METHOD OF MANUFACTURE OF STRUCTURAL GRAPHITE Russian patent published in 2005 - IPC

FIELD: chemical industry and special-purpose technique; manufacture of large-sized blanks of shaped articles for chemical and heat-exchange apparatus.

SUBSTANCE: starting coke-filler is mixed with coal-tar pitch and is impregnated with it; then mixture is calcined at temperature of 1100°C and ground to size not exceeding 1.25 mm at content of particles of no more than 0.07 mm in the amount not exceeding 50%. For obtaining fine-grained materials, grinding is continued till particles of 0.5 mm have been obtained. Powder thus obtained is mixed with pitch and blanks are molded from hot coke-pitch mass by extrusion through tip or in mold, after which blanks are subjected to roasting and graphitization. After roasting and graphitization, blanks may be again impregnated with coal-tar pitch and subjected to repeated roasting. Density of material thus made ranges from 1.65 to 1.78 g/cm³, compressive strength ranges from 30.0 to 51.3 Mpa and bending strength ranges from 16 to 26.4 Mpa.

EFFECT: avoidance of rejects.

3 cl, 3 ex