Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1989-09-06
1992-07-14
Sheehan, John P.
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148101, 148277, 148286, 148287, 419 12, 419 35, 419 38, 419 44, H01F 102
Patent
active
051299640
ABSTRACT:
A process for preparing a permanent magnet is disclosed. The process comprises the steps of exposing material, in particulate form, and having an overall composition comprising 8 to 30 atomic percent of a first constituent selected from the group consisting of rare earth metals, 42 to 90 atomic percent of a second constituent selected from the group consisting of transition metals and 2 to 28 atomic percent of a third constituent selected from the group consisting of substances from Group III of the Periodic Table, to hydrogen gas under conditions such that hydrogen gas is absorbed by the material, exposing the hydrided material, in particulate form, to oxygen or an oxygen-containing gas in an amount and for a period of time sufficient to passivate the material, and compacting the material. Also disclosed are products from this process, namely, passivated, hydrided particles, alloy compacts formed of passivated, hydrided material and permanent magnets, having superior properties.
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Sheehan John P.
SPS Technologies, Inc.
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