METHOD FOR PRODUCING HEAT-RESISTANT RARE-EARTH MAGNETS

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FIELD : metallurgy. SUBSTANCE : invention relates to powder metallurgy, particularly, to production of heat-resistant rare-earth magnets. Magnets can be used in automation systems, industrial equipment, automobiles. Performing base alloy melting based on intermetallic compound Nd2Fe14B and alloy-additives. Alloy-additive used is an alloy of the following chemical composition : REM(Co1-yCuy), where REM is one or more elements from the group : Tb, Dy, Ho, z = 1–4; y = 0.2–0.8. Both alloys are subjected to hydride dispersion. Hydride dispersion of alloy-additive is carried out in temperature range of 500–700 °C. Then powders of both alloys are mixed and subjected to fine grinding with subsequent pressing in magnetic field. Compacts are sintered and thermally treated, at heating before sintering in vacuum, maintenance is carried out at temperature of 900–1, 000 °C for 1–2 h. EFFECT : obtained magnets have high magnetic properties. 1 cl, 4 tbl, 1 ex