Preparation of WC cemented carbide without metallic binder toughened by MgO-B2O3?via?spark plasma sintering at 1400 [1400℃放电等离子烧结制备MgO-B2O3增韧无金属黏结相WC硬质合金]

作者：Lai J.; Li J.; Zhu D.; Liang L.; Qu S.; Li X.

来源：Journal of Materials Engineering, 2022, 50(11): 73-80.

DOI：10.11868/j.issn.1001-4381.2021.000441

• B2O3
• mechanical property
• MgO
• microstructure evolution
• sintering mechanism
• sintering temperature
• WC

In order to reduce the sintering temperature and obtain higher fracture toughness of WC cemented carbides without metallic binder, WC cemented carbide was toughened by MgO and B2O3. Dense WC-MgO-B2O3?bulk materials were prepared at the relative low temperature of 1400℃?via?spark plasma sintering(SPS), and the effects of MgO-B2O3?addition on sintering mechanism, microstructure evolution and mechanical properties of WC cemented carbides without metallic binder were studied. The results show that the addition of MgO-B2O3?promotes the sintering densification of WC, and reduces the sintering temperature of WC cemented carbides without metallic binder. With the increase of MgO-B2O3?contents, the morphology of some second phases in the microstructure is gradually transformed from short rod-shaped to long rod-shaped, and then to aggregated block. When MgO-B2O3?content reaches 8% (mass fraction), the bulk material has better fracture toughness of (9.45±0.37) MPa·m1/2, and its hardness is (18.16±0.17) GPa.

• 单位
  华南理工大学