Method to synthesize bulk iron nitride

United States Patent

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9,963,344
May 8, 2018
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Synthesis of Nanocrystalline Iron Nitrides Using Two-Step Reactive Milling Process
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.degree. 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.
15/002,220
January 20, 2016
1/1;
C04B 35/58 (20060101); H01F 1/08 (20060101); C04B 35/645 (20060101); C04B 35/626 (20060101); C01B 21/06 (20060101);
STATEMENT OF GOVERNMENT INTEREST This invention was made with Government support under contract no. DE-AC04-94AL85000 awarded by the U.S. Department of Energy to Sandia Corporation. The Government has certain rights in the invention.