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

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...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Journal of the European Ceramic Society 2025-04, Vol.45 (4), p.117102, Article 117102
Hauptverfasser: Xue, Zhaolu, Mei, Jiao, Li, Fei, Zhu, Yong, He, Jian, Zhang, Zhenya, Zhou, Bangyang, Gyawali, Gobinda, Zhang, Shihong
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung: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.
ISSN:0955-2219
DOI:10.1016/j.jeurceramsoc.2024.117102