METHOD OF PRODUCING HOT-PRESSED SILICON CARBIDE CERAMICS Russian patent published in 2024 - IPC C04B35/575 C04B35/626 

FIELD: chemistry.

SUBSTANCE: invention relates to inorganic chemistry, specifically to production of silicon carbide materials and articles. Obtained hot-pressed silicon carbide ceramics can be used as heat-shielding, chemical- and wear-resistant materials, mainly used in aviation and space engineering, machine building, electronic, chemical and petrochemical industry. Disclosed method of making articles from hot-pressed silicon carbide involves mixing silicon carbide powders with particle size of 100–400 nm, obtained by self-propagating high-temperature synthesis, and a sintering additive Al₂O₃-Y₂O₃-ZrO₂ in planetary mill for 1 hour in isopropyl alcohol, drying the mixture, rubbing through a sieve No. 0063, adding 3 wt.% of 10% aqueous solution of polyvinylpyrrolidone, preliminary one-sided uniaxial pressing in metal mould at pressure of 50 MPa. Annealing of workpieces is carried out in the temperature range of 1,700–1,800 °C at pressure of 30 MPa by hot pressing in a graphite mould for 60 minutes.

EFFECT: obtaining ceramics of a denser structure with high level of strength, microhardness and modulus of elasticity.

1 cl, 3 ex