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Preparing method of rare earth iron-boron-based anisotropy magnetic powder and prepared magnetic powder

An anisotropic magnetism, rare earth iron boron technology, applied in the field of preparation methods and prepared magnetic powders, can solve the problem of the reduction of magnetic powder remanence and maximum magnetic energy product technical indicators, the reduction of magnetic powder remanence and maximum magnetic energy product, and the increase of the cost of making magnetic powder. and other problems, to achieve the effect of good popularization and application value, uniform coercivity and high coercivity

Active Publication Date: 2015-05-20
BEIKUANG MAGNETS FUYANG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this method has at least the following two disadvantages: one is to increase the process and reduce the production efficiency; the other is to use a certain amount of dysprosium element, which increases the cost of making magnetic powder
However, this method has at least the following two disadvantages: one is that the process is increased and the production efficiency is reduced; the other is that due to the addition of a certain amount of non-magnetic elements Cu and Al, important technical indicators such as remanence and maximum magnetic energy product of the magnetic powder significantly decreased
However, because the magnetic powder prepared by this method is rich in non-magnetic Al elements, important technical indicators such as remanence and maximum magnetic energy product of the magnetic powder are significantly reduced, which greatly affects the popularization and application of the magnetic powder.

Method used

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  • Preparing method of rare earth iron-boron-based anisotropy magnetic powder and prepared magnetic powder
  • Preparing method of rare earth iron-boron-based anisotropy magnetic powder and prepared magnetic powder
  • Preparing method of rare earth iron-boron-based anisotropy magnetic powder and prepared magnetic powder

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preparation example Construction

[0034] A method for preparing anisotropic rare earth iron-boron magnetic powder, comprising the following steps:

[0035] Step a: the step of preparing rare earth iron boron alloy particles.

[0036]Specifically: the step of preparing rare earth iron boron alloy particles may include:

[0037] (1) Step a1, according to the general chemical formula R of rare earth iron boron magnetic powder x T 1-x-y-z B y m z Batching is carried out and made into rare earth iron boron alloy ingot or rare earth iron boron alloy quick-setting sheet.

[0038] In the general chemical formula, R is at least one of neodymium (Nd), praseodymium (Pr), lanthanum (La), cerium (Ce), dysprosium (Dy) or terbium (Tb); T is iron (Fe), cobalt At least one of (Co) or nickel (Ni); M is gallium (Ga), niobium (Nb), zirconium (Zr), copper (Cu), aluminum (Al), vanadium (V), titanium (Ti) , at least one of molybdenum (Mo), silicon (Si) or manganese (Mn); B is boron. x, y, and z respectively represent the weig...

Embodiment 1～12

[0069] Dosing according to the magnetic powder composition ratio scheme in Table 1 below, and complete 12 specific examples of the present invention according to the preparation method of the rare earth iron-boron anisotropic magnetic powder described in the above technical solution of the present invention, thereby obtaining 12 kinds of Rare-earth iron-boron anisotropic magnetic powder with high coercivity, and the vibrating sample magnetometer (VSM) in the prior art is used to measure the intrinsic coercive force iHc and remanence of each rare-earth iron-boron anisotropic magnetic powder Br and maximum magnetic energy product (BH) max these performance indicators are measured, and the measurement results can be shown in Table 3 below. Wherein, embodiment 2 of the present invention performs the step of "complete dehydrogenation stage" when performing the first HDDR treatment, while the remaining embodiments of the present invention do not perform the step of "complete dehydrog...

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Abstract

The invention discloses a preparing method of rare earth iron-boron-based anisotropy magnetic powder and the prepared magnetic powder. The method comprises the steps that rare earth iron-boron alloy particles are subjected to HDDR processing, the rare earth iron-boron alloy particles obtained after HDDR processing is subjected to HDDR processing again, and accordingly the high-coercivity rare earth iron-boron-based anisotropy magnetic powder is obtained. The coercivity of the rare earth iron-boron-based anisotropy magnetic powder can be greatly improved, magnetic powder cost cannot be increased, and the residual magnetism and the maximum magnetic energy product of the magnetic powder cannot be lowered greatly.

Description

technical field [0001] The invention relates to the field of magnetic materials, in particular to a method for preparing anisotropic rare earth iron-boron magnetic powder and the prepared magnetic powder. Background technique [0002] At present, there are three main methods to improve the coercive force of rare earth iron-boron anisotropic magnetic powder: [0003] The first one, in the Chinese patent with the notification number CN1198291C, Japan Aichi Steel Co., Ltd. is using HDDR (hydrogenation-disproperation-desorption-recombination, hydrogen absorption-disproportionation-dehydrogenation-recombination) process to process RFeBH x In the powder process, a small amount of diffusion powder mainly composed of dysprosium (or dysprosium alloy) hydrogen compound is added. After thorough mixing, the grain boundary diffusion heat treatment and subsequent dehydrogenation process are carried out, so that high coercive force and high Anisotropic magnetic powder; the magnetic powder...

Claims

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Application Information

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IPC IPC(8): B22F9/04H01F1/057H01F1/06
Inventor 刘冬李野高俊彦王倩刘荣明滕阳民
Owner BEIKUANG MAGNETS FUYANG CO LTD
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