Patent · US Active

Iron nitride powder with anisotropic shape

US11511344B2 · kind B2 · utility

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1References
15Claims
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Assignee

Inventors

Key dates

Filing dateJan 8, 2020
Grant dateNov 29, 2022
Priority date
Expiry dateJul 10, 2040

Classification

  • Technology area (CPC B)Performing Operations; Transporting
  • CPC primaryB22F2999/00
  • WIPO fieldMaterials, metallurgy
  • WIPO sectorChemistry

Abstract

Techniques are disclosed for milling an iron-containing raw material in the presence of a nitrogen source to generate anisotropically shaped particles that include iron nitride and have an aspect ratio of at least 1.4. Techniques for nitridizing an anisotropic particle including iron, and annealing an anisotropic particle including iron nitride to form at least one α″-Fe16N2 phase domain within the anisotropic particle including iron nitride also are disclosed. In addition, techniques for aligning and joining anisotropic particles to form a bulk material including iron nitride, such as a bulk permanent magnet including at least one α″-Fe16N2 phase domain, are described. Milling apparatuses utilizing elongated bars, an electric field, and a magnetic field also are disclosed.

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