Abstract The WC-Co cemented carbides with 4 wt%~14 wt% Co content were fabricated by spark plasma sintering. The effect of Co content on microstructure and mechanical properties of WC-Co cemented carbide were analyzed. The results showed that the grain size of cemented carbide with different Co content was in 220–380 nm. As the Co content increased, the density, fracture toughness and flexural strength of cemented carbide increased, but the hardness gradually decreased. The hardness decreased by approximately 1.6 GPa with per 2 wt% increase of the Co content when the Co content was below 10 wt%. The optimal comprehensive mechanical properties was optimal when Co content was 8 wt%. The hardness, fracture toughness, and flexural strength were 19.87 GPa, 12.27 MPa m1/2 and 1834 MPa, respectively. The cemented carbide fabricated in this paper are more excellent compared to the commercial cemented carbides.

中文翻译：

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Co含量对放电等离子烧结超细晶WC-Co硬质合金组织和力学性能的影响

摘要 采用放电等离子烧结法制备了Co含量为4 wt%~14 wt%的WC-Co硬质合金。分析了Co含量对WC-Co硬质合金组织和力学性能的影响。结果表明，不同Co含量的硬质合金晶粒尺寸在220-380nm之间。随着Co含量的增加，硬质合金的密度、断裂韧性和抗弯强度增加，但硬度逐渐降低。当 Co 含量低于 10 wt% 时，Co 含量每增加 2 wt%，硬度降低约 1.6 GPa。当 Co 含量为 8 wt% 时，最佳综合力学性能最佳。硬度、断裂韧性和弯曲强度分别为 19.87 GPa、12.27 MPa m1/2 和 1834 MPa。