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采用不同温度进行原位还原碳化反应制备纳米粒径的WC-Co复合粉末,进而利用放电等离子烧结技术进行快速致密化,制备得到致密的纳米晶硬质合金块体材料。系统的检测分析表明,低温下反应制备的以缺碳相为主相的复合粉经烧结致密化后块体试样存在WC晶粒高度取向分布的特征,其中,(0001)面在垂直于压力方向上面积分数达到40%,在平行于压力方向上(0001)面的面积分数仅为10.72%。与之对比,在高温反应制备的复合粉末烧结制备的块体试样中,没有出现特征晶面分布的各向异性。
The WC-Co composite powders with different particle sizes were prepared by in-situ reduction and carbonization at different temperatures, and then densified rapidly by the spark plasma sintering technique to produce dense nanocrystalline cemented carbide bulk materials. The detection and analysis of the system show that there is a high degree of orientation distribution of the WC grains in the as-densified composite powder, which is mainly composed of the carbon-deficient phase, prepared by the reaction at low temperature. The (0001) The area ratio in the direction reaches 40%, and the area fraction in the direction parallel to the pressure (0001) plane is only 10.72%. In contrast, the anisotropy of the distribution of the characteristic crystal planes did not appear in the bulk samples prepared by the composite powder sintering prepared by the high-temperature reaction.