METHOD OF MANUFACTURE OF SINTERED ANTIFRICTION NON-POROUS IRON-BASED MATERIALS Russian patent published in 2003 - IPC

FIELD: powder metallurgy; manufacture of oil-tight and/or gas-tight antifriction parts working under heavy-duty conditions, for example, guide bushes of valves of various internal combustion engines and high-pressure hydraulic pumps, as well as sliding bearings of various transport machines and other heavy-duty machines subjected to dynamic loads. SUBSTANCE: method includes preparation of charge from mixture of metallic, non-metallic and metallized powders, compacting blank of part and impregnating briquette, followed by assembly and sintering. Compacting of blank on base of iron of preset porosity and impregnating briquette on base of copper or tin of arbitrary porosity is performed separately; sintering is performed in presence of liquid phase at simultaneous seepage by low-melting component. EFFECT: improved physico-chemical and antifriction properties. 3 cl, 1 tbl, 2 ex