LASER-MATTER INTERACTION MODEL OF LASER BEAM MELTING APPLIED TO OXIDE CERAMICS AND COMPARISON WITH METALLIC ALLOY

摘要

Laser Beam Melting (LBM) of ceramics offers new design possibilities of complex structures with good oxidation and temperature resistances. Poor absorptivity in near infra-red wavelength of oxide ceramics is overcome with addition of a sorbent to ceramic powder. Laser-powder bed interactions are characterized through an interaction model that was carried out from variation of melt pool dimensions with linear energy. Optical properties, interaction diameter and energy limits of materials are evaluated. The effects of laser, powder bed nature and sorbent parameters on laser-matter interactions are assessed. Proof is made that laser interaction with ceramics shows a different behavior compared to metals. In addition, beneficial addition of optimum sorbent content is confirmed for stable construction of ceramics.