Effect of Element Y on the Organization and Properties of Ni-Cr Amorphous Filler Alloy Brazed Diamond
Brazed diamond tools,characterized by their high bonding strength due to chemical metallurgical bonding,have broad application prospects in the processing of hard and brittle materials such as ceramics,semiconductors,and glass,as well as in rail transportation,aerospace,and other fields.Although Ni-based brazing filler metals have certain advantages in terms of bonding strength,wear resistance,and service environment,the high brazing temperature and chemical erosion can significantly cause thermal damage to diamond abrasive particles,affecting the work efficiency and service life of diamond tools.To reduce the thermal damage of diamond during brazing,Ni-Cr amorphous brazing filler metals doped with Y element were used to braze diamond.The microstructure of the brazed diamond sample interface was studied by SEM,and the graphitization degree of the brazed diamond sample was analyzed using a Raman spectrometer.The mechanical properties of the brazed diamond sample were also investigated.The results showed that when the mass fraction of Y element was 0.8%,the diamond morphology of the brazed sample was the most complete,with the highest hardness of the brazing layer being 533 HV0.1,a higher exposure rate of 76.2%,and a lower graphitization degree.In addition,the addition of Y element refined the size of carbides and reduced the tendency of carbide microcracks.Compared with the brazing sample without Y element,the compressive strength of diamond increased by about 50.4%,the grinding performance improved by 43.5%,and the number of diamond detachment was the least.Therefore,Y-doped Ni-Cr amorphous brazing filler metals can successfully prepare brazed diamond samples,which reduce the erosion effect of catalyst elements in the brazing filler metals on diamond,improve thermal damage and grinding performance.This study provides reliable theoretical support for the application of amorphous brazing filler metals in the field of brazed diamond tools,and provides a new technical path for related industrial production,which has certain practical significance in reducing production costs and promoting green production.
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