Nb-Si基合金高温抗氧化研究进展

Nb-Si基合金具有适中的密度和超高的使用温度，是下一代发动机叶片及高温热端部件的有力竞争者之一，但Nb-Si基合金的高温抗氧化性能不足限制了其应用。主要综述了合金化和硅化物涂层在Nb-Si基合金中的研究进展。在此基础上着重综述了掺杂不同合金元素对Nb-Si基合金中硅化物、抗氧化相和氧化膜的影响，包括提升硅化物相高温氧化能力、促进Al2O3和Cr2Nb形成以阻碍氧原子扩散、通过稀土元素形成黏附性特别高的氧化物以防止氧化层脱落等方面。除此之外，综述了硅化物涂层(MoSi2和NbSi2)的研究进展，包括可通过降低硼硅酸盐的黏度和致密的SiO2薄膜提高Nb-Si基合金的抗氧化性能，并介绍了元素改性硅化物涂层提升SiO2流动性的效果。最后，对该方向的研究进展进行了总结，并对其发展前景和主要发展方向进行了展望。

Research Progress on High-temperature Oxidation Resistance of Nb-Si-based Alloys

Due to moderate density and ultra-high service temperature, Nb-Si-based alloy is one of the favorable competitors for the next generation of engine blades and high-temperature hot end components, but the insufficient high-temperature oxidation resistance of Nb-Si-based alloy limits its application. In this work, the research progress of alloying and silicide coatings in Nb-Si-based alloys was mainly reviewed. On this basis, the effects of doped different alloying elements on silicide, antioxidant phases and oxide films in Nb-Si-based alloys were reviewed in terms of improving the high-temperature oxidation capacity of silicide phase, promoting the formation of Al2O3 and Cr2Nb to hinder the diffusion of oxygen atoms, and forming oxides with particularly high adhesion with rare earth elements to prevent the shedding of oxide layers. In addition, the oxidation resistance of Nb-Si-based alloys by reducing the viscosity of borosilicate and dense SiO2 film was reviewed, and the effect of elemental modified silicide coatings on improving the fluidity of SiO2 was introduced. Finally, the research progress in this direction was summarized, and its development prospects and main development directions were prospected.