METHOD FOR OXIDATION PROTECTION OF CARBON-CARBONIC MATERIAL Russian patent published in 2005 - IPC

FIELD: aircraft industry, power production.

SUBSTANCE: carbon-carbonic material is impregnated with mixture, containing potassium hydrophosphate, manganese hydrophosphate, phosphoric acid and water in mass ratio of (0.5-0.7):(1.0-2.8):(1.8-2.2):(10-50), respectively. Then material is dried and heat treated with temperature rising rate of 15-20°C/h up to 650-700°C to produce 2.0-5.0 mass % of ultraphosphate as calculated to starting material weight. Dried material is cooled, impregnated with mixture of furfuryl alcohol and phenol-phormaldehyde resin in mass ratio of (8.0-9.0):(1.2-2.0), respectively, heat treated again with temperature rising rate of 8-20°C/h up to 280-350°C to produce solid residual content of 0.5-5.0 mass %. Method of present invention makes it possible to reduce oxidative losses when heating at 600°C in air up to 0.1-0.25 %/h and to obtain material with compressive resistance of 120-150 MPa and long-term serviceability at 520-550°C.

EFFECT: decreased oxidation losses; material with increased compressive resistance and serviceability.

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