Cr与金刚石界面碳化物形成机理研究  

Research on formation mechanism of carbonide transition layer at the diamond interface with Cr

作　　者：邵浩明 王进保[2] 李东平[1] 

机构地区：[1]国家特种矿物材料工程技术研究中心,广西桂林5410004 [2]桂林矿产地质研究院,广西桂林541004

出　　处：《超硬材料工程》2008年第1期19-21,共3页Superhard Material Engineering

基　　金：广西壮族自治区科技厅应用基础研究专项资助项目(桂科基0731006)

摘　　要：选用含C r活性钎料,适当控制钎焊工艺,实现了金刚石与基体的高强度连接。采用扫描电子显微镜(SEM)和能谱仪(EDS)及X射线衍射结构(XRD)分析了真空加热条件下,含铬活性钎料与金刚石之间的界面反应以及界面反应产物,探讨了钎料与金刚石界面处碳化物的形成机理。分析结果表明,活性钎料中的C r在金刚石表面富集并与金刚石中的C生成枝状的碳化物,既实现了化学冶金结合,生成的碳化物呈枝状,也进一步加强了对金刚石的把持作用。The high strength bonding between diamond grit and base steel was realized by using a Cr-based active brazing filler metal under controlled brazing conditions. The interface between the Cr-based filler metal and diamond grit was analyzed by using scanning electronic microscope, energy dispersive X-ray spectroscopy and X-ray diffraction. The formation mechanism of carbide layers was discussed. Testing results show that the Cr element in the filler metal is accumulated onto diamond surface and reacts with C element to form ramiform carbide. As a result, metallurgical bonding is produced between the filler metal and the diamond grit. The form of ramiform carbide also strengthens the bonding strength between the base steel and diamond.

关 键 词：金刚石 钎焊 枝状碳化物 化学冶金结合 

分 类 号：TQ164[化学工程—高温制品工业]