Water vapor and CMAS corrosion tests of Y2SiO5/Si thermal and environmental barrier coating
Qi Zhang,
Xueqin Zhang,
Zhuang Ma,
Ling Liu,
Yanbo Liu,
Wei Zheng
Affiliations
Qi Zhang
School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China; Beijing Institute of Technology Chongqing Innovation Center, Chongqing 401120, China
Xueqin Zhang
School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China; Beijing Institute of Technology Chongqing Innovation Center, Chongqing 401120, China
Zhuang Ma
School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China; Beijing Institute of Technology Chongqing Innovation Center, Chongqing 401120, China
Ling Liu
School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China; Beijing Institute of Technology Chongqing Innovation Center, Chongqing 401120, China; Corresponding author.
Yanbo Liu
School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China; Beijing Institute of Technology Chongqing Innovation Center, Chongqing 401120, China; Corresponding author.
Wei Zheng
School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
Thermal and environmental barrier coatings (TEBCs), an up-to-date concept, are introduced to protect silicon-based ceramic matrix composites (CMCs) from not only high-temperature water vapor but also alkali salts from volcanic ash and dust suspended in the atmosphere. Both high-temperature steam and CMAS will cause Si-based CMCs to deteriorate rapidly. By executing the corrosion test against high-temperature water vapor, we find that the Y2SiO5/Si double-layer TEBC can effectively protect SiCf/SiC CMCs from water vapor at 1300 °C for over 205 h. Almost all Y2SiO5 transforms into Y4.67(SiO4)3O after the corrosion test. It is also found that in the CMAS corrosion test, the reaction zone formed between the CMAS and Y2SiO5 layers prevents the mutual diffusion of elements in the CMAS and Y2SiO5 layers. The apparent activation energy of the reaction between CMAS and Y2SiO5 in the 1200–1300 °C temperature range is calculated to be 713.749 kJ/mol. These findings provide a reference for selecting appropriate materials for TEBCs.
