JPH04321522A - Production of manganese-zinc-based ferrite - Google Patents
Production of manganese-zinc-based ferriteInfo
- Publication number
- JPH04321522A JPH04321522A JP3115291A JP11529191A JPH04321522A JP H04321522 A JPH04321522 A JP H04321522A JP 3115291 A JP3115291 A JP 3115291A JP 11529191 A JP11529191 A JP 11529191A JP H04321522 A JPH04321522 A JP H04321522A
- Authority
- JP
- Japan
- Prior art keywords
- manganese
- zinc
- temperature
- magnetic permeability
- ferrite
- 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.)
- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 229910000859 α-Fe Inorganic materials 0.000 title abstract description 11
- WJZHMLNIAZSFDO-UHFFFAOYSA-N manganese zinc Chemical compound [Mn].[Zn] WJZHMLNIAZSFDO-UHFFFAOYSA-N 0.000 title description 2
- JKQOBWVOAYFWKG-UHFFFAOYSA-N molybdenum trioxide Chemical compound O=[Mo](=O)=O JKQOBWVOAYFWKG-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000000463 material Substances 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 239000002994 raw material Substances 0.000 claims abstract 2
- 238000010304 firing Methods 0.000 claims description 15
- 229910001289 Manganese-zinc ferrite Inorganic materials 0.000 claims description 11
- JIYIUPFAJUGHNL-UHFFFAOYSA-N [O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[Mn++].[Mn++].[Mn++].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Zn++].[Zn++] Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[Mn++].[Mn++].[Mn++].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Zn++].[Zn++] JIYIUPFAJUGHNL-UHFFFAOYSA-N 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 5
- 230000035699 permeability Effects 0.000 abstract description 17
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 11
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 6
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 4
- 239000011701 zinc Substances 0.000 description 4
- 229910052725 zinc Inorganic materials 0.000 description 4
- 239000000696 magnetic material Substances 0.000 description 3
- 239000011787 zinc oxide Substances 0.000 description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910017344 Fe2 O3 Inorganic materials 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000000859 sublimation Methods 0.000 description 1
- 230000008022 sublimation Effects 0.000 description 1
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、マンガン−亜鉛系フェ
ライトの製造方法に関し、更に詳しく述べると、少量の
三酸化モリブデンを添加するとともに適切な昇温速度を
選択して大気中で急速昇温することにより、短時間焼成
で高透磁率特性を発現する酸化物磁性材料の製造方法に
関するものである。[Industrial Application Field] The present invention relates to a method for manufacturing manganese-zinc ferrite. More specifically, the present invention relates to a method for producing manganese-zinc ferrite, and more specifically, a method for rapidly raising the temperature in the atmosphere by adding a small amount of molybdenum trioxide and selecting an appropriate heating rate. The present invention relates to a method for producing an oxide magnetic material that exhibits high magnetic permeability characteristics in a short firing time.
【０００２】0002
【従来の技術】フェライトの透磁率を高くするためには
、結晶の粒径を大きくすれば良いとされているが、その
ためには高温長時間の焼結が必要となる。しかしマンガ
ン−亜鉛系フェライトのように亜鉛を含む場合には、あ
まり長時間高温状態においておくと、その表面から酸化
亜鉛が蒸発するため逆に透磁率が低下する。そこで従来
技術によれば、焼成時にフェライト材料に同種のフェラ
イト粉体を被せるなど何らかのシールを施し、亜鉛が蒸
発しないように工夫した状態で高温長時間焼成を行って
いた。2. Description of the Related Art In order to increase the magnetic permeability of ferrite, it is said that the grain size of the crystals can be increased, but this requires sintering at high temperatures and for a long time. However, if the material contains zinc, such as manganese-zinc ferrite, if it is left in a high temperature state for too long, the zinc oxide will evaporate from the surface, resulting in a decrease in magnetic permeability. Therefore, according to the prior art, during firing, the ferrite material was covered with the same type of ferrite powder or some other type of seal, and the ferrite material was fired for a long time at a high temperature under conditions designed to prevent the zinc from evaporating.
【０００３】しかし、この方法では数十時間といった長
時間焼成を行うため焼成コストが増大し、また焼成後に
シールを除去する作業が必要なため生産コストが高くな
り、全体として量産化には不向きである。[0003] However, this method requires firing for a long period of time, such as several tens of hours, which increases the firing cost, and the process of removing the seal after firing increases the production cost, making it unsuitable for mass production as a whole. be.
【０００４】そこで、これらの欠点を解消できるものと
して、少量の三酸化モリブデンを添加するとともに、低
酸素濃度（０．０１〜５％）で急速昇温（１１００℃以
上での昇温速度が２００〜６００℃／時）を行い焼結さ
せるマンガン−亜鉛系フェライトの製造方法が開発され
た（特開昭６１−９１９０８号公報参照）。[0004] Therefore, as a solution to these drawbacks, a small amount of molybdenum trioxide is added and the temperature is rapidly raised at a low oxygen concentration (0.01 to 5%) (the heating rate at 1100°C or higher is 200°C). A method for producing manganese-zinc ferrite has been developed in which the ferrite is sintered at 600° C./hour (see Japanese Patent Application Laid-open No. 91908/1983).
【０００５】[0005]
【発明が解決しようとする課題】上記の急速昇温による
方法は高透磁率化及び高密度化の点で極めて有効である
が、低酸素濃度雰囲気中で焼成するから、使用できる焼
成炉に制約があり、また比較的焼成コストもかかる等の
欠点がある。[Problems to be Solved by the Invention] The above-mentioned rapid temperature raising method is extremely effective in increasing magnetic permeability and density, but since it is fired in a low oxygen concentration atmosphere, there are restrictions on the firing furnace that can be used. It also has drawbacks such as relatively high firing costs.
【０００６】本発明の目的は、連続炉を用いた比較的短
時間の焼成サイクルで、高透磁率で高密度のマンガン−
亜鉛系フェライト材料を低コストで量産しうる方法を提
供することである。The object of the present invention is to produce high-permeability, high-density manganese with a relatively short firing cycle using a continuous furnace.
An object of the present invention is to provide a method for mass-producing zinc-based ferrite materials at low cost.
【０００７】[0007]
【課題を解決するための手段】上記の目的を達成できる
本発明は、従来一般に用いられている組成のマンガン−
亜鉛系フェライト材料に対して極く少量の三酸化モリブ
デンを添加し、大気中で急速昇温を行い焼成する方法で
ある。三酸化モリブデンの添加量は、主成分となるマン
ガン−亜鉛系フェライト材料に対して０．０１〜０．３
重量％の範囲とする。また焼成時の昇温条件は、雰囲気
を大気中とし、８００℃以上での昇温速度が２００〜１
０００℃／時の範囲とする。[Means for Solving the Problems] The present invention, which can achieve the above-mentioned objects, has a composition of manganese which has been generally used in the past.
This is a method in which a very small amount of molybdenum trioxide is added to a zinc-based ferrite material, and the material is rapidly heated and fired in the atmosphere. The amount of molybdenum trioxide added is 0.01 to 0.3 based on the manganese-zinc ferrite material, which is the main component.
The range is by weight%. The temperature raising conditions during firing are as follows: the atmosphere is air, and the temperature raising rate at 800°C or higher is 200 to 1
000°C/hour.
【０００８】ここで用いるマンガン−亜鉛系フェライト
材料は、通常、高透磁率酸化物磁性材料として用いられ
ているこの種の材料の組成範囲とほぼ同様であってよく
、例えばＦｅ２ Ｏ３ ５０〜５８モル％、ＺｎＯ
３〜３０モル％、残部がＭｎＯであるような組成範囲か
ら選ばれる。The manganese-zinc based ferrite material used here may have a composition range that is almost the same as that of this type of material normally used as a high permeability oxide magnetic material, for example, 50 to 58 moles of Fe2O3. %, ZnO
The composition is selected from a composition range of 3 to 30 mol %, with the remainder being MnO.
【０００９】フェライトの焼成は、連続炉による２４時
間以下の焼成サイクルで行うことができ、その際、特に
シール等を施す必要はない。[0009] The firing of ferrite can be carried out in a continuous furnace in a firing cycle of 24 hours or less, and there is no need for special sealing or the like.
【００１０】0010
【作用】上記の製造方法によって得られるマンガン−亜
鉛系フェライトの透磁率は従来品よりも向上する。それ
は以下の理由による。三酸化モリブデンは８００℃以上
で昇華し、昇華したモリブデンの高原子価イオンが粒界
近傍に存在することにより、粒界近傍の金属イオンの空
格子量が増加して粒界の移動度が高まり粒成長が促進さ
れる。本発明のように急速昇温すると、１３００℃以上
の粒成長過程まで三酸化モリブデンの昇華量が抑えられ
、三酸化モリブデンによる粒成長促進効果が持続するこ
とになる。そして最終的には添加した三酸化モリブデン
の殆どは昇華してしまい粒界近傍に残らないため、粒界
応力などによる透磁率の低下も見られず、高透磁率特性
が発現する。[Operation] The magnetic permeability of the manganese-zinc ferrite obtained by the above manufacturing method is improved compared to conventional products. This is due to the following reasons. Molybdenum trioxide sublimes at temperatures above 800°C, and the presence of high-valent ions of sublimated molybdenum near the grain boundaries increases the amount of vacancies of metal ions near the grain boundaries, increasing the mobility of the grain boundaries. Grain growth is promoted. When the temperature is raised rapidly as in the present invention, the amount of sublimation of molybdenum trioxide is suppressed until the grain growth process reaches 1300° C. or higher, and the grain growth promoting effect of molybdenum trioxide is maintained. Finally, most of the added molybdenum trioxide sublimes and does not remain in the vicinity of the grain boundaries, so no decrease in magnetic permeability due to grain boundary stress is observed, and high magnetic permeability characteristics are exhibited.
【００１１】[0011]
【実施例】図１はマンガン−亜鉛系フェライト（Ｆｅ２
Ｏ３ ５３モル％，ＺｎＯ ２０モル％，ＭｎＯ
２７モル％）に三酸化モリブデン（ＭｏＯ３ ）を０
〜０．５重量％添加し、８００℃以上での昇温速度を１
００〜１０００℃／時の範囲で変化させ大気中で昇温し
、焼成した時の透磁率を示している。焼成温度（トップ
温度）は１３７０℃、焼成時間（トップ温度維持時間）
は３時間である。[Example] Figure 1 shows manganese-zinc ferrite (Fe2
O3 53 mol%, ZnO 20 mol%, MnO
27 mol%) with 0 molybdenum trioxide (MoO3)
~0.5% by weight was added, and the temperature increase rate at 800°C or higher was increased to 1% by weight.
It shows the magnetic permeability when the material is heated and fired in the atmosphere while changing the temperature in the range of 00 to 1000° C./hour. Firing temperature (top temperature) is 1370℃, firing time (top temperature maintenance time)
is 3 hours.
【００１２】従来の通常の昇温条件（１００〜１５０℃
／時）では三酸化モリブデンを添加しても透磁率はあま
り改善されない。しかし急速昇温すると大気中の昇温で
も、少量の三酸化モリブデン添加によって透磁率が向上
することが分かる。昇温速度が２００〜８００℃／時の
範囲では、昇温速度が大きくなるほど透磁率は向上する
。昇温速度が１０００℃／時には、三酸化モリブデンの
添加量が少ない方が良好な結果が得られる。[0012] Conventional normal heating conditions (100 to 150°C
/hour), the magnetic permeability is not improved much even if molybdenum trioxide is added. However, it can be seen that when the temperature is rapidly increased, the magnetic permeability is improved by adding a small amount of molybdenum trioxide even when the temperature is raised in the atmosphere. When the temperature increase rate is in the range of 200 to 800° C./hour, the magnetic permeability improves as the temperature increase rate increases. When the temperature increase rate is 1000° C./hour, better results can be obtained if the amount of molybdenum trioxide added is smaller.
【００１３】[0013]
【発明の効果】本発明は上記のように、マンガン−亜鉛
系フェライトに三酸化モリブデンを少量添加し、急速昇
温し焼成する方法であるから、急速昇温により三酸化モ
リブデンの昇華を抑えることができ、そのため連続粒成
長が促進され、しかも最終的には三酸化モリブデンの殆
どは昇華してしまい粒界近傍に残らない。このため、粒
界応力などによる透磁率の低下も見られず、高透磁率を
発現させうる。そして、本発明方法では２４時間以下の
焼成サイクルで、しかも大気中昇温で、高透磁率磁性材
料の量産が可能であり、生産コストを大幅に下げること
ができる。また本発明方法では上記のように、粒成長が
促進され、添加物も粒界に残らないから、フライバック
トランス用コアのような高密度酸化物磁性も高性能化で
きる。[Effects of the Invention] As described above, the present invention is a method in which a small amount of molybdenum trioxide is added to manganese-zinc ferrite, and the temperature is rapidly raised and fired. This promotes continuous grain growth, and ultimately most of the molybdenum trioxide sublimes and does not remain near the grain boundaries. Therefore, no decrease in magnetic permeability due to grain boundary stress is observed, and high magnetic permeability can be exhibited. In addition, the method of the present invention allows mass production of high permeability magnetic materials with a firing cycle of 24 hours or less and at elevated temperature in the atmosphere, making it possible to significantly reduce production costs. Furthermore, as described above, in the method of the present invention, grain growth is promoted and additives do not remain at grain boundaries, so high-density oxide magnets such as cores for flyback transformers can also have high performance.
【図１】昇温速度をパラメータとした三酸化モリブデン
添加量−透磁率特性線図。FIG. 1 is a diagram showing the amount of molybdenum trioxide added versus magnetic permeability, with temperature increase rate as a parameter.
Claims (2)
して三酸化モリブデンを０．０１〜０．３重量％添加し
た原料を、８００℃以上での昇温速度が２００〜１００
０℃／時で且つ大気中で昇温し、焼成を行うことを特徴
とするマンガン−亜鉛系フェライトの製造方法。Claim 1: A raw material containing 0.01 to 0.3% by weight of molybdenum trioxide added to a manganese-zinc ferrite material has a heating rate of 200 to 100 at 800°C or higher.
A method for producing manganese-zinc ferrite, which comprises firing at a temperature of 0° C./hour in the atmosphere.
Ｆｅ２ Ｏ３５０〜５８モル％、ＺｎＯ ３〜３０モ
ル％、残部がＭｎＯである組成を有する請求項１記載の
製造方法。[Claim 2] The manganese-zinc ferrite material is
2. The manufacturing method according to claim 1, having a composition of 350 to 58 mol% of Fe2O, 3 to 30 mol% of ZnO, and the balance being MnO.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3115291A JPH04321522A (en) | 1991-04-18 | 1991-04-18 | Production of manganese-zinc-based ferrite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3115291A JPH04321522A (en) | 1991-04-18 | 1991-04-18 | Production of manganese-zinc-based ferrite |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04321522A true JPH04321522A (en) | 1992-11-11 |
Family
ID=14659023
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3115291A Pending JPH04321522A (en) | 1991-04-18 | 1991-04-18 | Production of manganese-zinc-based ferrite |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04321522A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014123709A (en) * | 2012-11-20 | 2014-07-03 | Jfe Chemical Corp | MnZn FERRITE CORE AND PROCESS OF MANUFACTURING THE SAME |
| JP2014123708A (en) * | 2012-11-20 | 2014-07-03 | Jfe Chemical Corp | MnZn FERRITE AND PROCESS OF MANUFACTURING THE SAME |
| CN105664950A (en) * | 2016-01-04 | 2016-06-15 | 南京林业大学 | Preparation method of nano porous ZnFe2O4 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6191908A (en) * | 1984-10-12 | 1986-05-10 | Fuji Elelctrochem Co Ltd | Manufacture of high permeability oxide magnetic material |
| JPS61178466A (en) * | 1985-01-31 | 1986-08-11 | ティーディーケイ株式会社 | Manganese-zinc base ferrite magnetic material |
-
1991
- 1991-04-18 JP JP3115291A patent/JPH04321522A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6191908A (en) * | 1984-10-12 | 1986-05-10 | Fuji Elelctrochem Co Ltd | Manufacture of high permeability oxide magnetic material |
| JPS61178466A (en) * | 1985-01-31 | 1986-08-11 | ティーディーケイ株式会社 | Manganese-zinc base ferrite magnetic material |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014123709A (en) * | 2012-11-20 | 2014-07-03 | Jfe Chemical Corp | MnZn FERRITE CORE AND PROCESS OF MANUFACTURING THE SAME |
| JP2014123708A (en) * | 2012-11-20 | 2014-07-03 | Jfe Chemical Corp | MnZn FERRITE AND PROCESS OF MANUFACTURING THE SAME |
| CN105664950A (en) * | 2016-01-04 | 2016-06-15 | 南京林业大学 | Preparation method of nano porous ZnFe2O4 |
| CN105664950B (en) * | 2016-01-04 | 2018-05-15 | 南京林业大学 | A kind of porous nano ZnFe2O4Preparation method |
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