Plumbite type yttrium permanent magnetic ferrite material and preparation method thereof

A permanent magnet ferrite and magnetoplumbite technology, applied in the field of new magnetoplumbite type yttrium series permanent ferrite material and its preparation, can solve the problem that it is difficult to achieve, Br is difficult to achieve, and ferrite devices cannot be prepared. problems, to save energy, improve efficiency, and avoid the difficulty of forming magnetic parts

Inactive Publication Date: 2013-06-26
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above first and second types are generally called Ba or Sr ferrite or partial ion substitution (replacement) barium ferrite and strontium ferrite. The disadvantage is that they cannot be prepared into ferrite devices when the sintering temperature is ≤1150 °C. , and Br is difficult to reach 4.2 ~ 4.75kGs, H cj It is difficult to reach 4.5~5.0kOe

Method used

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  • Plumbite type yttrium permanent magnetic ferrite material and preparation method thereof
  • Plumbite type yttrium permanent magnetic ferrite material and preparation method thereof
  • Plumbite type yttrium permanent magnetic ferrite material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0028] The main raw material is La 2 o 3 , Y 2 o 3 , Fe 2 o 3 and Co 3 o 4 , a small amount of SrCO 3 、Al 2 o 3 、Cr 2 o 3 , B 2 o 3 , SiO 2 , the main components after sintering satisfy the following molar ratios:

[0029] R 1-x-y Y x La y O nFe (12-z) / n co z / n o 3

[0030] When x=0.24, y=0.60, R 1 When Sr=0.16, z=0.27, n=5.95,

[0031] Immerse the raw material powder in water according to the above molar ratio, and mix it in a ball mill for 3 hours to obtain a mixture of suspended particles with a particle size of 0.1-2.0 μm. It is pre-calcined at 1290°C for 3 hours in an air atmosphere, and XRD analysis determines that the phase is Contains 95 wt% M phase, while its main grain size is 9 μm.

[0032] Grind in a ball mill until the average particle size is less than or equal to 5.0 μm, and the specific surface area of ​​the ground powder (obtained by BET method) is 7m 2 / g.

[0033] Heat treatment at a temperature of 700° C. under an air atmosphere an...

Embodiment 2

[0038] The main raw material is La 2 o 3 , Y 2 o 3 , Fe 2 o 3 and Co 3 o 4 , a small amount of SrCO 3 , Al 2 o 3 , Cr 2 o 3 , B 2 o 3 , SiO 2 . The main components after sintering satisfy the following molar ratios:

[0039] R 1-x-y Y x La y O nFe (12-z) / n co z / n o 3

[0040] When x=0.38, y=0.50, R 1 For Sr=0.12, z=0.45, n=6.0,

[0041] According to the above molar ratio, the raw material powder was mixed in water for 5 hours in a ball mill to obtain a mixed material with a suspended particle size of 1.5 μm. Pre-fired at 1280°C for 2 hours in air atmosphere. XRD confirms that the phase usually contains 90wt% M phase, and its main grain size is 10 μm.

[0042] Grind in a ball mill until the average particle size becomes a powder less than or equal to 5.0 μm, and the specific surface area of ​​the obtained grinding powder (obtained by BET method) is 9m 2 / g.

[0043] Carry out heat treatment in the air atmosphere, the temperature is 800 ℃, keep warm f...

Embodiment 3

[0048] The main raw material is La 2o 3 , Y 2 o 3 , Ce 2 o 3 , Fe 2 o 3 and Co 2 o 3 , a small amount of SrCO 3 , Al 2 o 3 , Cr 2 o 3 , B 2 o 3 , SiO 2 . The main components after sintering satisfy the following molar ratios:

[0049] R 1-x-y Y x La y O nFe (12-z) / n co z / n o 3

[0050] x=0.10, y=0.43, R 1 For Sr=0.26, R 2 When Ce=0.21, z=0.33, n=6.1,

[0051] According to the above molar ratio, the raw material powder was mixed in water for 5 hours in a ball mill to obtain a mixed material with a suspended particle size of 1.5 μm. Pre-fired at 1200°C for 2 hours in air atmosphere. XRD confirms that the phase contains 95wt% M phase, and its main crystal grain is 10 μm.

[0052] Grind in a ball mill until the average particle size becomes a powder less than or equal to 5.0 μm, and the specific surface area of ​​the obtained grinding powder (obtained by BET method) is 9m 2 / g.

[0053] Carry out heat treatment under the air atmosphere, the temperatu...

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Abstract

The invention discloses a plumbite type yttrium permanent magnetic ferrite material and a preparation method thereof. The plumbite type yttrium permanent magnetic ferrite material is a hexagonal system, the chemical structural formula of which is R1-x-yYxLayO.nFe(12-z)/nCoz/nO3, wherein x is less than or equal to 0.5 but greater than or equal to 0.01, y is less than or equal to 0.75 but greater than or equal to 0.1, z is less than or equal to 0.082 but greater than or equal to 0.07, n is less than or equal to 6.5 but greater than or equal to 5.0, and (1-x-y) is less than or equal to 0.5 but greater than or equal to 0. R is Ca, Ba, Sr or one, two and three of Ce, Pr and Nd and Sm in lanthanide series exclusive of La. Compared with the conventional permanent magnetic ferrite, for the plumbite type yttrium permanent magnetic ferrite material, at the sintering temperature of 1150-1300 DEG C, the remanence Br value reaches 4.2-4.8kGs, the magnetic induction coercive force Hcb value reaches 4.2-5.2kOe, the intrinsic coercive force Hcj value reaches 4.5-6.0kOe, and the magnetic energy product value reaches 5.2-5.7MGOe. The plumbite type yttrium permanent magnetic ferrite material provided by the invention is high in remanence and intrinsic coercive force. When the sintered magnet becomes smaller and thinner, the high residual magnetic flux density is still maintained.

Description

technical field [0001] The invention relates to a magnetoplumbite-type permanent magnet ferrite material and a preparation method thereof, in particular to a novel magnetoplumbite-type yttrium-based permanent magnet ferrite material and a preparation method thereof. Background technique [0002] At present, sintered ferrite magnets and bonded permanent magnets are widely used in various fields of social life. For example, it is applied to the starter motor of motorcycles and automobiles, electric doors and windows, ABS, fans, etc. Ferrite permanent magnet materials are widely used in audio, video audio, office automation, audio and video recorder drive motors; in addition, ferrite permanent magnet materials can also be used in washing machines, microwave ovens, refrigerators and other household appliances and electric motors. Tools, etc.; more importantly, compared with other permanent magnet materials such as NdFeB permanent magnets, samarium cobalt permanent magnets and o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/40C04B35/622
Inventor 高尚刘先松金大利冯双久张战军黄风
Owner ANHUI UNIVERSITY
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