Microstructure and oxidation resistant behavior of Er2Si2O7 and Er2Si2O7/LaMgAl11O19 coatings deposited on C-f/SiC composites by APS at 1723 K
Microstructure and oxidation resistant behavior of Er2Si2O7 and Er2Si2O7/LaMgAl11O19 coatings deposited on C-f/SiC composites by APS at 1723 K
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1723 K 下 APS 在 C-f/SiC 复合材料上沉积的 Er2Si2O7 和 Er2Si2O7/LaMgAl11O19 涂层的微观结构和抗氧化行为
DOI：
10.1016/j.jallcom.2017.03.108
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发表时间：
2017
影响因子：
6.2
通讯作者：
Cao Xueqiang
中科院分区：
文献类型：
--
作者：
Zhang Mengxian;Fan Wenjuan;Zou Binglin;Wang Ying;Cai Xiaolong;Wang Chunjie;Zhou Xin;Cao Xueqiang
为了提高Cf/SiC复合材料的抗氧化性能，采用大气等离子喷涂（APS）技术在Cf/SiC复合材料表面制备了Er 2Si 2 O 7和Er 2Si 2 O 7/LaMgAl 11 O 19涂层。在1723 K热震炉中研究了涂层的显微组织和抗氧化性能。结果表明，喷涂层在基体上分布均匀，与基体结合良好。在120 min的热震循环中，经过8次热震循环后，裸衬底的最大失重率为43.8%，而涂覆Er 2Si 2 O 7和Er 2Si 2 O 7/LaMgAl 11 O 19涂层的样品的失重率分别为3.73%和1.88%。由于涂层与基体热膨胀系数的差异、Er 2Si 2 O 7层的烧结、基体的表面氧化以及陶瓷层之间的界面反应，涂层中出现了贯穿裂纹和水平裂纹，随着热震循环次数的增加，涂层试样的失重显著增加。Er 2Si 2 O 7和Er 2Si 2 O 7/LaMgAl 11 O 19涂层对Cf/SiC复合材料在1723 K下的抗氧化性能对于短期应用（如总加热时间为几十分钟的多次热冲击循环）具有很大的吸引力。
Er2Si2O7and Er2Si2O7/LaMgAl11O19coatings were fabricated on Cf/SiC composites by atmospheric plasma spraying (APS) in order to improve the oxidation resistance of the substrate. Microstructure and oxidation resistant behavior of the coatings were investigated at 1723 K in the thermal shock furnace. The results showed that the as-sprayed coatings were uniformly distributed on the substrate and bonded well with the substrate. The bared substrate has the maximum weight loss of 43.8% after 8 thermal shock cycles with the total heating time of 120 min, while for the samples coated with the Er2Si2O7and Er2Si2O7/LaMgAl11O19coatings, the weight losses were only up to 3.73% and 1.88%, respectively. Due to the difference of coefficients of thermal expansion between coatings and substrate, the sintering of Er2Si2O7layer, the surface oxidation of substrate and the interfacial reactions between the ceramic layers, the through cracks and horizontal cracks appeared in the coatings with the thermal shock cycle increasing, which significantly led to the increasing weight loss for the coated samples. The oxidation protection of Er2Si2O7and Er2Si2O7/LaMgAl11O19coatings for Cf/SiC composites at 1723 K is much attractive for the short-term application such as several thermal shock cycles with the total heating time of tens of minutes.