METHOD OF PRODUCING R-T-B SINTERED MAGNET

Disclosed is a method for producing a magnet, including a step of preparing a magnet represented by the formula: uRwBxGayCuzAlqM(balance)T, where RH is 5% or less, 0.20 ¤ x ¤ 0.70, 0.07 ¤ y ¤ 0.2, ¤ z ¤ 0.5, ¤ q ¤ 0.1; when 0.40 ¤ x ¤ 0.70, v and w satisfy the following inequality expressi...

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Hauptverfasser:	KUNIYOSHI, Futoshi, YAMAGATA, Ryouichi, ISHII, Rintaro, SATOH, Teppei
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ALLOYS BASIC ELECTRIC ELEMENTS CASTING CHEMISTRY ELECTRICITY FERROUS OR NON-FERROUS ALLOYS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS INDUCTANCES MAGNETS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS MAKING METALLIC POWDER MANUFACTURE OF ARTICLES FROM METALLIC POWDER METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PERFORMING OPERATIONS POWDER METALLURGY SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES TRANSFORMERS TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS WORKING METALLIC POWDER
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Beschreibung
Zusammenfassung:	Disclosed is a method for producing a magnet, including a step of preparing a magnet represented by the formula: uRwBxGayCuzAlqM(balance)T, where RH is 5% or less, 0.20 ¤ x ¤ 0.70, 0.07 ¤ y ¤ 0.2, ¤ z ¤ 0.5, ¤ q ¤ 0.1; when 0.40 ¤ x ¤ 0.70, v and w satisfy the following inequality expressions: 50w - 18.5 ¤ v ¤ 50w - 14, and -12.5w + 38.75 ¤ v ¤ -62.5w + 86.125; and, when 0.20 ¤ x < 0.40, v and w satisfy the following inequality expressions: 50w - 18.5 ¤ v ¤ 50w - 15.5 and -12.5w + 39.125 ¤ v ¤ -62.5w + 86.125, and x satisfy the following inequality expression: -(62.5w + v - 81.625)/15 + 0.5 ¤ x ¤ -(62.5w + v - 81.625)/15 + 0.8; a high-temperature heat treatment step of heating the magnet to a temperature of 730°C or higher and 1,020°C or lower, and then cooling to 300°C at a cooling rate of 20°C/min; and a low-temperature heat treatment step of heating the magnet to a temperature of 440°C or higher and 550°C or lower.