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A kind of permanent magnet ferrite material and preparation method thereof

A technology of permanent magnet ferrite and raw materials, applied in the field of ferrite, can solve the problems of limited reserves, difficult magnetic performance, and can not meet the requirements of high-end motors and motors, and achieve the effect of improving magnetic performance

Active Publication Date: 2021-04-20
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 Co element, as described in the patent CN201080030766.4, etc., its magnetic properties can reach Br ≥ 4600Gs, Hcb ≥ 4000Oe, Hcj ≥ 5000Oe, and the magnetic properties of the permanent magnet ferrite material without Co element It is difficult to meet Br≥4200Gs, Hcb≥3700Oe, Hcj≥4200Oe at the same time, which cannot meet the requirements of some high-end motors

Method used

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  • A kind of permanent magnet ferrite material and preparation method thereof
  • A kind of permanent magnet ferrite material and preparation method thereof
  • A kind of permanent magnet ferrite material and preparation method thereof

Examples

Experimental program
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Effect test

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 field of ferrite technology. The invention discloses a permanent magnet ferrite material whose chemical formula is Sr 1‑ x Ca x Fe 12‑y‑z Y y Zn z o 19 , wherein 0≤x≤0.2, 0.1≤y≤0.2, 0≤z≤0.1; the invention also discloses a preparation method of a permanent magnet ferrite material, which includes batching, primary ball milling, pre-calcination, secondary ball milling, Forming, sintering and post-processing steps. The present invention has the effect of ion substitution through the joint addition of calcium oxide, yttrium oxide and zinc oxide to the existing strontium ferrite, and improves the magnetic performance of the permanent magnet ferrite not containing Co element.

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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Patent Type & Authority Patents(China)
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
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD