Effect of Ti content in Ag–Cu–Ti activated filler metal on dissimilar joint formation of sialon and WC–Co alloy by laser brazing

Abstract

Laser brazing was carried out for dissimilar joining of sialon and a WC-Co alloy. Eutectic type Ag-Cu alloys as filler metals with different Ti content ranging from 0 to 2?8 mass-% were used to investigate the effects of Ti on the interface structure and strength of the joint. The filler metal sheet was sandwiched between a sialon block and a WC-Co alloy plate, and a laser beam was irradiated selectively on the WC-Co alloy plate. The brazed joint was obtained using the filler metal containing .0?3 mass-%Ti. TiN, Ti 5 Si 3 , and Cu 4 Ti layers were formed at the interface of sialon and brazed metal as compound layers. The shear strength of the brazed joint increased with increasing Ti content in the filler metal in the range 0?3-1?7 mass-%, reaching a maximum value of 106 MPa. However, the strength decreased when the Ti content became higher than 1?7 mass-%.

Simulation of cracking phenomena during laser brazing of ceramics and cemented carbide

“…They found that the joint strength increased after surface patterning. In a previous study, we had used dissimilar laser brazing on ceramics such as sialon, 11 silicon carbide, 12 hexagonal boron nitride, 13 diamond, 14 and graphite, 15 while using a WC–Co alloy as the metal material. The effect of the active-element content of the filler metal on the joint strength and the interfacial reaction between the ceramics and the filler metal was investigated.…”

Effect of Sn Content on Filler and Bonding Characteristics of Active Metal Brazed Cu/Al2O3 Joint

“…3. The tests were performed at a crosshead speed of 5 mm/minute using a precision universal testing machine with a 5ton press (UTM DUT-30000 CM, Dae Kyung Engineering, Korea) according to Ref[27]. The UTS and the strain values were calculated from the tensile shear stress-strain diagrams.…”