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Low-temperature coefficient permanent magnet ferrite material and its production method

A technology of permanent ferrite and low temperature coefficient, applied in the direction of inorganic material magnetism, can solve the problems of high production cost, high temperature coefficient, low temperature coefficient, etc., and achieve the goal of reducing design requirements, low temperature coefficient and reducing production cost Effect

Inactive Publication Date: 2008-01-16
李凌峰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention mainly aims at the problems of high temperature coefficient existing in the prior art and the addition of expensive elements such as La, Co, Bi, and high production cost, and provides a method without adding elements such as La, Co, Bi, which has a lower Low temperature coefficient permanent magnet ferrite material with temperature coefficient and high magnetic performance and manufacturing method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Use commercially pure Fe 2 o 3 , SrCO 3 , BaCO 3 , CaCO 3 , SiO 2 , Al 2 o 3 , CuO, V 2 o 5 For the raw material. The average particle size of various raw materials is <3μm.

[0026] ①According to Fe 2 o 3 83.2mol%, SrCO 3 12mol%, BaCO 3 2.5mol%, CuO 1.5mol%, V 2 o 5 Calculate for 0.8 mol% and weigh the corresponding weight of raw materials.

[0027] ② Put the weighed raw materials into the ball mill, and add steel balls and water according to the weight ratio of material: ball: water = 1: 3: 1.2, and discharge after 3 hours of ball milling. When the slurry is dehydrated to a water content of 6-10 wt%, particles of Φ5-10 μm are produced.

[0028] ③Put the prepared Φ5~10μm pellets into an air furnace for primary sintering at 1250°C, keep warm for 1 hour and then cool with the furnace. The oxygen atmosphere needs to be sufficient during sintering. Fe in the obtained primary sintered material 2+ Content<0.11wt%.

[0029] ④The primary sintered material ...

Embodiment 2

[0037] Use commercially pure Fe 2 o 3 , SrCO 3 , BaCO 3 , CaCO 3 , SiO 2 , Al 2 o 3 , CuO, V 2 o 5 For the raw material. The average particle size of various raw materials is <3μm.

[0038] ①According to Fe 2 o 3 is 81.2mol%, SrO is 11mol%, BaO is 3.5mol%, CuO is 2.2mol%, V 2 o 5 Calculate for 1.1 mol% and weigh the corresponding weight of raw materials.

[0039] ② Put the weighed raw materials into the ball mill, and add steel balls and water according to the weight ratio of material: ball: water = 1: 3: 1.2, and discharge after 5 hours of ball milling. When the slurry is dehydrated to a water content of 6-10 wt%, particles of Φ5-10 μm are produced.

[0040] ③Put the prepared Φ5~10μm pellets into an air furnace for primary sintering at 1240°C, keep warm for 3 hours and then cool with the furnace. The oxygen atmosphere needs to be sufficient during sintering. Fe in the obtained primary sintered material 2+ Content<0.11wt%.

[0041] ④The primary sintered mate...

Embodiment 3

[0049] Use commercially pure Fe 2 o 3 , SrCO 3 , BaCO 3 , CaCO 3 , SiO 2 , Al 2 o 3 , CuO, V 2 o 5 For the raw material. The average particle size of various raw materials is <3μm.

[0050] ①According to Fe 2 o 3 is 80.1mol%, SrO is 10.6mol%, BaO is 4.5mol%, CuO is 3.2mol%, V 2 o 5 1.61 mol% is calculated and the corresponding weight of raw materials is weighed.

[0051] ② Put the weighed raw materials into the ball mill, and add steel balls and water according to the weight ratio of material: ball: water = 1: 3: 1.2, and discharge the material after ball milling for 1 hour. When the slurry is dehydrated to a water content of 6-10 wt%, particles of Φ5-10 μm are produced.

[0052] ③Put the prepared Φ5~10μm pellets into an air furnace for primary sintering, the sintering temperature is 1280°C, keep warm for 0.5 hours and then cool with the furnace. The oxygen atmosphere needs to be sufficient during sintering. Fe in the obtained primary sintered material 2+ Con...

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Abstract

The invention relates to a material used in the ferrite magnetic material industry and the production method thereof, in particular to a low-temperature coefficient permanent magnetic ferrite material and the production method thereof. Directed at the prior art's problems such as high temperature coefficient, the addition of expensive factors including La, Co, and Bi, and high production cost, the invention provides a low-temperature coefficient permanent magnetic ferrite material and the production method thereof without adding factors such as La, Co, and Bi. The materials of the invention area: The main phase is magnetoplumbite structure, and the chemical equation is: Sr1-xAxFe12-yMyO19, wherein: A=Ca, Na, Ba, Pb, K 1-2 types, x=0.05-0.5; M=Al, Cr, Zn2 / 3V1 / 3, Zn2 / 3Nb1 / 3, Cu2 / 3V1 / 3, Cu2 / 3Nb1 / 3, Zn1 / 2Ge1 / 2, Zn1 / 2Si1 / 2, Cu1 / 2Ga1 / 2, Cu1 / 2Si1 / 2 1-3 types.

Description

technical field [0001] The invention relates to a material and a manufacturing process used in the ferrite magnetic material industry, in particular to a low temperature coefficient permanent magnet ferrite material and a manufacturing method. Background technique [0002] Permanent ferrite material is a functional material with a wide range of applications. With the development of science and technology, the requirements for magnetic materials are getting higher and higher. More and more occasions, such as high torque motors, automotive motors, motors for alpine and deep sea operations, and various magnetron magnetic systems, due to the harsh external environment, there are high temperature, low temperature, vibration, shock, DC electromagnetic field interference, etc. Influence, it often requires a magnetic material with high magnetic field strength, good stability and reliability, and requires a low temperature coefficient at the same time as high performance. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/10C04B35/26C04B35/64
Inventor 秦福明
Owner 李凌峰
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