A study on induction brazing of diamond grits using both amorphous and crystalline Ni-based filler alloy

摘要

An amorphous and a crystalline Ni-based filler alloy were used in induction brazing of diamond. The method aimed at forming high chip space on the brazed diamond tool and less generating whole grain fracture of the brazed diamond grits. The melt of amorphous Ni-based filler alloy has better wetting and large climbing toward diamond than that of crystalline Ni-based filler alloy. The microstructure of the coating formed using the amorphous filler alloy is different from that of the coating formed using the crystalline filler alloy. It was found that both of the alloys provide hardness of about 3100 MPa. The grinding performance of the brazed diamond bars were tested in the same working condition. After 90 min, the percentage of whole grain fracture of the diamond grits brazed using the amorphous and crystalline filler alloy was about 8 and 20 %, respectively. At the 90th minute, the temperature of the bar brazed with the crystalline filler alloy was found to be 25 % more than that of the bar brazed with the amorphous filler alloy.