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Hexagonal crystal M+W mixed type sintered permanent magnetic ferrite magnet and preparation method thereof

A technology of permanent magnet ferrite and hexagonal crystal, which is applied in the field of hexagonal crystal M+W mixed sintered permanent ferrite magnet and its preparation, can solve the problems that it is difficult to expect a dramatic increase in magnetic performance, and achieve the effect of low cost

Active Publication Date: 2013-02-13
ANHUI SINOMAG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result of such efforts, the magnetic properties of M-type ferrite magnets are approaching their upper limit, and it is difficult to expect a dramatic improvement in magnetic properties

Method used

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  • Hexagonal crystal M+W mixed type sintered permanent magnetic ferrite magnet and preparation method thereof
  • Hexagonal crystal M+W mixed type sintered permanent magnetic ferrite magnet and preparation method thereof
  • Hexagonal crystal M+W mixed type sintered permanent magnetic ferrite magnet and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Research on the amount of La added:

[0042] Weigh the specified amount of iron oxide (Fe 2 o 3 ) powder (purity ≥ 99.0wt%, original average particle size of particles: 0.7 ~ 1.0μm), calcium carbonate (CaCO 3 ) powder, (purity ≥ 98.5wt%, original average particle size of particles: 2.0-5.0μm), strontium carbonate (SrCO 3 ) powder (purity ≥ 98.5wt%, original average particle size of particles: 1.0-2.0μm), barium carbonate (BaCO 3 ) powder (purity ≥ 98.5wt%, original average particle size of particles: 1.0-2.0μm), lanthanum oxide (La 2 o 3 ) powder (purity ≥ 99.0wt%, original average particle size of particles: 2.0 ~ 5.0μm), add 0.3wt% SiO to the above mixture 2 Powder (purity ≥ 98.0wt%, original average particle size of particles: 1.0μm), 0.1wt% H 3 BO 3Powder (purity ≥ 99.0wt%) and wet mixing, the average particle size of the mixture after mixing is 0.9μm. After the mixture was dried, it was prefired at 1280° C. in the atmosphere for 2 hours.

[0043] The obtai...

Embodiment 2

[0055] Mole study of iron:

[0056] Using the same iron oxide (Fe 2 o 3 ) powder, calcium carbonate (CaCO 3 ) powder, strontium carbonate (SrCO 3 ) powder, barium carbonate (BaCO 3 ) powder and lanthanum oxide (La 2 o 3 ) powder, formulated into Ca x1 Sr x2 Ba x3 La x Fe 2+ a Fe 3+ b The composition of Oy (where x1=0.15, x2=0.35, x3=0.3, x=0.2, a+b=11.5, 12.5, 13.5, 14.5 and 15.5). Add 0.3wt% SiO to the above mixture 2 powder, 0.1wt% H 3 BO 3 Powder and wet mixing, the average particle size of the mixture is 0.9μm. After the mixture was dried, it was prefired at 1280° C. in the air for 2 hours.

[0057] The obtained calcined material particles are subjected to dry coarse pulverization in a vibration mill to obtain a coarse powder with an average particle size of 3.0-5.0 μm.

[0058] Then, take 500 grams of the above-mentioned coarse powder, add 0.25wt% SiO 2 , 0.60wt% CaCO 3 , 0.80wt% Cr 2 o 3 , 0.10wt% H 3 BO 3 , 0.25wt% Al 2 o 3 , 0.20wt% ZnO, ...

Embodiment 3

[0070] Study on sintering atmosphere and carbon black addition:

[0071] Using the same iron oxide (Fe 2 o 3 ) powder, calcium carbonate (CaCO 3 ) powder, strontium carbonate (SrCO 3 ) powder, barium carbonate (BaCO 3 ) powder and lanthanum oxide (La 2 o 3 ) powder, formulated into Ca x1 Sr x2 Ba x3 La x Fe 2+ a Fe 3+ b The composition of Oy (x1=0.15, x2=0.35, x3=0.3, x=0.2, a+b=13.5). Add 0.3wt% SiO to the above mixture 2 Powder (purity ≥ 98.0wt%, original average particle size of particles: 1.0μm), 0.1wt% H 3 BO 3 Powder (purity ≥ 99.0wt%) and wet mixing, the average particle size of the mixture is 0.9μm. After the mixture was dried, it was prefired at 1280° C. in the air for 2 hours.

[0072] The obtained calcined material particles are subjected to dry coarse pulverization in a vibration mill to obtain a coarse powder with an average particle size of 3.0-5.0 μm.

[0073] Then, take 5 parts of each 500 grams of above-mentioned coarse powder material, add ...

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Abstract

The invention discloses a hexagonal crystal M+W mixed type sintered permanent magnetic ferrite magnet and a preparation method thereof. The composition formula of the hexagonal crystal M+W mixed type sintered permanent magnetic ferrite magnet is represented by Cax1Srx2Bax3LaxFe2+aFe3+bOy, wherein x1 is 0.1-0.3, x2 is 0.2-0.5, x3 is 0.1-0.4, x is 0.1-0.3, a is 0.1-1.0, b is 12.0-14.0, 12.1<=a+b<=15.0, and y=1+1 / 2x+a+3 / 2b. Lanthanum oxide is added, the mole number of iron in the M type ferrite is enhanced, and the oxygen concentration in the sintering process is controlled to provide a appropriate non-oxidizing atmosphere so as to inhibit the generation of the alpha-Fe2O3 phase, so that the M+W mixed type magnetoplumbite structure can be generated in the original M type permanent magnetic ferrite. The invention has the following advantages: (1) compared with the single-phase M type ferrite, the invention enhances the residual flux density (Br) of the material, and maintains the high coercive force (Hcj); (2) compared with the single-phase W type ferrite, the invention has simpler production technique, and can perform industrial production only by slightly adjusting the M type permanent magnetic ferrite production technique; and (3) the magnet is free of rare and noble metal cobalt, and thus, the cost is lower.

Description

technical field [0001] The invention relates to a high-performance permanent ferrite magnet, in particular to a hexagonal M+W mixed type sintered permanent ferrite magnet and a preparation method thereof. technical background [0002] M-type magnetoplumbite permanent ferrite magnet is a general term for compounds composed of divalent cation metal oxides (SrO and BaO) and ferric oxide (Fe2O3). Permanent ferrite magnets are widely used in automobiles and households. Electrical appliances, industrial automation and other industries. As a permanent ferrite material, strontium ferrite (SrFe 12 o 19 ) and barium ferrite (BaFe 12 o 19 )is widely used. For M-type ferrite magnets, the main focus is to make the particle size of the ferrite crystal grains close to the single domain particle size, to align the ferrite crystal grains in the direction of magnetic anisotropy, and to increase the density. efforts to transform. As a result of such efforts, the magnetic performance of ...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622
Inventor 翁革平
Owner ANHUI SINOMAG TECH
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