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High-performance permanent magnet ferrite material with secondary pre-sintering of powder and preparation method thereof

A technology of permanent magnet ferrite and secondary pre-burning, which is applied in the direction of magnetic materials, magnetic objects, electrical components, etc., and can solve problems such as high cost

Active Publication Date: 2021-03-26
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high-performance permanent magnet ferrite material for secondary pre-calcination of the material powder is optimized through formula and process, and the pre-calcined material is pre-calcined for the second time to make it fully react and reduce costs. On the basis of ensuring that the material performance is basically unchanged, Reduce the cost of Co element by more than 10% year-on-year, effectively solving the problem of high cost of medium and high-grade permanent magnet ferrite materials due to the addition of more rare earth elements

Method used

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  • High-performance permanent magnet ferrite material with secondary pre-sintering of powder and preparation method thereof
  • High-performance permanent magnet ferrite material with secondary pre-sintering of powder and preparation method thereof
  • High-performance permanent magnet ferrite material with secondary pre-sintering of powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Extended pre-burning heat preservation and secondary pre-burning test

[0035] Weigh Fe 2 o 3 Powder 485.3g, SrCO 3 Powder 34.65g, La 2 o 3 Powder 33.07g, CaCO 3 Powder 13.11g, Co 2 o 3 Powder 10.24g. Put the above-mentioned weighed raw materials into the ball mill tank, add the sintering aid SiO 2 Add 0.57g of powder, add 840ml of water, mix and stir for 5 hours, the average particle size of each raw material before mixing is not more than 2.0μm, and the average particle size of the slurry particles after mixing is not more than 0.8μm. Put the slurry into the oven to dry

[0036]The pre-fired material is made by controlling the pre-fired heat preservation time and the difference in the number of pre-fired times.

[0037] Add 0.2wt% organic dispersant calcium gluconate to the sample block after calcining, then carry out coarse pulverization to calcined material and the dry coarse pulverization of additive for 5 minutes in continuous dry type vibratory ball mil...

Embodiment 2

[0045] Addition of Co content in ball milling after secondary calcining

[0046] Weigh Fe 2 o 3 Powder 485.3g, SrCO 3 Powder 34.65g, La 2 o 3 Powder 33.07g, CaCO 3 Powder 13.11g, Co 2 o 3 Powder 10.24g. Put the above-mentioned weighed raw materials into the ball mill tank, add the sintering aid SiO 2 Add 0.57g of powder, add 840ml of water, mix and stir for 5 hours, the average particle size of each raw material before mixing is not more than 2.0μm, and the average particle size of the slurry particles after mixing is not more than 0.8μm. After the slurry is dried, it is pressed into blocks, and pre-sintered in the air. The sintering temperature is 1200 ° C, and the holding time is 1 hour; 0.2wt% organic dispersant calcium gluconate is added to the pre-fired sample block, and then In the continuous dry vibrating ball mill, the calcined material is coarsely crushed and the additives are dry-type coarsely crushed for 5 minutes. The average particle size of the crushed p...

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Abstract

The invention belongs to the technical field of sintered permanent magnetic ferrite materials, and discloses a high-performance permanent magnetic ferrite material obtained through powder material secondary presintering and a preparation method thereof. The composition of the high-performance permanent magnetic ferrite material obtained through powder material secondary presintering is A<1-x>R<x>(Fe<12-y>M<y>)<z>O<19>, wherein A represents two or more elements of Sr, Ba and Ca, and must contain Sr and Ca; R is at least one element selected from a group consisting of rare earth elements and Bi,and contains at least La; M is at least one element selected from the group consisting of Co, Mn, Mg, Ni, Cu and Zn, and contains at least Co; x, y and z represent molar ratios, x ranges from 0.1 to0.3, y ranges from 0.2 to 0.5; and z ranges from 0.9 to 1.1. According to the invention, through formula and process optimization, a pre-sintered material is subjected to secondary pre-sintering, so that the pre-sintered material is fully reacted, and the Co element cost is reduced by more than 10% on the basis of ensuring that the material performance is basically unchanged.

Description

technical field [0001] The invention relates to the technical field of sintered permanent magnet ferrite materials, in particular to a high-performance permanent magnet ferrite material with secondary calcining of material powder and a preparation method thereof. Background technique [0002] Sintered permanent magnet ferrite has stable magnetic properties, strong demagnetization resistance, is not easy to rust, does not need to be coated with a protective layer, is hard and brittle, can be used for special tool processing, cutting, etc., and is low in price and low in use cost, so it is widely used Used in automobiles, household appliances, industrial automation and other industries. [0003] The conventional ferrite sintering process generally undergoes two sinterings. Through the first pre-sintering, a solid phase reaction occurs between the raw material particles, so that most of the raw materials become ferrite. At the same time, the volume of the material shrinks signi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/40C04B35/36C04B35/38C04B35/32C04B35/34C04B35/28C04B35/30H01F1/057
CPCC04B35/2625C04B35/2633C04B35/2641C04B35/265C04B2235/3275C04B2235/3418C04B2235/442C04B2235/48H01F1/0577
Inventor 申屠金昂杨武国吴赛航翁凤华方盛翔何震宇
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD