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Application of alloy powder, hard magnetic material and its preparation method and application

A technology of alloy powder and hard magnetic material, applied in the field of alloy powder, can solve the problems of expensive supply of Ge element, quaternary alloy does not show coercive force or remanence, disappearance of uniaxial anisotropy, etc.

Active Publication Date: 2022-01-25
INNER MONGOLIA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The only known examples are (Fe,Mn) 2 (P,Ge) compound, but compared with the present invention, this compound is not preferred, because the Ge element is expensive and limited in supply, and in most cases simultaneous substitution will lead to the disappearance of uniaxial anisotropy, which is not conducive to the formation of hard magnetic materials (J.V.Leitao, et al., J.Magn.Magn.Mater.344(2013)49)
In addition, Fe-Ni-P-Si quaternary alloys do not show coercivity or remanence, and do not form hard magnetic materials (J.Y.Xu, et al., Structure and magnetic properties of Fe 1.95-x Ni x P 1-y Si y alloys, Solid State Communications 319(2020))

Method used

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  • Application of alloy powder, hard magnetic material and its preparation method and application
  • Application of alloy powder, hard magnetic material and its preparation method and application
  • Application of alloy powder, hard magnetic material and its preparation method and application

Examples

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preparation example Construction

[0076]

[0077] The preparation method of the hard magnetic material of the present invention comprises the following steps: pressing the alloy powder in a magnetic field to obtain the hard magnetic material. The particle size of the alloy powder is less than or equal to 5 μm, and has a composition as shown in formula (1):

[0078] Fe u-y co y P 1-x Si x (1);

[0079] Wherein, 1.90≤u≤2.00, 0

[0080] According to one embodiment of the present invention, the alloy powder is bonded and formed by using a binder. The adhesive may be an epoxy adhesive. The mass ratio of the binder to the alloy powder may be 1:20-1:2; preferably 1:15-1:3; more preferably 1:10-1:4.

[0081] In the present invention, the external magnetic field μ 0 H may be greater than 0.5T; preferably, greater than 0.8T; more preferably, greater than or equal to 1.1T.

[0082] The preparation method of the present invent...

preparation example 1～4

[0114] (1) According to the composition of alloy powder Fe 1.75 co 0.20 P 0.75 Si 0.25 The raw materials were weighed, and the raw materials were dry-milled in a planetary ball mill for 10 hours to obtain fine powder. Among them, the mass ratio of steel balls to raw materials in the planetary ball mill is 5:1. The fine powder is pressed into a cylindrical green body, the green body is sintered under the protection of argon, and then quenched to room temperature to obtain an alloy blank. Among them, the sintering temperature is 1370K, and the sintering time is 10h.

[0115] (2) The alloy blank is wet ball milled in a planetary ball mill with heptane as a solvent and oleic acid as a surfactant to obtain an alloy powder. Wherein, the amount of solvent used is 80wt% of the weight of the alloy blank, the amount of oleic acid used is 30wt% of the weight of the alloy blank, and the mass ratio of the steel ball to the alloy blank in the planetary ball mill is 5:1. The ball milli...

preparation example 5～8

[0119] Except step (2), all the other are with preparation example 1, details are as follows:

[0120] (1) According to the composition of alloy powder Fe 1.75 co 0.20 P 0.75 Si 0.25 The raw materials were weighed, and the raw materials were dry-milled in a planetary ball mill for 10 hours to obtain fine powder. Among them, the mass ratio of steel balls to raw materials in the planetary ball mill is 5:1. The fine powder is pressed into a cylindrical green body, the green body is sintered under the protection of argon, and then quenched to room temperature to obtain an alloy blank. Among them, the sintering temperature is 1370K, and the sintering time is 10h.

[0121] (2) Dry ball milling the alloy blank in a planetary ball mill under the protection of argon to obtain alloy powder. The mass ratio of steel balls to alloy blanks in the planetary ball mill is 5:1. The ball milling time and the particle size of the alloy powder are shown in Table 2.

[0122] Table 2

[012...

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Abstract

The invention discloses the use of alloy powder. The alloy powder can be used to prepare hard magnetic materials, and the particle size of the alloy powder is less than or equal to 5 μm, and has a composition as shown in formula (1): Fe u‑ y co y P 1‑x Si x (1); wherein, 1.90≤u≤2.00, 0<y<1, 0<x≤0.6. The invention also discloses a hard magnetic material and its preparation method and application.

Description

technical field [0001] The invention relates to the use of an alloy powder, and also relates to a hard magnetic material and a preparation method and use thereof. Background technique [0002] Hard magnetic materials have a wide range of applications and have become an indispensable part in daily life, industry and military fields. The 2016 international standard IEC 60404-1 recommends a coercive force field of 1kA / m for distinguishing soft and hard magnetic materials. Hard magnetic materials can even be subdivided into semi-hard (coercivity between 1 and 50kA / m) and hard magnetic materials. Materials considered to have semi-hard or hard magnetic potential could be used in applications involving permanent magnets and / or other magnetism, such as data storage. Hard magnetic materials require the following properties: i) Large coercivity, remanence and energy product |BH| Max ; ii) high magnetic transition temperature; iii) large saturation magnetization; iv) large magnetocr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/10B22F1/05B22F1/054B22F3/02B22F3/10B22F3/24B22F9/04H01F1/047H01F41/02
CPCC22C38/02C22C38/10C22C38/002B22F9/04B22F3/02B22F3/10B22F3/24H01F1/047H01F41/02B22F2009/043B22F2003/248B22F2998/00B22F2202/05
Inventor 弗朗斯瓦·吉尤伊博乐包玲玲
Owner INNER MONGOLIA NORMAL UNIVERSITY