中文摘要：

在Ag—Cu—Ti合金中加入一定量的TiC颗粒制成复合钎料，进行细粒度金刚石磨粒与45钢基体的真空钎焊实验。运用三维视频显微镜、扫描电镜和x射线衍射仪分析TiC颗粒、Ag-Cu—E合金和金刚石磨粒之间的结合界面。结果表明tTiC颗粒能有效降低试验工艺下Ag—Cu-Ti合金在基体表面的流动性和结晶时产生的隆起，复合钎料在基体表面分布更趋平整，有利于细粒度金刚石钎焊等高性的控制；适量TiC颗粒在结合剂层中的均匀分布，能显著细化结合剂层的显微组织；复合钎料中添加TiC颗粒在实现细粒度金刚石磨粒与钢基体钎焊连接的同时，有效抑制了钎料合金对细粒度金刚石磨粒过度浸润所造成切削刃的包裹．保证了细粒度金刚石磨粒良好的出露。

英文摘要：

The vacuum brazing experiments of fine diamond abrasive grains to steel （0.45 % C） using Ag- Cu-Ti alloy reinforced by TiC particles were carried out. The interfacial microstructure and characteristics among TiC particles, Ag-Cu-Ti alloy, fine diamond grains and the steel substrate were detected with three-dimensional video microscope, scanning electron microscope（SEM） and X-ray diffraction（XRD）. The results show that the microstructure of Ag-Cu-Ti alloy is refined obviously by the well-dispersive TiC particles. The interfacial zone between the particles and the filler is uniform and compact. Good combination between the grains and the substrate can be obtained when the TiC particles are applied. And the flow resistance resulting from the TiC particles ensures the high protrusion of fine grains.