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研究了在传统氢还原工艺制备纳米碳化钨粉末过程中不同氧化钨的形貌结构对纳米W/WC粉末均匀性的影响,并对粉末及其WC-Co烧结体的性能进行了表征。结果表明,用具有疏松、多孔形貌结构的细小氧化钨颗粒更容易制备出结构较疏松、分散性较好的纳米W粉和WC粉。晶粒聚集和异常粗大颗粒的产生,主要与碳化过程中团聚纳米钨粉颗粒因烧结合并增粗有关。
The effects of morphologies of different tungsten oxides on the uniformity of nano-W / WC powders during the preparation of nano-tungsten carbide powders by conventional hydrogen reduction process were studied. The properties of powders and WC-Co sintered powders were characterized. The results show that nano-W powder and WC powder with loose structure and good dispersibility can be easily prepared by using fine tungsten oxide particles with loose and porous morphology. The aggregation of grains and the generation of abnormally coarse grains are mainly due to the sintering and coarsening of agglomerated nano-tungsten particles during the carbonization.