2001 Volume 42 Issue 2 Pages 309-315
Semisolid processing using laser irradiation was proposed to fabricate porous media. This processing is based on semisolid processing and rapid prototyping technology. In the processing, laser irradiation is used to produce the semisolid state in objective particles. The particles can remain their spherical shape due to high viscosity of the semisolid state. The liquid phase in the semisolid particles locally flows into gap between the particles and consequently the particles are joined to each other. Porous media were experimentally fabricated for constantan, chromel, pure copper and Cu–5 mol%Ag alloy by using the proposed processing. The range of laser power and irradiation time to fabricate porous media became wider as the temperature range in which the semisolid state was obtained was larger. Preheating the green particles also increased the fabrication range. The large latent heat of metallic alloys contributed to the fabricability of porous media. The proposed semisolid processing using laser irradiation can fabricate porous media of metallic alloys with three-dimensional shape.