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
CN105732017AActive Publication Date: 2016-07-06HUNAN AEROSPACE MAGNET & MAGNETO
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HUNAN AEROSPACE MAGNET & MAGNETO
Publication Date
2016-07-06

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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.
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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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