Title: Method to synthesize bulk iron nitride

Abstract

Bulk iron nitride can be synthesized from iron nitride powder by spark plasma sintering. The iron nitride can be spark plasma sintered at a temperature of less than 600°C. and a pressure of less than 600 MPa, with 400 MPa or less most often being sufficient. High pressure SPS can consolidate dense iron nitrides at a lower temperature to avoid decomposition. The higher pressure and lower temperature of spark discharge sintering avoids decomposition and limits grain growth, enabling enhanced magnetic properties. The method can further comprise synthesis of nanocrystalline iron nitride powders using two-step reactive milling prior to high-pressure spark discharge sintering.

Inventors:

Monson, Todd; Lavernia, Enrique J.; Zheng, Baolong; Zhou, Yizhang

Issue Date:

2018-05-08

Research Org.:

Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)

Sponsoring Org.:

USDOE

OSTI Identifier:

1440536

Patent Number(s):

9963344

Application Number:

15/002,220

Assignee:

National Technology & Engineering Solution of Sandia, LLC (Albuquerque, NM)

Patent Classifications (CPCs):

C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01B - NON-METALLIC ELEMENTS

C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01P - INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

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C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01B - NON-METALLIC ELEMENTS

C01B21/0622 - {with iron, cobalt or nickel}

C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01P - INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

C01P2004/62 - Submicrometer sized, i.e. from 0.1-1 micrometer
C01P2004/64 - Nanometer sized, i.e. from 1-100 nanometer

C - CHEMISTRY C04 - CEMENTS C04B - LIME, MAGNESIA

C04B2235/3852 - Nitrides, e.g. oxynitrides, carbonitrides, oxycarbonitrides, lithium nitride, magnesium nitride
C04B2235/405 - Iron group metals
C04B2235/5436 - micrometer sized, i.e. from 1 to 100 micron
C04B2235/5454 - nanometer sized, i.e. below 100 nm
C04B2235/656 - characterised by specific heating conditions during heat treatment
C04B2235/666 - Applying a current during sintering, e.g. plasma sintering [SPS], electrical resistance heating or pulse electric current sintering [PECS]
C04B2235/77 - Density
C04B2235/81 - Materials characterised by the absence of phases other than the main phase, i.e. single phase materials
C04B35/58042 - {based on iron group metals nitrides}
C04B35/62615 - {High energy or reactive ball milling}
C04B35/6264 - {Mixing media, e.g. organic solvents}
C04B35/645 - Pressure sintering

H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01F - MAGNETS

H01F1/086 - {sintered}

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DOE Contract Number:  

AC04-94AL85000

Resource Type:

Patent

Resource Relation:

Patent File Date: 2016 Jan 20

Country of Publication:

United States

Language:

English

Subject:

36 MATERIALS SCIENCE