Process for mfg. ferrite rubber-plastic magnetic powder

A technology of rubber-plastic magnetic powder and manufacturing method, which is applied in the direction of magnetism of inorganic materials, can solve the problems of high sintering temperature, difficulty in increasing the average particle size of magnetic powder, and high tempering temperature, and achieves high performance, improved magnetic performance, and coarse particle size of magnetic powder. Effect

Active Publication Date: 2006-01-25
江门江益磁材有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, the average particle size of domestic and Japanese magnetic powder is 1.0-1.1 microns; in the prior art, after wet mixing, the sintering temperature is high, and after wet fine grinding, the particle size is 0.85-0.95 microns, and the tempering temperature is high. Finally, the particle size of the finished magnetic powder is 1.0-1.1 microns, and it is difficult to increase the average particle size of the magnetic powder.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Raw material Fe 2 o 3 (purity 98.5%, containing SiO 2 0.12%), SrCO 3 (purity 97%), the molecular formula is (SrO 0.887 BaO 0.113 )·6.0Fe 2 o 3 , 0.5 wt% CaCO 3 , using a high-speed pulverizer to mix the materials 2 times, (screen diameter 1.0 mm) after adding 6.0wt% SrCl 2 ·6H 2 O, strontium chloride is dissolved in boiling water when added, SrCl 2 ·6H 2 O: hot water=57.6 grams: 50 milliliters, after high-speed pulverization and mixing, carry out sintering after making the spherical body of diameter 8~12 millimeters, sintering temperature 1092 ℃, keep warm for 1 hour and 30 minutes. Use a high-speed pulverizer to roughly crush the sintered ball material to 1.44 microns (A.P.D), and then finely pulverize it to 1.16 microns (A.P.D) by a vibrating mill. The tempering temperature is kept at 846°C for 1 hour, and the material is dispersed by a high-speed pulverizer. . Then put the material into the mixing tank for acid treatment and water treatment; the weight r...

Embodiment 2

[0020] The sintering temperature is 1079°C, the coarse dry powder particle size is 1.4 microns (A.P.D), the finely ground particle size is 1.05 microns (A.P.D), other process conditions are the same as in Example 1, and the magnetic performance test results are: Br=2705Gs, Hc=2566Oe, Hcj=3513Oe, (BH)max=1.79MGOe, magnetic powder particle size 1.32 microns (A.P.D).

Embodiment 3

[0022] The sintering temperature is 1072°C, the coarse dry powder particle size is 1.42 microns (A.P.D), the finely ground particle size is 1.03 microns (A.P.D), other process conditions are the same as in Example 1, and the magnetic performance test results are: Br=2707Gs, Hc=2549Oe, Hcj=3355Oe, (BH)max=1.80MGOe, magnetic powder particle size 1.32 microns (A.P.D).

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Abstract

A process for preparing the magnetic ferrite powder used for rubber or plastic includes such steps as providing SrBa ferrite (SrO1-xBaOx) *nFe2O3 or Sr ferrite SrO*nFe2O3, proportionally mixing raw materials, grinding, adding assistant, pulverizing, granulating, sintering, pulverizing, tempering, water washing, baking, pulverizing and sieving.

Description

technical field [0001] The invention relates to a method for manufacturing magnetic materials, in particular to a method for manufacturing ferrite rubber-plastic magnetic powder. Background technique [0002] The performance of ferrite rubber and plastic magnetic materials mainly depends on the performance of its magnetic powder. In the process of being used for processing into magnetic devices, the magnetic powder not only has high performance requirements, but also the processing difficulty is also very important. And this machinability has a lot to do with the particle size of the magnetic powder. Often the particle size of the magnetic powder is coarse and the machinability is good. At present, the average particle size of domestic and Japanese magnetic powder is 1.0-1.1 microns; in the prior art, after wet mixing, the sintering temperature is high, and after wet fine grinding, the particle size is 0.85-0.95 microns, and the tempering temperature is high. Finally, the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26H01F1/11H01F1/36
Inventor 陈国权林毅胡婉芳罗醒沛
Owner 江门江益磁材有限公司
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