METHOD OF PRODUCING ARTICLES FROM SINTERED COMPOSITES Russian patent published in 2015 - IPC C04B35/5831 C04B35/5835 C04B35/573 

FIELD: process engineering.

SUBSTANCE: invention relates to silicon carbide-based structural materials used in oil production and processing industries (end seals, oil pumps, downhole pumps, bearings, etc). Proposed process comprises forming of the billet based on fine filler as the powder of cubic boron nitride or boron carbide and temporary binder. Formed billet is annealed at final temperature corresponding to that of complete removal of volatile products from temporary binder, and siliconizing. This compound uses the mix of said powders with carbon of silicon-active variety with particle size of not over 20 mcm (ash or colloidal graphite) as aforesaid fine filler. Siliconizing after annealing is performed by vapour-liquid-phase process at capillary condensation of silicon vapours at billet heating to 1300-1500°C. Cubic boron nitride or boron carbide and carbon in the mix are taken in the amount of 70-80 and 20-30 wt %.

EFFECT: higher hardness and strength of composite.

2 cl, 1 tbl