METHOD FOR PRODUCTION OF BLACK-LEADED MATERIAL Russian patent published in 2005 - IPC

FIELD: metallurgy, aircraft industry, power engineering, semiconductor technique.

SUBSTANCE: plate tar cake is ground to produce fractional makeup having at least 97 mass % of <0.09 mm-fraction and at least 91 % of <0.045 mm-fraction. Grinded cake is mixed with 35-40 % of coal-tar asphalt and 0.015-1.5 mass % of organic additive at 120-130°C. As organic additive space-hindered phenols and/or phenylphosphites are used. Obtained mass is formed, cooled and crushed followed by pressing to produce semimanufactured article with density of1.01-1.06 g/cm³. Said articles are sintered at 800-1300°C and black-leaded at 3000°C. Finished black-leaded material has bulk density of 1760-1950 kg/cm³, compression strength of 90-105 MPa and blending strength of 60-75 MPa. Material of present invention is useful in production of electrodes, seal assembly and material of high purity.

EFFECT: black-leaded material with improved physical characteristics.

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