Corrosion behavior and failure mechanism of SiC whisker and c-AlPO_(4) particle-modified novel tri-layer Yb_(2)Si_(2)O_(7)/mullite/SiC coating in burner rig tests  

作　　者：Pengju CHEN Peng XIAO Xian TANG Yang LI 

机构地区：[1]School of Nuclear Science and Technology,University of South China,Hengyang 421001,China [2]Powder Metallurgy Research Institute,Central South University,Changsha 410083,China [3]National Key Laboratory of Science and Technology on High-strength Structural Materials,Central South University,Changsha 410083,China

出　　处：《Journal of Advanced Ceramics》2022年第12期1901-1917,共17页先进陶瓷（英文）

基　　金：funded by the National Key R&D Program of China(Grant Nos.2021YFB3703800 and 2021YFB3703802);National Natural Science Foundation of China(Grant No.52102122);National Key Laboratory of Science and Technology on High-strength Structural Materials,Central South University(Grant No.SYSJJ2021LWS01);China Postdoctoral Science Foundation(Grant No.2022M711540).

摘　　要：The corrosion behavior of environmental barrier coatings(EBCs)directly affects the service life and stability of ceramic matrix composite(CMC)structural parts in the aero-engines.The silicon carbide(SiC)whisker toughening phase and c-AlPO_(4) bonding phase are firstly used to improve the service life of novel tri-layer Yb_(2)Si_(2)O_(7)/mullite/SiC EBCs in the burner rig test.The formation of penetrating cracks in Yb_(2)Si_(2)O_(7)/mullite/SiC coating caused the failure of coating at 1673 K.The SiC whiskers in mullite middle coating significantly inhibited the formation of penetrating cracks in Yb_(2)Si_(2)O_(7)/mullite/SiC coating,and efficiently prevented the oxidation of carbon fiber reinforced silicon carbide(C_(f)/SiC)samples for 360-min thermal cycles(24 times)with a weight loss of 6.19×10^(−3) g·cm^(−2).Although c-AlPO_(4) particles further improved the service life of SiC_(w)-mullite(SM)coating,the overflow of PO_(x) gas aggravated the formation and expansion of cracks in the Yb_(2)Si_(2)O_(7) outer coating,and caused the service life of overall Yb_(2)Si_(2)O_(7)/c-AlPO_(4)-SiC_(w)-mullite(ASM)/SiC coating to be slightly lower than that of Yb_(2)Si_(2)O_(7)/SM/SiC coating.This study guides the design of modified tri-layer EBCs with long service life in high-temperature and high-speed gas environment.

关 键 词：Yb_(2)Si_(2)O_(7) MULLITE tri-layer sol-gel burner rig test 

分 类 号：TB332[一般工业技术—材料科学与工程]