Permanent magnetic ferrite material and preparation method thereof

A permanent magnet ferrite and raw material technology, applied in the field of ferrite, can solve problems such as limited reserves, rising cost of permanent magnet ferrite, difficult magnetic properties, etc., and achieve the effect of improving magnetic properties

Active Publication Date: 2019-01-04
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the rapid increase in the price of Co resources in the past two years, the cost of permanent magnet ferrites has also increased, and Co resources, as a scarce element, have limited reserves, so it is necessary to develop other low-cost ions to replace permanent magnet ferrites.
[0004] At present, the permanent magnet ferrite material containing

Method used

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  • Permanent magnetic ferrite material and preparation method thereof
  • Permanent magnetic ferrite material and preparation method thereof
  • Permanent magnetic ferrite material and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0031] A kind of permanent magnet ferrite material, its chemical formula is SrFe 11.9 Y 0.1 o 19 , the raw material is SrCO 3 Powder, CaCO 3 Powder, Fe 2 o 3 Powder, Y 2 o 3 For powder and ZnO powder, the average particle size of each raw material is required to be below 5 μm.

[0032] A preparation method of a permanent magnet ferrite material, comprising the following steps:

[0033] a) Batching: Prepare the raw materials according to the above stoichiometric ratio and mix them evenly;

[0034] b) One-time ball milling: put the uniformly mixed raw materials into the ball milling tank and mill for 3 hours and dry at a speed of 65-75rpm; the weight ratio of raw materials, balls and water during ball milling is 1:13:1.4;

[0035] c) Pre-sintering: pre-sintering the raw materials treated above at 1100°C to obtain pre-sintered material, and the pre-sintering time is 2.5 hours;

[0036] d) Secondary ball milling: crush the calcined material into 4 μm particles, then add ...

Embodiment 2

[0041] A kind of permanent magnet ferrite material, its chemical formula is Sr 0.8 Ca 0.2 Fe 11.7 Y 0.2 Zn 0.1 o 19 , the raw material is SrCO 3 Powder, CaCO 3 Powder, Fe 2 o 3 Powder, Y 2 o 3 For powder and ZnO powder, the average particle size of each raw material is required to be below 5 μm.

[0042] A preparation method of a permanent magnet ferrite material, comprising the following steps:

[0043] a) Batching: Prepare the raw materials according to the above stoichiometric ratio and mix them evenly;

[0044] b) One-time ball milling: put the uniformly mixed raw materials into a ball mill tank and mill for 6 hours and dry at a speed of 75 rpm; the weight ratio of raw materials, balls and water during ball milling is 1:15:1.6;

[0045] c) Pre-sintering: pre-sintering the raw materials treated above at 1350°C to obtain pre-sintered material, and the pre-sintering time is 4 hours;

[0046] d) Secondary ball milling: crush the calcined material into 6 μm particl...

Embodiment 3

[0051] A kind of permanent magnet ferrite material, its chemical formula is Sr 0.9 Ca 0.1 Fe 11.8 Y 0.1 Zn 0.1 o 19 , the raw material is SrCO 3Powder, CaCO 3 Powder, Fe 2 o 3 Powder, Y 2 o 3 For powder and ZnO powder, the average particle size of each raw material is required to be below 5 μm.

[0052] A preparation method of a permanent magnet ferrite material, comprising the following steps:

[0053] a) Batching: Prepare the raw materials according to the above stoichiometric ratio and mix them evenly;

[0054] b) One-time ball milling: Put the uniformly mixed raw materials into the ball milling tank and mill for 3-6 hours and dry at a speed of 65-75rpm; the weight ratio of raw materials, balls and water during ball milling is 1:14:1.5;

[0055] c) Pre-sintering: pre-sintering the raw materials treated above at 1200°C to obtain pre-sintered material, and the pre-sintering time is 3 hours;

[0056] d) Secondary ball milling: crush the calcined material into 4-6μ...

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Abstract

The invention belongs to the technical field of ferrites, and discloses a permanent magnetic ferrite material. The chemical formula of the permanent magnetic ferrite material is Sr1-xCaxFe12-y-zYyZnzO19, wherein 0<=x<=0.2, 0.1<=y<=0.2, and 0<=z<=0.1. The invention further discloses a preparation method of the permanent magnetic ferrite material. The preparation method includes the steps of batching, primary ball milling, presintering, secondary ball milling, forming, sintering, post-treatment and the like. Calcium oxide, yttrium oxide and zinc oxide are jointly added to an existing strontium ferrite, ionic replacement effects are achieved, and the magnetic performance of the permanent magnetic ferrite without Co is improved.

Description

technical field [0001] The invention relates to the technical field of ferrite, in particular to a permanent magnet ferrite material and a preparation method thereof. Background technique [0002] M-type permanent ferrite is a ferrimagnetic oxide with good magnetic properties and outstanding cost performance. It is widely used in home appliance motors, sensors, office equipment, automotive motors, medical equipment and other fields. [0003] In recent years, oxides of La and Co have been added to strontium ferrite (SrFe 12 o 19 ) is widely used to obtain stable hexagonal ferrite crystals, larger magnetocrystalline anisotropy constant K1 and higher material saturation magnetization Ms value, and can further improve the magnetic properties of the product by improving the microstructure of the sintered body can. However, due to the rapid increase in the price of Co resources in the past two years, the cost of permanent ferrites has also increased, and Co resources, as a scar...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622H01F1/01
CPCC04B35/2633C04B35/622C04B2235/3208C04B2235/3213C04B2235/3225C04B2235/3284C04B2235/6562C04B2235/6567H01F1/01
Inventor吴云飞李军华杨武国
OwnerHENGDIAN GRP DMEGC MAGNETICS CO LTD