烧结磨轮用铜基钎料真空预钎焊金刚石的性能研究  

Performance of the pre-brazed diamond abrasive grains with Cu-Sn-Ti alloy under vacuum atmosphere used for grinding wheel

作　　者：夏斯伟[1] 马若飞 段端志[1] 李文杰[1] 

机构地区：[1]南京航空航天大学机电学院,南京210016 [2]苏州南航腾龙科技有限公司,苏州215163

出　　处：《超硬材料工程》2013年第6期1-5,共5页Superhard Material Engineering

摘　　要：采用铜锡钛(Cu-Sn-Ti)合金钎料并选用合适的隔离剂在加热温度930℃的工艺下对金刚石磨粒进行真空预钎焊处理,在烧结工艺条件下使用预钎焊磨粒制作预钎焊金刚石磨轮,并进行常规磨轮、预钎焊磨轮磨削对比试验。通过磨粒力学性能测试分析了预钎焊磨粒性能,借助扫描电镜分析了预钎焊磨粒的界面微结构。试验表明:选用D粉作隔离剂的铜基预钎焊金刚石磨粒表面生成了均匀的预钎焊金属层,隔离效果好,磨粒力学性能损失小;预钎焊磨粒与胎体之间界面处呈Ti元素偏聚富集,Fe、Cu等元素相互扩散状态,界面形成了化学冶金结合;预钎焊磨轮加工性能优于常规磨粒磨轮,铜基预钎焊磨轮锋利度高,综合加工性能最好。Pre-brazed diamond abrasive grains were fabricated using diamond abrasive, Cu-Sn-Ti alloy,and appropriate isolation agent at the heating temperature of 930 ℃ in vacuum resistance furnace.Pre-brazed diamond grinding wheels were fabricated using the pre-brazed diamond abrasive grains,metal matrix and steel matrix.The grinding per-formance of the pre-brazed diamond grinding wheels was investigated and compared with the conventional diamond grinding wheel.The mechanical property of the pre-brazed grains was measured.The interfacial microstructure of the pre-brazed grains and the pre-brazed diamond wheel block fracture surface were characterized.The results show that the surface metal layer of the pre-brazed diamond abrasive grains using D powder as isolation agent is uniform and the loss of mechanical property is greatly reduced.Ti mainly concentrates within the interface between the pre-brazed diamond abrasive grains and metal matrix and induces the chemical combination interface generated.The pre-brazed diamond grinding wheels exhibits better grinding performance compared with the conven-tional diamond grinding wheel.The pre-brazed diamond grinding wheels using Cu-Sn-Ti alloy exhibits best grinding performance.

关 键 词：预钎焊金刚石磨粒 铜锡钛合金 力学性能 微结构 金刚石磨轮 

分 类 号：TG454[金属学及工艺—焊接]