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US 11,427,895 B2Granted
FeNi ordered alloy, FeNi ordered alloy magnet, and method for manufacturing FeNi ordered alloy
AssigneeDenso Corporation
InventorSho Goto
Life of this patent
Estimating the term…
Abstract
An FeNi ordered alloy has an L10 ordered structure, a mean order degree of 0.4 or more throughout a material, and a coercivity of 87.5 kA/m or more. For example, a nitriding treatment of an FeNi random alloy is performed and then a nitriding treatment is performed to obtain an L10-FeNi ordered alloy. A volume mean particle size of a FeNi random alloy is, for example, 45 nm or more, and a treatment temperature of the nitriding treatment is, for example, greater than or equal to 300 degrees Celsius and is less than or equal to 500 degrees Celsius, and a treatment period is, for example, 10 hours or longer.
Claims7
An FeNi ordered alloy having
- an L10 ordered structure,
- a determined mean order degree S of 0.4 or more throughout the FeNi ordered alloy, the determined mean order degree being an estimation of a mean order degree throughout the FeNi ordered alloy estimated by X-ray diffraction measurement, and
- a coercivity of 87.5 kA/m or more,
- wherein the determined mean order degree S throughout the FeNi ordered alloy is expressed as
- S
- =
- (
- I
- sup
- /
- I
- fund
- )
- obs
- (
- I
- sup
- /
- I
- fund
- )
- cal
- where
- Isup in (Isup/Ifund)obs is an integrated intensity of a superlattice diffraction peak in an X-ray diffraction pattern obtained by the X-ray diffraction measurement,
- Ifund in (Isup/Ifund)obs is an integrated intensity of a fundamental diffraction peak in the X-ray diffraction pattern obtained by the X-ray diffraction measurement,
- Isup in (Isup/Ifund)cal is an integrated intensity of a superlattice diffraction peak in a simulation result of an X-ray diffraction pattern of an L10-FeNi ordered alloy having the mean order degree of 1 throughout the L10-FeNi ordered alloy, and
- Ifund in (Isup/Ifund)cal is an integrated intensity of a fundamental diffraction peak in the simulation result of the X-ray diffraction pattern of the L10-FeNi ordered alloy having the mean order degree of 1 throughout the L10-FeNi ordered alloy;
- wherein the L10 ordered structure has the superlattice diffraction peak from a (001) plane;
- and
- wherein the superlattice diffraction peak is based on a 28 degree peak in the X-ray diffraction measurement with a kβ X-ray of Fe.
27 more elements
Dependencies are inferred from the claim text.