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US 5,183,494 AGranted
Process for manufacturing rare earth-iron-boron permanent magnet alloy powders
AssigneeIndustrial Technology Research Instiute
InventorsTi Y. Liu, Chi J. Chen, Shou H. Chen
Life of this patent
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Abstract
A process for producing rare earth-iron-boron permanent magnet alloy powders comprising; heating pellets comprising a mixture of rare earth oxides, iron power, ferroboron powder and calcium grandules for reaction/diffusion to obtain a rare earth-iron-boron alloy of uniform composition, crushing the resulting alloy to form a powder and contacting the powder with an aqueous solution of acetic acid containing a non-ionic surfactant and an alkai metal acetate.
Claims6
A process for producing rare earth-iron-boron permanent magnetic alloy powders comprising the steps of:
- a) heating pellets comprising a mixture of rare earth metal oxides, iron powder, ferroboron powder and calcium granules to a temperature of from about 800 to about 1300.degree. C. for reaction/diffusion under an inert atmosphere to obtain a rare earth-iron-boron alloy of uniform composition,
- b) powdering the resulting alloy to powders of from about 10 to about 60 mesh;
- c) contacting said powders with an agitated aqueous solution of acetic acid containing a non-ionic surfactant and an alkali metal acetate.
Dependencies are inferred from the claim text.