METHOD OF MANUFACTURING ANTIFRICTION PARTS FROM SILICON CARBIDE Russian patent published in 2008 - IPC C04B35/573 

FIELD: antifriction materials.

SUBSTANCE: invention relates to manufacturing silicon carbide parts via reaction caking procedure, especially concerning friction elements of end seals of pump-compressor and other equipment. Silicon carbide is ground to particle size 10 μm or less and mixed with carbon black ground to particle size 0.1 μm, while using, during both wet grinding and mixing operations, (i) isopropyl alcohol surfactant in amount 0.5-1.0% based on the volume of water medium present during grinding operation and (ii) aqueous cellulose solution added 15-20 min before the end of grinding. Dried mix is supplemented by paraffin dissolved in gasoline and rectification blanks are compacted at pressure 400-500 kg/cm². Blanks are then treated in vacuum electric furnace at excessive pressures and consecutively applied temperatures: 100, 200, 300, and 400°C, during which operation temporary binder is removed. Reaction caking and impregnation of blanks are carried out in vacuum 10-3 mm Hg at 1500-1600°C.

EFFECT: obtained fine-grain structure uniformly distributed all over the bulk of parts having porosity not exceeding 1-2%.

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