Permanent magnet with inter-grain heavy-rare-earth element, and method of producing same

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United States of America Patent

PATENT NO 11830645
APP PUB NO 20200143963A1
SERIAL NO

16732426

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Abstract

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A manufacturing method of a sintered magnet is described. The method includes forming a pre-sintering body from a first magnetic powder and a second magnetic powder (containing a heavy rare earth element, HRE) so that at least part of the second magnetic powder is provided at at least one inner portion of the pre-sintering body and surrounded format least two opposite sides by the first magnetic powder; sintering the pre-sintering body; and annealing the sintered pre-sintering body at an annealing temperature lower than the sintering temperature, thereby causing inter-grain diffusion of HRE from the HRE reservoir zone to the grain boundary phase. After the annealing, the grain boundary phase contains the HRE in a higher concentration than the main phase.

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Patent Owner(s)

Patent OwnerAddress
ABB SCHWEIZ AG5400 BADEN

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Herrmann, Lorenz Windisch, CH 7 3
Jacimovic, Jacim Wettingen, CH 13 28
Simon, Reinhard A Baden-Daettwil, CH 2 17
Tomse, Tomaz Ljubljana, SI 2 23

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