Abstract WCoB based cermet is a potential hard alloy to replace WC-Co cermets with high hardness and corrosion resistance. WCoB based cermets with different Cr doping contents were fabricated by spark plasma sintering in liquid phase sintering stage. The densification behavior, phase composition, microstructure and mechanical properties of Cr doped WCoB cermets were investigated by XRD, EDS and SEM. Due to the lower density of Cr, the density of WCoB cermets decreased with the increasing of Cr doping content. The phase composition consisted of Cr doped WCoB, unreacted W, Co–Cr binary binder phase. When the doping content exceeded 11.736 wt%, the Cr enrichment zones appeared, which was harmful to the TRS. The increasing of Cr doping content contributed to the increase of unreacted W phases content and the formation of pores. The maximum value of Vickers hardness was 1751 Hv0.5 at 9.356 wt% Cr doping content. The variation trend was explained by first principle calculation, which is consistent with Hv-Zhou hardness model.

中文翻译：

---

放电等离子烧结和第一性原理计算Cr掺杂WCoB基金属陶瓷的显微组织和力学性能

摘要 WCoB基金属陶瓷是一种具有高硬度和耐腐蚀性能的硬质合金，可替代WC-Co金属陶瓷。在液相烧结阶段通过放电等离子体烧结制备具有不同 Cr 掺杂含量的 WCoB 基金属陶瓷。通过XRD、EDS和SEM研究了Cr掺杂WCoB金属陶瓷的致密化行为、相组成、微观结构和力学性能。由于Cr的密度较低，WCoB金属陶瓷的密度随着Cr掺杂量的增加而降低。相组成由 Cr 掺杂的 WCoB、未反应的 W、Co-Cr 二元粘结相组成。当掺杂量超过 11.736 wt% 时，会出现 Cr 富集区，对 TRS 有害。Cr掺杂量的增加有助于未反应W相含量的增加和孔隙的形成。在 9.356 wt% Cr 掺杂含量下，维氏硬度的最大值为 1751 Hv0.5。变化趋势由第一性原理计算解释，与Hv-Zhou硬度模型一致。