JPH04154624A - Mn-zn ferrite - Google Patents
Mn-zn ferriteInfo
- Publication number
- JPH04154624A JPH04154624A JP2277256A JP27725690A JPH04154624A JP H04154624 A JPH04154624 A JP H04154624A JP 2277256 A JP2277256 A JP 2277256A JP 27725690 A JP27725690 A JP 27725690A JP H04154624 A JPH04154624 A JP H04154624A
- Authority
- JP
- Japan
- Prior art keywords
- ferrite
- cao
- grain boundary
- added
- less
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 22
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 8
- 229910052681 coesite Inorganic materials 0.000 abstract description 4
- 229910052906 cristobalite Inorganic materials 0.000 abstract description 4
- 239000000377 silicon dioxide Substances 0.000 abstract description 4
- 235000012239 silicon dioxide Nutrition 0.000 abstract description 4
- 229910052682 stishovite Inorganic materials 0.000 abstract description 4
- PBCFLUZVCVVTBY-UHFFFAOYSA-N tantalum pentoxide Inorganic materials O=[Ta](=O)O[Ta](=O)=O PBCFLUZVCVVTBY-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052905 tridymite Inorganic materials 0.000 abstract description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 abstract 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 239000013078 crystal Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 230000004907 flux Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 229910004077 HF-HNO3 Inorganic materials 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000029305 taxis Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Compounds Of Iron (AREA)
- Soft Magnetic Materials (AREA)
Abstract
Description
【発明の詳細な説明】
「産業上の利用分野Ｊ
この発明は、主に固定ディスク用、またはフレキシブル
ディスクやオーディオ用のヘッド材料に用いられる磁気
ヘッド用Ｍｎ−Ｚｎフェライトに関する。DETAILED DESCRIPTION OF THE INVENTION "Industrial Field of Application J This invention relates to Mn--Zn ferrite for magnetic heads, which is mainly used as a head material for fixed disks, flexible disks, and audio.
「従来の技術」
従来、固定ディスク用Ｍｎ−Ｚｎフェライト材料は、固
有抵抗を高くするために、Ｓ ｉＯを及びＣａＯを添加
物として加えることが行なわれている。"Prior Art" Conventionally, SiO and CaO have been added as additives to Mn--Zn ferrite materials for fixed disks in order to increase their specific resistance.
しかしながら、近年のヘッドのＭ密加工化に伴い、Ｍｎ
−Ｚｎフェライト素材からの脱粒が問題となり、結晶の
粒界強度の増加が要求されている。However, with the recent trend toward M-density machining of heads, Mn
- Grain shedding from Zn ferrite materials has become a problem, and an increase in the grain boundary strength of the crystal is required.
“発明か解決しようとする課題Ｊ
前記結晶の粒界強度の増加の要求に対し、ＳｉＯ２とＣ
ａＯの添加量を減少させる方法が提案されている。しか
しなから、この方法においては、固在抵抗か低下してし
まうという不具合か生じてしまう。“Problem to be solved by the invention J” In order to meet the requirement for increasing the grain boundary strength of the crystal, SiO2 and C
A method of reducing the amount of aO added has been proposed. However, this method has the problem of lowering the fixed resistance.
本発明は前記課題を解決するためになされたもので、固
有抵抗を低下させることなく、結晶の粒界強閲を高めた
Ｍｎ−Ｚｎフェライトを提供することを目的とする。The present invention was made to solve the above problems, and an object of the present invention is to provide an Mn--Zn ferrite that has enhanced crystal grain boundary reinforcement without lowering the specific resistance.
「課題を解決するｒコめの手段」
本発明は前記課題を解決するために、Ｆｅ２０ｓとＭｎ
ＯとＺｎＯを主組成とし、０．０１ｗｔ％以上、０．０
２ｗｔ％以下のＳｉ○、と、０．０３ｗｔ％以下のＣａ
Ｏと、０．０５ｗｔ％以上、０．１５ｗｔ％以下のＴａ
ｘｅｓが添加されてなるＭｎ Ｚｎフェライトとした
ものである。"Means for Solving the Problems" In order to solve the problems mentioned above, the present invention aims to solve the problems by using Fe20s and Mn.
Main composition is O and ZnO, 0.01wt% or more, 0.0
2wt% or less Si○, and 0.03wt% or less Ca
O and Ta of 0.05wt% or more and 0.15wt% or less
This is MnZn ferrite to which xes is added.
作用 」
本発明のＭｎ−Ｚｎフェライトにおいては、ＳｉＯ２と
ＣａＯとＴａｔＯｓを特定中添加することにより、粒界
強度を強くし、かつ固有抵抗を高くし几ものである。Effect: In the Mn-Zn ferrite of the present invention, by specifically adding SiO2, CaO, and TatOs, the grain boundary strength is strengthened and the specific resistance is increased.
尚、ＦｅｘＯｓの含有量は４５ａ＋ｏ１％以上、５５ｍ
ｏ１％以下、ＭｎＯの含有量は２０ｍｏＩ％以上、４０
ｍｏ１％以下、ＺｎＯの含有量は５ｍｏ１％以上、３０
ｍｏ１％以下である。In addition, the content of FexOs is 45a+o1% or more, 55m
o1% or less, MnO content is 20mol% or more, 40
mo 1% or less, ZnO content is 5 mo 1% or more, 30
The mo is 1% or less.
フェライト・中のＣａＯは、粒界部分に偏析し、また、
水に溶出し易い。このＣａＯを減らすことて、粒界部分
か化学的に安定になり、粒界強度を向上させることかで
きるのである。即ち、ＣａＯの添加量か０．０３ｗｔ％
を越えてしまうと、粒界強度が低下してしまう。CaO in ferrite segregates at grain boundaries, and
Easily eluted in water. By reducing this CaO, the grain boundary region becomes chemically stable and the grain boundary strength can be improved. That is, the amount of CaO added is 0.03 wt%.
If it exceeds , the grain boundary strength will decrease.
また、５ｉＯｙの添加量か０．０１ｗｔ％未満だと、固
有抵抗が小さくなり過ぎてしまい、０．０２ｗｔ％以上
だと粒界強度が低下してしまう。Further, if the amount of 5iOy added is less than 0.01 wt%, the specific resistance becomes too small, and if it is more than 0.02 wt%, the grain boundary strength will decrease.
Ｔａｘｅｓの添加は粒界強度を強くし、固有抵抗を高め
る効果がある。Addition of Taxes has the effect of strengthening grain boundary strength and increasing specific resistance.
「実施例−
５皿０．とＣａＯとＴａｔＯｓの添加量が第１表に示さ
れろ組成比のＭｎ−Ｚｎフェライトを製造した。Example 5 Mn--Zn ferrite having the composition ratio shown in Table 1 was manufactured with the added amounts of CaO and TatOs as shown in Table 1.
コＦ−ラ３々のＭｎＺｎフエライ−トの固有抵抗とＰＣ
Ｔ脱粒数とＨＦ ＨＮＯ３脱粒数を測定した。Specific resistance and PC of MnZn ferrite of Collar 3
The number of T pellets shed and the number of HF HNO3 pellets shed were measured.
ここて、ＰＣＴ脱拉数は、フェライトブロックを３μｌ
ラツプした後に、ブレツンヤークツカー試験機を用いて
１２０℃、２気圧で５時間処理しｎものである。Here, the number of PCT removal is 3 μl of ferrite block.
After wrapping, the sample was treated at 120° C. and 2 atm for 5 hours using a Bretzner-Jakezker tester.
まｒ二、ＨＦ ＨＮＯｓ脱粒数は、プレッシャークツ
カー試験よりも過酷な試験方法てあり、ＨＦＨＮ Ｏ３
のＩコ１溶液で４０ ｓｅｃ、エツチングしｆ二ときの
脱粒数の評価である。Second, the number of HF HNOs shedding is determined by a test method that is more severe than the pressure cutter test.
This is an evaluation of the number of grains shed after etching with a solution of I for 40 seconds and f2.
尚、比較例と乙て、Ｔａ２０５を添加していないしのを
併記した。In addition, the comparative example and the sample without Ta205 added are also shown.
以 下 余 白
第
表
比１１０．０１５
０２＋’０
第１表から、Ｔａｔ○５を添カロせずにＳｉ○、■添加
量を０．０１５ｗｔ％と従来′：′）〜１ｎ−Ｚｎフェ
ライトよりち減らした組成の比較例のＮｏ、８では、Ｐ
ＣＴ脱粒数か２０個１０．１＋ｎｍ”と多くなってしま
っている。Below Margin Table Ratio 110.015 02+'0 From Table 1, Si○ without adding Tat○5, ■ added amount of 0.015wt% and conventional ':')~1n-Zn ferrite. In comparative example No. 8 with a reduced composition, P
The number of CT grains shed was 20 pieces (10.1+nm), which was a large number.
また、比較例Ｎｏ ９と比較例Ｎｏ、１０では、ＣａＯ
を減少さ仕ろことてＰＣＴ脱＃ｉ、数をほぼ０にする二
とかできるが、固有抵抗値か１０（Ω・Ｈｌ）以下にな
りでしまっている。In addition, in Comparative Example No. 9 and Comparative Examples No. 10, CaO
It is possible to reduce the PCT number by reducing the number to almost 0, but the specific resistance value ends up being less than 10 (Ω·Hl).
乙かしなから、Ｔａ２０５を０．０５〜０．１００１Ｌ
％添加しでいろ未実施例のＭｎ−Ｚｎフェライトでは、
ＰＣＴ脱＃ｉ数か全てＯである。Ta205 is 0.05-0.1001L because it is not easy.
In the unexampled Mn-Zn ferrite with % addition,
All PCT removal #i numbers are O.
まｆ二、ＨＦ−ＨＮＯ３脱＃ｉ数ら、はとんどなく、粒
界強度か極めて高いことかわかる。It can be seen that the HF-HNO3 de#i number and the like indicate that the grain boundary strength is extremely high.
ざらに、ＣａＯの添加量が０．０２１ｙｔ％以下である
に乙かかわらす、国有抵抗をより高くすることり１てさ
ている。In general, even though the amount of CaO added is 0.021 yt% or less, it is possible to make the national resistance higher.
また、ＴａｔＯｓの添加は、磁気特性に関しても、残留
磁束’ｌ 、変Ｂ ｒを低く安定ざ仕る効果もある。In addition, the addition of TatOs also has the effect of keeping the residual magnetic flux 'l and the variation B r low and stable in terms of magnetic properties.
５らにまｆ二、Ｔａｐ’、の代わりに、ＺｒＯ＊を添加
Ｌ ｆ： Ｌ ｗＤ ：＊、ＨＦ ＨＮＯｔ脱粒散か
２０〜５０個１０．１ｍｍ’程変にまでしか減らすこと
ができなかつｆ二。5.Add ZrO* instead of Tap'. two.
ま１こ、Ｎｂ、○、をさらに添加してもかまね、ない。It doesn't matter if Nb and ○ are further added.
第１図と第２図は、Ｍｎ Ｚｎフェライトの表面を光
学顕微鏡を使用して写した写真である。第１図は本実施
例のＮｏ、３、第２図は比較例のＮ０８である。FIGS. 1 and 2 are photographs taken using an optical microscope of the surface of MnZn ferrite. FIG. 1 shows No. 3 of this example, and FIG. 2 shows No. 8 of the comparative example.
第１図から明らかなように、本実施例のＭｎ−Ｚｎフェ
ライトには脱粒は認められないが、比較例の第２図から
は、脱粒か粒界部分から発生していることがわかる。As is clear from FIG. 1, no grain shedding is observed in the Mn--Zn ferrite of this example, but from FIG. 2 of the comparative example, it can be seen that grain shedding occurs from grain boundary areas.
「発明の効果」
以上説明したように本発明のＭｎ−Ｚｎフェライトは、
Ｓ ｒ ＯｔとＣａＯとＴａｔＯｓを特定量添加したも
ので、固有抵抗を低下さけることなく、粒界強度を強く
したしのである。"Effects of the Invention" As explained above, the Mn-Zn ferrite of the present invention has
By adding specific amounts of S r Ot, CaO, and TatOs, the grain boundary strength was increased without reducing the specific resistance.
さらに、ＴａｔＯｓの添加：よ残留磁束密度を低く安定
させる効果らある。Furthermore, addition of TatOs has the effect of lowering and stabilizing the residual magnetic flux density.
第１図は実施例のＭｎ−Ｚｎフェライトの微細粒子構造
の光学顕微鏡写真、第２図は比較例のＭｎ−Ｚｎフェラ
イトの７１ａ７粒子構造の光学顕微鏡写真である。FIG. 1 is an optical microscope photograph of the fine grain structure of the Mn--Zn ferrite of the example, and FIG. 2 is an optical microscope photograph of the 71a7 grain structure of the Mn--Zn ferrite of the comparative example.
Claims (1)
０１ｗｔ％以上、０．０２ｗｔ％以下のＳｉＯ＿２と、
０．０３ｗｔ％以下のＣａＯと、０．０５ｗｔ％以上、
０．１５ｗｔ％以下のＴａ＿２Ｏ＿５が添加されてなる
Ｍｎ−Ｚｎフェライト。The main composition is Fe_2O_3, MnO and ZnO, and 0.
01wt% or more and 0.02wt% or less of SiO_2,
CaO of 0.03 wt% or less and 0.05 wt% or more,
Mn-Zn ferrite to which 0.15 wt% or less of Ta_2O_5 is added.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2277256A JP2788112B2 (en) | 1990-10-16 | 1990-10-16 | Mn-Zn ferrite for magnetic head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2277256A JP2788112B2 (en) | 1990-10-16 | 1990-10-16 | Mn-Zn ferrite for magnetic head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04154624A true JPH04154624A (en) | 1992-05-27 |
| JP2788112B2 JP2788112B2 (en) | 1998-08-20 |
Family
ID=17580994
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2277256A Expired - Fee Related JP2788112B2 (en) | 1990-10-16 | 1990-10-16 | Mn-Zn ferrite for magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2788112B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101858946A (en) * | 2010-05-07 | 2010-10-13 | 清华大学 | Method for testing single crystal boundary impact aging characteristic of zinc oxide pressure-sensitive resistor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03184307A (en) * | 1989-12-13 | 1991-08-12 | Hitachi Ferrite Ltd | High-frequency low-loss ferrite for power supply |
| JPH03212906A (en) * | 1990-01-18 | 1991-09-18 | Hitachi Ferrite Ltd | Manufacture of high frequency low loss ferrite for power supply |
| JPH03248404A (en) * | 1990-02-26 | 1991-11-06 | Hitachi Ferrite Ltd | Low-loss ferrite |
| JPH03248403A (en) * | 1990-02-26 | 1991-11-06 | Hitachi Ferrite Ltd | Low-loss ferrite |
-
1990
- 1990-10-16 JP JP2277256A patent/JP2788112B2/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03184307A (en) * | 1989-12-13 | 1991-08-12 | Hitachi Ferrite Ltd | High-frequency low-loss ferrite for power supply |
| JPH03212906A (en) * | 1990-01-18 | 1991-09-18 | Hitachi Ferrite Ltd | Manufacture of high frequency low loss ferrite for power supply |
| JPH03248404A (en) * | 1990-02-26 | 1991-11-06 | Hitachi Ferrite Ltd | Low-loss ferrite |
| JPH03248403A (en) * | 1990-02-26 | 1991-11-06 | Hitachi Ferrite Ltd | Low-loss ferrite |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101858946A (en) * | 2010-05-07 | 2010-10-13 | 清华大学 | Method for testing single crystal boundary impact aging characteristic of zinc oxide pressure-sensitive resistor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2788112B2 (en) | 1998-08-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |