Microstructure and oxidation behavior of a novel bilayer (c-AlPO4-SiCw-mullite)/SiC coating for carbon fiber reinforced CMCs
Microstructure and oxidation behavior of a novel bilayer (c-AlPO4-SiCw-mullite)/SiC coating for carbon fiber reinforced CMCs
复制标题
用于碳纤维增强 CMC 的新型双层 (c-AlPO4-SiCw-莫来石)/SiC 涂层的微观结构和氧化行为
DOI：
10.1016/j.jeurceramsoc.2019.06.026
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发表时间：
2019-11-01
影响因子：
5.7
通讯作者：
Li, Yang
中科院分区：
文献类型：
--
作者：
Chen, Pengju;Xiao, Peng;Li, Yang
采用溶胶-凝胶结合空气喷涂的方法，在SiC涂层碳纤维增强SiC复合材料（C/SiC）上制备了一种新型的石钡石磷酸铝颗粒（C - aipo(4)）改性SiC晶须增韧莫来石涂层（C - alpo4 - sicw -莫来石），提高了sicw -莫来石涂层的抗氧化性。结果表明：c-AlPO4- sicw -莫来石涂层中c-AlPO4含量分别为10 wt.%和20 wt.%时，在1773 K环境空气中保温100 h的抗氧化性能明显优于SiC莫来石涂层；当c- alpo4 - sicw -莫来石涂层中c-AIP04含量为30%和40% wt.%时，cAlPO(4)- sicw -莫来石涂层的抗氧化性能迅速下降。当c-AlPO4含量为20wt .%时，c-AlPO4- sicw -莫来石涂层表现出最显著的抗氧化性，在环境空气中氧化210 h后的失重速率仅为3.00 × 10(-5) g.cm(-2) h（-1）。c-AlPO4- sicw -莫来石涂层在1773 K下长时间氧化后，涂层中产生渗透性微裂纹和微孔，导致涂层失效。
A novel cristobalite aluminum phosphate particle (c-AIPO(4)) modified SiC whisker toughened mullite coating (c-AlPO4-SiCw-mullite) was prepared on SiC coated carbon fiber reinforced SiC composites (C/SiC) by a new sol-gel method combined with air spraying to improve the oxidation resistance of SiCw-mullitecoating. Results show that c-AlPO4-SiCw-mullite coatings with 10 and 20 wt.% of c-AlPO4 exhibited obviously improved oxidation resistance at 1773 K in ambient air for 100 h than SiC mullitecoating. Moreover, the oxidation resistance of cAlPO(4)-SiCw-mullite coatings were rapidly declined when the c-AIP04 in c-AlPO4-SiCw-mullite coating were set to 30 and 40 wt.%. The c-AlPO4-SiCw-mullite coating with 20 wt.% of c-AlPO4 showed most pronounced oxidation resistance, the weight loss rate after the oxidation in ambient air for 210 h was merely 3.00 x 10(-5) g.cm(-2) h(-1). The failure of c-AlPO4-SiCw-mullite coating with 20 wt.% of c-AlPO4 was due to the generation of penetrative micro-cracks and micro-holes in the coating, which cannot be self-healed by the silicate glass layer after long time oxidation at 1773 K.