摘要
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 bending strength and abrasion resistance of diamond layer of Si-Ti-B doped diamond/cemented carbide composites depend on both the diamond particle size and the dopant content. The relationships between the mechanical properties and the diamond particle size, dopant content are considered as the relationships between properties and the mean free path. A maxi-mun was found in the bending strength (or abrasion resistance) vs. mean free path plot. The bending strength decreases with decreasing mean free path (binder layer thickness) to the direct contact of diamond particles. The bending strength decreases with increasing binder layer thickness is attributed to that the strength and hardness of binder (SiC, TiC) are lower than that of diamond. The heat-resistance of Si-Ti-B doped diamond is higher than that of cobalt bonded diamond.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
1991年第5期442-446,共5页
Journal of University of Science and Technology Beijing
关键词
金刚石
掺杂
硬质合金
复合体
diamond, Si-Ti-B dopant, cemented carbide, mean free path
