Dry pressing isotropic ferrite preparation method

A ferrite, isotropic technology, applied in the field of preparation of dry-pressed isotropic ferrite, can solve the problems of powder sticking to the wall, poor uniformity of additives, poor product performance, etc., and achieve the effect of high remanence and simple preparation process

Inactive Publication Date: 2018-11-30
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems of poor uniformity of additives, serious powder sticking to the wall, and poor product performance in the batch preparation process of traditional dry-pressed ferrite, the present invention provides a dry-pressed isotropic ferrite with simple process, low cost and easy industrial production. The preparation method of the body, the permanent ferrite material prepared by this method can have high remanence, intrinsic coercive force and maximum magnetic energy product at the same time

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  • Dry pressing isotropic ferrite preparation method

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Experimental program
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Effect test

Embodiment 1

[0024] (1) Fine grinding of raw materials:

[0025] The raw material iron scale (purity ≥ 74.5wt%) is dried at 120 DEG C through a drying kiln, and the moisture content of the dried iron scale raw material is ≤ 1%. The dried iron scales are finely ground in a ball mill and sieved through a 60-mesh screen to obtain ground iron oxide powder with an average particle size of 5 μm;

[0026] (2) mixing:

[0027] The present embodiment batching total amount is by 800kg batching, by molecular formula SrFe 12 o 19 Weigh the main phase raw material of permanent magnet ferrite according to the molar ratio, and weigh 387.2kg of iron oxide powder (purity≥74.5wt%, average particle size of 5.5um particles), iron oxide red powder (purity≥99.3wt%, particle Average particle size 2.0um) 257.6kg, barium carbonate powder (purity ≥ 99.1wt%, particle average particle size 2.0um) 155.2kg; Add a primary additive to the main phase raw material powder, the primary additive is calcium oxide and silico...

Embodiment 2

[0035] (1) Fine grinding of raw materials:

[0036] The raw material iron scale (purity ≥ 74.5wt%) is dried at 120 DEG C through a drying kiln, and the moisture content of the dried iron scale raw material is ≤ 1%. The dried iron scales are finely ground in a ball mill and sieved through a 60-mesh screen to obtain ground iron oxide powder with an average particle size of 6 μm;

[0037] (2) mixing:

[0038] The present embodiment batching total amount is by 800kg batching, by molecular formula SrFe 12 o 19 Weigh the main phase raw material of permanent magnet ferrite according to the molar ratio, and weigh 387.2kg of iron oxide powder (purity≥74.5wt%, average particle size 5.5um of particles), iron oxide red powder (purity≥99.3wt%, particle Average particle size 2.0um) 257.6kg, barium carbonate powder (purity ≥ 99.1wt%, particle average particle size 2.0um) 155.2kg; Add a primary additive to the main phase raw material powder, the primary additive is calcium oxide and silico...

Embodiment 3

[0046] (1) Fine grinding of raw materials:

[0047] The raw material iron scale (purity ≥ 74.5wt%) is dried at 120 DEG C through a drying kiln, and the moisture content of the dried iron scale raw material is ≤ 1%. The dried iron scales are finely ground in a ball mill and sieved through a 60-mesh screen to obtain ground iron oxide powder with an average particle size of 5.5 μm;

[0048] (2) mixing:

[0049] The present embodiment batching total amount is by 800kg batching, by molecular formula SrFe 12 o 19 Weigh the main phase raw material of permanent magnet ferrite according to the molar ratio, and weigh 387.2 kg of iron oxide powder (purity ≥ 74.5wt%, particle average particle size 5.5um), iron oxide red powder (purity ≥ 99.3wt%, particle Average particle size 2.0um) 257.6kg, barium carbonate powder (purity ≥ 99.1wt%, particle average particle size 2.0um) 155.2kg; Add a primary additive to the main phase raw material powder, the primary additive is calcium oxide and sil...

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Abstract

The invention relates to the technical field of magnetic materials, particularly to a dry pressing isotropic ferrite preparation method, which comprises: (1) fine grinding of raw materials; (2) mixing: adding a primary additive to the grinded raw materials, and uniformly mixing in a powerful mixer to obtain a mixture; (3) pelletizing: carrying out pelletizing molding on the mixture and water to obtain raw ball; (4) pre-burning: making the raw ball pass through a chain fence machine, and pre-burning in a rotary kiln to obtain a pre-burning material; and (5) crushing: carrying out dry crushing on the pre-burning material to obtain the dry pressing isotropic ferrite product. According to the present invention, the method has characteristics of relatively simple preparation process and relatively low cost, and is suitable for industrial production; and the dry pressing isotropic ferrite prepared through the method can simultaneously have high remanence, high intrinsic coercive force and maximum magnetic energy product.

Description

technical field [0001] The invention relates to the technical field of magnetic materials, in particular to a preparation method of dry-pressed isotropic ferrite. Background technique [0002] Permanent magnet ferrite is also called hard ferrite. The molding process is mainly divided into two methods: dry pressing and wet pressing. Although the performance of wet pressing permanent magnets is generally higher than that of dry pressing permanent magnets, wet pressing is formed from powder The process of finished products is cumbersome, the molding pass rate is low, and the production efficiency is slow, while the dry pressing method is better than the wet pressing method, the molding rate is fast, the passing rate is high, and the cost is low, which is convenient for the production of miniaturized products. [0003] In the existing manufacturing method of dry-pressing isotropic ferrite magnetic powder, the most critical is the manufacturing process of the magnetic powder, whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/626C04B35/26
CPCC04B35/2683C04B35/62645C04B2235/3208C04B2235/3213C04B2235/3272C04B2235/3418
Inventor 杨晨
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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