Comparing the thermal stability of high thermal compliant YSZ coatings deposited by APS, SPS and PS-PVD

Tuesday, May 28, 2019: 16:30
Annex Hall/F201 (Pacifico Yokohama)
Prof. Shunyan Tao , Shanghai Institute of Ceramics, Chinese Academy of Sciences, shanghai, China
Dr. Jiasheng Yang , Shanghai Institute of Ceramics, Chinese Academy of Sciences, shanghai, China
Mr. Huayu Zhao , Shanghai Institute of Ceramics, Chinese Academy of Sciences, shanghai, China
Mr. Yuexing Zhao , Shanghai Institute of Ceramics, Chinese Academy of Sciences, shanghai, China
Mr. Minglong Zhai , Shanghai Institute of Ceramics, Chinese Academy of Sciences, shanghai, China
Mr. Yin Zhuang , Shanghai Institute of Ceramics, Chinese Academy of Sciences, shanghai, China
Mr. Jinxing Ni , Shanghai Institute of Ceramics, Chinese Academy of Sciences, shanghai, China
Dr. X.H Zhong , Shanghai Institute of Ceramics, Chinese Academy of Sciences, shanghai, China
Abstract: In this work, substrate-free segmentation-crack and columnar structured high thermal compliant YSZ thermal barrier coatings (TBCs) were deposited by atmospheric plasma spraying (APS), suspension plasma spraying (SPS) and plasma spray - physical vapor deposition (PS-PVD), respectively. YSZ coatings were heat treated from 1200℃ to 1600℃ for 20h to 100h. Thermal stability behavior of TBCs such as phase content, grain growth rate, porosity decrease, Young’s modulus and micro-hardness increase after thermal exposure were investigated. Results illustrating that three kinds of as-deposited YSZ coatings via APS, SPS and PS-PVD are all in the metastable, non-transformable tetragonal (t’) phases. After 1550℃/40 h thermal exposure, however, tetragonal-monoclinic phase transformation occurred and the monoclinic content increased depend on exposure time. Influence of coating defects on thermal-mechanical properties and complex interplay between crack healing, porosity decrease, sintering and crystallite growth in governing thermal conductivity are summarized.

Keywords: thermal barrier coating, atmospheric plasma spray, suspension plasma spray, plasma spray-physical vapor deposition, columnar structure, segmentation-crack

See more of: Thermal Barrier Coatings
See more of: Applications