Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1991-05-21
1992-07-07
Sheehan, John P.
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148101, H01F 102
Patent
active
051279703
ABSTRACT:
A method for improving the magnetic properties, particulaarly intrinsic coercivity, of particles of a permanent magnet alloy comprising a rare earth element, iron and boron. The method includes subjecting particles to a hydrogen atmosphere for a time at elevated temperature sufficient to hydride the particles. The hydrogen atmosphere is removed while maintaining the particles at the elevated temperature. Thereafter, while maintaining the particles at elevated temperature, the particles are subjected to a vacuum atmosphere for a time at the maintained elevated temperature sufficient to dehydride the particles. Thereafter, while maintaining the particles at the elevated temperature, they are again subjected to a hydrogen atmosphere for a time at the maintained elevated temperature sufficient to hydride the particles. The hydrogen atmosphere is removed while maintaining the particles at the elevated temperature. Thereafter, the particles are subjected to a vacuum atmosphere for a time at the maintained elevated temperature sufficient to dehydride the particles. The dehydrided particles are then cooled to room temperature.
Crucible Materials Corporation
Sheehan John P.
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