Ultrafine WC-10Co cemented carbides with different Cr₂(C,N) inhibitor contents and different-scaled WC powders were prepared by low-pressure sintering. Their influence on the microstructure and mechanical performances were investigated and expounded in this work. The result shows that the Cr₂(C,N) addition homogenized the microstructure of the cemented carbides and refined WC grains. With the Cr₂(C,N) addition increasing, hardness increased to 1870 kg/mm², transverse rupture strength (TRS) first increased to 4435 MPa and then sharply decreased to 3230 MPa due to the existence of more pores with excessive Cr₂(C,N). With the reduction of WC particle size, the mean WC grain size and mean free path of Co phase decreased, while the contiguity of the WC grains increased. The hardness and TRS of the specimens reduced, while fracture toughness increased. The comprehensive mechanical properties namely the TRS, hardness, and fracture toughness in the cemented carbides with 0.5 wt% Cr₂(C,N) and 0.4 μm WC powder, were 4748 MPa, 1786 kg/mm², 10.1 MPa· m^1/2, respectively. A good combination of high TRS and hardness could be obtained in the cemented carbides by adopting appropriate amount of Cr₂(C,N) and reducing the WC particle size.

通过低压烧结制备了具有不同Cr ₂（C，N）抑制剂含量和不同尺度的WC粉的超细WC-10Co硬质合金。在这项工作中，研究和阐述了它们对显微组织和力学性能的影响。结果表明，Cr ₂（C，N）的添加使硬质合金和细化的WC晶粒的组织均匀化。随着Cr ₂（C，N）添加量的增加，硬度增加到1870 kg / mm ²，横向断裂强度（TRS）首先增加到4435 MPa，然后由于存在更多的含有过量Cr _2的孔而急剧下降到3230 MPa。（C，N）。随着WC粒度的减小，平均WC粒度和Co相的平均自由程减小，而WC晶粒的连续性增加。样品的硬度和TRS降低，而断裂韧性提高。的综合机械性能即TRS，硬度和断裂韧性的硬质合金与0.5重量％的Cr ₂（C，N）和0.4微米的WC粉末，分别为4748兆帕，1786公斤/毫米²，10.1兆帕·米^{1 / 2}，分别。通过采用适量的Cr ₂（C，N）并减小WC粒度，可以在硬质合金中获得高TRS和硬度的良好组合。