Abstract A new type MoSi 2 /(Mo, Ti)Si 2 dual-phase composite coating for oxidation protection was designed and prepared on molybdenum alloy by a method of fused slurry. High temperature oxidation resistance of the coating has been investigated by isothermal oxidation test. Microstructure evolution and phase transformation of the as-prepared and oxidized coating were characterized. The results show that the composite coating is composed of primary C11 b MoSi 2 and C40 (Mo, Ti)Si 2 phases. The substitution of molybdenum with titanium in MoSi 2 gave (Mo,Ti)Si 2 of the C40 structure, resulting the formation of a C11 b MoSi 2 /C40 (Mo, Ti)Si 2 dual-phase composite coating. The composite coating could provide long term oxidation resistant protection for Mo alloy at high temperature, attributing to the good protection of a Si-Ti-O compound glass formation during oxidation.

中文翻译：

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钼合金氧化保护用MoSi 2 /(Mo, Ti)Si 2 双相复合涂层

摘要 采用熔浆法在钼合金上设计并制备了一种新型的MoSi 2 /(Mo, Ti)Si 2 双相复合氧化保护涂层。通过等温氧化试验研究了涂层的高温抗氧化性。表征了所制备和氧化涂层的微观结构演变和相变。结果表明，复合涂层由初生C11 b MoSi 2 和C40 (Mo, Ti)Si 2 相组成。MoSi 2 中钼与钛的置换得到C40结构的(Mo,Ti)Si 2 ，导致形成C11 b MoSi 2 /C40 (Mo, Ti)Si 2 双相复合涂层。复合涂层可以在高温下为钼合金提供长期的抗氧化保护，