Patent ID: 6793742
Filing Date: 2004-09-21
Classification: B22F,C22C,H01F

Abstract:
A method for preparing an alloy for bonded rare earth magnets, comprising the steps of:melting an alloy consisting essentially of 20 to 30% by weight of R which is samarium or a mixture of at least two rare earth elements (inclusive of Y) containing at least 50% by weight of samarium, 10 to 45% by weight of iron, 1 to 10% by weight of copper, 0.5 to 5% by weight of zirconium, and the balance of cobalt, quenching the melt by a strip casting technique, to form a rare earth alloy strip containing at least 20% by volume of equiaxed crystals with a grain size of 1 to 200 &mgr;m and having a gage of 0.05 to 3 mm, heat treating the strip in a non-oxidizing atmosphere at 1000 to 1300Â° C. for 0.5 to 20 hours, followed by aging treatment and grinding.