PERMANENT MAGNET WITH INTER-GRAIN HEAVY-RARE-EARTH ELEMENT, AND METHOD OF PRODUCING SAME

    公开(公告)号:WO2019007499A1

    公开(公告)日:2019-01-10

    申请号:PCT/EP2017/066794

    申请日:2017-07-05

    Applicant: ABB SCHWEIZ AG

    Abstract: A manufacturing method of a sintered magnet is described. The method comprises 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 from at 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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