全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...
材料工程  2011 

Si/3Al2O3·2SiO2+BSAS/Yb2SiO5环境障涂层1300℃抗水蒸气性能研究

Keywords: Yb2SiO5,环境障涂层,水蒸气,失效

Full-Text   Cite this paper   Add to My Lib

Abstract:

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(EnvironmentalBarrierCoatings,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。

References

[1]  周长城,张长瑞,胡海峰,等.Cf/SiC复合材料制备工艺研究[J]材料导报,2007,21(2):148-150.
[2]  LEE K N,ELDRIDGE J,ROBINSON R C.Residual stress and their effects on the durability of environmental barrier coatings for SiC ceramics[J]Journal of the American Ceramic Society,2005,88(12):3483-3488.
[3]  MENON M N,FANG H T,WU D C,et al.Creep and stress rupture behavior of an advanced silicon nitride[J]Journal of the American Ceramic Society,1994,77(5):1217-1241.
[4]  GASDASKA C J.Tensile creep in an in situ reinforced silicon nitride[J]Journal of the American Ceramic Society,1994,77(9):2408-2418.
[5]  RENDTEL A,HUBNER H,HERRMANN M,et al.Si3N3/SiC nanocomposite materials:Ⅱ.Hot strength,creep,and oxidation resistance CJ]Journal of the American Ceramic Society,1998,81(5):1109-1120.
[6]  KLEMM H,SCHUBERT C.Silicon nitride/molybdenum disilicide composite with superior long-term oxidation resistance at 1500 ℃[J]Journal of the American Ceramic Society,2001,84(10):2430-2432.
[7]  BHATIA T,EATON H,SUN E,et al.Advanced environmental barrier coatings for SiC/SiC composites[A]Proceeding of GT2005[C]Nevada:Reno-Tahoe,2005.1-6.
[8]  LEE K N,DENNIS S,NAROTTAM P.Rare earth silicate environmental barrier coatings for SiC/SiC composites and Si3N4 ceramics[J]Journal of the European Ceramic Society,2005,26(10);1705-1715.
[9]  SHUNKICHI U,TATSUKI O,HUA L.Recession behavior of Yb2Si2O7 phase under high speed steam jet at high temperatures[J]Corrosion Science,2008,50 (1):178-182.
[10]  LEE K N,MILLER R A,SON J.New generation of plasmasprayed mullite coatings on silicon-carbide[J]Journal of the American Ceramic Society,1995,78(3):705-710.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133