Corrosion behavior and failure mechanism of SiC whisker and c-AIPO4 particle-modified novel tri-layer Yb2Si2O7/mullite/SiC coating in burner rig tests

被引：46
作者：
Chen, Pengju [1 ]
Xiao, Peng [2 ]
Tang, Xian [1 ]
Li, Yang [2 ,3 ]
机构：
[1] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China
[2] Cent South Univ, Powder Met Res Inst, Changsha 410083, Peoples R China
[3] Cent South Univ, Nat Key Lab Sci & Technol High Strength Struct Ma, Changsha 410083, Peoples R China
来源：
JOURNAL OF ADVANCED CERAMICS | 2022年 / 11卷 / 12期
基金：
国家重点研发计划; 中国博士后科学基金; 中国国家自然科学基金;
关键词：
Yb2Si2O7; mullite; tri-layer; sol-gel; burner rig test; ENVIRONMENTAL BARRIER COATINGS; RARE-EARTH DISILICATES; HIGH-TEMPERATURE; OXIDATION BEHAVIOR; C/SIC COMPOSITES; MICROSTRUCTURE; EVOLUTION; MULLITE; YB;
D O I：
10.1007/s40145-022-0655-6
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
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-AlPO4 bonding phase are firstly used to improve the service life of novel tri-layer Yb2Si2O7/mullite/SiC EBCs in the burner rig test. The formation of penetrating cracks in Yb2Si2O7/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 Yb2Si2O7 /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 x10(-3) g.cm(-2). Although c-A1PO 4 particles further improved the service life of SiCw-mullite (SM) coating, the overflow of POx gas aggravated the formation and expansion of cracks in the Yb2Si2O7 outer coating, and caused the service life of overall Yb2Si2O7/c-AlPO4-SiCw-mullite (ASM)/SiC coating to be slightly lower than that of Yb2Si2O7/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.
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页码：1901 / 1917
页数：17
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