M-type calcium permanent magnet ferrite and preparation method thereof

A permanent magnet ferrite and ferrite technology, applied in the direction of magnetism of inorganic materials, can solve problems such as different anti-demagnetization ability, difference in grain size, Hk/Hcj and comprehensive magnetic performance decline, so as to improve the final magnetic performance , reduce the sintering temperature, and ensure the effect of comprehensive magnetic properties

Active Publication Date: 2017-06-16
江门江益磁材有限公司
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  • Abstract
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Problems solved by technology

It was found that the squareness ratio (Hk / Hcj) of the sintered samples decreased with the increase of the doping amount of LaCo, and the reduced squareness ratio was mainly due to the incomplete reaction of the pre-sintered material and the grain size of the pre-sintered material after doping substitution. There are different degrees of doping substitution, so that the grain size is different, and Hcj is closely related to the grain size, and grains of different sizes have different Hcj, so the anti-demagnetization ability is different, which eventually leads to Hk / Hcj and comprehensive magnetic properties. Decline

Method used

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  • M-type calcium permanent magnet ferrite and preparation method thereof
  • M-type calcium permanent magnet ferrite and preparation method thereof
  • M-type calcium permanent magnet ferrite and preparation method thereof

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preparation example Construction

[0068] Please refer to figure 1 , figure 1 The flow chart of the preparation method of the M-type calcium permanent magnet ferrite that the embodiment of the present invention provides, such as figure 1 Shown, the preparation method of the M type calcium permanent magnet ferrite provided by the invention comprises the steps:

[0069] S1. Ingredients: according to chemical structural formula A 1-x-y Ca x R y Fe 2n-z m z o 19 The composition requires the preparation of main material powder; add additive H by weight percentage 3 BO 3 , SiO 2 , CaCO 3 , La 2 o 3 、Co 3 o 4 and SrCO 3 , each component accounts for A 1-x-y Ca x R y Fe 2n-z m z o 19 The weight percentage is 0≤H 3 BO 3 ≤0.5%, 0≤SiO 2 ≤1.0%, 0.1%≤CaCO 3 ≤1.2%, 0≤La 2 o 3 ≤1.0%, 0≤Co 3 o 4 ≤1.0%, 0≤SrCO 3 ≤0.8%; and mixing and stirring the main material powder and the additive into a material powder;

[0070] S2, a ball mill: Put the powder into the ball mill for grinding, add steel balls w...

Embodiment 1

[0082] The M-type calcium permanent magnet ferrite provided by this embodiment includes the hexagonal ferrite main phase of elements such as A, R, Ca, Fe and M, and has the molecular formula of the following characteristics: A 1-x-y Ca x R y Fe 2n-z m z o 19 , where A is Sr, R is a combination of Pr and La, M is a combination of Ni and Co, the value of x is 0.05, y is 0.25, z is 0.13, and n is 5.80. That is, the characteristic molecular formula of the M-type calcium permanent magnet ferrite provided by the present embodiment is Sr 0.7 Ca 0.05 (La 0.20 PR 0.05 )Fe 11.47 (Ni 0.03 co 0.10 )O 19 .

Embodiment 2

[0084] The M-type calcium permanent magnet ferrite provided by this embodiment includes the hexagonal ferrite main phase of elements such as A, R, Ca, Fe and M, and has the molecular formula of the following characteristics: A 1-x-y Ca x R y Fe 2n-z m z o 19 , wherein A is Ba, R is a combination of Nd and La, M is a combination of Ni and Co, the value of x is 0.05, y is 0.25, z is 0.13, and n is 5.80. That is, the characteristic molecular formula of the M-type calcium permanent magnet ferrite provided by the present embodiment is Ba 0.7 Ca 0.05 (La 0.21 Nd 0.04 )Fe 11.47 (Ni 0.03 co 0.10 )O 19 .

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Abstract

The invention discloses an M-type calcium permanent magnetic ferrite comprising a main phase of a hexagonal ferrite containing elements such as A, R, Ca, Fe and M and has the following molecular formula: Al-x-yCaxRyFe2n-zMzO19, wherein A is Sr or Ba or a combination of Sr and Ba, R is a combination of La and at least one of Pr, Nd and Bi, M is a combination of Co and at least one of Ni and Zn, x, y, z and n represent the adding proportions of all the main metal elements, the value of x ranges from 0.05 to 0.19, the value of y ranges from 0.2 to 0.29, the value of z ranges from 0.10 to 0.24, and the value of n ranges from 5.80 to 5.90. Meanwhile, the invention discloses a preparation method of the M-type calcium permanent magnetic ferrite. According to the preparation method, a drying step, a primary pre-sintering step and a secondary pre-sintering step are set before a sintering step. The M-type calcium permanent magnetic ferrite disclosed by the invention has relatively high comprehensive magnetic performance; and by using the preparation method, the residual magnesium of a sample can be effectively improved under the condition that the coercive force is not reduced when the pre-sintering temperature is 1150 DEG C or lower, so that the comprehensive magnetic performance is more excellent.

Description

technical field [0001] The invention relates to the technical field of permanent magnet materials, in particular to an M-type calcium permanent magnet ferrite and a preparation method thereof. Background technique [0002] According to its characteristics and uses, ferrite is generally divided into five categories: permanent magnet, soft magnet, moment magnet, gyromagnetic and compressed ferrite. [0003] The final magnetic properties of permanent ferrite are generally measured by remanence Br and intrinsic coercive force HCJ. Among them, the high-performance permanent magnet ferrite usually refers to the ferrite that has the advantages of high residual magnetic induction, strong anti-demagnetization performance and low manufacturing cost. Due to these advantages, high-performance permanent ferrites are widely used in industries such as electronics, information, motorcycles, automobiles, and electric tools. [0004] The traditional ferrite material used in large quantities...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/10C04B35/26C04B35/622C04B35/64
Inventor 汪南东陈中艳王凡冯则坤吴捷
Owner 江门江益磁材有限公司
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