真空钎焊无镀覆和镀钛金刚石磨粒的实验研究  

Experimental research on vacuum brazing of Ti-coated diamond and un-coated diamond abrasives

作　　者：邵浩明[1] 王进保[1] 孙浩[2] 

机构地区：[1]国家特种矿物材料工程技术研究中心 [2]桂林工学院,广西桂林541004

出　　处：《超硬材料工程》2008年第4期7-10,共4页Superhard Material Engineering

基　　金：广西区应用基础研究资助项目(桂科基0731006)

摘　　要：以Ni-Cr合金为钎料,对无镀膜和表面镀钛两种金刚石进行钎焊研究,实现了金刚石与钢基体的高强度连接。SEM和EDS等分析结果表明在一定的钎焊温度、时间及真空度下,钎料与两种金刚石均形成化学冶金结合。钎焊后无镀膜金刚石表层碳化物沿金刚石法线方向生长;而镀钛金刚石表层碳化物的生长方向为金刚石切线方向。对两种式样进行磨削实验发现,Ni-Cr合金对金刚石有很强的"把持力",在磨削过程中金刚石出现宏观破损,无金刚石脱落现象。The high-strength bonding between steel matrix and diamond was obtained by using Ni-Cr alloy as brazing filler metal and operating brazing study on un-coated diamond and Ti-coated diamond. The analytical results of SEM and EDS have shown that chemical bonding takes place on the interface between filler and the two kinds of diamonds under certain brazing temperature, duration and vacuum level. After brazing, the surface carbonide of un-coated diamond grew along normal direction, while the surface carbonide of Ti-coated diamond grew along tangent direction. According to grinding experiment on both diamonds, it has found that Ni-Cr brazing filler metal has a strong retention to diamond, because there is no loss of diamond but macro-fracture during the grinding process.

关 键 词：金刚石 真空钎焊 镀覆 碳化物 把持力 宏观破损 

分 类 号：TQ164[化学工程—高温制品工业]