CN105130413A - Ferrite powder and formed body prepared by same - Google Patents
Ferrite powder and formed body prepared by same Download PDFInfo
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- CN105130413A CN105130413A CN201510618202.7A CN201510618202A CN105130413A CN 105130413 A CN105130413 A CN 105130413A CN 201510618202 A CN201510618202 A CN 201510618202A CN 105130413 A CN105130413 A CN 105130413A
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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
The present invention relates to magnetic recording media field, particularly relate to a kind of ferrite powder and prepared formed body thereof.
Background technology
Bonded permanent magnet is permanent magnet material high polymer binder and ferromagnetic oxide powder are composited, not only there is the magnetic properties of permanent-magnet ferrite, and there is easy processing, the accurate many good characteristics of product size of macromolecular material, improve sintered magnet and the shortcoming such as not easily to process.
In recent years, along with the development of scientific and technological level, the equipment of various application bonded permanent magnet all requires that usability and reliability can significantly improve, and this just requires that bonded permanent magnet and the ferrite powder for the preparation of bonded permanent magnet have higher performance and better stability.
Magnetic recording media (such as: magnetic substance ticket, magnetic card etc.) is one of main application fields of bonded permanent magnet, in order to record more information on less volume, magnetic recording media needs to have higher magnetic recording density and good environmental stability.Present inventor finds: for being used as the bonded ferrite powder of magnetic recording media, (English full name is SwitchingFieldDistribution to SFD, be translated into switch yard distribution) less, coercive force homogenization degree is higher, and when forming magnetic recording media, the zone of transition between recorded bit is less, recording density is higher, the sensitivity of recording playback signal is better, to form the print-through of magnetic recording media less, overwrite performance is better; But in the prior art, SFD is substantially more than 0.32, and this makes the performance of prepared magnetic recording media be greatly limited.
Summary of the invention
For above-mentioned weak point of the prior art, the invention provides a kind of ferrite powder and prepared formed body thereof, SFD effectively can be controlled below 0.30, make that coercive force homogenization degree is higher, magnetic force homogeneity is better, magnetic property is stronger, thus when forming magnetic recording media, the zone of transition between recorded bit is less, recording density is higher, signal sensitivity is better, and the print-through of prepared magnetic recording media is less, and overwrite performance is better.
The object of the invention is to be achieved through the following technical solutions:
A kind of ferrite powder, in the particle size distribution of laser diffraction formula particles distribution instrument, the geometric standard deviation of size-grade distribution is 1.4 ~ 1.59, average volume particle diameter is 0.9 ~ 1.5 μm, screen underflow accumulation ratio be 10% particle diameter X10 be 0.35 ~ 0.55 μm, and the particle diameter X90 that screen underflow accumulation ratio is 90% is 1.5 ~ 2.5 μm.
Preferably, in the particle size distribution of laser diffraction formula particles distribution instrument, average volume particle diameter 1.0 ~ 1.2 μm.
A kind of formed body, this formed body is magnetic recording media, adopts ferrite powder described in technique scheme to make.
As seen from the above technical solution provided by the invention, the ferrite powder that the embodiment of the present invention provides is by the geometric standard deviation to ferrite powder size-grade distribution, average volume particle diameter, particle diameter X10, particle diameter X90 adjusts, thus SFD effectively can be controlled below 0.30, make coercive force homogenization degree higher, magnetic force homogeneity is better, magnetic property is stronger, thus when forming magnetic recording media, zone of transition between recorded bit is less, recording density is higher, signal sensitivity is better, the print-through of prepared magnetic recording media is less, overwrite performance is better.
Embodiment
Be clearly and completely described the technical scheme in the present invention below, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on embodiments of the invention, those of ordinary skill in the art, not paying the every other embodiment obtained under creative work prerequisite, belong to protection scope of the present invention.
Respectively ferrite powder provided by the present invention and prepared formed body thereof are described in detail below.
A kind of ferrite powder, its particular content comprises: in the particle size distribution of laser diffraction formula particles distribution instrument, the geometric standard deviation of size-grade distribution is 1.4 ~ 1.59, average volume particle diameter is 0.9 ~ 1.5 μm, screen underflow accumulation ratio be 10% particle diameter X10 be 0.35 ~ 0.55 μm, and the particle diameter X90 that screen underflow accumulation ratio is 90% is 1.5 ~ 2.5 μm.
Wherein, the specific embodiments of this ferrite powder can comprise:
(1) formula of computational geometry standard deviation is: geometric standard deviation=(X84/X16) P
1/2p, wherein, X84 is the accumulation ratio of screen underflow particle diameter when by volume standard is 84%, and X16 is the accumulation ratio of screen underflow particle diameter when by volume standard is 16%.In the prior art, those skilled in the art think that geometric standard deviation for the preparation of its size-grade distribution of ferrite powder of magnetic recording media is preferably between 1.6 ~ 2.2 always, but present inventor finds, when the geometric standard deviation of the size-grade distribution of ferrite powder is in 1.6 ~ 2.2 this interval, SFD value is larger, the poor-performing of obtained magnetic recording media, thus ferrite powder provided by the present invention is in the particle size distribution of laser diffraction formula particles distribution instrument, and the geometric standard deviation of size-grade distribution is between 1.4 ~ 1.59; If this geometric standard deviation is greater than 1.59, then the SFD numerical value of this ferrite powder is comparatively large, coercivity profile a wider range, and prepared magnetic recording media sensitivity is lower, and overwrite performance is poor, thus not preferred; And this geometric standard deviation will be controlled to and be less than 1.4, current state of the art is difficult to accomplish, namely allows to accomplish, so manufacturing process also can be quite complicated, and cost is very high, thus not preferred.
(2) average volume particle diameter is the particle diameter obtained divided by whole granule number by the volume summation of whole particle.Ferrite powder provided by the present invention is in the particle size distribution of laser diffraction formula particles distribution instrument, and average volume particle diameter is 0.9 ~ 1.5 μm; If average volume particle diameter is greater than 1.5 μm, then the particle size of this ferrite powder increases, and the total number of particles of unit surface arrangement reduces, and SFD numerical value becomes large, and the magnetic recording density of prepared magnetic recording media can decline to a great extent, thus not preferred; If average volume particle diameter is less than 0.9 μm, then the dispersiveness of this ferrite powder can decline to a great extent, thus not preferred.In actual applications, average volume particle diameter can be 0.9 ~ 1.5 μm, but is preferably 1.0 ~ 1.2 μm.
(3) X10 is the accumulation ratio of screen underflow particle diameter when by volume standard is 10%, and X90 is the accumulation ratio of screen underflow particle diameter when by volume standard is 90%.Ferrite powder provided by the present invention in the particle size distribution of laser diffraction formula particles distribution instrument, screen underflow accumulation ratio be 10% particle diameter X10 be 0.35 ~ 0.55 μm, and the particle diameter X90 that screen underflow accumulation ratio is 90% is 1.5 ~ 2.5 μm; If particle diameter X10 is less than 0.35 μm and particle diameter X90 is greater than 2.5 μm, then the SFD numerical value of this ferrite powder is comparatively large, coercivity profile a wider range, and prepared magnetic recording media sensitivity is lower, and overwrite performance is poor, thus not preferred; And particle diameter X10 is controlled to be greater than 0.55 μm and particle diameter X90 is controlled to and be less than 1.5 μm, preparation difficulty is very large, is not easy to realize, and cost is very high, thus not preferred; If particle diameter X10 is less than 0.35 and particle diameter X90 is less than 1.5, mean particle size can be caused less than normal, thus not preferred; If particle diameter X10 is greater than 0.55 and particle diameter X90 is greater than 2.5, mean particle size can be caused bigger than normal, thus not preferred.
(4) coercive force of ferrite powder provided by the present invention is preferably 2500 ~ 3000Oe, this not only can make prepared magnetic recording media have less print-through, sensitivity preferably and overwrite performance, and preparation technology is relatively simple, production efficiency is higher.
(5) in the present invention, the geometric standard deviation of ferrite powder, average volume particle diameter, X10, X90 adopt HELOS & RODOS laser diffraction formula particles distribution instrument to measure.Ferrite powder foot couple moiety provided by the present invention is not particularly limited, such as: can be Sr based ferrite powder, also can be Ba based ferrite powder, can also be the ferrite powder containing elements such as Bi, Ti, Zr, Mn; No matter prepare the ferrite powder of which kind of composition, as long as its size-grade distribution and coercive force meet the requirement in technique scheme, SFD all can be made effectively to control below 0.30, thus make that coercive force homogenization degree is higher, magnetic force homogeneity is better, magnetic property is stronger.
Particularly, ferrite powder provided by the present invention can adopt following preparation method: raw material powder and additive are prepared burden in specific proportions, and adopts high-speed mixer to carry out dry type mixing, thus obtains mixing material; Then, with 950 ~ 1150 DEG C, pre-burned is carried out to mixing material in an atmosphere, then carry out successively pulverizing, wash, drying and processing, at 600 ~ 900 DEG C, carry out annealing thermal treatment subsequently, adopt high speed disintegrator to disperse after cooling, the ferrite powder that the embodiment of the present invention provides can be obtained; Further, the obtained ferrite powder with above-mentioned size-grade distribution and average volume particle diameter can adopt various method of the prior art, such as: the two or more particle diameters ferrite powder different with size-grade distribution can be mixed in specific proportions, to obtain above-mentioned size-grade distribution and the ferrite powder of average volume particle diameter; Also pulverizing, classification, screening operation can be utilized to modulate ferrite powder, to obtain above-mentioned size-grade distribution and the ferrite powder of average volume particle diameter.
In addition, present invention also offers a kind of magnetic recording media, the ferrite powder that have employed described in technique scheme is made.This magnetic recording media can be magnetic card, magnetic ticket, tape etc.In actual applications, magnetic recording media provided by the present invention, the main component of its ferromagnetic oxide powder adopted is preferably MFeR
12rOR
19r, M are wherein at least one in Ba element or Sr element, and can also add the elements such as Bi, Ti, Zr, Mn in this ferromagnetic oxide powder.
As can be seen here, SFD can effectively control below 0.30 by the embodiment of the present invention, make that coercive force homogenization degree is higher, magnetic force homogeneity is better, magnetic property is stronger, thus when forming magnetic recording media, zone of transition between recorded bit is less, and recording density is higher, and signal sensitivity is better, the print-through of prepared magnetic recording media is less, and overwrite performance is better.
In order to the technique effect more clearly showing technical scheme provided by the present invention and produce, the ferrite powder provided the embodiment of the present invention with a few specific embodiment below and prepared formed body thereof are described in detail.
Embodiment 1
Get the Powdered FeR of 2327g
2rOR
3the BaCOR of R and 500g
3r (mol ratio of Fe and Ba is 2Fe:Ba=5.75:1) as main raw material, and adds the BiR of 14.1g
2rOR
3r (BiR
2rOR
3the consumption of R is relative to the 0.5wt% of main raw material gross weight) as addition material, then adopt high-speed mixer to carry out dry type mixing in 5 minutes, obtain mixing material.Mixing material is mixed with water and carries out granulation, and the granules obtained is carried out the pre-burned of 2 hours in an atmosphere with 1100 DEG C.Coarse breaking is carried out to the thing of firing obtained, then puts into wet-type ball mill fine grinding 2 hours, then carry out successively washing, filter, dry.The dry thing obtained is carried out in an atmosphere the anneal of 1 hour with 830 DEG C, disperse with high speed disintegrator after naturally cooling, and adopt classification, screening operation adjusts the size distribution of powder and average volume particle diameter, thus the magnetic recording media ferromagnetic oxide powder that the obtained embodiment of the present invention provides, its geometric standard deviation, average volume particle diameter, particle diameter X10, particle diameter X90 and magnetic property can be as shown in table 1.
Embodiment 2 ~ 4
Compared with embodiment 1, the preparation method of embodiment 2 ~ 4 is substantially the same manner as Example 1, its difference is that different embodiments adjusts the kind of proportioning raw materials, additive and addition, pre-burned temperature and anneal temperature, the adjustment of size distribution and average volume particle diameter is changed to some extent, thus having obtained three kinds of different magnetic recording media ferromagnetic oxide powders, respective geometric standard deviation, average volume particle diameter, particle diameter X10, particle diameter X90 and magnetic property all can be as shown in table 1.
Comparative example 1 ~ 5
Comparative example 1 ~ 5 is the ferromagnetic oxide powders of the five kinds of different-grain diameter distributions conventionally obtained, all not to the size distribution of ferromagnetic oxide powder and the adjustment of average volume particle diameter, respective geometric standard deviation, average volume particle diameter, particle diameter X10, particle diameter X90 and magnetic property all can be as shown in table 1.
Table 1:
Can be found out by embodiment 1 ~ 4, comparative example 1 ~ 5 and table 1: the ferrite powder prepared by embodiment 1 ~ 4 is adjusted by the geometric standard deviation to size-grade distribution, average volume particle diameter, X10, X90, SFD effectively can be controlled below 0.30, and comparative example 1 ~ 5 is minimum SFD can only be reduced to 0.30.As can be seen here, the ferrite powder particles size distribution ranges that the embodiment of the present invention provides is less, SFD is less, coercive force homogenization degree is higher, therefore after making the magnetic recording medias such as magnetic card, magnetic ticket, tape, zone of transition between recorded bit is less, recording density is higher, sensitivity is better, print-through is less, and overwrite performance is better.
In sum, SFD can effectively control below 0.30 by the embodiment of the present invention, make that coercive force homogenization degree is higher, magnetic force homogeneity is better, magnetic property is stronger, thus when forming magnetic recording media, zone of transition between recorded bit is less, and recording density is higher, and signal sensitivity is better, the print-through of prepared magnetic recording media is less, and overwrite performance is better.
The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.
Claims (3)
1. a ferrite powder, it is characterized in that, in the particle size distribution of laser diffraction formula particles distribution instrument, the geometric standard deviation of size-grade distribution is 1.4 ~ 1.59, average volume particle diameter is 0.9 ~ 1.5 μm, screen underflow accumulation ratio be 10% particle diameter X10 be 0.35 ~ 0.55 μm, and the particle diameter X90 that screen underflow accumulation ratio is 90% is 1.5 ~ 2.5 μm.
2. ferrite powder according to claim 1, is characterized in that, in the particle size distribution of laser diffraction formula particles distribution instrument, average volume particle diameter is 1.0 ~ 1.2 μm.
3. a formed body, is characterized in that, this formed body is magnetic recording media, and the ferrite powder that have employed according to any one of the claims 1 to 2 is made.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510618202.7A CN105130413A (en) | 2015-09-24 | 2015-09-24 | Ferrite powder and formed body prepared by same |
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| CN201510618202.7A CN105130413A (en) | 2015-09-24 | 2015-09-24 | Ferrite powder and formed body prepared by same |
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| CN201510618202.7A Pending CN105130413A (en) | 2015-09-24 | 2015-09-24 | Ferrite powder and formed body prepared by same |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11521769B2 (en) | 2019-03-27 | 2022-12-06 | Tdk Corporation | Ferrite sintered magnet and rotary electrical machine comprising the same |
| US11532413B2 (en) | 2019-03-27 | 2022-12-20 | Tdk Corporation | Ferrite sintered magnet and rotary electrical machine comprising the same |
| US11610705B2 (en) | 2019-03-27 | 2023-03-21 | Tdk Corporation | Ferrite sintered magnet and rotating electric machine comprising the same |
| US11626222B2 (en) | 2019-10-18 | 2023-04-11 | Tdk Corporation | Ferrite sintered magnet and rotary electrical machine comprising the same |
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|---|---|---|---|---|
| CN1239578A (en) * | 1997-09-19 | 1999-12-22 | Tdk株式会社 | Magnet powder, sintered magnet, method of mfg. these materials, bonded magnet, motor, and magnetic recording medium |
| CN101345110A (en) * | 2007-03-30 | 2009-01-14 | 户田工业株式会社 | Ferrite particles for bonded magnet resin composition for bonded magnet and molded products using the same |
| EP2204352A1 (en) * | 2007-09-28 | 2010-07-07 | DOWA Electronics Materials Co., Ltd. | Ferrite powder for bonded magnets, process for the production of the powder, and bonded magnets made by using the same |
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2015
- 2015-09-24 CN CN201510618202.7A patent/CN105130413A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1239578A (en) * | 1997-09-19 | 1999-12-22 | Tdk株式会社 | Magnet powder, sintered magnet, method of mfg. these materials, bonded magnet, motor, and magnetic recording medium |
| CN101345110A (en) * | 2007-03-30 | 2009-01-14 | 户田工业株式会社 | Ferrite particles for bonded magnet resin composition for bonded magnet and molded products using the same |
| EP2204352A1 (en) * | 2007-09-28 | 2010-07-07 | DOWA Electronics Materials Co., Ltd. | Ferrite powder for bonded magnets, process for the production of the powder, and bonded magnets made by using the same |
Non-Patent Citations (1)
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| 尹有祥等: "铁的氧化物和铁氧体磁性材料", 《磁性材料及器件》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11521769B2 (en) | 2019-03-27 | 2022-12-06 | Tdk Corporation | Ferrite sintered magnet and rotary electrical machine comprising the same |
| US11532413B2 (en) | 2019-03-27 | 2022-12-20 | Tdk Corporation | Ferrite sintered magnet and rotary electrical machine comprising the same |
| US11610705B2 (en) | 2019-03-27 | 2023-03-21 | Tdk Corporation | Ferrite sintered magnet and rotating electric machine comprising the same |
| US11626222B2 (en) | 2019-10-18 | 2023-04-11 | Tdk Corporation | Ferrite sintered magnet and rotary electrical machine comprising the same |
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Application publication date: 20151209 |