Cemented tungsten carbides with/without metallic binders were prepared through spark plasma sintering (SPS). The coincidence site lattice grain boundaries of the materials were characterized by electron backscattered diffraction (EBSD) technology. Misorientation angle distribution and grain boundary plane orientation distributions of Σ = 2 and Σ = 13a boundaries in the above WC materials are demonstrated. The reasons for the high fraction of Σ = 2 boundaries and the weaker misorientation texture at 30° in cemented tungsten carbides without metallic binders were discussed. It was found that the binder types have little effect on the high population of Σ = 2 boundaries in spark plasma sintered pure WC, WC-Co and WC with various ceramic binders such as Al₂O₃, ZrO₂, Al₂O₃-ZrO₂ and Al₂O₃-ZrO₂-B₂O₃. In contrast, the mean grain size of WC carbides exhibits direct relation with the population of Σ = 2 boundaries. The coalescence mechanism during solid-state sintering are confirmed for eliminating the 90° boundaries and decreasing the intensity for habit planes distribution for Σ = 2 boundaries. The result support the theory that the preference of Σ = 2 low-energy boundaries in cemented carbides is rather dependent on the anisotropic surface energy of different planes than the cobalt content. This discovery facilitates to a better understanding of the origin of Σ = 2 boundaries in WC based materials.

通过火花等离子体烧结（SPS）制备了具有/不具有金属粘合剂的硬质合金碳化钨。通过电子背散射衍射（EBSD）技术表征了材料的重合点晶格晶界。对上述WC材料中的Σ= 2和Σ= 13a晶界的错配角分布和晶界面取向分布进行了说明。讨论了在没有金属粘合剂的情况下，硬质合金碳化钨中Σ= 2边界的比例高以及30°时取向差结构变弱的原因。已经发现，粘合剂类型对火花等离子体烧结纯WC，WC-Co和带有各种陶瓷粘合剂（例如Al ₂ O ₃，ZrO _2）的WC中的大量Σ= 2边界几乎没有影响。，Al ₂ O ₃ -ZrO ₂和Al ₂ O ₃ -ZrO ₂ -B ₂ O ₃。相反，WC碳化物的平均晶粒尺寸与Σ= 2边界的数量直接相关。确认了固态烧结过程中的聚结机制可消除90°边界并降低Σ= 2边界时习惯面分布的强度。该结果支持以下理论：硬质合金中Σ= 2低能边界的优先级取决于钴含量以外的不同平面的各向异性表面能。这一发现有助于更好地了解WC基材料中Σ= 2边界的起源。