METHOD FOR PRODUCING POROUS CERAMICS BASED ON TRICALCIUM PHOSPHATE BASED ON FABRICATED THREE-DIMENSIONAL MODELS BY LAYER-BY-LAYER DEPOSITION USING PHOTOPOLYMERIZATION Russian patent published in 2022 - IPC C04B35/447 A61L27/12 

FIELD: porous ceramic products production.

SUBSTANCE: invention relates to a method for producing porous ceramic products based on materials from tricalcium phosphate, intended for medical use as bioresorbable bone implants and made three-dimensional models by layer-by-layer fusing using photopolymerization. The method includes the following steps: making a mold from a thermoplastic polymer using layer-by-layer fusing on an extrusion printer, introducing a 2 wt.% lithium-containing low-melting additive into the original tricalcium phosphate powder, obtaining a suspension by mixing powdered tricalcium phosphate with a photoactive acrylic polymer, filling the mold with a suspension and subsequent photopolymerization ultraviolet radiation with a wavelength of 405 nm, debaiding and firing. Moreover, 2 wt.% of a low-melting lithium-containing additive is introduced into the initial powder of tricalcium phosphate. Then the resulting powder of tricalcium phosphate in the amount of 50-75 vol.% is mixed with liquid photoactive acrylic polymer in the amount of 25-50 vol.%, and the resulting suspension is molded into a gating mold using a spatula and photopolymerization is carried out using ultraviolet radiation of 405 nm, followed by debaiding at temperature 450°C and firing at 1200°C.

EFFECT: increase in mechanical strength up to 22±1 MPa, microhardness up to 583±29 HV and preservation of the porous structure.

1 cl, 1 dwg, 1 tbl, 2 ex