(581a) Titania Powders in the Selective Laser Sintering Processes
In this work, mixtures of titania powders with different particle size distributions were employed. They were obtained by mixing a coarser grained powder (particles in the range 10 - 100 microns) with a finer grained powder (particles in the submicron range). The powder composition and the powder laying procedure were studied and optimized in order to obtain specimens with of the desired mechanical properties. The equipment used is a three dimensional laser sintering equipment using a 40W CO2 laser beam purposely built. The density and the mechanical resistance of the specimens are studied as a function of the fines content and of the amount of energy released by the laser beam on the unit surface of the lighted area. A simple theoretical modelling approach is also used to estimate the strength of the single sintered contact.