研究与评论:材料科学杂雷竞技苹果下载志
菜单ISSN: 2321 - 6212
ISSN: 2321 - 6212
Sanjib Majumdar
印度巴巴原子研究中心
海报和接受的摘要:垫子科学
DOI:10.4172 / 2321 - 6212 - c7 - 033
钼和铌基金属材料或复合材料正被研究作为超越镍基高温合金能力限制的高温应用的潜在替代品。具有MossÃⅰÂ′Â′Mo5SiB2 (T2)-Mo3Si (A15)三相组织的Mo-Si-B合金被认为是最具应用前景的材料。详细研究了稀土元素Y和La对Mo-Si-B合金氧化行为的影响。这些元素在氧化早期促进稳定的钇/钼酸镧相的形成。MoO3的形成和挥发被抑制，并且形成了富含二氧化硅的外层垢，提供了优越的抗氧化保护。采用机械合金化和反应热压法制备了Mo-40Ti-30Si (wt %)和Mo-40Ti-10Si组成的Mo-Ti-Si合金，温度为1600 à °C。合金的密度被发现远低于用于高温应用的传统合金。在静态空气中，在900-1300 Ã‑°C的温度范围内对这两种合金进行了氧化试验。Mo-40Ti-30Si合金具有较好的抗氧化性，氧化层厚度随温度和暴露时间的变化在2-90 à ¼m之间。这些合金的机械性能比较，相对于微观或纳米硬度的测量个别相。 Mo-TZM (Mo-0.5Ti-0.1Zr-0.02C) and Nb-1Zr-0.1C alloys were produced respectively by powder metallurgy and reduction followed by electron beam melting. Development of microstructure and evaluation of mechanical properties are studied in detail with varying heat treatment procedure. Silicide and alumino-silicide based coatings were developed on Mo-Si-B, Mo-Ti-Si, TZM and Nb-1Zr-0.1C alloys. The coated alloys showed superior oxidation resistance as compared to the bare materials. The detailed microstructural characterization using scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), electron backscattered diffraction (EBSD) and transmission electron microscopic (TEM) analysis revealed the formation of different phases in the alloy systems, coating layers and protective oxide scales.
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