金刚石和立方氮化硼工具的电子探针研究

EPMA study of diamond and cubic boron nitride tools

运用电子探针X射线显微分析(EPMA)方法并结合XRD分析对金刚石和立方氮化硼(CBN)工具进行了研究,结果表明:在金刚石工具中,Co、Cu和Sn的元素相互均匀分布,三者形成了合金相,Co和金刚石的结合紧密程度好于Cu和Sn;金属基体与金刚石的界面上生成了一定量的Co2C,使金刚石和结合剂之间实现了冶金结合,大大增强了界面黏接强度。在立方氮化硼工具中,Sn、Ni、Cu、Co四种元素之间形成了合金,Sn、Cu、Co元素在CBN的周围均匀分布,和CBN结合紧密,但Ni和CBN界面的结合稍差一些;Co多的区域Cu相对少,Cu富集的区域Co相对少;Cu和CBN结合较好,Co和CBN在界面的结合不如Cu紧密。

Electronic Probe X -ray Microregion Analysis （EPMA） is a microregion analysis method including microscopic analysis and elements distributing analysis. In this paper, diamond tool and cubic boron nitride（CBN） tool are studied through EPMA method and the main conclusions are as follows：The elements Co, Cu and Sn;are evenly distributed and form alloys in the diamond tool; The element Co combines the diamond grains more closely than Cu and Sn;The compound Co2 C is formed on the interface between metallic matrix and diamond grains. The metallurgic combination come true between metallic matrix and diamond grains and the interface bonding strength is enhanced. In CBN tool, the elements Sn,Ni,Cu and Co form alloys, the elements Sn,Cu,Co are distributed evenly around the CBN grains and get a close combination with CBN, but the element Ni gets a slightly weak combination with CBN. There is few element Cu where Co is more dense in the CBN tool, and vice versa. The element Cu manifests a more closely combination with the CBN grains than the element Co in the interface.