镀Mo金刚石与结合剂之间的结合状态研究

Bonding Condition between Mo-coated Diamonds and Matrices

本文利用抗弯强度试验、扫描电镜及能谱分析研究了镀Mo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：在700－840℃热压条件下，结合剂中的主要组元均已扩散到达金刚石表面；Mo镀层采与金刚石形成强的界面结合；在抗弯强度试验中，Mo层基本上与结合剂一起被剥离金刚石表面。金刚石表面镀Mo后，其Fe基、Ni基、Cu基复合材料的抗弯强度均下降，而其Co基复合材料的抗弯强度显著上升。抗弯强度的变化主要是由于Mo对结合剂的局部强化、硬化并由此引起的复合材料内部的热应力的改变以及Mo层改变了结合剂对金刚石的浸润等因素引起的。

The bonding condition achieved by hot-pressing iron-based, nickel-based, cobalt-based and copperbasedpowers with Mo-coated diamonds (by megnetron sputter Mo) has ben Studied by means of Transverse Rupture Strength(TRS) tesing, SEM and EDAX. It is shown that the main elements (Fe, Ni, Co, Cu) of the Inatrices has diffused to diamondsurfaces and casused most of the coatings scale off the diamond grits. The Mo-coaing is ouly effective in improving TRS incobalt-based matrix, the reason of which was also disoussed in the paper.