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利用抗弯强度试验、扫描电镜及能谱分析研究了镀TiN金刚石在Fe基、Ni基、Cu基及Co基结合剂中的界面结合状态。结果发现，金刚石表面镀TiN后，其Fe基、Ni基和Cu基复合材料的抗弯强度均下降，而Co基复合材料抗弯强度上升。在Fe基和Ni基中，镀TiN的金刚石与基体之间的断裂主要发生在TiN的外表面，同时Fe、Ni等主要元素已扩散到金刚石表面，造成TiN层局部剥离金刚石。在Cu基和Co基中，镀TiN金刚石与结合剂之间的断裂主要发生在TiN层外侧的结合剂中，TiN层保存完整，其中Co基结合剂在TiN表面附着最均匀，这与TiN在Co基结合剂中溶解度小且扩散速度慢等有关。
The interfacial bonding of TiN-coated diamond in Fe-based, Ni-based, Cu-based and Co-based binders was studied by flexural strength test, SEM and EDS. The results show that the bending strength of Fe-based, Ni-based and Cu-based composites decreases after TiN coating on diamond, while the bending strength of Co-based composites increases. In the Fe-based and Ni-based, the fracture between the TiN-coated diamond and the matrix mainly occurs on the outer surface of the TiN. At the same time, the main elements such as Fe and Ni have diffused to the diamond surface, resulting in partial delamination of the diamond in the TiN layer. In the Cu-based and Co-based, the fracture between the TiN-coated diamond and the bonding agent mainly occurs in the bonding agent outside the TiN layer, the TiN layer is well preserved, and the Co-based bonding agent is most uniformly adhered on the TiN surface, Co-based binder solubility and diffusion speed is slow and so on.