The effects of adding different nano-alumina on the structure, mechanical properties and wear resistance of WC-8Co cemented carbide during spark plasma sintering (SPS sintering) were investigated. The results show that the nano-alumina is dissolved in the Co phase, which results in a larger proportion of FCC-Co in the γ phase on the surface of the WC-Co cemented carbide. Under the scanning electron microscope, it is observed that the grains of cemented carbide are refined, and when the addition amount is 0.5 wt%, the effect of WC grain refinement is the most significan. The hardness, flexural strength and fracture toughness showed a trend of increasing first and then decreasingwith nano-alumina added. The peak value is reached when the nano-alumina content is 0.5 wt%, Which means that the alloy has the best combination of mechanical properties, that is, hardness reaches 1716 HV₃₀, bending strength reaches 2728 MPa, and fracture toughness is 12.95 MPa·m^1/2. Adding nano-alumina is beneficial to improve the wear resistance of cemented carbide. As a matter of course, when the content of nano-alumina is 0.5 wt%, the friction coefficient is the lowest, the wear rate is the smallest, and the wear resistance is the best.

研究了在火花等离子烧结（SPS烧结）过程中添加不同的纳米氧化铝对WC-8Co硬质合金的结构，力学性能和耐磨性的影响。结果表明，纳米氧化铝溶解在Co相中，这导致WC-Co硬质合金表面的γ相中FCC-Co的比例更大。在扫描电子显微镜下，观察到硬质合金的晶粒细化，并且当添加量为0.5wt％时，WC晶粒细化的效果最显着。随着纳米氧化铝的加入，硬度，弯曲强度和断裂韧性呈现出先升高后降低的趋势。当纳米氧化铝含量为0.5 wt％时达到峰值，这意味着该合金具有最佳的机械性能组合，_{如图30所示}，弯曲强度达到2728MPa，断裂韧性为12.95MPa·m ^1/2。添加纳米氧化铝有利于提高硬质合金的耐磨性。当然，当纳米氧化铝的含量为0.5wt％时，摩擦系数最低，磨损率最小，耐磨性最佳。