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M-type permanent magnetic ferrite additive and preparation method thereof

A permanent magnet ferrite and additive technology, applied in the field of permanent magnet materials, can solve problems such as fluctuations, effective loss of additive components, additive loss performance, etc., to achieve obvious effects, reduce cracks and blocks, and shorten ball milling time

Inactive Publication Date: 2014-05-28
ANHUI SINOMAG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Therefore, in order to solve the technical difficulty of effective loss of a series of additives such as calcium carbonate, lanthanum oxide, silicon dioxide, etc. that exist in actual production, the present invention starts with the microcosmic regranulation of additives and provides a minimum use of additives, And prevent the performance fluctuation problem caused by the loss of additives in production

Method used

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  • M-type permanent magnetic ferrite additive and preparation method thereof
  • M-type permanent magnetic ferrite additive and preparation method thereof
  • M-type permanent magnetic ferrite additive and preparation method thereof

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Embodiment

[0020] (1) Additive mixing

[0021] According to the molecular formula F x A y C 1-y P 1-x-z Q z h v BO (5x*y / v+4v*3y / 7) , F is Ca, x=0.0-0.37, A is La, y=0.13-0.38, z=0.33-0.73, v=0.02-0.57, C is Al, P is Zr, Q is Si; calculate the corresponding oxide weight , mix evenly, according to the quality of additive: the quality of ball: the ratio of the mass ratio of water is 1:1.5 puts raw material into ball mill and carries out wet ball milling, and ball milling time is controlled at 60 hours, and the average grain size of the mixed material after ball milling is not more than 0.5 μ m ;

[0022] (2) Pre-burning

[0023] After the ball milling is completed, the slurry is dried, and then the slurry is pre-fired in an oxygen-rich atmosphere and a mixed gas atmosphere with a nitrogen content not higher than 0.05%. The pre-fire temperature is 1130-1200°C, and the holding time is 0.6- 3 hours, obtain additive coarse powder;

[0024] (4) Coarse crushing

[0025] After the pre-...

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Abstract

The invention discloses an M-type permanent magnetic ferrite additive and a preparation method thereof. A molecular structure of the M-type permanent magnetic ferrite additive is FxAyC1-yP1-x-zQzHvBO(5x*y / v+4v*3y / 7), wherein x, y, z and v adopt micro stoichiometric mole ratios; x is equal to 0.0-0.37; y is equal to 0.13-0.38; z is equal to 0.33-0.73; v is equal to 0.02-0.57; F is more than two elements of Ca, Ti, Sr and Co; A is at least one element of La, Pr and Bi; C is one element of Al, Ga and Si; P is one or two elements of F, Sn, Pd and Zr; Q is Si. The prepared additive realizes short wet ball milling time of slurry during industrial production, a high-performance product can be still produced under the condition of a greater particle size, the possibility of cracks and chipping of the final product is reduced obviously.

Description

technical field [0001] The invention relates to an M-type permanent magnet ferrite additive and a preparation method thereof, belonging to the field of permanent magnet materials. Background technique [0002] With the development of microelectronics technology and electronic devices towards small, thin and precise, at the same time, the requirements for the magnetic performance parameters of permanent magnet ferrite are getting higher and higher, such as high saturation magnetic flux density, high intrinsic coercive force, High magnetic energy levels, etc. At present, the existing technology is mainly reflected in the sintering process of pre-sintered material, the formula of secondary micropowder and the sintering process such as Chinese patent application (201310017992.4). The existing wet ball milling process is difficult to ensure the mixing uniformity of the mixture and the effective interaction between the micro-molecules in the additive addition method, which deviat...

Claims

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Application Information

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IPC IPC(8): C04B35/63C04B35/26
Inventor 刘野
Owner ANHUI SINOMAG TECH