METHOD FOR PRODUCING STRUCTURAL CERAMICS BASED ON REFRACTORY CARBIDES FOR PRODUCTS OF COMPLEX GEOMETRY Russian patent published in 2024 - IPC C04B35/573 C04B35/632 B29C33/40 

FIELD: ceramic materials.

SUBSTANCE: invention relates to the field of creating structural ceramic materials based on refractory carbides for the manufacture of heat-resistant products of complex geometry, which can be used in mechanical engineering, marine and aviation engineering. Ceramic powder based on refractory carbides is subjected to cladding with 5-7 wt.% carbon-containing component using stirring in a vibration grinder for 15-30 minutes. For cladding, a mechanical mixture of large 40-60 mcm and small 3-10 mcm carbide particles, inert to silicon and silicon carbide during reaction sintering, is used, at a ratio of 3/1 by weight. Into composite ceramic powder at the temperature of 70-90°C, a plasticizer based on a paraffin-wax composition is introduced in an amount of 15-20 wt.%. The hot slip is subjected to vacuum with stirring for 0.5-1 hour. A hollow model of an injection mould with a wall thickness of 400-600 mcm is made from water-soluble plastic using an additive method using FDM printing. The slip is hot cast into a soluble injection mould under a pressure of about 3-5 bar. The ceramic blank is removed by dissolving the casting mould in an aqueous medium, dried, the plasticizer is removed and sintered in the presence of high-purity silicon at a temperature of 1500-1600°C for 10-20 minutes.

EFFECT: production of thin-walled, high-strength products of complex geometry with a wall thickness of no more than 1 mm with phase uniformity and stability up to temperatures of 1200°C when working in a vacuum.

4 cl, 1 ex, 2 dwg