Chemical compatibility of rare earth apatite with yttria-stabilized zirconia. Issue 3 (March 2021)

• Record Type: Journal Article
• Authors: Zhang, Han; Lu, Jie; Luo, Lirong; Zhao, Xiaofeng; Guo, Fangwei; Xiao, Ping
• Is Part Of: Journal of the European Ceramic Society. Volume 41:Issue 3(2021)
• Page Start: 1995
• Page End: 2001
• Publication Date: 2021-03
• Subjects: Chemical compatibility -- Apatite/YSZ -- Composite -- Thermal barrier coatings (TBCs); Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2020.10.043
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: The chemical compatibility of a series of rare earth apatite (RE-apatite), with Y2 O3 -stabilized ZrO2 (YSZ) has been investigated. Three types of RE-apatite powders with different ionic radius (RE = Gd, Nd and La) were prepared, and bulks prepared from the powder mixtures of RE-apatite and YSZ were heat-treated at 1300 °C up to 100 h in this study. It was found that Gd-apatite reacted with YSZ and formed a reaction layer (Gd2 Si2 O7 ) at the Gd-apatite/YSZ interface. Meanwhile, the intense Gd 3+ diffusion resulted in the formation of Gd solid solutions in YSZ and much YSZ phase transformation. In contrary, as for Nd- or La-apatite/YSZ composite, which has larger ionic radius, no reaction product was observed at interface and there was less RE diffusion into YSZ as well as YSZ transformation. These results clearly indicated that large ionic radius of RE 3+ could enhance the chemical compatibility of RE-apatite with YSZ.