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US 11,915,845 B2Granted
Method for producing rare earth sintered magnet
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsTaiga Asai, Akira Fujimoto, Tetsuya Ohashi
Life of this patent
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Abstract
A rare earth sintered magnet is produced by depositing a coating of rare earth-containing particles on the surface of a rare earth magnet body, and heat treating the magnet body for causing absorption and diffusion of rare earth element in the magnet body. The depositing step utilizes a particle impingement phenomenon.
Claims6
A method for producing rare earth sintered magnet comprising the steps of:
- depositing a coating of R-containing particles on at least a portion of a surface of a rare earth magnet body;
- and
- heat treating the magnet body for causing absorption and diffusion of R in the magnet body, R being at least one element selected from rare earth elements, wherein the depositing step relies on an aerosol deposition method in which the R-containing particles are forced to impinge on the rare earth magnet body under the impetus of a differential pressure between an internal pressure of a chamber where the magnet body is held in place and a pressure of a supply for supplying the R-containing particles to the chamber, and
- the deposited coating is a porous coating and has a density which is 40 to 70% of the true density of the R-containing particles.
1 more element
Dependencies are inferred from the claim text.