High-remanence low-coercivity permanent magnetic material and preparation method thereof

A low coercivity, permanent magnet material technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problem of high coercivity of permanent magnet materials

Inactive Publication Date: 2012-11-07
LUOHE SANXIN RARE EARTH PERMANENT MAGNETIC MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the coercive force of the permanent magnetic material prepared by the above method is still relatively high, so the development of high remanence low coercive force material and its preparation method has always been a problem that those skilled in the art are committed to researching and solving.

Method used

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  • High-remanence low-coercivity permanent magnetic material and preparation method thereof
  • High-remanence low-coercivity permanent magnetic material and preparation method thereof
  • High-remanence low-coercivity permanent magnetic material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1-3

[0020] Take pure Nd, pure Fe, B-Fe (wherein the atomic percentage of B is 19%), Cu, Al and Si according to the following proportions:

[0021] 1. 4.2at% Nd 73.4at% Fe 18.7at% B 0.8at% Cu 1.5at% Al 1.4at% Si;

[0022] 2. 4.2at% Nd 74at% Fe 18.7at% B 0.6at% Cu 1.3at% Al 1.2at% Si;

[0023] 3. 4.2at% Nd 74.6at% Fe 18.7at% B 0.4at% Cu 1.1at% Al 1.0at% Si;

[0024] The induction melting furnace is used for melting, and the melting vacuum is 5×10 -2 Pa, and filled with Ar gas to a vacuum of 0.06Mpa in the furnace as a protective gas to prevent oxidation of the alloy ingot. After smelting, it is poured on a pouring mold with cold water, and the pouring time is controlled at 2-3 minutes, wherein the embodiment 1 and 2 are 2.5 minutes, and the embodiment 3 is 3 minutes. After cooling for 1 hour, it will be released normally. At this time, the main phase structure in the alloy ingot is Nd 2 Fe 14 B phase, α-Fe phase and Fe 3 Phase B, due to the control of the addition of Cu, Al, S...

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Abstract

The invention belongs to the field of magnetic materials, and in particular relates to a high-remanence low-coercivity permanent magnetic material and a preparation method thereof. The material has the atomic components shown as RxFe100-x-y-a-b-cAlaCubSicBy, wherein x is 4 to 4.5; y is 18 to 19.5; a is not zero and is no more than 1.5; b is not zero and is no more than 0.8; c is not zero and no more than 1.4; R is rare-earth element; and Fe, Al, Cu, Si and B respectively refer to iron, aluminum, copper, silicon, boron elements. The material consists of ultra-fine crystals of which the main phase is a mixture of three metal phases, namely R2Fe14B, Fe3B and alpha-Fe, wherein iron atoms are substituted by Al, Cu and Si atoms compositely. The permanent magnetic material prepared by the invention has more outstanding characteristics of high remanence and low coercivity.

Description

(1) Technical field [0001] The invention belongs to the field of magnetic materials, in particular to a permanent magnet material with high remanence and low coercive force and a preparation method thereof. (2) Background technology [0002] Magnetic powder has a high degree of freedom and can be made into any shape, so it is widely used in the manufacture of special-shaped and special-shaped bonded magnets. [0003] In the metal iron melt with low rare earth and high boron, it contains a large amount of α-Fe phase and Fe 3 Phase B and Product R 2 Fe 14 Phase B, due to the α-Fe phase and the Fe 3 The existence of a large number of B phases greatly strengthens the metal bond and covalent bond, and shows strong hardness to the outside, so it becomes very difficult to break the alloy ingot by traditional physics. In addition, the formula of the traditional preparation process tends to produce magnetic powder with high coercive force and high magnetic energy accumulation. Ho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/147B22F9/04C22C1/05
Inventor 张财政张卫华张振江张晓枫赵二伟
Owner LUOHE SANXIN RARE EARTH PERMANENT MAGNETIC MATERIAL
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