粗颗粒碳化钨粉制取过程中的质量控制

ON THE QUALITY CONTROL IN THE PRODUCTION OF COARSE TUNGSTEN CARBIDE

对粗颗粒碳化钨粉制取过程中杂质含量和碳化质量的控制问题进行了探讨。指出 ,为了降低 W粉中的杂质含量 ,操作者在倒料之前一定要认真清除 W粉表面异物 ,不允许把 W粉筛上物强行擦碎过筛 ,并选用在 960℃的还原温度下性能较 Cr2 5Ni2 0更稳定的舟皿材质 ,以减少舟皿给 W粉带来的污染。此外 ,对生产场地的文明卫生也应引起足够的重视。为了提高粗颗粒碳化钨粉质量 ,宜采用加 Co、通 H2 碳化 ,且碳化温度不宜太高 ,不要超过 1 890℃。实验结果表明 ,如果氧化钨原料中存在含量偏高的、但在碳化温度下能大量挥发的某些杂质元素 ,通过工艺过程的严格控制 ,仍可生产出综合性能较好的合金。

The impurity content control and the quality control in the carbonization process in the production of coarse tungsten carbide have been studied.It is shown that,to reduce the impurity content,the abnormal substance above the surface of tungsten powder in the boat must be removed carefully,the oversize powder is not allowed to be stamped to sift through the wire and the attentions to the powder production environment and the material of the boat used in the reduction process must be paid.It is recommended that carbonizaion be carried out in hydrogen atmosphere with cobalt oxide additive.Carbonization temperature over 1890℃ will result in inferior quality of tungsten carbide.Tungsten oxide with impurities of comparatively higher content that can been heavily volatilized at the carbonization temperature can be used in the production of cemented carbide with good properties through the strict technological process control.