公开(公告)号：US20170365381A1

公开(公告)日：2017-12-21

申请号：US15546387

申请日：2016-01-22

Applicant: REGENTS OF THE UNIVERSITY OF MINNESOTA

Inventor： Jian-Ping WANG ,  YanFeng JIANG

IPC: H01F1/047 ,  H01F41/02 ,  H01F1/00

CPC classification number: H01F1/047 ,  C22C38/001 ,  C23C8/02 ,  C23C8/18 ,  C23C8/24 ,  C23C8/26 ,  C23C8/60 ,  C23C8/80 ,  H01F1/0063 ,  H01F41/0253

Abstract: A permanent magnet may include a Fe16N2 phase in a strained state. In some examples, strain may be preserved within the permanent magnet by a technique that includes etching an iron nitride-containing workpiece including Fe16N2 to introduce texture, straining the workpiece, and annealing the workpiece. In some examples, strain may be preserved within the permanent magnet by a technique that includes applying at a first temperature a layer of material to an iron nitride-containing workpiece including Fe16N2, and bringing the layer of material and the iron nitride-containing workpiece to a second temperature, where the material has a different coefficient of thermal expansion than the iron nitride-containing workpiece. A permanent magnet including an Fe16N2 phase with preserved strain also is disclosed.