Compressive Strength and Interface Microstructure of PCBN Grains Brazed with High-Frequency Induction Heating Method

Abstract

In order to prepare monolayer brazed superabrasive wheels, the polycrystalline cubic boron nitride (PCBN) grains were brazed to AISI 1045 steel matrix with Ag-Cu-Ti filler alloy using the high-frequency induction heating technique. The compressive strengths of brazed grains were measured. Morphology, chemical composition and phase component of the brazing resultant around PCBN grain were also characterized. The results show that the maximum compressive strength of brazed grains is obtained in the case of brazing temperature of 965°C, which does not decrease the original grain strength. Strong joining between Ag-Cu-Ti alloy and PCBN grains is dependent on the brazing resultants, such as TiB 2 , TiN and AlTi 3 , the formation mechanism of which is also discussed. Under the given experimental conditions, the optimum heating parameters were determined to be current magnitude of 24 A and scanning speed of 0.5 mm/s. Finally, the brazing-induced residual tensile stress, which has a great influence on the grain fracture behavior in grinding, was determined through finite element analysis.

Effect of Gold Nano Dots in Microwave Brazing: A Novel Approach to Join Ti6Al4V to MACOR^®

“…Joining of ceramics to metal is mostly done by active metal brazing. The active metal like titanium facilitates wetting of ceramics to form a metallic interface that facilitates brazing with other metals [7,8]. The initial study of joining MACOR ® with Ti was performed by Rocha et al [9]where they used active metal braze alloy as interlayer.…”