Cu-Sn-Ti钎料的改性设计及性能分析

钎料对钎焊金刚石工具的界面结合强度起决定作用。在Cu-Sn-Ti预合金钎料中添加Fe、Al、Si粉末制作预混合钎料，利用兼有上下界的极端顶点混料设计方法，确定17种钎料配比方案，并制作剪切样件和钎焊金刚石样件，通过剪切实验评价钎料的力学性能，使用SEM、EDS和Raman对基体界面、金刚石形貌和金刚石界面进行分析。试验结果表明:Cu-Sn-Ti的质量分数低于95%时，预混合钎料剪切强度明显降低，每种添加元素的质量分数应控制在2%以下；Cu-Sn-Ti钎料中，添加Fe、Al、Si的质量分数均为1.7%的预混合钎料熔点适宜、流淌性适中，磨粒出刃性好，对金刚石无损伤，且在金刚石界面有树枝状致密TiC生成，具有较好的综合性能。 

Modification design and performance analysis of Cu-Sn-Ti solder

The pre-mixed filler metal is made by adding Fe, Al and Si elements in the Cu-Sn-Ti pre-alloy filler metal. 17 kinds of proportioning schemes are determined by using the extreme vertex mixture design method with both upper and lower bounds. The mechanical properties of the solders were evaluated by the shear test. The interface of the matrix, the morphology of diamond and the interface of diamond were analyzed by SEM, EDS and Raman. The test results show that the shear strength of the pre-mixed filler metal decreases obviously when the mass fraction of Cu-Sn-Ti is below 95%, and the mass fraction of each addition should be under 2%. The premixed solder made of Fe, Al, Si with the same mass fraction of 1.7% added in Cu-Sn-Ti have better comprehensive performance, the melting point and the flow ability are suitable, the abrasive grain edge is good, the diamond is not damaged and the dendritic compact TiC is formed on the interface of diamond.