WSi₂ and mullite co-modified MoSi₂ (WMM) coatings were prepared by atmospheric plasma spraying (APS) on the siliconized Nb alloy, and the oxidation behavior was investigated at 1500 °C in air. Single MoSi₂ (M) and single mullite modified MoSi₂ (MM) coatings were also studied for comparison. The effective protection time (≥500 h) of WMM coating was at least 2.8 and 1.5 times longer than that of M (175 h) and MM (346 h) coatings, respectively. The mass loss of the WMM sample was only 4.41 mg/cm² after oxidation up to 500 h, which was 77% and 75% lower than that of M (18.88 mg/cm²) and MM (17.59 mg/cm²) samples, respectively. Such an attractive long-term oxidation protection performance of WMM coating was attributed to the incorporation of mullite and WSi₂. The presence of mullite and, in particular, of glassy SiO₂ contributed to seal cracks. On the other hand, WSi₂ gave rise to the growth of a new transition layer of (Nb, Mo, W)₅Si₃ in the coating, which restrained the outward diffusion of Nb atoms, thus kept the oxide layer intact and stable.

通过大气等离子喷涂（APS）在硅化的Nb合金上制备WSi ₂和莫来石共改性MoSi ₂（WMM）涂层，并在1500°C的空气中研究其氧化行为。还研究了单MoSi ₂（M）和单莫来石改性MoSi ₂（MM）涂层以进行比较。WMM涂层的有效保护时间（≥500 h）分别比M（175 h）和MM（346 h）涂层的有效保护时间长至少2.8和1.5倍。氧化至500小时后，WMM样品的质量损失仅为4.41 mg / cm ²，比M（18.88 mg / cm ²）和MM（17.59 mg / cm ²）分别降低77％和75％。）的样本。WMM涂层如此诱人的长期抗氧化性能归因于莫来石和WSi _2的结合。莫来石，尤其是玻璃状SiO _2的存在导致了密封裂纹。另一方面，WSi ₂导致涂层中新的（Nb，Mo，W）₅ Si ₃过渡层的生长，从而抑制了Nb原子的向外扩散，从而保持了氧化层的完整性和稳定性。