Corrosion resistance of non-stoichiometric gadolinium zirconate fabricated by laser-enhanced chemical vapor deposition

• 作者: Chengguan ZHANG Yun FAN Juanli ZHAO Guang YANG Hongfei CHEN Liangmiao ZHANG Yanfeng GAO Bin LIU
• 来源期刊: 先进陶瓷（英文版）
• 年，卷（期）: 2021,（3）
• 所属期刊栏目: Research Article
• 页码范围: 520-528
• 页数: 9页
• 语种: 英文

摘要

Gadolinium zirconate (GZ) is a promising candidate for next-generation thermal barrier coating (TBC) materials.Its corrosion resistance against calcium-magnesium-alumino-silicate(CMAS) needs to be further increased for enhancing its in-service life.As the Gd element plays an important role in the CMAS resistance,three GZ coatings (GZ-0.75,GZ-1.0,and GZ-1.2) with different Gd/Zr atomic ratios are designed and deposited by laser enhanced chemical vapor deposition(LCVD) in this work.It is found that the generated Gd-apatite in GZ-1.2 would block micro-cracks inside the column structure and the inter-columnar gap more efficiently.Thus,the CMAS penetration rate (5.2 μm/h) of GZ-1.2 decreases over 27％ comparing with GZ-1.0 and GZ-0.75,which is even lower than the Gd2Zr2O7 coatings fabricated by electron-beam physical vapor depositions (EB-PVDs).This work provides a feasible way to adjust the coating's corrosion resistance and may guide the development of future coating for long in-service life.