METALLURGICAL COMPOSITION OF PARTICULATE MATERIALS, SELF-LUBRICATING SINTERED PRODUCT AND PROCESS FOR OBTAINING SELF-LUBRICATING SINTERED PRODUCTS

摘要

31METALLURGICAL COMPOSITION OF PARTICULATE MATERIALS, SELF-LUBRICATING SINTERED PRODUCT AND PROCESS FOR OBTAINING SELF-LUBRICATING SINTERED PRODUCTS5 AbstractThe metallurgical composition comprises a main particulate metallic material, for example iron or nickel, and at least one alloy element for hardening the10 main metallic material, which form a structural matrix (10); a particulate solid lubricant (20), such as graphite, hexagonal boron nitride or mixture thereof; and a particulate alloy element which is capable of forming, during the sintering of the composition conformed by15 compaction or by injection molding, a liquid phase, agglomerating the solid lubricant (20) in discrete particles. The composition may comprise an alloy component to stabilize the alpha-iron matrix phase, during the sintering, in order to prevent the graphite20 solid lubricant from being solubilized in the iron. The invention further refers to a self-lubricating sintered product, obtained from the composition, and to the process for obtaining said product.25 FIG. 4 METALLURGICAL COMPOSITION OF PARTICULATE MATERIALS, ELF-LUBRICATING SINTERED PRODUCT AND PROCESS FOR OBTAI ING SELF-LUBRICATING SINTERED PRODUCTSAbstractThe metallurgical composition co rises a main particulate metallic material, for '-xample iron or nickel, and at least one alloy elemen for hardening the10 main metallic material, which form a structural matrix (10); a particulate solid lubr cant (20), such as graphite, hexagonal boron nitrid or mixture thereof; and a particulate alloy element wIrch is capable of forming, during the sintering of th composition conformed by15 compaction or by injectio molding, a liquid phase, agglomerating the solid lubricant (20) in discrete particles. The compos tion may comprise an alloy component to stabili e the alpha-iron matrix phase, during the sintering, in order to prevent the graphite20 solid lubricant frs being solubilized in the iron. The invention further refers to a self-lubricating sintered product, obtai d from the composition, and to the process for ob aining said product.