Nb-Si金属间化合物基超高温合金具有熔点高、密度低、高温强度和加工性能良好的优点,被认为是最有希望取代第3代Ni基单晶高温合金的候选材料.介绍了Nb-Si金属间化合物基超高温合金的典型组织特征、合金成分优化、组织控制以及组成相的作用等方面的研究进展.目前,室温韧性、高温强度和高温抗氧化性能等单项指标基本达到应用要求,但综合性能指标距航空发动机热端部件的应用要求还有较大差距.未来,在合金优化设计的基础上,如何寻求更合适的组织控制途径,实现室温韧性、高温强度和高温抗氧化性能硅化物的综合匹配,是Nb-Si金属间化合物基超高温合金发展的重要研究方向.
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