【摘要】 介绍了一种以高团聚态纳米W为原料,采用胶状碳包覆前驱体工艺,低成本、高效率制备高稳定性、低氧、均质、粒状超细和纳米WC粉末的新方法,并对碳化工艺条件进行了探讨。结果表明,氢气氛可以加速C-W反应过程;WC粉对原料W粉的粒度分布特征具有继承性;采用比表面积平均粒度为46.1nm的W粉为原料,当碳化温度由1 000°C增加至1 300°C时,WC的BET比表面积平均粒度由68.6 nm增加至339.4nm,氧含量由0.44%降低至0.10%。更多还原

【Abstract】 A new process for synthesizing homogeneous,granular ultrafine and nano scaled tungsten carbide with good stability in open air from well dispersed colloidal carbon coated nano tungsten precursor with highly agglomerated nano scaled tungsten powder as starting material in a cost effective way is introduced.It is shown that hydrogen atmosphere facilitates carbon and tungsten reaction process.Using tungsten powder with BET calculated grain size of 46.1 nm as starting material,when the carburization temperature increases from 1 000 °C to 1 300 °C,the BET calculated grain size of tungsten carbide powder increases from 68.6 nm to 339.4 nm and the oxygen content decreases from 0.44% to 0.10%.Inheritance character in grain size distribution of tungsten carbide from tungsten starting material has been observed.更多还原