.11896/cldb.23110217 或 https://www.mater-rep.com/CN/Y2025/V39/I4/23110217

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