Evolution of microstructural feature and oxidation behavior of LaB6-modified MoSi2-SiC coating
Evolution of microstructural feature and oxidation behavior of LaB6-modified MoSi2-SiC coating
复制标题
DOI：
10.1016/j.jallcom.2018.04.267
复制
发表时间：
2018-07
影响因子：
6.2
通讯作者：
Changcong Wang;Kezhi Li;Caixia Huo;Qinchuan He;Xiaohong Shi
中科院分区：
文献类型：
--
作者：
Changcong Wang;Kezhi Li;Caixia Huo;Qinchuan He;Xiaohong Shi
采用超音速等离子喷涂（SAPS）方法，在SiC涂层C/C复合材料表面制备了LaB 6改性MoSi 2-SiC（MSL）抗氧化涂层。MSL涂层保护C/C复合材料在1773 K下静态氧化100 h，质量损失为6.52 mg cm− 2，在2023 K下动态烧蚀6个循环，质量损失为29.86 mg cm−2，这上级优于没有La掺杂的MoSi 2-SiC（MS）涂层。稀土La元素的存在促进了MoSi 2的液相烧结，B元素促进了富SiO2玻璃膜的高温稳定性，形成了低挥发性、透氧性好的La-Si-O-B化合物膜覆盖涂层表面，有助于提高MSL涂层的抗氧化性能。
LaB6-modified MoSi2-SiC (MSL) oxidation resistant coating was designed and successfully fabricated on SiC-coated carbon/carbon (C/C) composites using efficient supersonic atmospheric plasma spraying (SAPS) method. The MSL coating protected the C/C composites from static oxidation at 1773 K for 100 h with a mass loss of 6.52 mg cm−2and dynamic ablation about 2023 K for six cycles with a mass loss of 29.86 mg cm−2, which was superior to the MoSi2-SiC (MS) coating without La-doping. The presence of rare earth La element promoted the liquid phase sintering of MoSi2and B element facilitated the high-temperature stability of SiO2-rich glass scale, resulting in the formation of La-Si-O-B compound scale with a low volatility and oxygen permeability cover the coating surface, which contributed to improving the resistant to oxidative response of the MSL coating.