Study of the morphology and properties of diamond joints brazed with carbide-reinforced Cu-Sn-Ti filler metal

Cu-Sn-Ti brazing filler is a new type of copper-based brazing filler for brazing diamond tools currently used in industry, but it suffers from poor wear resistance, high brazing temperature and low bond strength. This paper provides a way to improve the strength of diamond-brazed joints by adding zirconium carbide and tungsten carbide reinforcing phase particles to the Cu-Sn-Ti alloy, respectively. Diamond particles were attached to Q460 steel using Cu-Sn-Ti composite filler with the addition of the reinforcing phase, and experimental instruments such as scanning electron microscope, X-ray diffractometer and energy spectrometer were used to investigate the brazed joint performance of the composite brazing material for brazing diamond. The results show that the addition of enhanced phase particles resulted in a metallurgical reaction at the joint of the composite brazed diamond, achieving a higher strength joint with no obvious cracks at the interface, while the addition of 15 wt.% WC resulted in excellent wear resistance and the highest hardness at the joint interface.