摘要
本文通过实验探索了水溶化学法制备纳米WC/C0复合粉工艺，研究了影响喷雾转换、锻烧、碳化和调碳的工艺因素，找到了满足纳米WC/Co复合粉制备的工艺参数。在Kear等人的经典合成技术中，碳化钨钴纳米复合材料是由喷雾转化水溶液的化学计量量的水溶性钨源和钴源，然后用流化床通氢将钨钴氧化物还原为金属钨和钴，之后在一个充满CO/CO2的气体环境中将金属钨和钴碳化成纳米WUCo复合粉末。本研究不同于Kear等人的处理方法，涉及的WC/C0使用水溶性溶液钨、钴和碳前躯体加工的纳米复合材料，大量的WGCo纳米复合粉体是将钨、钴和碳在分子级水平上混合制备成一个复杂的前驱体粉末的独特方案，前驱体粉末在煅烧炉充满惰性气体约100撕00cC的温度下转化成一个含有W-Co-C-0的预复合粉粉末，随后在碳化炉低于1000℃的温度下碳化。实验表明，水溶化学法生产的纳米WC/Co复合粉较常规方法，具有晶粒细而均匀、流动性好等特点，更适于高性能硬质合金的生产。
The process for nanometer WC/Co composite powder prepared by aqueous solution chemistry method was researched. The influencing factors of the spray conversion, calcination, carbonization and adjusting carbon content processes were investigated, through which the process parameters for the preparation of nanometer WC/Co composite powder were confirmed. In the Kear et aFs classic synthesis technique, tungsten carbide and cobalt nanocomposites were made by the spray conversion of aqueous solution containing stoichiometric amount of water soluble tungsten and cobalt precursors, foIlowed by fluidized bed processing, wherein .the W and Co oxides were firstly reduced to metallic W and Co in hydrogen subsequently carburized to form nanostructured WC/Co composite powder in C0/C02 gaseous environment. However it is distinct from Kear＇s processing method, this research involves the processing of WC/Co nanocomposite using water soluble solution of W-, Co- and C precursors. Large quantities of commercial scale WC-Co nanocomposite powder were made by an unique combination of converting molecularly mixed W-, Co-, and C-containing solutions into complex powder precursor, then the precursor powder was converted into W-Co-C-O containing powder intermediates in a beltfurnace at about 100-600 ℃ in an inert atmosphere, followed by carburization at temperature less than 1 000 ℃. The experiments show that compared with conventional method, the aqueous solution chemistry method for the production of nanometer WC/Co composite powder has the characteristics of fine and uniform grain with good liquidity, which is more suitable for the production of high performance cemented carbide.
出处
《硬质合金》
CAS
2013年第5期261-269,共9页
Cemented Carbides
基金
国家科技支撑计划项目(2011BAE09B00)
福建省618示范项目
关键词
水溶化学法
纳米WC
Co复合粉
工艺探索
aqueous solution chemistry method
nanometer WC/Co composite powder
technique research
