Journal de la métallurgie des poudres et des mines

Abstrait

Extrusion of Materials for Additive Ceramic Fabrication Using a PolymerFree Binder for Ceramic Precursors

Jong Wan Ko

The high polymeric concentration of the ceramic feedstock materials has made additive manufacturing of thick ceramic items difficult. However, the binder and additives have remained in the polymeric composition despite numerous studies to enhance the ceramic percentage in the feedstock. The use of a sol-gel-based ceramic slurry without the addition of polymeric additives is described as a revolutionary method for highly dense additive manufacturing [1-2]. The most popular fine ceramic substance, alumina, was used as a stand-in for ceramics. The proposed sol-gel solution met the requirements for material extrusion process, such as extrudable viscosity (100 Pa.s) and self-sustainable yield stress, while enabling a high solid loading of roughly 50% vol% without any polymeric dispersion. During the sintering process, this brand-new sol-gel binder system transforms into aluminium oxide nanoparticles that finally fuse to the alumina particles. The as-printed green body had a higher alumina content and a theoretical density of 66%, compared to the conventional moulding methods' results, which were lower. Additionally, a high density of 99.5% of the theoretical value and a reduced linear shrinkage of less than 16% were attained. This study would outline a workable plan for ceramic additive manufacturing as a developing fabrication technique.