Gm Global Technolgoy Operations, Inc.

Magnequench International, Inc.

Kevin A Young

Viswanathan Panchanathan

Larry J Eshelman

William Ray Green

Dennis L Plackard

Donald S Kirk

Joseph J Worden

Isotropic magnetic alloy powder having an intrinsic magnetic induction of at least two third of its magnetic remanence and method for making same are provided. The powder is made from an alloy having a composition comprising, by weight percentage, approximately 15 to 35 percent of one or more rare earth metals, approximately 0.5 to 4.5 percent of boron, and approximately 0 to 20 percent of cobalt, balanced with iron. The alloy powder is made by a process wherein an amount of the alloy is melt and spun in an inert environment, preferably at a distance between an orifice and a wheel being less than one and one half inches, into ribbons, followed by crushing the ribbons into powder and annealing the powder.

Isotropic rare earth material of high intrinsic induction

This invention describes a practice for the hot pressing and/or hot working of rare earth element-containing alloy powders using open-to-the-air presses. The rare earth-containing powder is pressed into a compact at ambient temperatures using a solid lubricant only on the die wall. This compact is then hot pressed in an open air press utilizing a heated die flooded with argon.

Hot pressed magnets in open air presses

A method is provided for comminuting and mechanically magnetically orienting particles of hot worked rare earth-transition metal-boron alloy to make bonded anistropic magnets. The method involves comminuting a hot-worked body of the alloy to form platelet shaped particles, and applying pressure to the particles in a die in the absence of an external magnetic field.

Method of making self-aligning anisotropic powder for magnets

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Fairmount, IN, United States of America

Kevin A Young