Calcium permanent magnetic ferrite material and preparation method thereof

A permanent magnet ferrite and mixing technology, applied in the field of ferrite materials and their preparation, can solve the problems of preparing ferrite devices, Br is difficult to reach 4200-4700Gs, difficult to reach 4500-6200kOe, etc. Sintering temperature, avoiding the difficulty of forming magnetic parts, and the effect of high residual magnetic flux density

Active Publication Date: 2010-07-28
安徽名杰磁业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The above two types are generally called Ba or Sr ferrite; or partial ion substitution (replacement) strontium ferrite, barium ferrite, neither can

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The main raw material is La 2 o 3 , CaCO 3 、Sm 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 Ca x La y · nFe 2-z co z / n o 3

[0030] When x=0.24, y=0.60, R 1 For Sr=0.10, R 2 When Sm=0.06, z=0.27, n=5.7,

[0031] According to the above molar ratio, the raw material powder was mixed in water for 3 hours in a ball mill to obtain a mixture of suspended particles with a particle size of 0.1-2.0 μm. It was pre-calcined at 1290 ° C for 3 hours in an air atmosphere. XRD confirmed that the phase often contained 90wt% M phase, and its main grains are 9μm.

[0032] 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 7m 2 / g.

[0033] Heat treatment in an air atmosphere at a tem...

Embodiment 2

[0038] The main raw material is La 2 o 3 , CaCO 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 Ca x La y · nFe 2-z co z / n o 3

[0040] When x=0.38, y=0.54, 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 confirmed that the phase usually contains 83% M phase, and its main grain 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 under air atmosphere, temperature is 800 ℃, keep warm for 3 hours.

[0044] Add 1%wtCaCO t...

Embodiment 3

[0048] The main raw material is La 2 o 3 , CaCO 3 ,Nd 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:

[0049] R 1-x-y Ca x La y · nFe 2-z co z / n o 3

[0050] x=0.48, y=0.43, R 1 for Sr=0.05, R 2 When Nd=0.04, z=0.33, n=5.9,

[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 1300°C for 2 hours in air atmosphere. XRD confirms that the phase usually contains 95% M phase, and its main 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 air atmosphere, temperature is 900 ℃, kee...

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Abstract

The invention discloses a calcium permanent magnetic ferrite material and a preparation method thereof. The calcium permanent magnetic ferrite material belongs to the hexagonal crystal system and has the following chemical structural formula: R1-x-yCaxLay.nFe2-zCoz/nO3, wherein 0.01<=x<=0.4, 0.1<=y<=0.75, 0.07<=z<=0.82, 5.0<=n<=6.5, 0<=1-x-y<=0.5; R is one or two or three of Ba, Sr and total 16 lanthanide series chemical elements not containing La; and when R is Ba and Sr, the content of Ba and Sr is smaller than 0.2. Compared with the traditional permanent magnetic ferrite, the permanent magnetic ferrite material provided by the invention only contains a small quantity of Ba and Sr; and under the temperature of 1150 DEG C or lower sintering temperature, the value of residual magnetism Br can reach 4200-4700Gs, and the value of intrinsic coercivity HJC reaches 4500-6200kOe. The calcium permanent magnetic ferrite of the invention has high residual magnetism and intrinsic coercivity, and can maintain high residual magnetic flux density after a sintered type magnet is diminished and thinned.

Description

technical field [0001] The invention relates to a ferrite material and a preparation method thereof, in particular to a calcium permanent magnet ferrite material and a preparation method thereof. Background technique [0002] At present, the application of sintered ferrite magnets and bonded magnets involves various fields of social life. It can be used in motorcycles and automobiles, such as starter motors, electric doors and windows, ABS, fans, etc.; ferrite permanent magnet materials can also be used in audio, video audio, office automation, audio and video recorders, etc. drive motors; in addition, iron Oxygen permanent magnet materials can also be used in washing machines, microwave ovens, refrigerators and other household appliances and electric tools. [0003] The traditional types of ferrite materials are as follows: [0004] The first type: Ba or Sr ferrite with hexagonal structure Here we use AFe 12 o 19 express. In the A position it is usually Ba or Sr, or bo...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622
Inventor 刘先松朱德如尹萍邱士星周丹胡锋贾道宁王鹏鹏程春浩阮征
Owner 安徽名杰磁业科技有限公司
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