Additive and method for improving performance of permanent magnetic ferrite

A permanent magnet ferrite and additive technology, which is applied in the field of additives to improve the magnetic properties of permanent magnet ferrite, can solve the problems of increasing material cost pressure, high price of cobalt oxide, and influence on pass rate, etc., and achieves low cost, excellent magnetic properties, The effect of improving the magnetic performance

Active Publication Date: 2016-07-06
HUNAN AEROSPACE MAGNET & MAGNETO
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Problems solved by technology

[0005] At present, when producing high-performance permanent magnet ferrite, many enterprises adopt the method of adding calcium carbonate, quartz sand, lanthanum oxide and cobalt oxide to improve the performance of the magnet. However, due to the high price of cobalt oxide, it greatly increases the cost of materials Therefore, all companies are looking for cheaper and more effective additives to replace cobalt oxide
[0006] CN104446519A discloses a dispersant and method for improving the magnetic performance of permanent magnet ferrite. It adopts the method of adding dispersant to realize the improvement of magnetic performance. Although the experimental effect close to the present invention can be obtained by using dispersant, due to the added The dispersant will expand and decompose in the initial sintering stage of the product (below 300°C), which will cause the blank to crack. Therefore, the addition of dispersant will have a certain impact on the qualified rate of the product

Method used

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  • Additive and method for improving performance of permanent magnetic ferrite
  • Additive and method for improving performance of permanent magnetic ferrite
  • Additive and method for improving performance of permanent magnetic ferrite

Examples

Experimental program
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Effect test

Embodiment 1～6

[0027] The additives for improving the magnetic performance of permanent magnet ferrite in Examples 1-6 are composed of calcium carbonate, quartz sand and silicon carbide. The specific mass ratio is shown in the 2nd to 4th rows of Table 1, and they are respectively numbered 1# to 6# , wherein, the silicon carbide in 1#, 2#, and 5# additives was stirred and cleaned for 4 hours in an ammonia solution with a pH value of 10, and the silicon carbide in 3# and 4# additives was cleaned in a sodium hydroxide solution with a pH value of 14 Stir and wash for 6 hours, and the silicon carbide in the 6# additive is not washed with alkaline solution.

[0028] The method for improving the magnetic properties of permanent ferrite by applying the 1#~6# additives comprises the following steps:

[0029] (1) Add 6 parts (1 kg each) of permanent magnet ferrite calcined materials to the ball mill respectively, then add the 1#~6# additives respectively, and then add water to the ball mill (see Table...

Embodiment 4

[0042] Example 4 obtained the best magnetic properties, with Br as high as 415.2mT, Hcb as high as 301.5kA / m, and Hcj as high as 311.2kA / m. It shows that the treatment of silicon carbide with alkaline solution can increase the surface area of ​​silicon carbide, improve the reactivity of silicon carbide, make it easier to react with calcium carbonate to form silicate substances, improve the microstructure of the magnet, and coordinate the amount of water added, Reasonable selection of parameters such as ball mill particle size, magnetic field strength, and sintering temperature further greatly improves the magnetic properties of permanent ferrite materials.

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Abstract

The invention discloses an additive and method for improving the performance of permanent magnetic ferrite. The additive is composed of calcium carbonate, quartz sand, and silicon carbide. The method comprises the following steps: (1) adding a permanent magnetic ferrite pre-sintered material into a ball mill, at the same time, adding the additive, then adding water, and carrying out ball-milling to obtain permanent magnetic ferrite slurry; (2) filtering the permanent magnetic ferrite slurry to obtain permanent magnetic ferrite filtered slurry; (3) filling the permanent magnetic ferrite filtered slurry into a mould, and pressing the permanent magnetic ferrite filtered slurry under a pressure of 350 to 500 kg/cm2 and a magnetic field strength of 450 to 950 kA/m so as to obtain a permanent magnetic ferrite blank; (4) sintering the obtained permanent magnetic ferrite blank for 0.5 to 3.0 hours at a temperature of 1150 to 1250 DEG C to obtain permanent magnetic ferrite. The additive cost is low, the raw material resources are wide, pricy additives such as rare earth elements, cobalt oxide, and the like are not needed; compared with the prior art, the magnetic performance of the obtained permanent magnetic ferrite is more excellent, and the performance to cost ratio is higher.

Description

technical field [0001] The invention specifically relates to an additive and a method for improving the magnetic properties of permanent ferrite. Background technique [0002] Permanent ferrite is a non-metallic magnetic material, which can generate a stable magnetic field only by providing magnetization energy once from the outside, so as to continuously provide magnetic energy to the outside. Permanent magnet ferrite is mainly used in various motor equipment and speakers, etc. At present, the widely used permanent magnet ferrite materials use iron oxide and strontium carbonate as raw materials, and high-performance permanent magnet ferrite materials also need to add cobalt oxide And rare earth oxides to improve magnetic properties. [0003] The magnetic performance indicators of permanent ferrite mainly include remanence (Br) and intrinsic coercive force (Hcj). The higher the two indicators, the better the performance of the magnet, and the remanence is proportional to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26
CPCC04B35/26C04B2235/3208C04B2235/3418C04B2235/3826C04B2235/5445C04B2235/605
Inventor 郑亮张铁军邱捧祥
Owner HUNAN AEROSPACE MAGNET & MAGNETO
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