摘要
传统的纳米WC-Co复合粉末制备通常是将超细WC粉和Co粉在高能球磨机中进行研磨破碎得到，粉末形状不规则，成分、粒度分布不均匀，容易掺杂，难于满足大批量工业化生产。以偏钨酸铵（AMT）、可溶性钴盐、有机碳源为原材料，采用喷雾干燥、煅烧、低温还原碳化工艺制备纳米晶 WC-Co 复合粉末。对粉末进行碳含量、氧含量、松装密度测定以及形貌观察和物相分析。结果表明：WC-Co复合粉末外观多呈空壳球形骨架结构， Co对WC晶粒形成纳米级包覆，各成分分布均匀，一次颗粒尺寸在100～200 nm之间。粉末具有流动性好、晶粒细小且均匀等特点，适用于制备超细硬质合金，在堆焊和喷涂领域有广阔的应用前景。
The traditional nanophase WC-Co composite powder is generally synthesized by superfine WC powder and Co powder through high energy ball milling. However, its irregular shape, uneven distribution of component and particle size make the powder being easily doped, which make it difficult to meet the need of mass industrial production. Using ammonium metatungstate （AMT）, soluble cobalt salt, and organic carbon source as raw materials, the nanocrytalline WC-Co composite powder was produced by spray-drying, calcination and low temperature reduction-carbonization process. The carbon content, oxygen content and bulk density of the powder were measured, the morphology and phase composition were also identified. The results show that, the appearance of the powder is shell spherical skeleton structure, the WC particles are coated by the Co at the nano level, the component is uniform, the primary particle size is in the range of 100~200 nm. The powder has the character of good fluidity, fine crystal grain and even distribution, which is suitable for preparating ultrafine cemented carbide and has wide application prospects in the field of welding and spraying.
出处
《粉末冶金材料科学与工程》
EI
北大核心
2013年第6期835-839,共5页
Materials Science and Engineering of Powder Metallurgy
基金
国家国际科技合作专项(2011DFR50970)
国家高技术研究发展计划(863计划)资助项目(2012AA061902)
国家自然科学基金资助项目(51174101)
湖南省科技重大专项(2012FJ1009)
江西省高等学校科技落地计划资助项目(KJLD12072)
关键词
纳米晶WC—Co复合粉
喷雾干燥
低温还原碳化
nanocrytalline WC-Co composite powder
spray-drying
low temperature reduction-carbonization
