Magnetic material and method for producing magnetic material

Patent metadata

Field	Value
Publication number	US-10043606-B2
Application number	US-201414761220-A
Country	US
Kind code	B2
Filing date	Jan 7, 2014
Priority date	Jan 16, 2013
Publication date	Aug 7, 2018
Grant date	Aug 7, 2018

Abstract

An internal structure of a magnetic material is phase-separated into at least a first phase and a second phase. At least one of the first phase and the second phase includes a compound having a perovskite structure. The first phase and the second phase include Mn, Sn, and N. According to this, it is possible to obtain a magnetic material in which magnetic properties such as a coercive force are improved. In addition, in a case where a rare-earth element is not included in elements that constitute the magnetic material, it is possible to obtain a magnetic material having corrosion resistance.

First claim

The invention claimed is:

1. A magnetic material,
wherein an internal structure is phase-separated into at least a first phase and a second phase,
at least one of the first phase and the second phase includes a compound having a perovskite structure,
the first phase and the second phase include Mn, Sn, and N,
the magnetic material is expressed by a compositional formula (Mn a Sn b X c ) 100-d N d in which a+b+c=100, 30≤a≤90, 5≤b≤35, 0≤c≤35, and 10≤d, and
the element X is at least one kind of selected from the group consisting of Co, Fe, Cr, Nb, Ga, Cu, V, Ni, Zr, Ti, Zn, and Al.

2. The magnetic material according to claim 1 ,
wherein the first phase includes at least Mn 4 N or Mn 3 SnN.

3. The magnetic material according to claim 1 ,
wherein the second phase includes at least β-Mn or α-Mn.

4. A method for producing the magnetic material according to claim 1 , the method comprising:
a melting step of melting metallic constituent elements except for nitrogen to form an alloy;
a powdering step of atomizing the alloy which is obtained in the melting step; and
a heat treatment step of subjecting a powder, which is obtained in the powdering step, to a heat treatment in an atmosphere in which a nitrogen source is contained.

5. The method for producing the magnetic material according to claim 4 , further comprising:
a molding step of compression-molding the powder that is obtained in the powdering step,
wherein in the heat treatment step, a molded body, which is obtained in the molding step, is subjected to the heat treatment in the atmosphere in which the nitrogen source is contained.

6. The method for producing the magnetic material according to claim 4 ,
wherein in the heat treatment step, the heat treatment is performed in a magnetic field.

7. A method for producing the magnetic material according to claim 1 , the method comprising:
a mixing step of mixing a nitride powder or a metal powder which includes an element that constitutes the magnetic material;
a molding step of compression-molding a powder that is mixed in the mixing step; and
a heat treatment step of subjecting a molded body, which is molded in the molding step, to a heat treatment in an atmosphere in which a nitrogen source is contained.

8. The method for producing the magnetic material according to claim 7 ,
wherein the heat treatment step, the heat treatment is performed in a magnetic field.

Assignees

• Japan Science & Tech Agency

Inventors

• Sugimoto Satoshi
• Isogai Keita

Classifications

• C23C8/02

  Pretreatment of the material to be coated (C23C8/04 takes precedence) · CPC title

• B22F2999/00

  Aspects linked to processes or compositions used in powder metallurgy · CPC title

• H01F1/053 Primary

  containing rare earth metals · CPC title

• C23C8/24

  Nitriding · CPC title

• B22F3/02

  Compacting only · CPC title