Fabrication and oxidation resistant behavior of plasma sprayed Si/Yb2Si2O7/LaMgAl11O19 coating for Cf/SiC composites at 1673 K
Fabrication and oxidation resistant behavior of plasma sprayed Si/Yb2Si2O7/LaMgAl11O19 coating for Cf/SiC composites at 1673 K
复制标题
1673 K Cf/SiC 复合材料等离子喷涂 Si/Yb2Si2O7/LaMgAl11O19 涂层的制备及其抗氧化性能
DOI：
10.1016/j.ceramint.2016.09.171
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发表时间：
2017
影响因子：
5.2
通讯作者：
Ling Zhu
中科院分区：
文献类型：
--
作者：
Wenjuan Fan;Binglin Zou;Cunyan Fan;Ying Wang;Xiaolong Cai;Shunyan Tao;Jiaying Xu;Chunjie Wang;Xueqiang Cao;Ling Zhu
在Cf/SiC复合材料表面等离子喷涂Yb2Si2O7/LaMgAl11O19涂层。研究了涂层在1673℃下的组织结构和抗氧化性能。结果表明，涂层的物相组成与粉末相同，且均匀分布在基材上。有硅粘结层的涂层与基材的结合界面优于无硅粘结层的涂层与基材的结合界面。在1673℃下加热15次，90min后，有硅层和无硅层的涂层样品的失重率分别为2.54%和21.89%，而未涂层的样品的失重率高达36.47%。在一定程度上，Si粘结层有效地修复了基材表面的孔洞，缓解了涂层与基材之间的热膨胀系数失配，从而显著提高了涂层的抗氧化性能。涂层与基材之间的热膨胀系数不同，LaMgAl11O19层与Yb2Si2O7层之间的化学反应以及Cf/SiC复合材料内部的孔洞和裂纹都不利于涂层的抗氧化性能。
Cf/SiC composites were plasma sprayed with Yb2Si2O7/LaMgAl11O19coatings with and without Si bond layer. Microstructure and oxidation protection of the coatings at 1673 K were investigated. The results showed that the coatings have the same phase constituent as that of the powders and uniformly distributed on the substrate. The bonding interface between the coating and substrate with Si bond layer is better than that of without Si bond layer. After 15 cycles of heating at 1673 K for 90 min, the weight losses of the coated samples with and without Si bond layer were 2.54% and 21.89%, respectively, however, for the uncoated sample, its weight loss was up to 36.47%. To certain extent, the Si bond layer efficiently healed the porosity on the surface of substrate and relieved the mismatch of coefficient of thermal expansion (CTE) between the coating and substrate, and therefore significantly improved the oxidation protection of the coating. The difference of CTEs between the coating and substrate, the chemical reactions between the LaMgAl11O19and Yb2Si2O7layers and the holes and cracks inside Cf/SiC composites were disadvantageous to the oxidation resistance of the coatings.
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DOI：
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影响因子：
6.4
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