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Nb-Si基高温合金是一种具有高熔点、较低的密度以及良好的高温蠕变强度的高温结构材料,定向凝固技术可以有效改善该合金的综合力学性能。针对Nb-Si基高温合金的定向凝固技术主要有晶体提拉法、区域熔化法、整体定向凝固法等,本文综述了近年来国内外Nb-Si基高温合金的定向凝固制备技术的研究进展,并对定向凝固技术的未来发展进行了展望。
Nb-Si-based superalloy is a high-temperature structural material with high melting point, low density and good high-temperature creep strength. Directional solidification technology can effectively improve the mechanical properties of the alloy. Directional solidification techniques for Nb-Si-based superalloy mainly include crystal pulling method, zone melting method and integral directional solidification method. In this paper, the research progress of directional solidification technology for Nb-Si based superalloys at home and abroad is reviewed. The future development of directional solidification technology is also prospected.