CERAMIC SUSPENSION FOR 3D PRINTING AND A METHOD FOR PRODUCING COMPLEX-PROFILE SILICON CARBIDE PRODUCTS BASED ON REACTION-BONDED SILICON CARBIDE USING 3D PRINTING Russian patent published in 2022 - IPC C04B35/573 B28B1/00 B33Y10/00 B33Y70/10 

FIELD: composite materials.

SUBSTANCE: invention relates to the field of obtaining composite silicon carbide products with increased performance characteristics using additive printing. In particular, a ceramic suspension for 3D printing is proposed, containing a silicon carbide filler with carbon components and an organic binder: a solution of phenol-formaldehyde resin in furfuryl alcohol. At the same time, the filler contains 75-85 wt. % of the total weight of the silicon carbide powder filler with an average particle size of 14-50 mcm and 15-25 wt. % of the total mass of the filler carbon components. Moreover, the total content of the filler in the suspension is no less than 75%, the binder is the rest, which is a solution of 35-45 wt. % of two-stage phenol-formaldehyde resin in furfuryl alcohol. Carbon black, natural graphite, phenolic coke, soot, individually or in a mixture can be used as carbon components of the filler. A method for producing complex-profile products based on reaction-bonded silicon carbide using 3D printing is also proposed, including the preparation of a ceramic suspension for 3D printing, molding of ceramic materials by 3D printing, curing of the resulting workpiece, carbonation followed by silicification in the liquid or gas phase of silicon. At the same time, the molding of ceramic materials is carried out by the method for 3D extrusion printing. The resulting workpiece is cured according to a certain temperature regime for at least 9 hours: 2 hours at 70°C, 2 hours at 90°C, 1 hour at 120°C, 2 hours at 150°C and 2 hours at 200°C. And carbonation is carried out in an inert atmosphere with a temperature rise rate of 3.5°C/min to 950°C, with isothermal exposure at a final temperature for 30 minutes.

EFFECT: increase in the mechanical strength of the products, while the material density is at least 2.95 g/cm³, compressive strength is at least 1300 MPa, bending strength is at least 200 MPa, Young’s modulus is at least 380 GPa.

5 cl, 3 tbl, 1 dwg