Prepn. of ferrite permanent-magnet materials

A ferrite permanent magnet and magnetic material technology, applied in the direction of the magnetism of inorganic materials, can solve the problems of ferrous ion formation, lower resistivity, increased cost, etc., to optimize magnetic properties, improve orientation, and achieve low-temperature sintering Effect

Inactive Publication Date: 2006-09-20
刘仁臣
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Problems solved by technology

However, the main problem of this method is that the process is complicated, and it is easy to cause the formation of ferrous ions after high temper

Method used

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Embodiment Construction

[0010] The main process of the preparation method of the ferrite permanent magnet material of the present invention is basically the same as that of the current dry molding method for preparing magnetic materials, and also includes: adding and mixing a binder into the raw material powder of the iron oxide magnetic material Adding process; adjusting moisture in the molding mixture containing the above-mentioned raw material powder and binder; adding the above-mentioned molding mixture with adjusted moisture into a mold, and applying a magnetic field to arrange the oxide magnetic powder in the direction of easy magnetization Simultaneously pressurized dry molding process in a magnetic field; and firing process of firing the formed molded body under high temperature conditions.

[0011] The magnetic material of the oxide is selected from one or more mixtures of iron oxide and manganese-zinc ferrite, manganese ferrite, magnesium ferrite, copper-zinc ferrite, and in the above magnet...

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Abstract

This invention relates to a method to prepare permanent ferromagnetic materials. It includes following steps: addition of adhesives into ferro oxide magnetic materials; moisture adjustment; molding, magnetization and compression of moisture-adjusted mixture and sintering at high temperatures. The characteristics is that, the ferro oxide magnetic materials are chosen from one of several species of ferro oxide, manganese-zincum ferrite, manganese ferrite, magnesium ferrite and copper-zincum ferrite, and metal nitrite weighing 1~2wt% of the total magnetic materials mentioned above is also added. The adhesives include thermoplastic resin containing keto-groups and weigh 0.1~0.2wt% of the total mixture. The moisture content in the mixture during moisture adjustment is 0.2~0.4wt%. Finally, the sintering is carried out at a temperature between 350~450 deg. C. This invention has the outstanding specificity that low-temperature sintering can be realized by modification of raw materials and adhesives and thus cost is cut down; orientation can be enhanced and magnetic properties can be optimized.

Description

technical field [0001] The invention relates to a preparation method of a ferrite permanent magnet material, in particular to a preparation method of an oxide magnetic material system permanent magnet formed by a dry molding method. Background technique [0002] At present, the manufacturing methods of permanent magnets are roughly divided into dry forming methods and wet forming methods. In the wet forming method, (such as Chinese Patent No. 03116206.1), since the permanent magnet pellets are easy to rotate in the dispersion medium, the magnetic material can obtain good orientation, thereby obtaining good magnetism. However, since the dispersion medium must be discharged out of the molding space (outside the mold cavity) during press molding, the productivity will be reduced; in addition, a large mold structure is required, which increases the cost of equipment. The dry molding method is to fill the dry state of the permanent magnet material powder into the molding space (...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622C04B35/634H01F1/01
Inventor 刘仁臣丰茂忠
Owner 刘仁臣
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