Preparation of toughened nano permanent magnetic material

A permanent magnetic material and toughening technology, which is applied in the field of preparation of toughened nano permanent magnetic materials, can solve the problems of particularly high strength requirements, easy breakage, and large vibration of magnetic materials, achieve short production cycles and improve magnetic properties , the effect of sufficient solid phase reaction

Inactive Publication Date: 2009-07-08
LIAONING WUHUAN ENG TECH
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  • Summary
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Problems solved by technology

However, due to the relatively harsh operating environment of the car, for example, the operating temperature should be in the temperature range of -50°C to 125°C; the vibration is large during operation, and the strength of the magnetic material is particularly high. Ordinary materials are easily broken in the strong vibration of the car. Therefore, if domestic enterprises want to achieve development, they must break through these technical difficulties and develop high-performance permanent magnet ferrite materials with higher fracture toughness and wider working temperature.

Method used

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Examples

Experimental program
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Effect test

example 1

[0017] 1. First, the nano-SrCO 3 and Fe 2 o 3 Dosing according to the mole percentage of 1:5.9, and then in the environment of ethanol solution, use agate balls for ball milling, and add 0.2% La 2 o 3 and 0.6% Co 2 o 3 , in order to achieve the purpose of fully mixing and refining the raw material powder; spray granulate the raw material after ball milling, and the particle size is 0.5-2.5 mm, and then put it in a high-temperature furnace for solid-state reaction. In an air atmosphere, the temperature is 900 ° C ~ 1150 ° C, and the temperature is kept for 12 hours to synthesize Sr 1-x La x Fe 12-y co y o 19 powder;

[0018] 2. The synthesized powder is subjected to secondary ball milling, followed by magnetic field forming for secondary ball milling, then magnetic field forming, and finally placed in a high-temperature furnace for isostatic sintering. The sintering temperature is 1100°C to 1200°C. It is the finished product of the present invention.

Embodiment 2

[0020] 1. First, the nano-SrCO 3 and Fe 2 o 3 Dosing according to the molar percentage of 1:5.6, and then in the ethanol solution environment, use agate balls for ball milling, and add 0.5% La by weight during the ball milling process 2 o 3 and 0.5% Co 2 o 3 ; Spray and granulate the ball-milled raw materials, and place them in a high-temperature furnace for solid-phase reaction. Air atmosphere is used for sintering, the temperature is 900℃~1150℃, and the temperature is kept for 12 hours;

[0021] 2. The synthesized Sr 0.85 La 0.15 Fe 11.5 co 0.15 o 19 The powder is subjected to secondary ball milling, and then subjected to magnetic field molding; finally placed in a high-temperature furnace for sintering, the sintering temperature is 1100°C-1200°C, and the finished product of the present invention is obtained after 2 hours of heat preservation.

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Abstract

The invention relates to a preparation method for plasticized type nanometer permanent magnetic material. The preparation method comprises the following steps: mixing nanometer SrCO3 and Fe2O3 according to a certain proportion, carrying out the intensive mixing and re-thinning of the raw material powder through ball milling, and adding rare earth oxides of La2O3 and Co2O3 during the ball milling according to a certain proportion; carrying out the spray granulation of the raw materials after ball milling, and placing the raw materials in a high temperature furnace for a solid phase reaction; carrying out a second ball milling of the synthesized Sr1-xLaxFe12-yCoyO19 powder, and carrying out the magnetic field forming of the powder after ball milling; and finally placing the formed powder in the high temperature furnace for sintering. The preparation method adopts the nanometer level SrCO3 and Fe2O3 as the raw materials; compared with the conventional method adopting the raw materials at a micron level or with a greater particle size, the preparation method has the sufficient solid phase reaction, the high product purity and the low reaction temperature; and compared with other methods, the preparation method has a simple and economical process and a short production cycle, and is more suitable for the industrialized production.

Description

technical field [0001] The invention relates to a preparation method of permanent magnet ferrite, in particular to a preparation method of a toughened high-performance toughened nano permanent magnet material. Background technique [0002] At present, with the rapid development of my country's automobile industry (the output of automobiles in 2007 was 8.8 million, and it will increase to 10 million by 2010, becoming the third largest producer in the world), the domestic demand for high-performance permanent magnet ferrite volume is growing. However, due to the relatively harsh operating environment of the car, for example, the operating temperature should be in the temperature range of -50°C to 125°C; the vibration is large during operation, and the strength of the magnetic material is particularly high. Ordinary materials are easily broken in the strong vibration of the car. Therefore, if domestic enterprises want to achieve development, they must break through these techni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/40C04B35/622H01F1/11
Inventor 倪日亮冯泉于忠淇米世成刘贵林张宪伟
Owner LIAONING WUHUAN ENG TECH
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