MIXTURE OF CERAMIC MATERIAL FOR HIGH-TEMPERATURE USE IN OXIDATIVE MEDIA Russian patent published in 2013 - IPC C04B35/565 C04B35/111 C04B35/443 

FIELD: chemistry.

SUBSTANCE: invention relates to production of material for high-temperature use based on refractory oxygen-free and oxide compounds, characterised by high strength, thermal and oxidation resistance, resistance to thermal shock at temperature gradient of up to 2000 K in conditions of a high-speed oxidative stream. The composite ceramic material for high-temperature use in oxidative media is made from a mixture containing SiC, Y₂O₃, Al₂O₃ and/or Al₂O₃·MgO, with the following ratio of components (wt %): SiC 76-80, Y₂O₃ 4-5, Al₂O₃ and/or Al₂O₃·MgO - the balance. The obtained ceramic material has the following characteristics: density of up to 99% of theoretical density, bending strength 400±25 MPa, compression strength 1200±40 MPa, Vickers hardness 25-27 GPa, Kl_c - 8.5-10.0 MPa·m^1/2, oxidation resistance ≤0.015 mg/cm²s, operating temperature 1800°C.

EFFECT: enabling use of said ceramic material at high temperature under the combined action of mechanical and thermal loads in oxidative media conditions.

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