Floating of SiC particles in a Zn–Al filler metal

Bonding and strengthening mechanism of ultrasonically soldered 7075 Al joint using Ni-foam/Sn composite solder foil

“…7b-7d The Ni3Sn4 phase has the same density as the Sn solder, and, although an open structure, the reticulated Ni skeleton can inhibits the floating of particles. Moreover, fine particles would be expected to float at a lower velocity than large size particles [30]. Thus, the amount of particles formed can be stable in their homogenous distribution in the soldering seam when the ultrasonic vibration stops.…”

Nomograms for rapid assessment of particle sedimentation behaviour in liquid phase processing of particle reinforced metal composites

“…The equation (12) permits the determination of the particle diameter d P related to a certain particle volume fraction V f , which provides the same terminal velocity as the composite with the particle size d P,0 and particle volume fraction V f,0 . This would be useful to prepare a variety of particle reinforced MMCs of identical sedimentation behaviour.…”

“…The density mismatch often leads to settling or floating, inhomogeneous reinforcement distribution, and formation of particle enriched and particle denuded zones in composite castings especially at slow cooling rates and/or in large section thicknesses. [3][4][5][6][7][8][9][10][11][12] Such non-uniformity severely impairs the casting characteristics (e.g. fluidity) as well as the physical, mechanical, tribological and other properties that depend upon uniformity of reinforcement distribution and on type, size and volume fraction of the reinforcing particles.…”

“…Examples of the effect of particle size and volume fraction on settling rate in composite slurries from several published studies [6][7][8][9][10][11][12] are shown in Fig. 1b.…”

“…6-12 on measured settling velocity V exp of SiC particles in Al-Si and Zn-Al matrices: parameter ln (V exp /d p 2) is plotted as function of SiC volume fraction V f ; here d p is nominal diameter of SiC reported in each studies; in SiC/Zn-Al system,12 V exp is flotation velocity as SiC (r53190 kg m 23 ) is lighter than Zn-Al melt (r56530 kg m 23 )…”