Interface evolution of Si/Mullite/Yb2SiO5 PS-PVD environmental barrier coatings under high temperature

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

2 Scopus Citations
View graph of relations

Author(s)

  • Xiaofeng Zhang
  • Jinbing Song
  • Ziqian Deng
  • Chao Wang
  • Shaopeng Niu
  • Chunming Deng
  • Changguang Deng
  • Min Liu
  • Kesong Zhou

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)1478-1487
Journal / PublicationJournal of the European Ceramic Society
Volume40
Issue number4
Online published4 Nov 2019
Publication statusPublished - Apr 2020

Abstract

Plasma spray-physical vapor deposition (PS-PVD) was used to prepare tri-layer environmental barrier coatings (EBCs) Si/mullite/Yb2SiO5 on SiCf/SiC substrate. Isothermal oxidation tests of EBCs were performed at 1300 ℃ for 1000 h. The thermochemical and thermomechanical interface interaction among EBCs were investigated. The results show that more dense EBCs can be obtained through PS-PVD process, which is attributed to the mixed deposition of liquid/gas states. After isothermal oxidation, many pores were observed in the Yb2SiO5 coating near the interface of Yb2SiO5/mullite coating, which results from the diffusion of Yb2O3 phase dissociated from Yb2SiO5 into mullite coating at high temperature. In the mullite coating, the Yb2O3 reacted with Al2O3 generating rod-like Yb3Al5O12 phase. Additionally, due to the thermal expansion mismatch and high temperature oxidation, cracks were formed at the interfaces of mullite/Si coating. Those interface cracks resulted in buckling in the mullite coating.

Research Area(s)

  • EBCs, Interface reaction, Isothermal oxidation, PS-PVD

Citation Format(s)

Interface evolution of Si/Mullite/Yb2SiO5 PS-PVD environmental barrier coatings under high temperature. / Zhang, Xiaofeng; Song, Jinbing; Deng, Ziqian; Wang, Chao; Niu, Shaopeng; Liu, Guo; Deng, Chunming; Deng, Changguang; Liu, Min; Zhou, Kesong; Lu, Jian.

In: Journal of the European Ceramic Society, Vol. 40, No. 4, 04.2020, p. 1478-1487.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal