Si3N4 slurry with high solid phase, low viscosity prepared via surface-oxidation and silane coupling agent modification hybrid method

The significant disparity in refractive index between silicon nitride (Si3N4) powder and resin poses a formidable challenge in the formulation of stable ceramic slurry with high solid content and low viscosity. This research paper systematically investigates the oxidation pretreatment of Si3N4 powder and the modification process of the silane coupling agent, with a particular focus on their impacts on the rheological and curing properties of the ceramic slurry. Furthermore, the study thoroughly examines the effects of various functional group resin compounds, dispersant types, and dosages on the rheological and curing properties of the ceramic slurry. By optimizing the surface modification process of silicon nitride (Si3N4) and formulating an appropriate composition for the silicon nitride (Si3N4) slurry, this paper successfully prepares a Si3N4 ceramic slurry with outstanding curing performance, low viscosity, and a solid content of 44 vol%. The application of photocuring molding technology enables the production of Si3N4 ceramic components characterized by high precision, excellent surface quality, and intricate geometries. Moreover, this study establishes a comprehensive understanding of the relationship between the refractive index of silicon nitride ceramic slurry and essential parameters, including photocuring process variables and slurry properties. This achievement provides valuable technical guidance for the preparation and printing of silicon nitride ceramic slurry.