High performance strontium-calcium permanent magnetic ferrite magnet and preparation method thereof

A ferrite and strontium-calcium permanent magnet technology is applied in the field of high-performance strontium-calcium permanent magnet ferrite magnet and its preparation, which can solve the problems of reducing production cost, unable to further improve production efficiency, etc., so as to reduce production cost and prevent crystal grains. The effect of growing up and improving the eigenparameters

Inactive Publication Date: 2015-06-10
马鞍山市鑫洋永磁有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the deficiency that the current permanent ferrite magnet cannot further improve production efficiency and reduce production cost in the sintering process, the present invention provides a high-performance strontium-calcium permanent ferrite magnet and a preparation method thereof, further improving the performance of permanent ferrite. The production efficiency of the magnet sintering process reduces the production cost and meets the needs of large-scale industrial production of permanent ferrite magnets

Method used

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  • High performance strontium-calcium permanent magnetic ferrite magnet and preparation method thereof
  • High performance strontium-calcium permanent magnetic ferrite magnet and preparation method thereof
  • High performance strontium-calcium permanent magnetic ferrite magnet and preparation method thereof

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Effect test

Embodiment 1

[0034] The requirements and corresponding weights of raw materials selected in a batching process are as follows:

[0035] ①Iron oxide (Fe 2 o 3 ) powder (purity ≥ 99.0wt%, original average particle size of particles: 0.9μm), weight 1271.0Kg;

[0036] ②Calcium carbonate (CaCO 3 ) powder (purity ≥ 98.5wt%, original average particle size of particles: 1.0 μm), weight 60.7Kg;

[0037] ③ strontium carbonate (SrCO 3 ) powder (purity ≥ 98.5wt%, original average particle size of particles: 1.0 μm), weight 44.3Kg;

[0038] ④ Lanthanum oxide (La 2 o 3 ) powder (purity ≥ 99.0wt%, original average particle size of particles: 1.0 μm), weight 99.8Kg;

[0039] ⑤ cobalt oxide (Co 3 o 4 ) powder (purity calculated based on cobalt content ≥ 72.0%, original average particle size of particles: 1.0 μm), weight 25.1Kg. (The particle size of raw material is too small, will cause the generation of fine particle after calcining and ball milling, is unfavorable for forming; The particle size...

Embodiment 2

[0064] The requirements and corresponding weights of raw materials selected in a batching process are as follows:

[0065] ①Iron oxide (Fe 2 o 3 ) powder (purity ≥ 99.0wt%, original average particle size of particles: 1.1 μm), weight 1264.0Kg;

[0066] ②Calcium carbonate (CaCO 3 ) powder (purity ≥ 98.5wt%, original average particle size of particles: 2.0 μm), weight 45.1Kg;

[0067] ③ strontium carbonate (SrCO 3 ) powder (purity ≥ 98.5wt%, original average particle size of particles: 2.0 μm), weight 66.8Kg;

[0068] ④ Lanthanum oxide (La 2 o 3 ) powder (purity ≥ 99.0wt%, original average particle size of particles: 2.0 μm), weight 99.5Kg;

[0069] ⑤ cobalt oxide (Co 3 o 4 ) powder (purity calculated based on cobalt content ≥ 72.0%, original average particle size of particles: 2.0 μm), weight 25.1Kg.

[0070] Add the above-mentioned weighed raw materials into a 1.5T ball mill without adding any additives, add 1.5 tons of water, and ball mill for 5 hours, then the mixe...

Embodiment 3

[0079] The requirements and corresponding weights of raw materials selected in a batching process are as follows:

[0080] ①Iron oxide (Fe 2 o 3 ) powder (purity ≥ 99.0wt%, original average particle size of particles: 1.5μm), weight 1271.0Kg;

[0081] ②Calcium carbonate (CaCO 3 ) powder (purity ≥ 98.5wt%, original average particle size of particles: 1.4 μm), weight 60.7Kg;

[0082] ③ strontium carbonate (SrCO 3 ) powder (purity ≥ 98.5wt%, original average particle size of particles: 1.6 μm), weight 44.3Kg;

[0083] ④ Lanthanum oxide (La 2 o 3 ) powder (purity ≥ 99.0wt%, original average particle size of particles: 1.3 μm), weight 99.8Kg;

[0084] ⑤ cobalt oxide (Co 3 o 4 ) powder (purity calculated based on cobalt content ≥ 72.0%, original average particle size of particles: 1.7 μm), weight 25.1Kg.

[0085] Add the above-mentioned weighed raw materials into a 1.5T ball mill without adding any additives, add 1.5 tons of water, and ball mill for 5 hours, then the mixed...

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Abstract

The invention provides a high performance strontium-calcium permanent magnetic ferrite magnet and a preparation method thereof; and the invention belongs to the field of permanent magnetic materials. The magnet has a principal phase of a hexagonal crystal structure. The principal phase of the hexagonal crystal structure consists of metal elements represented by a formula of Sr(x)Ca(y)La1-x-yFe(z)Co(m), and the formula satisfies the conditions that: x is greater than or equal to 0.2 and less than or equal to 0.8; y is greater than or equal to 0.1 and less than or equal to 0.4; z is greater than or equal to 9.0 and less than or equal to 11.0; m is greater than or equal to 0.1 and less than or equal to 0.2; and y / m is greater than or equal to 1.5 and less than or equal to 2.0; meanwhile, by the cooperative use of a secondary additive, the magnet has a high magnetic performance that Br: 4200 Gs - 4600 Gs, Hcj: 4000 Oe - 5600 Oe, and a rectangle degree Hk / Hcj higher than 0.90. In the high performance strontium-calcium permanent magnetic ferrite magnet and the preparation method thereof, a radial shrinkage ratio of a sintered magnet is ranging from 1.10 to 1.12 by controlling the content of silicon in a primary pre-sintering powder material and the secondary additive, thus increasing the production efficiency of the sintering process, reducing the production cost, and meeting the requirements of a massive industrial production.

Description

technical field [0001] The present invention relates to the field of permanent magnet materials, more specifically, to a high-performance strontium-calcium permanent ferrite magnet and a preparation method thereof. The strontium-calcium permanent ferrite magnet is widely used in the fields of automobiles, household appliances or electric tools, etc. . Background technique [0002] Hexagonal magnetoplumbite permanent ferrite magnet is composed of divalent cation metal oxides (SrO and BaO) and ferric oxide (Fe 2 o 3 ) is a general term for compounds composed of permanent ferrite magnets, which are widely used in industries such as automobiles, household appliances and industrial automation. As a permanent ferrite material, strontium ferrite (SrFe) with hexagonal magnetoplumbite structure 12 o 19 ) and barium ferrite (BaFe 12 o 19 )is widely used. There are two main parameters affecting the magnetic properties of permanent ferrite materials, namely residual magnetic indu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 李东
Owner 马鞍山市鑫洋永磁有限责任公司
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