Method for preparing magnetic material of rare-earth permanent magnet ferrite

Abstract

The invention discloses a method for preparing magnetic material of rare-earth permanent magnet ferrite; a ferrite pre-burning material including strontium or barium is used as the main material to prepare the magnetic material of rare-earth permanent magnet ferrite with high performance after the adding of auxiliary agent, the wet milling process, the magnetic forming process and the high-temperature sintering; the invention uses the extracted carbonate mixture having rare-earth concentrate powder with rich lanthanum or having lanthanum rare-earth concentrate powder to replace the conventional pure rare-earth oxide or pure rare-earth hydroxide, and improves the properties of the ferrite magnet by the lanthanum element in the rare-earth; cerium replaces the cobaltous oxide to improve the coercive intensity; the substances such as iron, silicon, calcium and aluminium partially replace the non-rare-earth oxide auxiliary agent, which must be added; the permanent magnet ferrite prepared by the following method of the invention comprises the following magnetic properties: Br is greater than or equal to 390 mT; Hcj is greater than or equal to 250 kA / m, and BH(MAX) is greater than or equal to 25 kj / m3. The invention can make full use of rich lanthanum rare-earth in China, thereby reducing the production cost of ferrite.

Description

technical field [0001] The invention relates to a method for preparing a permanent ferrite magnetic material with a magnetoplumbite crystal structure, and more specifically relates to a method for preparing a high-performance rare earth permanent ferrite magnetic material by adding rare earth. Background technique [0002] Looking back at the production of magnetic materials, it can be found that: in the late 1960s, aluminum-nickel-cobalt was the main production of magnetic material products, and after the 1970s, it gradually turned to ferrite as the main body. Today, high-performance rare earth magnetic materials have been further developed. With the development of miniaturization, light weight and thinning technology of electronic equipment, there are higher and higher requirements for the volume, weight and performance of permanent ferrite devices. Especially the rapid development of automobile, motorcycle and microcomputer industry has stimulated the demand for permanent...

AI Technical Summary

Problems solved by technology

The common feature of the two existing technologies is that pure compounds are used to improve the magnetic properties of ferrite, and the synergistic effect between additives is not considered. In addition, since the rare earth resources are mostly symbiotic minerals, the separation and extraction process of pure rare earth compounds is very difficult. complex, and the price of the corresponding pure compound is very high, which will inevitably lead to the high production cost of the prior art to prepare rare earth permanent magnet ferrite, and the market competitiveness will decrease.

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