MATERIAL FOR RARE-EARTH PERMANENT MAGNETS AND ITS PRODUCTION PROCESS Russian patent published in 2001 - IPC

FIELD: electronic and computer engineering, and acoustics; actuators and monitors of disk drives and printers, miniature loudspeakers, focusing systems. SUBSTANCE: process for manufacturing high-power permanent magnets based on rare-earth alloys such as those based on neodymium-iron-boron alloy includes melting of alloys, production of powders from alloys, mixing and crushing of powders, their compaction in magnetic field, sintering of compacted powders, and their heat treatment. Use is made of three types of alloys; first type is base ferromagnetic and magnetically- hard alloy based on neodymium-iron-boron system introduced in alloy mixture in the amount of at least 85 mass percent; second type of magnetic alloy is introduced in alloy mixture in the amount of up to 10 mass percent; third type is nonmagnetic easy-melting alloy introduced in alloy mixture in the amount of up to 5 mass percent. In this way, material obtained has microstructure incorporating three elements: element A (first type of alloys), element D that functions as nonmagnetic insulating interlayer (second type of alloys), and element C constituting magnetically-hard layer (third type of alloys). EFFECT: enhanced residual flux density and maximal energy product at high coercitive force of permanent magnets. 16 cl, 1 dwg, 9 tbl, 4 ex