JP3024891B2 - Method for producing Mn-Zn ferrite - Google Patents
Method for producing Mn-Zn ferriteInfo
- Publication number
- JP3024891B2 JP3024891B2 JP5203260A JP20326093A JP3024891B2 JP 3024891 B2 JP3024891 B2 JP 3024891B2 JP 5203260 A JP5203260 A JP 5203260A JP 20326093 A JP20326093 A JP 20326093A JP 3024891 B2 JP3024891 B2 JP 3024891B2
- Authority
- JP
- Japan
- Prior art keywords
- ferrite
- znal
- furnace material
- zno
- core
- 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 - Fee Related
Links
Landscapes
- Compounds Of Iron (AREA)
- Magnetic Ceramics (AREA)
- Soft Magnetic Materials (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、高周波用軟磁性材料と
して使用されるMn−Zn系フェライトの製造方法に関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a Mn-Zn ferrite used as a high frequency soft magnetic material.
【０００２】[0002]
【従来の技術】Mn−Zn系ソフトフェライトは、一般に原
料酸化物を所定の配合になるように秤量した後、混合、
仮焼、粉砕、造粒の工程を経たものを所望の形状に圧縮
成形して成形体とし、これを適正な温度と雰囲気条件の
もとで焼成することによって製造されている。2. Description of the Related Art In general, a Mn-Zn soft ferrite is prepared by weighing a raw material oxide so as to have a predetermined composition, followed by mixing and mixing.
It is manufactured by compressing and molding into a desired shape a product that has undergone the steps of calcination, pulverization, and granulation, and firing this under appropriate temperature and atmosphere conditions.
【０００３】以上の製造工程において、Mn−Zn系フェラ
イトの焼成は通常1300〜1380℃の高温下で行われるが、
この際、フェライトコアの表面から亜鉛分が雰囲気へ逸
散され、特にコア表面部の組成が変化し、最終的に所望
の特性が得られないという問題点があった。この問題に
対処するために例えば特開平４−360503号公報に記載さ
れているようにMn−Zn系フェライト成形体をそれと同系
材質のフェライト製炉材を用いて焼成する方法が提案さ
れている。[0003] In the above manufacturing process, firing of Mn-Zn ferrite is usually performed at a high temperature of 1300 to 1380 ° C.
At this time, there is a problem in that zinc content escapes from the surface of the ferrite core into the atmosphere, and in particular, the composition of the core surface changes, so that desired characteristics cannot be finally obtained. To cope with this problem, a method has been proposed in which a Mn-Zn ferrite compact is fired using a ferrite furnace material of the same material as that described in, for example, JP-A-4-360503.
【０００４】[0004]
【発明が解決しようとする課題】しかし、上記に引用し
た技術によれば、焼成するMn−Zn系フェライトと同材質
系の炉材の場合、長時間にわたって使用すると炉材中の
Zn成分が低下して焼成コアの特性を劣化させたり、また
炉材自身に割れ等が発生し、使用不能となる場合が多か
った。However, according to the technique cited above, in the case of a furnace material of the same material type as the Mn-Zn ferrite to be fired, if the furnace material is used for a long period of time, the furnace material will not be used.
In many cases, the Zn component was reduced to deteriorate the properties of the fired core, or the furnace material itself was cracked or otherwise unusable.
【０００５】本発明は、長時間にわたって使用しても焼
成時のフェライトコア表面からの亜鉛成分の逸散を防
ぎ、磁気特性の劣化を抑制することのできる経済的で有
効なMn−Zn系フェライトの製造方法を提供することを目
的とするものである。[0005] The present invention provides an economical and effective Mn-Zn ferrite which can prevent the zinc component from escaping from the surface of the ferrite core during firing even when used for a long time and can suppress the deterioration of the magnetic properties. It is an object of the present invention to provide a production method of
【０００６】[0006]
【課題を解決するための手段】本発明は、Mn−Zn系フェ
ライト成形体を焼成するに際し、ZnAl2O4 製炉材料で取
り囲み、かつ成形体を載置するZnAl2O4 製炉材料上およ
び複数段積載するコア間にZnO を30〜80重量％含み残部
がZrO 2 からなる混合粉末を散布して焼成することを特徴
とするMn−Zn系フェライトの製造方法である。The present invention SUMMARY OF], upon firing the Mn-Zn ferrite green body, surrounded by ZnAl 2 O 4 made furnace material, and placing the molded body ZnAl 2 O 4 manufactured furnace material on And 30 to 80% by weight of ZnO between cores stacked in multiple stages
There Ru manufacturing method der of Mn-Zn ferrite, characterized by firing the sprayed powder mixture consisting of ZrO 2.
【０００７】[0007]
【作用】本発明者等は既に特開平５−3114号公報により
ZnAl2O4 をMnZnフェライトコア焼成用の敷板として使用
することを提案したが、これについて更に研究を重ねた
結果、該材質の炉材でMnZnフェライトコア成形体の全周
囲を取り囲んで焼成することによって、前述した焼成中
のコア表面からの亜鉛成分の逸散を防ぎ、磁気特性の劣
化を抑制できることを見出したものである。この時、成
形体を載置する炉材部上にZnO を含む粉末を散布して用
いることにより、その効果が一層高まることがわかっ
た。The present inventors have already disclosed in JP-A-5-3114.
It was proposed to use ZnAl 2 O 4 as a sole for firing MnZn ferrite core, but as a result of further study, it was found that the furnace material of this material surrounds the entire periphery of the MnZn ferrite core molded body and fires. Thus, the present inventors have found that the escape of the zinc component from the core surface during the above-mentioned firing can be prevented, and the deterioration of the magnetic properties can be suppressed. At this time, it was found that the effect was further enhanced by spraying and using the powder containing ZnO on the furnace material portion on which the compact was placed.
【０００８】ZnO を含有する粉末としては剥離作用を持
つZrO2との混合粉が推奨され、ZnO：ZrO2＝80〜30：残
部（重量比）がよい。ZnO が30重量％未満では、特性劣
化の抑制効果が不十分な場合が生じ、ZnO が80重量％を
超えると、焼成時、コア同士が焼結により固着してしま
う場合があり好ましくない。本発明の方法によって効果
が得られる理由は必ずしも明らかでないが、コアを囲む
ZnAl2O4 製炉材で仕切られる空間の雰囲気中のZn分が一
定濃度に保持されることに依っているのではないかと推
測される。As a powder containing ZnO, a mixed powder with ZrO 2 having a peeling action is recommended, and ZnO: ZrO 2 = 80 to 30: remainder
Parts (weight ratio ) is good. If ZnO is less than 30% by weight, the effect of suppressing the property deterioration may be insufficient. If ZnO exceeds 80% by weight, the cores may be fixed by sintering during firing, which is not preferable. Although it is not always clear why the method of the present invention produces an effect, it surrounds the core.
It is presumed that the Zn content in the atmosphere of the space partitioned by the ZnAl 2 O 4 furnace material is maintained at a constant concentration.
【０００９】また、雰囲気中のZn分はZnO 粉末からも供
給されるのでZnAl2O4 製炉材のZn分の減少が小さく、そ
のため炉材を長時間使用しても割れ等の発生がなく、安
定した生産が維持できる。Further, since the Zn content in the atmosphere is also supplied from ZnO powder, the decrease in the Zn content of the ZnAl 2 O 4 furnace material is small, so that cracking does not occur even if the furnace material is used for a long time. , Stable production can be maintained.
【００１０】[0010]
【実施例】最終組成としてFe2O3 ：53.0モル％、MnO ：
26.9モル％、ZnO ：20.1モル％となる基本組成の原料に
添加物としてSiO2、V2O5およびBi2O3 を配合し、 900℃
１時間の仮焼後、アトライター粉砕、ＰＶＡを加えた後
スプレードライヤー造粒したフェライト粉末を外径36mm
のトロイダルコアに成形した。EXAMPLE The final composition was Fe 2 O 3 : 53.0 mol%, MnO:
SiO 2 , V 2 O 5 and Bi 2 O 3 are added as additives to the raw material having a basic composition of 26.9 mol% and ZnO: 20.1 mol%, and 900 ° C.
After calcining for 1 hour, pulverizing attritor, adding PVA and then granulating the ferrite powder by granulation with a spray dryer to an outer diameter of 36 mm
Into a toroidal core.
【００１１】これらの成形体を12個ずつ２群に分け、Ａ
群はZnAl2O4 敷板上に載置したまま（比較例）、Ｂ群は
内寸法 100× 100×50mm、肉厚７mmのZnAl2O4 製の蓋付
きの匣鉢内に置き底面の部分およびコア間に ZnO：ZrO2
＝50：50（重量比）の粉を散布して（本発明例）1350℃
で焼成した。コアは３段積みとし得られた焼成コアにつ
いては、最も特性の劣る最上段コアと特性の優れる中段
コアの100kHzの初透磁率を測定・比較した。得られた結
果を表１に示す。These compacts are divided into two groups of 12 each,
Group B was placed on a ZnAl 2 O 4 floor plate (Comparative Example), Group B was placed in a sagger with a lid made of ZnAl 2 O 4 with inner dimensions of 100 × 100 × 50 mm and wall thickness of 7 mm, and the bottom part Between core and ZnO: ZrO 2
= 50: 50 (weight ratio) powder (Example of the present invention) 1350 ° C
Was fired. With respect to the fired cores obtained by stacking the cores in three stages, the initial permeability at 100 kHz of the uppermost core having the lowest characteristics and the middle core having the highest characteristics was measured and compared. Table 1 shows the obtained results.
【００１２】[0012]
【表１】 [Table 1]
【００１３】なお、上記実施例で用いたZnAl2O4 製の蓋
付きの匣鉢に ZnO：ZrO 2 ＝50：50の粉を入れて用いた場
合、 100回使用しても匣鉢に割れ等の発生もなく、フェ
ライトの特性の劣化も殆んどなかったのに対して、同じ
匣鉢にZnO ：ZrO 2 ＝50：50の粉を入れなかったものは、
特性が使用回数が増すにつれて１割程度まで劣化する傾
向がみられた。When the powder of ZnO : ZrO 2 = 50: 50 is used in the sagger with a lid made of ZnAl 2 O 4 used in the above embodiment, the sagger breaks even after being used 100 times. While no ferrite characteristics were degraded and no ZnO : ZrO 2 = 50: 50 powder was put in the same box,
The characteristics tended to deteriorate to about 10% as the number of uses increased.
【００１４】[0014]
【発明の効果】本発明は、Mn−Zn系フェライト成形体を
焼成するにあたり、ZnAl2O4 製炉材で取り囲んで、かつ
ZnO を30〜80重量％含み残部がZrO 2 からなる混合粉末を
入れて焼成することによって、焼成中のコア表面からの
亜鉛分の逸散を抑制し製品特性の劣化を抑制する効果と
ZnAl2O4製匣鉢の長期使用を可能とする効果を得た。According to the present invention, in firing a Mn-Zn based ferrite compact, it is surrounded by a ZnAl 2 O 4 furnace material, and
By the balance comprises ZnO 30 to 80% by weight calcined putting a mixed powder consisting of ZrO 2, and the effect of suppressing the deterioration of the zinc content of suppressing escape product characteristics from the core surface during firing
The effect of enabling long-term use of the ZnAl 2 O 4 sagger was obtained.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) H01F 1/34 G01G 49/00 C04B 35/38 H01F 41/02 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. 7 , DB name) H01F 1/34 G01G 49/00 C04B 35/38 H01F 41/02
Claims (1)
際し、ZnAl2O4 製炉材料で取り囲み、かつ成形体を載置
するZnAl2O4 製炉材料上および複数段積載するコア間に
ZnO を30〜80重量％含み残部がZrO 2 からなる混合粉末を
散布して焼成することを特徴とするMn−Zn系フェライト
の製造方法。When firing a Mn-Zn based ferrite molded body, it is surrounded by a ZnAl 2 O 4 furnace material, and is placed between the ZnAl 2 O 4 furnace material on which the molded body is mounted and the core mounted in a plurality of stages.
Mn-Zn-based method for producing a ferrite, characterized in that the balance comprises ZnO 30 to 80% by weight is calcined by dispersing a mixed powder composed of ZrO 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5203260A JP3024891B2 (en) | 1993-08-17 | 1993-08-17 | Method for producing Mn-Zn ferrite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5203260A JP3024891B2 (en) | 1993-08-17 | 1993-08-17 | Method for producing Mn-Zn ferrite |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0757923A JPH0757923A (en) | 1995-03-03 |
| JP3024891B2 true JP3024891B2 (en) | 2000-03-27 |
Family
ID=16471090
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5203260A Expired - Fee Related JP3024891B2 (en) | 1993-08-17 | 1993-08-17 | Method for producing Mn-Zn ferrite |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3024891B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106830916B (en) * | 2016-12-19 | 2020-01-10 | 江西尚朋电子科技有限公司 | Manganese-zinc power ferrite material and preparation method of elements thereof |
-
1993
- 1993-08-17 JP JP5203260A patent/JP3024891B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0757923A (en) | 1995-03-03 |
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