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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(英文)
Nano-composite Structured Environmental Barrier Coatings Prepared by Plasma Spray-Physical Vapor Deposition and Their Thermal Cycle Performance
【摘要】 在SiC/SiC陶瓷基复合材料(CMC)上制备了具有3层结构(Si/Mullite/Yb2SiO5)的环境障涂层(EBCs)。提出了一种新的等离子喷涂-物理气相沉积(PS-PVD)方法制备EBCs以减少Si C/Si C CMC在水氧腐蚀下的降解。在制备EBCs之前,用喷雾干燥塔制备了团聚的Yb2SiO5粉末。然后通过PS-PVD技术制备了致密的EBCs,得到了具有层状和柱状复合结构的Yb2SiO5涂层,并给出了这种特殊结构的沉积示意图。此外,测试了PS-PVD制备的EBCs在1300℃到室温水中的热循环性能。在30次热循环实验后未出现明显的散裂现象,表明EBCs具有良好的抗热震性能。
【Abstract】 Environmental barrier coatings(EBCs) consisting of a tri-layer structure(Si/mullite/Yb2SiO5) were prepared on Si C/Si C ceramic matrix composite(CMC). For decreasing the degradation of water-oxygen corrosion of Si C/Si C 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 1300 ℃ 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.
- 【文献出处】 稀有金属材料与工程 ,Rare Metal Materials and Engineering , 编辑部邮箱 ,2019年11期
- 【分类号】TB306
- 【被引频次】9
- 【下载频次】270