JP3042627B2 - Low loss ferrite - Google Patents
Low loss ferriteInfo
- Publication number
- JP3042627B2 JP3042627B2 JP2048713A JP4871390A JP3042627B2 JP 3042627 B2 JP3042627 B2 JP 3042627B2 JP 2048713 A JP2048713 A JP 2048713A JP 4871390 A JP4871390 A JP 4871390A JP 3042627 B2 JP3042627 B2 JP 3042627B2
- Authority
- JP
- Japan
- Prior art keywords
- loss
- sio
- low
- ppm
- 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.)
- Expired - Lifetime
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- Magnetic Ceramics (AREA)
- Soft Magnetic Materials (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、スイッチング電源等の磁心として用いるの
に適したMn−Zn系の低損失フェライトに関するものであ
る。The present invention relates to a low-loss Mn-Zn ferrite suitable for use as a magnetic core of a switching power supply or the like.
（従来の技術） 従来のMn−Zn系の低損失フェライトは、CaO,SiO2を添
加したものが知られており、更にNb2O5,V2O5,TiO2,Ta2O
5等を添加したものがあった。(Prior art) Conventional Mn-Zn based low loss ferrites to which CaO and SiO 2 are added are known, and Nb 2 O 5 , V 2 O 5 , TiO 2 , Ta 2 O
Some added 5 mag.
例えば、特開昭58−114401号公報には、MnO,ZnO,Fe2O
3を主成分とし、CaOを0.04〜0.2重量％、Nb2O5を０を含
まず0.1重量％以下、かつSiO2を０を含まず0.05重量％
以下を副成分として複合添加含有したことを特徴とする
電源用超低損失フェライトが開示されている。For example, JP-A-58-114401 discloses MnO, ZnO, Fe 2 O
3 as a main component, the CaO 0.04 to 0.2 wt%, the Nb 2 O 5 0.1 wt% exclusive of 0, and the SiO 2 0.05 wt% exclusive of 0
An ultra-low-loss ferrite for a power supply, characterized by containing the following as a secondary component, is disclosed.
また、特開昭63−62206号公報には、MnO,ZnO及びFe2O
3を主成分とし、TiO2を500〜6000ppm,Ta2O5を100〜2000
ppm,SiO2を150〜270ppm及びCaOを500〜2000ppm副成分と
して複合添加含有したことを特徴とする電源用超低損失
フェライトが開示されている。JP-A-63-62206 discloses MnO, ZnO and Fe 2 O.
3 as the main component, TiO 2 500-6000 ppm, Ta 2 O 5 100-2000
An ultra-low loss ferrite for power supply, characterized in that it contains 150 to 270 ppm of ppm, SiO 2 and 500 to 2,000 ppm of CaO as subcomponents in combination.
（発明が解決しょうとする問題点） 500kHz以上の高周波領域で電力損失の小さい低損失フ
ェライトを得ようとした場合、例えばSiO2が500ppm以下
という広い範囲全域において低損失を達成することは困
難であった。When obtaining a small low-loss ferrite power loss at 500kHz or more high-frequency region (invention Problems to you'll resolution), for example, the SiO 2 to achieve low loss in a wide range throughout that 500ppm or less difficult there were.
例えば、SiO2を500ppm含有するとき、1200℃で焼成す
ると異常焼結し、又1100℃で焼成すると密度が低いとい
う不具合があり、SiO2を50ppm含有するとき、1200℃で
焼成すると密度が低く、1300℃で焼成すると結晶粒径が
大きくなり、高周波で低損失とならないという不具合が
あった。For example, when 500ppm containing SiO 2, abnormally sinter when fired at 1200 ° C., also when fired at 1100 ° C. density there is a disadvantage that low, when 50ppm containing SiO 2, the density is low when fired at 1200 ° C. When firing at 1300 ° C., there was a problem that the crystal grain size became large and the loss was not reduced at high frequency.
本発明は、上記の事を鑑みて、SiO2の含有量に着目
し、最適な含有量により、低損失フェライトを得ること
を目的とする。In view of the above, an object of the present invention is to focus on the content of SiO 2 and obtain a low-loss ferrite with an optimum content.
（問題点を解決するための手段） 本発明は、Fe2O3,MnO,ZnOを主成分とし、CaO 200〜1
000ppm,SiO2 280〜400ppm,Ta2O5 200〜1500ppm,TiO2
1000〜20000ppm、及び不可避不純物からなり、500KHz
以上の周波数で使用する低損失フェライトである。ここ
で不可避不純物とは、素原料中に含まれ本発明の低損失
フェライトに不可避的に混入する不純物であったり、本
発明の低損失フェライトの製造工程において不可避的に
混入する不純物である。(Means for Solving the Problems) The present invention mainly comprises Fe 2 O 3 , MnO, and ZnO,
000ppm, SiO 2 280 ~ 400ppm, Ta 2 O 5 200 ~ 1500ppm, TiO 2
Consisting of 1000-20000ppm and unavoidable impurities, 500KHz
This is a low-loss ferrite used at the above frequencies. Here, the unavoidable impurities are impurities which are contained in the raw material and are unavoidably mixed into the low-loss ferrite of the present invention, or are unavoidably mixed in the production process of the low-loss ferrite of the present invention.
（実施例） 実施例１ Fe2O3（53.5mol％）,MnO（37.5mol％）,ZnO（9.0mol
％）を主成分とする原料をボールミルにて混合後、900
℃にて仮焼成し、副成分として、CaOに換算して400ppm
となる適量のCaCO3,SiO2を300ppm,Ta2O5を500ppmTiO2を
1000pppm複合添加し、ボールミルにて12時間粉砕した。
但し、CaO,SiO2のように、予め原料に含有されている副
成分については、仮焼成後に添加する量をその分だけ減
じ、全体として上記成分の割合に一致する様にした。こ
の粉砕原料を乾燥後、バインダーを1.0wt％添加し、造
粒、成形した。この成形体を焼成温度1150℃、焼成雰囲
気は酸素分圧0.1％にて５時間焼成した。なお、焼成体
の形状は、外径25mm、内径15mm、高さ7.5mmのリング状
とした。(Example) Example 1 Fe 2 O 3 (53.5mol% ), MnO (37.5mol%), ZnO (9.0mol
%) As a main component in a ball mill,
Temporary baking at ℃, 400ppm in terms of CaO
300ppm of CaCO 3 and SiO 2 and 500ppm of Ta 2 O 5
1000pppm composite was added and pulverized by a ball mill for 12 hours.
However, for the sub-components such as CaO and SiO 2 which were previously contained in the raw material, the amount added after the calcination was reduced by that amount so that the proportion of the components as a whole was matched. After drying the pulverized raw material, a binder was added at 1.0 wt%, and the mixture was granulated and molded. This molded body was fired for 5 hours at a firing temperature of 1150 ° C. and a firing atmosphere of 0.1% oxygen partial pressure. The shape of the fired body was a ring shape having an outer diameter of 25 mm, an inner diameter of 15 mm, and a height of 7.5 mm.
この実施例１と同様の試料作製工程において、添加物
を変えて各試料を作製した。その結果を第１表に示す。In the same sample preparation process as in Example 1, each sample was prepared by changing additives. Table 1 shows the results.
また、実施例１と同様の試料作製工程において、CaO
を400ppm,Ta2O5を500ppmとし、SiO2の添加量を変えたと
きの電力損失のグラフを第１図に示す。 In the same sample preparation process as in Example 1, CaO
Is 400 ppm and Ta 2 O 5 is 500 ppm. FIG. 1 shows a graph of power loss when the amount of SiO 2 added is changed.
本発明において、各成分範囲を限定した理由は以下の
とおりである。CaOが200ppmより少ないと電気抵抗が低
下するため、高周波領域における渦電流損失が増大し、
電力損失は大きくなり、1000ppmより多いと電力損失が
大きくなり、又透磁率が急激に低下する。SiO2が280ppm
より少ないと焼結密度が上がらなく、400ppmより多いと
異常焼結が起こり、損失が増大すると共に、透磁率及び
Ｑ値も低下する。また、Ta2O5,TiO2のそれぞれの範囲を
限定した理由は、Ta2O5が本発明の範囲より多いと、異
常焼結し、損失が増大すると共に、透磁率及びＱ値も低
下する。また、Ta2O5が本発明の範囲より少ないと、電
気抵抗が低下し、損失が増大する。またTiO2は電力損失
の温度特性を改善し、広い温度範囲で低損失を達成する
ために添加したが、1000ppm未満ではその添加効果が得
られなく、20000ppmより多いと損失が増大する。In the present invention, the reasons for limiting the range of each component are as follows. If CaO is less than 200 ppm, the electric resistance decreases, so the eddy current loss in the high frequency region increases,
The power loss increases, and if it exceeds 1000 ppm, the power loss increases and the magnetic permeability sharply decreases. 280 ppm SiO 2
If the amount is less than the above, the sintering density will not increase. Also, the reason for limiting the respective ranges of Ta 2 O 5 and TiO 2 is that if Ta 2 O 5 is more than the range of the present invention, abnormal sintering occurs, loss increases, and magnetic permeability and Q value decrease. I do. Further, when Ta 2 O 5 is less than the range of the present invention, the electric resistance decreases and the loss increases. TiO 2 is added to improve the temperature characteristics of power loss and achieve low loss over a wide temperature range. However, if it is less than 1000 ppm, the effect of its addition cannot be obtained, and if it is more than 20,000 ppm, the loss increases.
（発明の効果） 本発明によれば、SiO2の含有量を最適にすることによ
り、500kHz以上の高周波領域で電力損失の小さい低損失
フライトを得ることができる。(Effect of the Invention) According to the present invention, by optimizing the content of SiO 2 , it is possible to obtain a low-loss flight with low power loss in a high-frequency region of 500 kHz or more.
第１図は、SiO2の添加量を変化させたときの電力損失を
表わすグラフである。FIG. 1 is a graph showing power loss when the added amount of SiO 2 is changed.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平３−224204（ＪＰ，Ａ) 特開 昭60−262405（ＪＰ，Ａ) 特開 昭60−132301（ＪＰ，Ａ) 特開 昭58−114401（ＪＰ，Ａ) 特開 昭58−36974（ＪＰ，Ａ) 特開 平３−145704（ＪＰ，Ａ) 特開 平３−184307（ＪＰ，Ａ) ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-224204 (JP, A) JP-A-60-262405 (JP, A) JP-A-60-132301 (JP, A) JP-A-58-58 114401 (JP, A) JP-A-58-36974 (JP, A) JP-A-3-145704 (JP, A) JP-A-3-184307 (JP, A)
Claims (1)
000ppm,SiO2 280〜400ppm,Ta2O5 200〜1500ppm,TiO2
1000〜20000ppm、及び不可避不純物からなり、500KHz
以上の周波数で使用することを特徴とする低損失フェラ
イト。1. A method according to claim 1, wherein the main component is Fe 2 O 3 , MnO, ZnO,
000ppm, SiO 2 280 ~ 400ppm, Ta 2 O 5 200 ~ 1500ppm, TiO 2
Consisting of 1000-20000ppm and unavoidable impurities, 500KHz
A low-loss ferrite used at the above frequencies.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2048713A JP3042627B2 (en) | 1990-02-26 | 1990-02-26 | Low loss ferrite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2048713A JP3042627B2 (en) | 1990-02-26 | 1990-02-26 | Low loss ferrite |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9043102A Division JP2963067B2 (en) | 1997-02-27 | 1997-02-27 | Low loss ferrite |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03248404A JPH03248404A (en) | 1991-11-06 |
| JP3042627B2 true JP3042627B2 (en) | 2000-05-15 |
Family
ID=12810947
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2048713A Expired - Lifetime JP3042627B2 (en) | 1990-02-26 | 1990-02-26 | Low loss ferrite |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3042627B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3044666B2 (en) * | 1990-02-26 | 2000-05-22 | 日立金属株式会社 | Low loss ferrite for power supply |
| JPH0744098B2 (en) * | 1990-03-03 | 1995-05-15 | 川崎製鉄株式会社 | Low loss Mn-Zn ferrite |
| JP2788112B2 (en) * | 1990-10-16 | 1998-08-20 | アルプス電気株式会社 | Mn-Zn ferrite for magnetic head |
| JP3607203B2 (en) | 2000-03-31 | 2005-01-05 | Ｔｄｋ株式会社 | Manufacturing method of MnZn ferrite, MnZn ferrite, and ferrite core for power supply |
| WO2002081129A1 (en) * | 2001-04-02 | 2002-10-17 | Mitsubishi Materials Corporation | Composite soft magnetic sintered material having high density and high magnetic permeability and method for preparation thereof |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6049150B2 (en) * | 1981-08-27 | 1985-10-31 | 住友特殊金属株式会社 | Manufacturing method of low magnetic loss Mn-Zn ferrite |
| JPS58114401A (en) * | 1981-12-28 | 1983-07-07 | Tdk Corp | Superlow loss ferrite for power source |
| JPS60132301A (en) * | 1983-12-20 | 1985-07-15 | Sumitomo Special Metals Co Ltd | Oxide magnetic material |
| JPS60262405A (en) * | 1984-06-11 | 1985-12-25 | Sumitomo Special Metals Co Ltd | Manufacture of mn-zn ferrite |
| JP2551491B2 (en) * | 1989-02-04 | 1996-11-06 | 株式会社トーキン | Low loss oxide magnetic material |
| JPH03145704A (en) * | 1989-10-31 | 1991-06-20 | Tokin Corp | Low loss oxide magnetic material |
| JP3039784B2 (en) * | 1989-12-13 | 2000-05-08 | 日立金属株式会社 | High frequency low loss ferrite for power supply |
-
1990
- 1990-02-26 JP JP2048713A patent/JP3042627B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03248404A (en) | 1991-11-06 |
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