Phase evolution and high-temperature stability of HfSiO4 bond coat for ultra-high temperature environmental barrier coatings

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS Journal of The European Ceramic Society Pub Date : 2024-11-23 DOI:10.1016/j.jeurceramsoc.2024.117102

Zhaolu Xue , Jiao Mei , Fei Li , Yong Zhu , Jian He , Zhenya Zhang , Bangyang Zhou , Gobinda Gyawali , Shihong Zhang

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Abstract

In this paper, in order to solve the problem of SiO₂ volatilization in the plasma spraying HfSiO₄, HfO₂-SiO₂ feedstock powder and coatings with different molar ratio were fabricated by spraying granulation and atmospheric plasma spraying, respectively. The content of each phase was quantified using Rietveld refinement. The results showed that HfO₂-SiO₂ feedstock powder exhibited good homogeneity, sphericity, and fluidity. Most of the spraying powder was melted, and five HfO₂-SiO₂ coatings were all composed of m-HfO₂, α-SiO₂ and amorphous phases. A significant amount of HfSiO₄ grains were precipitated in the coating after heat treatment at 1550 °C, and the content of HfSiO₄ increased with the SiO₂ content rising. HfSiO₄ content was up to 97.78 mol% in the HfO₂/SiO₂ (1:1.6) coating with the remaining HfO₂ phase. HfO₂/SiO₂ (1:1.6) coating has good high-temperature phase stability at 1550 °C, and is one of the ideal bond coat for ultra-high temperature EBC system.

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用于超高温环境阻隔涂层的 HfSiO4 键合涂层的相变和高温稳定性

本文为了解决等离子喷涂 HfSiO4 中 SiO2 的挥发问题，分别采用喷涂造粒和常压等离子喷涂的方法制备了不同摩尔比的 HfO2-SiO2 原料粉末和涂层。采用里特维尔德细化法对各相的含量进行了量化。结果表明，HfO2-SiO2 原料粉末具有良好的均匀性、球形度和流动性。大部分喷涂粉末被熔化，五层 HfO2-SiO2 涂层均由 m-HfO2、α-SiO2 和无定形相组成。1550 ℃热处理后，涂层中析出了大量的 HfSiO4 晶粒，随着 SiO2 含量的增加，HfSiO4 的含量也在增加。在 HfO2/SiO2 (1:1.6) 镀层中，HfSiO4 含量高达 97.78 mol%，其余为 HfO2 相。HfO2/SiO2 (1:1.6) 涂层在 1550 ℃ 时具有良好的高温相稳定性，是超高温 EBC 系统理想的结合涂层之一。

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来源期刊

Journal of The European Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

10.70

自引率

12.30%

发文量

863

审稿时长

35 days

期刊介绍： The Journal of the European Ceramic Society publishes the results of original research and reviews relating to ceramic materials. Papers of either an experimental or theoretical character will be welcomed on a fully international basis. The emphasis is on novel generic science concerning the relationships between processing, microstructure and properties of polycrystalline ceramics consolidated at high temperature. Papers may relate to any of the conventional categories of ceramic: structural, functional, traditional or composite. The central objective is to sustain a high standard of research quality by means of appropriate reviewing procedures.