论文部分内容阅读
许多研究者采用金属氢化物与石墨反应、区域熔炼或粉末烧结等方法制备MCx相样品,用X光衍射、核磁共振或透射电镜等技术进行研究时发现,在VC_(0.77)-VC_(0.88)之间有一三角系或单斜系的有序V_6C_5相;在VC_(0.87)-VC(0.90)之间有一立方系的有序V_8C_7相;在NbC_(0.67)-NbC_(0.97)之间有一与有序V_6C_5类似的Nb_6C_5相。此外,长时间时效后,在Fe-1V-0.02Nb-0.2C合金中沉淀的碳化钒中发现有序V_6C_5相;在Ni-4V-0.4C合金中发现有序V_6C_5相;在中碳合金钢中发现有序V_6C_5和有序(V,Ti)_6C_5相;在热强钢中发现有序V_8C_7相。
Many researchers use the method of metal hydride and graphite reaction, region smelting or powder sintering to prepare MCx phase samples. The results of X-ray diffraction, 1H NMR and TEM show that in the range of VC_ (0.77) -VC_ (0.88) There is a triangular or monoclinic series of ordered V_6C_5 phases; there is a cubic system ordered V_8C_7 phase between VC_ (0.87) -VC (0.90); and between NbC_ (0.67) -NbC_ (0.97) Ordered V_6C_5 similar Nb_6C_5 phase. In addition, an ordered V_6C_5 phase was found in the vanadium carbide precipitated in the Fe-1V-0.02Nb-0.2C alloy after prolonged aging; an ordered V_6C_5 phase was found in the Ni-4V-0.4C alloy; The ordered V_6C_5 and ordered (V, Ti) _6C_5 phases were found. The ordered V_8C_7 phase was found in the hot steel.