Patent · US Active

Preservation of strain in iron nitride magnet

US11217370B2 · kind B2 · utility

2Cited by

2References

13Claims

0Family size

Assignee

Regents of the University of Minnesota · US

Inventors

Jian-Ping Wang · Shoreview, US
Yanfeng Jiang · Minneapolis, US

Key dates

Filing date	Jan 22, 2016
Grant date	Jan 4, 2022
Priority date	—
Expiry date	Jul 5, 2037

Classification

Technology area (CPC H)Electricity
CPC primaryH01F41/0253
WIPO fieldSurface technology, coating
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.