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High magnetic-energy-product M type calcium series permanent magnetic ferrite material and preparation method thereof

A technology of permanent magnet ferrite and high magnetic energy product, applied in the field of high magnetic energy product M-type calcium series permanent magnet ferrite material and its preparation field, can solve the problems of inability to prepare ferrite devices, difficult to achieve, etc. The effect of miniaturization, energy saving and collapse prevention

Inactive Publication Date: 2015-04-08
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 when the sintering temperature is ≤1150°C. device, and B r 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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  • High magnetic-energy-product M type calcium series permanent magnetic ferrite material and preparation method thereof
  • High magnetic-energy-product M type calcium series permanent magnetic ferrite material and preparation method thereof
  • High magnetic-energy-product M type calcium series permanent magnetic ferrite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The main raw material is La2 o 3 , CaCO 3 , SrCO 3 , Fe 2 o 3 and Co 3 o 4 , with R 1-x-y Ca x La y O· n Fe (12-z) / n co z / n o 3 Preparation of Sr 0.74 Ca 0.10 La 0.16 O·5.95Fe 1.97 co 0.08 o 3 .

[0032] According to Sr 0.74 Ca 0.10 La 0.16 O·5.95Fe 1.97 co 0.08 o 3 For stoichiometry, add accounted for Sr 0.74 Ca 0.10 La 0.16 O·5.95Fe 1.97 co 0.08 o 3 0.2 of the weight wt %Al 2 o 3 , 0.3 wt %Cr 2 o 3 , 0.5 wt %B 2 o 3 , 0.2 wt % SiO 2 . Add the above mixed powder and water into a ball mill and mix for 3 hours to obtain a mixed material with a suspended particle size of 0.1-2.0 μm. After drying, pre-calcine in air at 1290°C for 3 hours, and XRD analysis determines that the phase is Contains 95 wt % M phase, while its main grain size is 9 μm.

[0033] 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 obtained grinding powder (obtained by BET method) ...

Embodiment 2

[0039] The main raw material is La 2 o 3 , SrCO 3 , CaO, Fe 2 o 3 and Co 3 o 4 , with R 1-x-y Ca x La y O· n Fe (12-z) / n co z / n o 3 Preparation of Sr 0.73 Ca 0.09 La 0.18 O·6.0Fe 1.93 co 0.09 o 3 .

[0040] According to Sr 0.73 Ca 0.09 La 0.18 O·6.0Fe 1.93 co 0.09 o 3 For stoichiometry, add accounted for Sr 0.73 Ca 0.09 La 0.18 O·6.0Fe 1.93 co 0.09 o 3 0.6 of wt %Al 2 o 3 , 0.3 wt %Cr 2 o 3 , 0.4 wt %B 2 o 3 , 0.2 wt % SiO 2 . Mix in a ball mill for 5 hours to obtain a mixture 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 90 wt % M phase, and its main grain is 10 μm.

[0041] 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.

[0042] Carry out heat treatment in the air atmosphere, the te...

Embodiment 3

[0047] The main raw material is La 2 o 3 , CaCO 3 , SrCO 3 , CeO 2 , Fe 2 o 3 and Co 2 o 3 , with R 1-x-y Ca x La y O· n Fe (12-z) / n co z / n o 3 Preparation of Sr 0.3 Ce 0.410 Ca 0.13 La 0.16 O·6.1Fe 1.9 co 0.05 o 3 .

[0048] According to Sr 0.3 Ce 0.41 Ca 0.13 La 0.16 O·6.1Fe 1.9 co 0.05 o 3 For stoichiometry, add accounted for Sr 0.3 Ce 0.41 Ca 0.13 La 0.16 O·6.1Fe 1.9 co0.05 o 3 0.5 of wt %Al 2 o 3 , 0.3 wt %Cr 2 o 3 , 0.6 wt %B 2 o 3 , 0.3 wt % SiO 2 . Mix in a ball mill for 5 hours to obtain a mixed material with a suspended particle size of 1.5 μm. Pre-fired at 1200°C for 2 hours in an air atmosphere. XRD confirmed that the phase contained 95 wt % M phase, and its main grain is 10 μm.

[0049] 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 8m 2 / g.

[0050] Carry out heat ...

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Abstract

The invention discloses a high magnetic-energy-product M type calcium series permanent magnetic ferrite material and a preparation method thereof. The high magnetic-energy-product M type calcium series permanent magnetic ferrite material is a hexagonal crystal system, and the chemical structural formula is R1-x-yCaxLayO.nFe(12-z) / nCoz / nO3, wherein x is greater than or equal to 0.001 and smaller than or equal to 0.4, y is greater than or equal to 0.001 and smaller than or equal to 0.5, z is greater than or equal to 0.01 and smaller than or equal to 2.0, 1-x-y is greater than 0.2 and smaller than or equal to 0.998, n is greater than or equal to 5.0 and smaller than or equal to 6.5. R is Sr or adopts Sr as the main component, and also contains one, two or three of Ba, lanthanide series Ce, Pr, La, Nd and Sm. When R is Sr and Ba, the content of Sr and Ba is less than or equal to 0.998. In addition to high residual magnetism and intrinsic coercivity, the high magnetic-energy-product M type calcium series permanent magnetic ferrite material provided by the invention also has higher magnetic induction coercivity and maximum magnetic energy product, and is particularly in favor of miniaturization of permanent magnetic ferrite devices.

Description

technical field [0001] The present invention relates to a high magnetic energy product M-type calcium system permanent magnet ferrite material and a preparation method thereof, in particular to a novel high magnetic energy product M type calcium system permanent magnet ferrite material and a preparation method thereof. Background technique [0002] At present, sintered ferrite magnets and bonded permanent ferrites are widely used in various fields of social life. Such as: micro-motor manufacturing (automotive motor magnets, microelectronic rotors), household appliances (refrigerator magnetic door seals, disinfection cabinet magnetic door seals, microwave oven magnets), corrosion-resistant magnetic pump manufacturing, medical equipment, information and communication industries , aviation field, etc. What is especially important is that compared with other permanent magnet materials such as NdFeB permanent magnets and samarium cobalt permanent magnets, sintered permanent ferr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 刘先松高尚黄风金大利冯双久张战军
Owner ANHUI UNIVERSITY
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