Ferrite powder and formed body prepared by same

A technology of ferrite and molded body, which is applied in the field of ferrite powder and its prepared molded body, can solve the problems of magnetic recording medium performance limitations, and achieve high uniformity of coercive force, strong magnetic properties, and transition small area effect

Inactive Publication Date: 2015-12-09
BGRIMM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inventors of the present application have found that: for bonded ferrite powder used as a magnetic recording medium, the smaller the SFD (English full name is Switching Field Distribution, translated as switching field distribution), the higher the coercive force uniformity, In the case of magnetic recording media, the smaller the transition area between the recording bits, the higher the recording density, the better the sensitivity of the recording and playback signal, the smaller the copy effect of the formed magnetic recording medium, and the better the rewriting performance; but in the prior art , the SFD is basically above 0.32, which greatly limits the performance of the prepared magnetic recording media

Method used

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  • Ferrite powder and formed body prepared by same
  • Ferrite powder and formed body prepared by same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take 2327g of powdered FeR 2 ROR 3 R and 500 g of BaCOR 3 R (the molar ratio of Fe to Ba is 2Fe:Ba=5.75:1) is used as the main raw material, and 14.1g of BiR is added 2 ROR 3 R(BiR 2 ROR 3The amount of R is 0.5wt% relative to the total weight of the main raw material) as an additive, and then a high-speed mixer is used for 5 minutes of dry mixing to obtain a mixed material. The kneaded material was mixed with water and granulated, and the obtained granulated material was calcined at 1100° C. for 2 hours in the air. The obtained burnt product was coarsely crushed, then finely ground in a wet ball mill for 2 hours, washed with water, filtered and dried in sequence. Anneal the obtained dry product at 830°C for 1 hour in the atmosphere, disperse it with a high-speed pulverizer after natural cooling, and adjust the particle size distribution and average volume particle size of the powder by grading and sieving operations. Thus, the ferrite magnetic powder for magnetic...

Embodiment 2～4

[0027] Compared with Example 1, the preparation methods of Examples 2 to 4 are basically the same as Example 1, and the difference is that different examples carry out the raw material ratio, the type and addition amount of additives, the pre-firing temperature and the annealing temperature. In order to adjust, the particle size distribution and the average volume particle size adjustment were changed, thus three different ferrite magnetic powders for magnetic recording media were prepared, and the respective geometric standard deviation, average volume particle size, particle size X10, particle size The diameter X90 and the magnetic properties can be shown in Table 1.

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Abstract

The invention discloses ferrite powder and a formed body prepared by same. In the granularity distribution determination of a laser diffraction granularity distribution instrument, the geometric standard deviation of the granularity distribution is 1.4 to 1.59, the average volumetric particle size is 0.9 to 1.5 micrometers, the particle size X10 of screen underflow with an accumulated ratio of 10 percent is 0.35 to 0.55 micrometers, and the particle size X90 of the screen underflow with accumulated ratio of 90 percent is 1.5 to 2.5 micrometers. By adopting the ferrite powder, the SFD can be effectively controlled to be less than or equal to 0.30, so that the homogenization degree of the coercivity is higher, the magnetic uniformity is better, the magnetic performance is higher, when a magnetic recording medium is formed, a transitional area between two recording sites is smaller, the recording density is higher, the signal sensitivity is better, the print-through effect of the magnetic recording medium is smaller, and the rewriting performance is better.

Description

technical field [0001] The invention relates to the field of magnetic recording media, in particular to a ferrite powder and a molded body prepared therefrom. Background technique [0002] Bonded magnet is a permanent magnet material composed of polymer binder and ferrite magnetic powder. It not only has the magnetic properties of permanent magnet ferrite, but also has many excellent characteristics such as easy processing and accurate product size of polymer materials. The shortcomings of sintered magnets are not easy to process. [0003] In recent years, with the development of science and technology level, all kinds of equipment using bonded magnets require that the usability and reliability can be greatly improved, which requires bonded magnets and ferrite powder used to prepare bonded magnets to have higher performance and better stability. [0004] Magnetic recording media (such as magnetic tickets, magnetic cards, etc.) are one of the main application fields of bond...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26
Inventor 韩超廖有良高磊王倩刘荣明李炳山胡国辉王永齐贾立颖
Owner BGRIMM TECH CO LTD
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