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Manufacture method of permanent magnet ferrite material powder for injection molding

A permanent magnet ferrite and injection molding technology, which is applied in the field of permanent magnet ferrite material powder manufacturing for injection molding, can solve the problem of permanent magnet ferrite magnetism, uneven magnetic force, difficulty in meeting the requirements of micro motors, long manufacturing process, etc. Problems, to achieve the effect of low manufacturing cost, ideal grain shape and high magnetic force

Inactive Publication Date: 2012-02-15
吕佳佳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the methods proposed by patent documents 1-3, etc., the inventors repeatedly tested and found that the methods proposed by patent documents 1-3 can obtain highly compressible ferrite powder, but the powder obtained by patent document 1 is due to the transition With the addition of metal oxides, it is difficult for iHc to meet the use requirements of micro motors; the performance of the powder obtained in Patent Document 2 is at a medium level, but the manufacturing process is long and the cost is high; the powder obtained in Patent Document 3 has a wide particle size distribution. Manufactured injection molded permanent ferrite magnetism, uneven magnetic force

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: Measure iron oxide and strontium carbonate according to molar ratio n=5.7, and mix, respectively add firing aid strontium chloride and densifying agent calcium carbonate according to the mixture weight ratio of 5% and 1%, and mix well. The mixed powder is fired directly in an electric furnace and kept at 1200°C for 100 minutes. The calcined product was wet ground into 3 fractions with average particle sizes of 0.7 μm, 2.2 μm and 1.3 μm, respectively. The 0.7 μm, 2.2 μm and 1.3 μm finely washed and dried products were weighed at a ratio of 20:75:5, mixed and dispersed, and then heat-treated in an electric furnace at 920° C. for 60 minutes to obtain the ferrite powder of Example 1.

[0018] The obtained ferrite powder: the average particle size is 1.4μm, and the compressed density is 3.47g / cm 3 , σs is 57.1emu / g.

Embodiment 2

[0019] Example 2: Measure iron oxide and strontium carbonate at a molar ratio of n=5.5 and mix them, add firing aid strontium chloride and compacting agent zinc oxide respectively at 5% and 1% by weight of the mixture, and mix well. The mixed powder is fired directly in an electric furnace and kept at 1180°C for 100 minutes. The fired product was wet-milled into 2 parts with average particle sizes of 0.65 μm and 2.0 μm, respectively. The 0.65 μm and 2.0 μm finely washed and dried products were weighed at a ratio of 20:80, mixed and dispersed, and then heat-treated in an electric furnace at 910° C. for 60 minutes to obtain the ferrite powder of Example 2.

[0020] The obtained ferrite powder: the average particle size is 1.3μm, and the compressed density is 3.41g / cm 3 , σs is 57.5emu / g.

Embodiment 3

[0021] Embodiment 3: Measure iron oxide and barium carbonate according to the molar ratio n=5.8, and mix them, respectively add firing aid strontium chloride and compacting agent sodium borate according to the mixture weight ratio of 4% and 1.5%, and mix them evenly. The mixed powder is fired directly in an electric furnace and kept at 1220°C for 80 minutes. The calcined product was wet-milled into 2 parts with average particle sizes of 0.8 μm and 2.3 μm, respectively. According to the ratio of 25:75, the 0.8 μm and 2.3 μm finely washed and dried products were respectively weighed, mixed and dispersed, and then heat-treated in an electric furnace at 930° C. for 60 minutes to obtain the ferrite powder of Example 3.

[0022] The obtained ferrite powder: the average particle size is 1.5μm, and the compressed density is 3.45g / cm 3 , σs is 56.8emu / g.

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Abstract

The invention discloses a manufacture method of permanent magnet ferrite material powder for injection molding, which comprises the following process steps that: firstly, raw materials consisting of iron oxide, A carbonate, compact agents and firing auxiliary agents are uniformly mixed, wherein A is one kind of materials or a mixture of two kinds of materials from Sr, Ba, Pb and Ca; then, the mixed raw materials are fired by a dry process; next, the fired materials are finely ground; and finally, the heat treatment is carried out. In the manufacture method of the permanent magnet ferrite material powder for injection molding, the compact agents are added, the molding process is not needed, dry powder is mixed for directly firing, in addition, the crushing and / or crude grinding process can be not needed, the fine powder can be obtained through direct water washing and fine grinding, the process is simple, and in addition, the permanent magnet ferrite material powder with ideal crystal particle appearance, good filling performance, strong magnetic force and uniform magnetic force can be obtained.

Description

technical field [0001] The invention relates to a method for manufacturing bonded permanent magnet ferrite powder, in particular to a method for manufacturing permanent magnet ferrite powder for injection molding. Background technique [0002] Injection molding permanent magnet ferrite is one of the four major bonded permanent magnet ferrites. It not only has the characteristics of ordinary permanent magnet materials, but also has the characteristics of high precision and easy processing of injection parts. It is widely used in micro motors and frequency converters. The field of magnetic roller, magnetic drum, audio and so on has developed rapidly since the new century, especially since the year before last, the application field has been greatly expanded, and at the same time, higher requirements are put forward for the mechanical strength, surface magnetic force and magnetic uniformity of the magnet. Permanent magnet ferrite powder for injection molding is the key basic ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/626
Inventor 吕佳佳
Owner 吕佳佳