氢气脱蜡工艺与原料WC碳量的选择

将不同碳含量碳化钨配制的钴含量为11%左右的硬质合金石蜡混合料压制成压坯,将压坯置于一体化ZKL-16氢气脱蜡真空烧结炉和真空脱蜡真空烧结炉中,采用氢气、氮气、真空三种脱蜡方式分别进行脱蜡后真空烧结,烧结后的合金进行检测分析,比较发现采用氢气脱蜡真空烧结工艺可采用饱和碳化钨。在氢气脱蜡工艺下,研究了各工艺参数对脱蜡效果的影响,以确定氢气脱蜡条件下矿用硬质合金原料WC碳量的选择。结果表明,采用饱和碳含量6.13%的WC作为原料,经氢气脱蜡真空烧结,可生产出合格的硬质合金。

Choice of Carbon Content of Tungsten Carbide for Hydrogen Dewaxing Technology

Different grades of cemented carbide mixture comprising about 11% of cobalt,various contents of tungsten carbide and paraffin were pressed into green blanks.The blanks were put into ZKL-16 hydrogen or vacuum dewaxing and vacuum sintering furnace,dewaxed by three different way of hydrogen,nitrogen or vacuum dewaxing,and then sintered.After sintering,the sintered blanks were determined and the results were analyzed.It is found that the saturated tungsten carbide is fit for the hydrogen dewaxing and vacuum sintering technology.The influences of various process parameters of hydrogen dewaxing on the dewaxing effect were studied,to determine the carbon content of tungsten carbide material used for cemented carbide for mining.The results shows that,via using tungsten carbide powder with 6.13% of saturated carbon content as raw material,qualified cemented carbide can be prepared by hydrogen dewaxing and vacuum sintering.