Preparation of toughened nano permanent magnetic material

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...

AI Technical Summary

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.