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本文通过实验探索了水溶化学法制备纳米WC/Co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WC/Co复合粉末。本研究不同于Kear等人的处理方法,涉及的WC/Co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WC/Co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100~600℃的温度下转化成一个含有W-Co-C-O的预复合粉粉末,随后在碳化炉低于1 000℃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。
In this paper, the process of water-soluble chemical preparation of nano-WC / Co composite powder was explored experimentally, and the technological factors affecting spray conversion, calcination, carbonization and carbon adjustment were investigated. In Kear et al.’s classical synthesis technique, a tungsten carbide cobalt nanocomposite is a stoichiometric amount of a water-soluble tungsten source and cobalt source that is spray-converted to an aqueous solution, and then the tungsten cobalt oxide is reduced to metal tungsten And cobalt, followed by carbonization of the metal tungsten and cobalt into the nano-WC / Co composite powder in a CO / CO2-laden gas environment. This study is different from the treatment of Kear et al., Which involved WC / Co nanocomposites processed with water-soluble solutions of tungsten, cobalt and carbon precursors. A large number of WC / Co nanocomposite powders were prepared by mixing tungsten, cobalt and carbon in At the molecular level, a unique solution is prepared by mixing to form a complex precursor powder. The precursor powder is converted into a pre-composite powder containing W-Co-CO at a temperature of about 100 to 600 ° C in an inert atmosphere of the calciner, Carbonization at a temperature below 1000 ° C in the carbonization furnace. Experiments show that the water-soluble chemical production of nano-WC / Co composite powder than the conventional method, with fine grain and uniform, good liquidity and other characteristics, more suitable for the production of high-performance cemented carbide.