粗颗粒聚晶金刚石复合片显微结构的分析

Study on micro-structure of coarse-grained polycrystalline diamond compact

利用扫描电镜、光学影像仪等分析检测仪器,在不损伤被检样品的物理性能、状态和内部结构的条件下,从聚晶金刚石层与基体的界面结构,微观的均匀性以及金刚石层D-D键的结合情况等方面定性判断PDC性能的优劣。研究发现:金刚石和硬质合金界面结构为非平面连接时,其性能优于传统的平面结合型;PDC材料聚晶金刚石层中金刚石在空间相连形成D-D结合立体网络状结构,这是PDC材料力学性能优异的主要原因,且D-D键越多,复合片性能越好。

In this paper, the merits of PDC （ polycrystalline diamond compact） are evaluated on the basis of the interface structure between polycrystalline diamond and WC, micro-uniformity and the D-D bonding of PDC, by using scanning electron microscope and image-detection equipment etc. The samples are detected on the condition of non-damage to the physical properties, state and internal structure. Research results showed that ： the merits of the non-plane interface PDC are better than that of trad.itional plane interface ones ; The reason of PCD＇s outstanding mechanical properties is the D-D bonding with three-dimensional network structure in the diamond layer of PDC materials. Moreover,the more the D-D bonding,the better the properties of PDC.