研究了铜基活性钎料钎焊立方氮化硼的焊接性与微观结构,采用真空钎焊方法实现了CuNiSnTi活性钎料与c—BN的可靠连接。多元CuNiSnTi活性钎料对c-BN和基体钢都具有较好的润湿性能,提高钎焊温度可以改善活性钎料对c—BN的润湿性。在500℃时,CuNiSnTi活性钎料钎焊的c-BN超硬耐磨涂层仍具有极好的耐磨性能,与c-BN仍能保持较高的结合强度。采用SEM,XRD对界面观察和分析,并结合键参数理论的计算结果表明,CuNiSnTi活性钎料与c-BN发生冶金作用,形成了化合物型界面。
The weldability and microstructure of Cu-based active filler metal were studied. The high-strength bonding between CuNiSnTi active filler metal and c-BN abrasive grain was realized by means of brazing in the vacuum furnace. Multicomponent Cu-based alloys containing adhesion-active titanium exhibit good wettability on c-BN and base steel. The wettability of active filler metal on c-BN was impoved by increasing brazing temperature. The superhard wear-resistant coating brazed with CuNiSnTi active filler metal possessed of an excellent wearability and good adhesion strength to c-BN at 500 ℃. The interface of filler metal/c-BN was observed and analysed by SEM and XRD. The result combined with calculation of key parameters theory show that interaction happened between CuNiSnTi active brazing alloy and c-BN to form the compound type interface.