Diffusion bonding of electroless Ni plated WC composite to Cu and AISI 316 stainless steel

Abstract

In this study, a composite containing WC (Tungsten Carbide) and Ni was produced by two different processing routes. Electroless Ni coated WC powders were consolidated and sintered at 1200 • C. Diffusion bonding couples of WC(Ni)-electrolytic Cu, WC(Ni)-AISI 316 stainless steel and WC(Ni)-WC(Ni) were manufactured by using a preloaded compression system under Ar atmosphere. Diffusion bonding was carried out at varying bonding temperatures; 750 • C for (WC)Ni-Cu diffusion couple and 1200 • C for (WC)Ni-(WC)Ni and (WC)Ni-AISI 316 stainless steel diffusion couples. Standard metallographic techniques, Scanning Electron Microscopy and a shear test were employed to characterize the microstructure of bondline and mechanical properties of each diffusion couple, respectively.

Formability of laser welded steel/magnesium dissimilar metal with Sn powder-adhesive interlayer

“…Up to now, various welding techniques have been used for steel and magnesium connections, including solid-state connection technologies such as friction stir welding [8][9][10][11], diffusion welding [12,13], and ultrasonic spot welding [14,15], as well as fusion welding technology, for instance, resistance spot welding [16], MIG welding [17], and composite heat source welding [18][19][20], However, these welding techniques are of limited use in practical industrial applications. As for the application of laser sources [21], which have the characteristics of a large temperature gradient, high energy density, high efficiency, good process repeatability, and narrow heat-affected zone, they are widely used in dissimilar metal welding in recent years [22,23], Miao et al [24] studied the laser brazing welding technique with steel and magnesium, and they found that steel/magnesium metallurgical bonding can be achieved because steel reacts with alloying elements of magnesium alloy to form a diffusion layer.…”