FeNi ordered alloy and method for manufacturing FeNi ordered alloy

Patent metadata

Field	Value
Publication number	US-11313004-B2
Application number	US-202017097085-A
Country	US
Kind code	B2
Filing date	Nov 13, 2020
Priority date	Oct 14, 2015
Publication date	Apr 26, 2022
Grant date	Apr 26, 2022

Abstract

A method for manufacturing FeNi ordered alloy having a L1 0 type order structure is provided. After a nitrification process for nitriding a powder sample of a FeNi disordered alloy arranged in a tube furnace is performed using a NH 3 gas, a de-nitrification process for removing a nitrogen from the FeNi disordered alloy which is processed by the nitrification process is performed using a H 2 gas. Thus, the L1 0 type FeNi ordered alloy with a regularity defined by S equal to or higher than 0.5 is obtained.

First claim

The invention claimed is:

1. An FeNi ordered alloy powder comprising:
an L1 0 order crystal structure; and
a regularity defined by S, which is equal to or higher than 0.5, wherein:
the regularity is defined by a X ray diffraction measurement.

2. The FeNi ordered alloy powder according to claim 1 , wherein:
the regularity S is obtained by an equation of:

S
=

(

I
sup

⁢

/

⁢

I
fund

)

obs

(

I
sup

⁢

/

⁢

I
fund

)

cal

I sup indicates an integral intensity of a peak in a super lattice diffraction in the X ray diffraction measurement;
I fund indicates an integral intensity of a peak in a fundamental diffraction in the X ray diffraction measurement;
(I sup /I fund ) obs indicates a ratio between the integral intensity of the super lattice diffraction and the integral intensity of the fundamental diffraction in the X ray diffraction measurement for FeNi ordered alloy constituting the FeNi ordered alloy powder; and
(I sup /I fund ) cal indicates a ratio between the integral intensity of the super lattice diffraction and the integral intensity of the fundamental diffraction in the X ray diffraction measurement for FeNi ordered alloy having the regularity S of 1.

3. The FeNi ordered alloy powder according to claim 1 , wherein:
a X ray diffraction pattern in the X ray diffraction measurement includes a diffraction peak from a (001)-plane as the super lattice diffraction and a diffraction peak from a (111)-plane as the fundamental diffraction;
the diffraction peak from the (001)-plane has an integral intensity of a peak which is defined by ∫(001);
the diffraction peak from the (111)-plane has an integral intensity of a peak which is defined by ∫(111);
a diffraction strength ratio between the integral intensity of the peak defined by ∫(001) and the integral intensity of the peak defined by ∫(111) is obtained by an equation of:
∫(001)/∫(001)×100; and

the diffraction strength ratio is equal to or larger than 0.4.

4. The FeNi ordered alloy powder according to claim 1 , wherein:
a composition range of Fe in the FeNi ordered alloy powder is disposed between 47 atomic % and 55 atomic %.

5. The FeNi ordered alloy powder according to claim 1 , wherein:
a volume average diameter of the FeNi ordered alloy powder is equal to or larger than 50 nanometers.

6. A magnetic material comprising:
the FeNi ordered alloy powder according to claim 1 .

7. An FeNi ordered alloy powder comprising:
an L1 0 order crystal structure; and
a regularity defined by S, which is equal to or higher than 0.5, wherein:
the regularity is defined by a X ray diffraction measurement; and
a volume average diameter of the FeNi ordered alloy powder is equal to or larger than 30 nanometers.

8. The FeNi ordered alloy powder according to claim 7 , wherein:
the regularity S is obtained by an equation of:

S
=

(

I
sup

⁢

/

⁢

I
fund

)

obs

(

I
sup

⁢

/

⁢

I
fund

)

cal

I sup indicates an integral intensity of a peak in a super lattice diffraction in the X ray diffraction measurement;
I fund indicates an integral intensity of a peak in a fundamental diffraction in the X ray diffraction measurement;
(I sup /I fund ) obs indicates a ratio between the integral intensity of the super lattice diffraction and the integral intensity of the fundamental diffraction in the X ray diffraction measurement for FeNi ordered alloy constituting the FeNi ordered alloy powder; and
(I sup /I fund ) cal indicates a ratio between the integral intensity of the super lattice diffraction and the integral intensity of the fundamental diffraction in the X ray diffraction measurement for FeNi ordered alloy having the regularity S of 1.

9. The FeNi ordered alloy powder according to claim 7 , wherein:
a X ray diffraction pattern in the X ray diffraction measurement includes a diffraction peak from a (001)-plane as the super lattice diffraction and a diffraction peak from a (111)-plane as the fundamental diffraction;
the diffraction peak from the (001)-plane has an integral intensity of a peak which is defined by ∫(001);
the diffraction peak from the (111)-plane has an integral intensity of a peak which is defined by ∫(111);
a diffraction strength ratio between the integral intensity of the peak defined by ∫(001) and the integral intensity of the peak defined by ∫(111) is obtained by an equation of:
∫(001)/∫(001)×100; and

the diffraction strength ratio is equal to or larger than 0.4.

10. The FeNi ordered alloy powder according to claim 7 , wherein:
a composition range of Fe in the FeNi ordered alloy powder is disposed between 47 atomic % and 55 atomic %.

11. A magnetic material comprising:
the FeNi ordered alloy powder according to claim 7 .

Assignees

• Denso Corp

Inventors

• Kura Hiroaki
• Goto Sho
• Hayashi Yasushi

Classifications

• B22F1/00

  Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties · CPC title

• C21D3/08 Primary

  Extraction of nitrogen · CPC title

• C22C19/03 Primary

  based on nickel · CPC title

• C23C8/80

  After-treatment · CPC title

• H01F1/068

  having a L10 crystallographic structure, e.g. [Co,Fe][Pt,Pd] (nano)particles · CPC title