m-type calcium lanthanum cobalt permanent magnet ferrite and preparation method thereof

A permanent magnet ferrite and ferrite technology, applied in the field of permanent magnet materials, can solve the problems of differences in grain size, different anti-demagnetization ability, Hk/Hcj and comprehensive magnetic performance decline, etc., to achieve improved magnetic performance, excellent Comprehensive magnetic performance, improve the effect of remanence

Active Publication Date: 2016-12-28
江门江益磁材有限公司
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  • Abstract
  • Description
  • Claims
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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 lanthanum cobalt permanent magnet ferrite and preparation method thereof
  • m-type calcium lanthanum cobalt permanent magnet ferrite and preparation method thereof
  • m-type calcium lanthanum cobalt permanent magnet ferrite and preparation method thereof

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preparation example Construction

[0058] Please refer to figure 1 , figure 1 The flow chart of the preparation method of the M type calcium lanthanum cobalt permanent magnet ferrite that the embodiment of the present invention provides, as figure 1 Shown, the preparation method of the M type calcium lanthanum cobalt permanent magnet ferrite provided by the invention comprises the steps:

[0059] 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 the main material powder with the additive;

[0060] S2. One-time ball milling: put the material powder into the ball mill for grinding, add ...

Embodiment 1

[0071] The M-type calcium lanthanum cobalt permanent magnet ferrite provided in this embodiment includes a hexagonal ferrite main phase of elements such as A, R, Ca, Fe and M, and has a molecular formula with the following characteristics: A 1-x-y Ca x R y Fe 2n-z m z o 19 , where A is Sr, R is 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 lanthanum cobalt permanent magnet ferrite provided in this embodiment is Sr 0.7 Ca 0.05 La 0.25 Fe 11.47 (Ni 0.03 co 0.10 )O 19 .

Embodiment 2

[0073] The M-type calcium lanthanum cobalt permanent magnet ferrite provided in this embodiment includes a hexagonal ferrite main phase of elements such as A, R, Ca, Fe and M, and has a molecular formula with the following characteristics: A 1-x-y Ca x R y Fe 2n-z m z o 19 , where A is Ba, R is 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 lanthanum cobalt permanent magnet ferrite provided by the present embodiment is Ba 0.7 Ca 0.05 La 0.25 Fe 11.47 (Ni 0.03 co 0.10 )O 19 .

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Abstract

The invention discloses an M-type calcium lanthanum cobalt permanent magnet ferrite, which includes a hexagonal ferrite main phase of elements such as A, R, Ca, Fe and M, and has a molecular formula with the following characteristics: A 1‑x‑y Ca x R y Fe 2n‑ z m z o 19 , wherein, A is a combination of Sr or Ba or Sr and Ba, R is La, M is a combination of at least one of Ni and Zn and Co; x, y, z represent the added molar weight of each main metal element, x The value range of is 0.05-0.19, y is 0.2-0.29, z is 0.10-0.24, and n is 5.80-5.90. At the same time, a method for preparing M-type calcium lanthanum cobalt permanent magnet ferrite is also disclosed. Before the sintering step, a drying step, a primary pre-burning step and a secondary pre-burning step are arranged in the method. The M-type calcium lanthanum cobalt permanent magnet ferrite provided by the invention has high comprehensive magnetic properties, and the preparation method can effectively improve the sample without reducing the coercive force when the pre-firing temperature is 1150°C or lower. remanence, so as to obtain more excellent comprehensive magnetic properties.

Description

technical field [0001] The invention relates to the technical field of permanent magnet materials, in particular to an M-type calcium lanthanum cobalt 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...

Claims

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Application Information

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