Iron nitride permanent magnet and technique for forming iron nitride permanent magnet
AssigneeRegents of the University of Minnesota
InventorsJian-Ping Wang, Shihai He, Yanfeng Jiang
Life of this patent
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Abstract
A permanent magnet may include a Fe16N2 phase constitution. In some examples, the permanent magnet may be formed by a technique that includes straining an iron wire or sheet comprising at least one iron crystal in a direction substantially parallel to a <001> crystal axis of the iron crystal; nitridizing the iron wire or sheet to form a nitridized iron wire or sheet; annealing the nitridized iron wire or sheet to form a Fe16N2 phase constitution in at least a portion of the nitridized iron wire or sheet; and pressing the nitridized iron wires and sheets to form bulk permanent magnet.
Claims15
A system comprising:
- a strain inducing apparatus configured to exert a strain on an iron wire or sheet in a direction substantially parallel to a majority of the <001> axes of body centered cubic (bcc) iron crystals of the iron wire or sheet;
- a first heating apparatus configured to heat the strained iron wire or sheet;
- a source of an atomic nitrogen substance configured to expose the strained iron wire or sheet to the atomic nitrogen substance to form a nitridized iron wire or sheet;
- and
- a second heating apparatus configured to heat the nitridized iron wire or sheet to a temperature sufficient to anneal the nitridized iron wire or sheet to form a Fe16N2 phase constitution in at least a portion of the nitridized iron wire or sheet;
- and
- a press configured to compress a plurality of nitridized iron wire or sheets comprising a Fe16N2 phase constitution to form a unitary permanent magnet including a Fe16N2 phase constitution.
Dependencies are inferred from the claim text.