Magnetoplumbate-type permanent magnetic ferrite and manufacturing method thereof

A permanent magnet ferrite and magnetoplumbite technology, applied in the field of permanent magnets, can solve the problems of complex manufacturing process, high substitution of expensive element Co, high production cost, etc., and achieve good drainage effect and inhibited growth and molding cycle short effect

Inactive Publication Date: 2013-02-13
杨宗维
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Patent CN200610169039.1 is in the optimal formula of its embodiment 3 (57 # sample), the substitution amount of the expensive element Co is relatively high
Be 1000 grams of ferric oxide of 99% for every input mass percentage, need to add Co content and be 35.26 grams of cobalt oxide of 74%, its production cost is higher
And its manufacturing process is more complicated than that of conventional magnetoplumbite permanent magnet ferrite

Method used

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  • Magnetoplumbate-type permanent magnetic ferrite and manufacturing method thereof
  • Magnetoplumbate-type permanent magnetic ferrite and manufacturing method thereof
  • Magnetoplumbate-type permanent magnetic ferrite and manufacturing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Prepare Fe with mass fraction above 99% 2 O 3 powder, its SiO 2 The mass fraction of ≤0.015%, its chloride (Cl - ) mass fraction ≤ 0.15%; its average particle size is 0.95 μm; prepare SrCO with a mass fraction of more than 98% 3 Powder with an average particle size of 2 μm; mass fraction of more than 98.5% CaCO 3 Powder with an average particle size of 4 μm; mass fraction of more than 99% La 2 O 3 Powder with an average particle size of 4 μm; Cobalt oxide powder containing more than 72% Co, with an average particle size of 2.7 μm; ZrO with more than 99% 2 Powder with an average particle size of 1 μm. Press (1-x-y)CaO xSrO (y / 2)R 2 O 3 ·(n-z / 2-m / 2)Fe 2 O 3 ·zMO·mZrO 2 Calculate the addition amount of each main raw material, wherein x=0.1, y=0.6, z=0.25, m=0.04, n=4.9. Then the compound containing each element is accurately weighed according to the calculated amount, and each main raw material is wet-mixed. The mixing time was 4 hours. Then, the mixed raw ma...

Embodiment 2

[0046] The pre-sintered powder in Example 1 was used, and 0.6% calcium gluconate was added as a dispersant during finely pulverizing, and the rest were the same as those in Example 1. Its magnetic properties are shown in Table 1, and the microstructure of the obtained magnet is as follows figure 2 shown. The SEM analysis of the cross-section of the magnet shows that the crystal structure is relatively loose, the grain size is not uniform, the porosity is 1.1%, and there is no abnormal growth of grains.

Embodiment 3

[0048] The pre-sintered powder in Example 1 was used, and no dispersant was added during fine pulverization, and the rest were the same as those in Example 1. Its magnetic properties are shown in Table 1.

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Abstract

The invention relates to a magnetoplumbate-type permanent magnetic ferrite and a manufacturing method thereof, which relate to the field of the permanent magnet. Main component of the magnetoplumbate-type permanent magnetic ferrite is expressed by the following formula: (1-x-y)Ca0.xSrO.(y / 2)R2O3.(n-z / 2-m / 2)Fe2O3.zMO.MzrO2, wherein R is of at least one element of La, Nd and Pr and contains La, M is selected from at least one element of Co, Zn, Ni, Mn and Cu and contains Co, and x, y, z, m and n respectively indicating the addition ratio of each main metal element calculated at mol. By adopting optimized formula and process design and adding less Zr element, the Zr element is introduced into ferrite lattice during the pre-burning process so as to inhibit the growth of abnormal crystal particle and to reduce the pores; moreover, N(CH2CH2OH)3 dispersing agent is particularly added, the appearance of the powder particles is effectively controlled, so the obtained crystal particles are more uniform, the arrangement of the crystal structure is more compact, and the permanent magnetic ferrite material is obtained under the condition that substitute of the Co element is not high.

Description

Technical field: [0001] The invention relates to a magnetoplumbite-type permanent ferrite and a manufacturing method thereof, relates to the field of permanent magnets, and is particularly related to sintered permanent ferrites. Background technique: [0002] Ferrites are compounds composed of divalent cationic metal oxides and trivalent iron. Permanent magnet ferrite material is a functional material that generates a magnetic field. High-performance permanent magnet ferrite plays an important role in the electronics industry, information industry, motorcycles, power tools, automobile industry and other industries. A widely used ferrite material is Sr ferrite (SrFe) with an M-type magnetoplumbite structure. 12 O 19 ) and Ba ferrite (BaFe 12 O 19 ), these ferrites are made of iron oxide and carbonate of Sr or Ba by powder metallurgy. The final magnetic properties of the obtained magnets are generally determined by the remanence Br, the intrinsic coercivity H CJ to measu...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H01F1/10
Inventor向桥春王自敏杨宗维
Owner杨宗维