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.

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。