Ferromagnetic oxide powder for magnetic recording and preparation method thereof

A technology for ferrite magnetism and magnetic recording, which is applied to the preparation of ferrite magnetic powder for magnetic recording, and the field of ferrite magnetic powder for magnetic recording, which can solve the problem of unfavorable magnetic card hysteresis loop rectangularity and difficulty in preparing ferrite. Insufficient reaction of bulk magnetic powder and ferrite to achieve the effect of fine particle size, narrow particle size distribution and lower pre-sintering temperature

Inactive Publication Date: 2010-02-24
BGRIMM TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But too low pre-firing temperature will lead to insufficient ferrite reaction, the existence of non-M phase, and reduce the σs of the magnetic powder; after a long time of fine grinding, the particle size distribution of the magnetic powder will

Method used

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  • Ferromagnetic oxide powder for magnetic recording and preparation method thereof

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Comparison scheme
Effect test

Embodiment 1

[0036] 500g of iron red with a purity of 98.5%, 111g of barium carbonate with a purity of 98.8%, and 1.8g of Bi 2 o 3 , 0.5g nano-SiO 2 and 0.5g nano-Al 2 o 3 , using a vibration mill to mix to obtain a mixture;

[0037] After the mixture is pelletized with water, it is pre-sintered at 1050°C for 2 hours in an electric furnace;

[0038] After cooling, use a dry ball mill for coarse crushing to an average particle size of 2.8 μm, then use a ball mill for wet fine grinding for 1-4 hours to an average particle size of 0.96 μm, dry and anneal at 850°C for 30 minutes, and finally use a high-speed Disperse with a pulverizer to obtain ferrite magnetic powder.

[0039] The average particle size of the magnetic powder is detected by the WLP-202 model average particle size tester; the particle size distribution test is carried out by the HELOS / RODOS model laser particle size distribution tester; the magnetic performance test is carried out by the VSM method. figure 1 The XRD patte...

Embodiment 2

[0041] 500g of iron red with a purity of 98.5%, 83g of strontium carbonate with a purity of 99%, and 1.7g of Bi 2 o 3, 0.5g nano-SiO 2 and 0.5g nano-Al 2 o 3 , using a vibration mill to mix to obtain a mixture;

[0042] After the mixture is pelletized with water, it is pre-sintered at 1080°C for 2 hours in an electric furnace;

[0043] After cooling, use a dry ball mill for coarse crushing to an average particle size of 2.8 μm, then use a ball mill for wet fine grinding for 1-4 hours to an average particle size of 0.97 μm, dry and anneal at 850°C for 30 minutes, and finally use a high-speed Disperse with a pulverizer to obtain ferrite magnetic powder.

[0044] The average particle size of the magnetic powder is detected by the WLP-202 model average particle size tester; the particle size distribution test is carried out by the HELOS / RODOS model laser particle size distribution tester; the magnetic performance test is carried out by the VSM method.

Embodiment 3

[0046] 500g of iron red with a purity of 98.5%, 132g of barium carbonate with a purity of 98.5%, and 1.8g of Bi 2 o 3 , 0.5g nano-SiO 2 and 0.5g nano-Al 2 o 3 , using a vibration mill to mix to obtain a mixture;

[0047] After the mixture is pelletized with water, it is pre-sintered at 1070°C for 2 hours in an electric furnace;

[0048] After cooling, use a dry ball mill for coarse crushing to an average particle size of 2.6 μm, then use a ball mill for wet fine grinding for 1-4 hours to an average particle size of 0.95 μm, dry and anneal at 850°C for 30 minutes, and finally use a high-speed Disperse with a pulverizer to obtain ferrite magnetic powder.

[0049] The average particle size of the magnetic powder is detected by the WLP-202 model average particle size tester; the particle size distribution test is carried out by the HELOS / RODOS model laser particle size distribution tester; the magnetic performance test is carried out by the VSM method.

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Abstract

The invention relates to a ferromagnetic oxide powder for magnetic recording and a preparation method thereof. The invention firstly provides the ferromagnetic oxide powder for magnetic recording, which comprises the raw materials: ferric oxide and compound of strontium or barium; and based on the total weight of the ferric oxide and the compound of strontium or barium, the ferromagnetic oxide powder also comprises the components by weight percent: 0.01-2.0wt% of bismuth trioxide, 0-0.2wt% of nano silicon dioxide and 0-0.2wt% of nano aluminium oxide or chromium sesquioxide, and the mole ratiobetween ferric element and strontium or barium element is 10-12. The invention also provides the preparation method of the ferromagnetic oxide powder, comprising the steps of dosing, mixing, preburning, crude crushing, fine grinding, drying, annealing and smashing. The ferromagnetic oxide powder has little grain fineness, high coercive force and good dispersity, can reach narrower grain fineness distribution, meets the requirement of being taken as a magnetic recording medium, and is suitable for making magnetic recording mediums such as a magnetic card, a magnetic ticket, etc.

Description

technical field [0001] The invention relates to a ferrite magnetic powder for magnetic recording, in particular to a ferrite magnetic powder with small particle size and high specific saturation magnetization, which is suitable for preparing magnetic cards, magnetic tickets, magnetic tapes and the like. The invention also relates to a preparation method of the ferrite magnetic powder for magnetic recording. Background technique [0002] Magnetic recording media not only require high recording density, but also require good environmental stability and good hysteresis loop squareness, which requires magnetic recording media to have fine particles, high coercive force, good dispersion and narrow characteristics such as particle size distribution. Ferrite magnetic powder is especially suitable for preparing magnetic recording media such as magnetic cards and magnetic tickets because of its high coercive force. [0003] Generally, the ferrite magnetic powder used in magnetic re...

Claims

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Application Information

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IPC IPC(8): H01F1/36C04B35/26C04B35/64
Inventor 廖有良连江滨吕宝顺要继忠胡国辉张威峰王倩
Owner BGRIMM TECH CO LTD
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