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Method for preparing lanthanum-free and cobalt-free calcium permanent magnet ferrite materials

A permanent magnet ferrite and main component technology, applied in the field of permanent magnet ferrite material preparation, can solve problems such as difficulty in ion co-precipitation, high pre-burning temperature, etc., and achieve industrial production, controllable process conditions, and reaction temperature low effect

Active Publication Date: 2014-08-27
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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Problems solved by technology

Disadvantages are: wide range of particle size distribution, uneven particle shape, high pre-calcination temperature
The disadvantages are: the decomposed gas is corrosive, pollutes the environment, and requires high experimental conditions
The disadvantages are: when the formula is designed for doping with rare earth ions, the co-precipitation of ions is difficult and the uniformity is poor, and the prepared particles are easier to agglomerate
The disadvantages are: raw material purity and equipment requirements are high, and the hydrothermal reaction is uncontrollable, and it is easy to generate impurity phases
Disadvantages are: high cost, easy to crack samples
The second micro-grinding pulverizes the heat-treated powder to below 0.8 μm, more preferably 0.1-0.2 μm. Such a fine powder is very difficult in the magnetic field forming process, and the forming efficiency is greatly reduced. In addition, the patent embodiment is Obtain the properties of Br4510Gs and Hcj 5585 Oe, the replacement amount of Co reaches 0.4, and the production cost is high
In Example 3, Nd with a molar ratio of 0.41 and La with a molar ratio of 0.23 are used for the D position substitution, and Gd with a molar ratio of 0.38 and Co with a molar ratio of 0.26 are used for Ln. The magnetic properties are Br=0.47T, Hcj=430kA / m, and the maximum magnetic energy Product (BH)max=43.3 kJ / m 3 performance, but extensive use of expensive Nd 2 o 3 and Gd 2 o 3 , greatly increased the production cost and lost the cost-effective characteristics of M-type permanent magnet ferrite

Method used

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  • Method for preparing lanthanum-free and cobalt-free calcium permanent magnet ferrite materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1: The main component raw material is pressed (1-x-y) AO · xBaO · Bi 2 o 3 ·(n-z-w)Fe 2 o 3 ·2zZnO·2wMnO composition formula, A is Ca. Among them, x=0.21, y=0.03, z=0.2, w=0.005, n=5.4 weigh the weight (the main component raw material is: Fe 2 o 3 , Bi 2 o 3 , Mn 2 o 3 , BaCO 3 , CaCO 3 , ZnO), and then weigh the molten salt: Na 2 SO 4 +K 2 SO 4 +Li 2 SO 4 (Respective molar percentages: 29.5%, 30%, 40.5%). The weight of the molten salt is 10% based on the total weight of the main components and each raw material. Put them together in a ball mill for wet ball milling. The ball milling time is 7 hours (average particle size 0.6-1μm), After the obtained mixture was dried, it was kept at 500°C for 2 hours under atmospheric conditions, then the temperature was raised to 920°C at 3°C / min, and the heat was kept for 3 hours. The particle size D50 is 2.8 μm. Then weigh the pre-fired powder and transfer it to the sedimentation tank. After washing the...

Embodiment 2

[0042] Example 2 The amount of molten salt is 15% of the total weight of each raw material as the main component, and the rest are the same as in Example 1.

Embodiment 3

[0043] The amount of molten salt in embodiment 3 is mainly composed of 20% of the total weight of each raw material, and the rest are the same as in embodiment 1.

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Abstract

The present invention discloses a method for preparing lanthanum-free and cobalt-free calcium permanent magnet ferrite materials. The invention uses molten salts as solid-phase reaction medium, by adjusting the types and the ratio of the molten salts and controlling the sintering process, the lanthanum-free and cobalt-free calcium permanent magnet ferrite materials with higher magnetic performance compared with traditional process is produced under a condition without adding lanthanum and cobalt. The method has characteristics of low material costs and high comprehensive performance. According to the present invention, the method has advantages of low reaction temperature and low power consumption.

Description

technical field [0001] The invention relates to a preparation method of a permanent magnet ferrite material, in particular to a preparation method of a lanthanum-cobalt-free permanent magnet ferrite. Background technique [0002] Ferrite is a composite oxide composed of iron group elements and one or several other appropriate metal elements. The magnetoplumbite type ferrite with hexagonal crystal system is a kind of permanent magnet ferrite. Anisotropy, Curie temperature, excellent chemical stability and other characteristics make it widely used in various electrical equipment motors, household appliance motors, automobile electric lift motors, wiper motors and other auto parts motors, medical equipment Driving motors, office supplies motors and other fields. [0003] There are mainly the following methods for preparing ferrite materials: [0004] (1) The ceramic method is also called the oxidation method. It is mainly prepared by mixing powdery raw materials according to...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622
Inventor 李军华金志洪吴云飞杨武国李玉平
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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