Resin printer for ceramics fabrication: Challenges and Scope
NEGI S. 1, BHARGAVA P. 1, GANDHI P. 1
1 IIT Bombay, Mumbai, India
Digital Light Processing (DLP) is a vat photopolymerization-based process used to fabricate ceramic parts by curing ceramic powder-loaded photosensitive slurry. In the photosensitive ceramic slurries, 40-60 vol % is monomer that polymerizes after light irradiation (405-460 nm wavelength) and acts as a binder for ceramic particles. During polymerization, acrylate-based polymers shrink by 7-10 vol %. This shrinkage depends on the amount of energy provided through light exposure to the slurry. The shrinkage accompanying polymerization also affects the ceramic particle packing in the green body. The present work reports results on challenges posed by differences in ceramic powder particle packing within a single part on obtaining desired geometry. Shrinkage has been utilized to achieve controlled density gradients in the fabricated ceramic parts. For this work, an in-house developed slurry with 40 volume % ceramic loading has been used.