Nano-composite Structured Environmental Barrier Coatings Prepared by Plasma Spray-Physical Vapor Deposition and Their Thermal Cycle Performance [等离子喷涂-物理气相沉积制备纳米复合结构环境障涂层及其热循环性能]

作者：Wang C.; Zhang X.^*; Zhou K.; Liu M.; Deng C.; Deng C.; Niu S.; Xu S.; Chen Z.; Zeng W.

来源：Rare Metal Materials and Engineering, 2019, 48(11): 3455-3462.

• EBCs
• PS-PVD
• Thermal cycle
• Yb2SiO5 coating

Environmental barrier coatings (EBCs) consisting of a tri-layer structure (Si/mullite/Yb2SiO5) were prepared on SiC/SiC ceramic matrix composite (CMC). For decreasing the degradation of water-oxygen corrosion of SiC/SiC CMC, a novel EBCs fabrication method of plasma spray-physical vapor deposition (PS-PVD) was proposed in this work. Prior to EBCs preparation, agglomerated Yb2SiO5 powders was fabricated by spray dryer. After that, dense EBCs were fabricated by PS-PVD technique, where the Yb2SiO5 coating with laminar and columnar composited structure was achieved. And the deposition diagram of this special structure was presented. Besides, the thermal cycle performance of PS-PVD EBCs was tested from 1300oC to room temperature in water. Results show that no apparent spallation appears after 30 cycles, indicating that the EBCs have a good thermal shock performance.

• 单位
  华南理工大学