摘要:
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。
关键词:
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金刚石
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TiN镀层
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结合剂
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界面
Abstract:
The bonding conditon achieved by hot-pressing iron-based, nickel-based, copper-based and cobalt-based powders with TiN-coated diamonds has been studied by means of Transverse Rupture Strength(TRS) testing, SEM and EDAX. It is shown that the TRS is reduced by coating diamond with TiN in iron-based, nickel-based and copper-based competes. In iron or nickel based composites, the fracture mostly occurred on the TiN-matrix interface, and the main elements (Fe,Ni etc.) has diffused to diamond surface and caused small pert of the coating scale off the diamond. In copper- based and cobalt-based composites, the fracture mostly occurred in the matrix,and TiN coatings has been kept intact and the TiN surface was evenly coated by cobalt-matrix in the fracture surface.TiN has a very small solubility and its velocity of diffusion is the cobalt-based matrix.
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