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金刚石粒度和掺杂量两因素对Si-Ti-B掺杂金刚石/硬质合金复合体的金刚石层的抗弯强度和耐磨性的综合影响,可以归结为平均自由程与机械性能的关系。在强度(或耐磨性)与平均自由程的关系曲线中,存在最大值。对于低掺杂量材料,强度随平均自由程(粘结相层厚度)的减少而降低。对于高掺杂量材料,强度随粘结相层厚度的增大而下降。Si-Ti-B掺杂烧结金刚石的耐热性高于钴粘结金刚石。
The combined effect of diamond particle size and doping amount on the flexural strength and wear resistance of the diamond layer of Si-Ti-B-doped diamond / cemented carbide composites can be attributed to the relationship between mean free path and mechanical properties. In the relationship between strength (or wear resistance) and mean free path, there is a maximum value. For low doping materials, the strength decreases with decreasing mean free path (thickness of binder phase). For high doping materials, the strength decreases with the increase of the thickness of the binder phase. The heat resistance of Si-Ti-B doped sintered diamond is higher than that of cobalt bonded diamond.