Additive manufacturing using vat photopolymerization has gained attention for creating intricate ceramic parts. Digital light processing (DLP) is known for its high resolution and speed, but achieving stable ceramic suspensions with high solids concentration and low viscosity is challenging. This study investigated the impact of different dispersants on the rheology and stability of photopolymerizable suspensions. A commercially available water-washable resin, along with three dispersants (Castament FS 10, Triton-X, and DISPERBYK-111), and reactive alumina powder were used to formulate various ceramic suspensions. Viscosity and stability measurements determined the most efficient dispersant and concentration for DLP ceramic part production. Results showed that suspensions with DISPERBYK-111 had optimal viscosity and stability. However, the commercial resin presented higher viscosity, limiting solid loading to 40 vol.% alumina. Successful printing trials were conducted using a commercial printer. The alumina parts were thermally treated at 1550ºC, resulting in ceramics with a good surface finish, well-defined and adhered printed layers, 53.3% relative density, 19.65% XY shrinkage, and 13.69% Z-axis shrinkage.

O grês porcelanato possui excelentes propriedades como: resistência mecânica, química, elevada dureza, etc. Atualmente, vários estudos de novos materiais estão sendo realizados, como por exemplo, a incorporação de resíduos industriais sem a mudança do processo ou qualidade do produto final. O objetivo deste trabalho foi estudar a possibilidade do uso de um resíduo de vidro em massas cerâmicas para produção de grês porcelanato. Foram preparadas misturas contendo diferentes quantidades de argila, resíduo de vidro na forma de pó, feldspato e quartzo moído. As amostras foram queimadas em diferentes temperaturas entre 1000-1250°C, com isoterma de 30 minutos. As amostras queimadas foram caracterizadas e a composição contendo feldspato e pó de vidro como fundentes, apresentaram as melhores propriedades mecânicas e tecnológicas. A adição de resíduo de pó de vidro mostrou ser um eficiente fundente, pois além de acelerar o processo de densificação durante a queima do produto cerâmico, este material pode substituir o feldspato que é um mineral em estágio de exaustão.

Porcelain stoneware has excellent technical characteristics such as flexural strength, chemical resistance, surface hardness, etc. Nowadays, it has been realized research of new materials, for example non-hazardous wastes, that are able to replace the traditional fluxing agents without change the process or quality of the final products. The aim of this work is to study the possibility of the use of glass powder waste, in ceramic masses, for manufacturing of porcelain stoneware tiles. It was prepared mixtures containing different amounts of clay, glass waste, feldspar and quartz. The samples were fired reaching different maximum temperatures in the range 1000-1250°C, with a soaking time of 30 minutes. The fired samples were characterized and the composition containing feldspar and glass powder waste, as fluxing agents, presented the best mechanical and technological properties. The addition of glass powder showed to be an efficient fluxing agent because this material can accelerate the densification process during firing and besides that, it can substitute feldspar which is becoming exhausted.