中文摘要：

用含钴量为16％（质量分数）的硬质合金YG16作为基体提供钴源，对平均粒度为8gm的WC初始材料进行氢气还原脱氧处理，以减少合成样品中的杂质，通过高压融渗法烧结低钴粗晶硬质合金。重点研究了烧结压力、温度和烧结时间等条件对烧结体性能的影响，通过控制适当的工艺条件得到高硬度值的低钴粗晶合金，并对合成的硬质合金层进行X射线衍射（XRD）、扫描电镜（SEM）及硬度检测。实验结果表明，在4．5GPa、1400℃、40min下合成样品的碳化钨晶粒形貌呈现球形或椭球形，其硬度值可达17．4GPa，表面钴含量为5．7％。

英文摘要：

We investigated the high pressure infiltration sintering of coarse grained cemented carbide with low cobalt content, where WC-16% Co （mass fraction） substrate was used to provide cobalt. The initial WC powder was prepared with vacuum hydrogen reduction in order to isolate the oxygen impurity. This paper mainly studied the effects of such sintering conditions as pressure, temperature and sintering time on the properties of the sintered body, and a high hardness value was obtained by controlling the sintering process. The sintered WC-Co samples were characterized by X-ray diffraction （XRD）, scanning electron microscope （SEM） and Vickers hardness tests. The scanning electron microscopy （SEM） analysis reveals that the WC grains in well sintered alloys are round in shape and the sintered WC-CO alloy with a cobalt content of 5.7 exhibits a high hardness value of 17.4 GPa.