中文摘要：

以超细碳化钨（WC）、氯化钴（CoCl2.6H2O）和柠檬酸钠（C6H5O7Na3.2H2O）为原料,水合肼（N2H4.H2O）为还原剂,使用液相还原法制备超细WC-Co硬质合金粉末,并通过低压烧结使其致密化,制得力学性能良好的WC-Co硬质合金。考察了反应体系温度对硬质合金粉包覆率、反应时间对包覆效果的影响,采用SEM、TEM、XRD等手段对硬质合金粉进行了表征,确定了制备超细WC-Co硬质合金粉的优化工艺条件,并对比了不同规格的WC-Co硬质合金烧结体的力学性能。结果表明,此方法制得的WC-Co硬质合金粉纯度高,粒径均匀,无团聚,低压烧结后所得硬质合金烧结体力学性能良好。

英文摘要：

In this paper,liquid phase reductive method was used to prepare superfine WC-Co hard alloy powder with WC,CoCl2·6H2O and C6H5O7Na3·2H2O as raw materials and N2H4·H2O as reductant.Density the powder by sinter-HIP,and WC-Co hard alloy powder was prepared with fine mechanical properties.The temperature of the system and the reaction time was explored to study coating rate of hard alloy.SEM,TEM,XRD were applied to characterize the hard alloy.Optimization conditions were ensured to prepare WC-Co hard alloy powder.Different sizes and different ways of sintering were compared to affect the mechanical properties of the hard alloy.Result showed that： the WC-Co hard alloy prepared with this method is of high purity,uniform particles and without reunion.Hard alloy after Sinter-HIP is of fine mechanical properties.