Si/3Al2O3·2SiO2+BSAS/Yb2SiO5环境障涂层13000℃抗水蒸气性能研究

材料工程, 2011, (7): 34-43. doi: 10.3969/j.issn.1001-4381.2011.07.008

Si/3Al2O3·2SiO2+BSAS/Yb2SiO5环境障涂层13000℃抗水蒸气性能研究

贺世美 ^1, , 牟仁德 ^2, , 许振华 ^3, , 何利民 ^4, , 黄光宏 ^5,

1.北京航空材料研究院,北京100095;中南大学粉末冶金国家重点实验室,长沙410083

2.北京航空材料研究院,北京100095

3.北京航空材料研究院,北京100095

4.北京航空材料研究院,北京100095

5.北京航空材料研究院,北京100095

关键词： Yb2SiO5 , 环境障涂层 , 水蒸气 , 失效

Study of Water Vapor Corrosion at 1300℃ of Si/3Al2O3·2SiO2+BSAS/Yb2SiO5 Environmental Barrier Coatings

采用电子束物理气相沉积和等离子喷涂工艺在Cf/SiC基体上制备了Si/3Al2O3·2SiO2+BSAS/Yb2SiO5环境障涂层(Environmental Barrier Coatings,EBC),研究了在1300℃、1.013×105Pa、气体流速为0.54m/s的水蒸气环境中Cf/SiC基体和EBC涂层的抗水蒸气性能.结果表明:涂覆Si/3Al2O3·2SiO2+BSAS/Yb2SiO5EBC的Cf/SiC试样,在实验进行到175h时开始出现失重,实验过程中生成的Yb(OH)3和Si(OH)4气体不断地挥发是造成Yb2SiO5面层变薄并导致试样失重的主要原因;同时,3Al2O3·2SiO2+BSAS中间层内Ba,Sr,Al元素的向外扩散、Yb2SiO5面层中的Yb元素向内扩散,以及EBC涂层内存在的残余应力是导致EBC发生失效的主要原因.

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