METHOD FOR PRODUCING LEAD-FREE PIEZOCERAMICS USING 3D PRINTING Russian patent published in 2023 - IPC C04B35/46 C04B35/622 C04B35/634 B33Y70/10 

FIELD: powder metallurgy.

SUBSTANCE: invention relates to the field of powder metallurgy, in particular, to methods for producing materials by methods of three-dimensional printing and to titanate-based lead-free piezoceramics. Proposed is a method wherein powders of barium titanate, barium zirconate, and calcium titanate are mixed in proportions equimolar to the final composition corresponding to the formula (Ba_0.825Ca_0.175)(Zr_0.10Ti_0.90)O₃ with a binder in order to form a suspension, so that the proportion of powder in the suspension is 45% vol. The suspension is then loaded into a 3D printing apparatus where layer-by-layer light-curing moulding is conducted at a power of the LED lamp of 300 MJ/cm² with the duration of illumination of 120 s for the base layers and 20 s for the subsequent layers, wherein the speed of lifting is set at 2 mm/s for the platform, and the speed of levelling the layer with a scraper is set at 0.8 mm/s, providing a 50 mcm thick layer. The resulting "green models" are then exposed to UV radiation with a power of 200 MJ/cm² for 10 minutes, then placed in a furnace where the binder is burned at a temperature of 300°C in air and the holding time is 24 hours, wherein reaction sintering is conducted at 1,400°C in an air atmosphere and the holding time is 5 hours.

EFFECT: development of a method for producing objects from lead-free piezoceramic materials with high operational characteristics by a faster and more efficient method for manufacturing.

1 cl, 3 dwg, 1 ex