The present study investigated the sintering behaviour of Nb–16Si–25Ti–8Hf–2Cr–2Al alloy powders. The alloy powders were produced using ahydrogenation–dehydrogenation method and featured an irregular morphology. Powders sintered at 1500°C and 1600°C exhibited pores in their microstructures, while powders sintered at 1700°C for 4 h were fully densified and poreless. The cast ingot and powders were composed of three phases: Nb_ss, Nb₅Si₃, and Nb₃Si. However, the Nb₃Si phase was not observed, while HfO₂ oxides formed in the sintered compact. The hafnium and oxygen reacted to form an HfO₂ oxide during the high-temperature sintering process. From the result of the thermodynamic calculation, Hf oxide formed after sintering because Hf has the highest driving force for oxidation among the elements constituting the alloy.

本研究调查了Nb–16Si–25Ti–8Hf–2Cr–2Al合金粉末的烧结行为。合金粉末是使用氢化-脱氢方法生产的，具有不规则的形态。在1500°C和1600°C烧结的粉末在其微观结构中显示出孔，而在1700°C烧结4小时的粉末则完全致密且无孔。铸锭和粉末由三相组成：Nb _ss，Nb ₅ Si ₃和Nb ₃ Si。然而，未观察到Nb ₃ Si相，而在烧结体中形成了HfO ₂氧化物。与氧反应生成HfO ₂在高温烧结过程中会产生氧化物。根据热力学计算的结果，在构成合金的元素中，由于Hf具有最高的氧化驱动力，因此烧结后形成的Hf氧化物。