Mo–Si–B alloys were obtained by spark plasma sintering (SPS) using fine Mo–Si–B alloy powders with a particle size of 2.5 μm. The SPS Mo–Si–B alloys consisted of fine MoSi2/Mo2Bi5(Mo5Si3)/MoB/SiO2 phases. Under isothermal conditions, the weight-gain kinetics of the Mo–Si–B alloys obtained by SPS exhibited parabolic time dependence and these Mo–Si–B alloys showed better oxidation resistance at moderate temperatures of 500 °C and 600 °C with no “pest” failure. The oxide scale on the sample surface consisted of MoO3, amorphous borosilicate and crystalloid SiO2 phases. An increase in the oxidation temperature from 500 to 600 °C caused a significantly higher fluidity and a shorter incubation stage for the formation of a continuously protective borosilicate layer, so that the mass gain was smaller than 1 mg/cm2 for oxidation at 600 °C for 100 h, which corresponds to the excellent oxidation resistance.

中文翻译：

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通过添加 B 来改善 MoSi2 金属间化合物在 500 °C 和 600 °C 下的“Pest”抗性

Mo-Si-B 合金是通过放电等离子烧结 (SPS) 获得的，使用粒度为 2.5 μm 的细 Mo-Si-B 合金粉末。SPS Mo-Si-B 合金由细小的 MoSi2/Mo2Bi5(Mo5Si3)/MoB/SiO2 相组成。在等温条件下，通过 SPS 获得的 Mo-Si-B 合金的增重动力学表现出抛物线时间依赖性，这些 Mo-Si-B 合金在 500 °C 和 600 °C 的中等温度下表现出更好的抗氧化性，没有“害虫”失败。样品表面的氧化皮由 MoO3、无定形硼硅酸盐和晶体 SiO2 相组成。氧化温度从 500°C 增加到 600°C 导致流动性显着提高和形成连续保护性硼硅酸盐层的孵化阶段更短，因此在 600°C 下氧化的质量增益小于 1 mg/cm2 100 小时，