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Iron nitride materials and magnets including iron nitride materials

A technology of nitrides and raw materials, applied in the direction of magnetism of inorganic materials, magnetic objects, magnetic materials, etc., can solve the problems of expensive permanent magnet manufacturing, high magnet manufacturing cost, environmental degradation, etc.

Inactive Publication Date: 2016-08-10
RGT UNIV OF MINNESOTA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These rare earth elements are relatively in short supply and may face higher prices and / or supply shortages in the future
Also, some permanent magnets containing rare earth elements are expensive to manufacture
For example, manufacturing NdFeB and ferrite magnets generally involves pulverizing the material, compressing the material, and sintering at temperatures above 1000°C, all of which contribute to the high manufacturing cost of the magnets
Plus, rare earth mining could lead to serious environmental degradation

Method used

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  • Iron nitride materials and magnets including iron nitride materials
  • Iron nitride materials and magnets including iron nitride materials
  • Iron nitride materials and magnets including iron nitride materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0264] Figure 20 An example XRD spectrum is shown for a sample prepared from first grinding an iron precursor material to form a ferrous starting material, followed by grinding the ferrous starting material in a formamide solution. During milling of the iron precursor material, the ball milling apparatus was filled with a gas comprising 90% nitrogen and 10% hydrogen. Grinding balls having a diameter of about 5 mm to about 20 mm were used for grinding, and the mass ratio of balls to powder was about 20:1. During grinding of ferrous raw materials, the ball milling device is filled with formamide solution. Grinding balls having a diameter of about 5 mm to about 20 mm were used for grinding, and the mass ratio of balls to powder was about 20:1. as in Figure 20 The upper XRD spectrum shown in , shows that after grinding the iron precursor material, an iron-containing raw material comprising Fe(200) and Fe(211) crystalline phases is formed. XRD spectra were compiled using a D5...

Embodiment 2

[0266] Figure 21 Example XRD spectra are shown for samples prepared from grinding iron-containing raw materials in acetamide solution. During grinding of the iron precursor material, the ball mill unit was filled with a gas comprising 90% nitrogen and 10% hydrogen. Grinding balls having a diameter of about 5 mm to about 20 mm were used for grinding, and the mass ratio of balls to powder was about 20:1. During grinding of ferrous raw materials, the ball milling apparatus is filled with acetamide solution. Grinding balls having a diameter of about 5 mm to about 20 mm were used for grinding, and the mass ratio of the balls to powder was about 20:1. XRD spectra were compiled using a D5005 x-ray diffractometer available from Siemens USA, Washington D.C. as in Figure 21 As shown in the XRD spectra shown in , powders of iron nitrides are formed after grinding the iron-containing raw materials in acetamide solution. Powders containing iron nitrides including Fe 16 N 2 (002), ...

Embodiment 3

[0268] Figure 22 It is for Fe containing iron prepared by continuous casting, chilling and extrusion 16 N 2 A plot of the magnetization of an example magnetic material versus an applied magnetic field. First, an iron nitride mixture comprising an iron to nitrogen atomic ratio of about 9:1 is formed by grinding iron powder in the presence of amides. The average iron particle size was about 50nm ± 5nm as measured using scanning electron microscopy. Milling was carried out in the mixture using a nickel catalyst at a temperature of about 45° C. for about 50 hours. The weight ratio of nickel to iron is about 1:5. The atomic ratio of iron to nitrogen was measured using Auger Electron Spectroscopy (AES).

[0269] The iron nitride powder was then placed in a glass tube and heated using a torch. The torch uses a mixture of natural gas and oxygen as fuel and is heated at a temperature of about 2300°C to melt the iron nitride powder. The glass tube was then laid flat and the molt...

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Abstract

The disclosure describes magnetic materials including iron nitride, bulk permanent magnets including iron nitride, techniques for forming magnetic materials including iron nitride, and techniques for forming bulk permanent magnets including iron nitride.

Description

[0001] This application claims U.S. Provisional Patent Application No. 61 / 840,213, filed June 27, 2013, entitled "TECHNIQUES FOR FORMING IRON NITRIDE WIREAND CONSOLIDATING THE SAME"; U.S. Provisional Patent Application No. 61, filed June 27, 2013 / 840,221, entitled "TECHNIQUES FOR FORMING IRONNITRIDE MATERIAL"; U.S. Provisional Patent Application No. 61 / 840,248, filed June 27, 2013, entitled "TECHNIQUES FOR FORMING IRON NITRIDEMAGNETS"; and filed February 4, 2014 The benefit of U.S. Provisional Patent Application No. 61 / 935,516, entitled "IRON NITRIDE MATERIALS AND MAGNETSINCLUDING IRON NITRIDE MATERIALS." The entire contents of US Provisional Patent Application Nos. 61 / 840,213; 61 / 840,221; 61 / 840,248; and 61 / 935,516 are hereby incorporated by reference for all purposes. technical field [0002] This disclosure relates to magnetic materials and techniques for forming magnetic materials. Background technique [0003] Permanent magnets play a role in many electromechanical sy...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F1/04
CPCH01F1/086B22F9/04B22F2998/10B22F2999/00C22C2202/02C22C38/00C22C38/001H01F1/047H01F41/0266B22F2202/01B22F3/02B22F2202/05B22F1/142B22F3/10B22F2003/248H01F41/02
Inventor 王建平姜岩峰
Owner RGT UNIV OF MINNESOTA
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