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Influence of MoSi 2 on oxidation protective ability of TaB 2 -SiC coating in oxygen-containing environments within a broad temperature range
Journal of Advanced Ceramics ( IF 18.6 ) Pub Date : 2020-08-13 , DOI: 10.1007/s40145-020-0406-5
Xuanru Ren , Junshuai Lv , Wei Li , Yuwen Hu , Ke Sun , Can Ma , Hong’ao Chu , Weiguang Wang , Leihua Xu , Ziyu Li , Peizhong Feng

TaB2-SiC coating modified by different content of MoSi2 was fabricated on graphite substrate with SiC inner coating by liquid phase sintering to elevate the anti-oxidation capability of the TaB2-SiC coatings. As compared to the sample with the TaB2—40wt%SiC coating, the coating sample modified with MoSi2 exhibited a weight gain trend at lower temperatures, the fastest weight loss rate went down by 76%, and the relative oxygen permeability value reduced from about 1% to near 0. More importantly, the large amount of SiO2 glass phase produced over the coating during oxidation was in contact with the modification of MoSi2, which was proved to be beneficial to the dispersion of Ta-oxides. A concomitantly formed continuous Ta-Si-O-B compound glass layer showed excellent capacity to prevent oxygen penetration. However, when the TaB2 content was sacrificed to increase the MoSi2 content, the relative oxygen permeability of the coating increased instead of decreased. Thus, on the basis of ample TaB2 content, increasing the MoSi2 content of the coating is conducive to reducing the relative oxygen permeability of the coatings in a broad temperature region.



中文翻译:

MoSi 2对TaB 2 -SiC涂层在宽温度范围内含氧环境中的氧化防护能力的影响

通过液相烧结法在具有SiC内涂层的石墨基板上制备了不同含量的MoSi 2改性的TaB 2 -SiC涂层,以提高TaB 2 -SiC涂层的抗氧化能力。与具有TaB 2 -40wt%SiC涂层的样品相比,用MoSi 2改性的涂层样品在较低温度下表现出重量增加趋势,最快的失重率下降了76%,相对氧渗透率值从大约1%到接近0。更重要的是,氧化过程中在涂层上产生的大量SiO 2玻璃相与MoSi 2的改性接触事实证明,这有利于Ta氧化物的分散。伴随形成的连续的Ta-Si-OB化合物玻璃层显示出优异的防止氧气渗透的能力。然而,当牺牲TaB 2含量以增加MoSi 2含量时,涂层的相对透氧性增加而不是降低。因此,基于充足的TaB 2含量,增加涂层的MoSi 2含量有利于在较宽的温度范围内降低涂层的相对透氧性。

更新日期:2020-08-14
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