Sintering Neck Growth Model

During sintering, metal particles grow together through diffusion processes. At the contact points, so-called sinter necks form, which enlarge the contact area between the particles and thus ensure a firm bond. If diffusion doesn't work properly, the particles remain only weakly bonded. The result is a porous, brittle structure with poor strength – exactly what you don't want when welding. So make sure temperature control and time are right so that diffusion can proceed cleanly. With the right settings, you get a dense, load-bearing component.