【摘要】 将高碳含量的纳米WC粉末在氢气流中进行热处理脱除游离碳,研究处理温度、保温时间和H2流量等工艺参数对WC粉碳含量及粒度的影响。结果表明,在温度为940℃,H2流量为3.5L/min,保温时间为100min的工艺条件下,可以将碳含量由9.74%降低至6.20%,处理后纳米WC颗粒无明显长大。当处理温度高于970℃会导致WC化合碳损失而生成W2C相,并造成WC颗粒长大。更多还原

【Abstract】 Nanosized WC powders with high carbon content were treated in flowing H₂ atmosphere to remove the uncombined carbon.The effect of processing temperature,holding time,and flux of H₂ on carbon content and particle size of decarburized powders were investigated.The results indicate that the carbon content decreases from 9.74% to 6.20% after treating at 940℃ for 100 min in H₂ with the flux of 3.5 L/min.Notable particle growth does not happen at the temperature.Treating at temperature higher than 970℃ causes loss of combined carbon and formation of W₂C phase.Moreover,high temperature also cause particle growth of WC.更多还原