Cast parts with enhanced wear resistance

B - Operations – Transporting – 22 – D

Patent

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Details

B22D 19/02 (2006.01) B22D 19/06 (2006.01) B22D 19/08 (2006.01)

Patent

CA 2468352

The invention concerns a cast wear part with its structure reinforced by at least a type metal carbide, and/or metal nitride, and/or boride, and/or metal oxides, and/or intermetallic compounds, referred to below as constituents. The invention is characterized in that the raw materials used as reagents for said constituents have been introduced in a mould (1) before casting in the form of compacted powder inserts or preforms (3) or the form of slurries (4), and the reaction of said powders has been activated in situ by casting a metal, forming a porous conglomerate in situ, and said metal has infiltrated the porous conglomerate, thus forming a reinforced structure leading to inclusion of said constituents in the structure of the metal used for casting, thereby creating a reinforcing structure on the wear part (2).

La présente invention se rapporte à une pièce d'usure réalisée en fonderie à structure renforcée par au moins un type de carbure métallique, et/ou de nitrure métallique, et/ou de borure, et/ou d'oxydes métalliques, et/ou de composés intermétalliques, ci-après dénommés les composants, caractérisée en ce que les matières premières servant de réactifs pour lesdits composants ont été introduits dans un moule (1) avant la coulée sous forme d'inserts ou de préformes de poudres compactées (3) ou sous forme de barbotines (4), en ce que la réaction desdites poudres a été amorcée in situ par la coulée d'un métal, formant un conglomérat poreux in situ, et en ce que ledit métal a infiltré le conglomérat poreux, constituant ainsi une structure renforcée pour aboutir à une inclusion desdits composants dans la structure du métal utilisé pour la coulée, en créant ainsi une structure de renfort sur la pièce d'usure (2).

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