JPH08133826A - Thermal shock-resistant ferrite material and ferrite core using thereof - Google Patents
Thermal shock-resistant ferrite material and ferrite core using thereofInfo
- Publication number
- JPH08133826A JPH08133826A JP6267821A JP26782194A JPH08133826A JP H08133826 A JPH08133826 A JP H08133826A JP 6267821 A JP6267821 A JP 6267821A JP 26782194 A JP26782194 A JP 26782194A JP H08133826 A JPH08133826 A JP H08133826A
- Authority
- JP
- Japan
- Prior art keywords
- ferrite
- ferrite material
- thermal shock
- cuo
- nio
- 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
Landscapes
- Compounds Of Iron (AREA)
- Magnetic Ceramics (AREA)
- Soft Magnetic Materials (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、耐熱衝撃性の高いフェ
ライト材料及びこれを用いたフェライトコアに関するも
のである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ferrite material having high thermal shock resistance and a ferrite core using the same.
【０００２】[0002]
【従来の技術】フェライト材料はインダクター素子等と
して広く使用されている。例えば、Ｆｅ2 Ｏ3 −ＺｎＯ
−ＮｉＯを主成分とするフェライト材料を用いてフェラ
イトコアを製造し、この巻線部にコイル線を巻回し、コ
イル線接続用のリードピンをフェライトコアに取り付け
て半田付けした構造のインダクター素子が使用されてい
る。2. Description of the Related Art Ferrite materials are widely used as inductor elements and the like. For example, Fe 2 O 3 —ZnO
-Inductor elements with a structure in which a ferrite core is manufactured using a ferrite material whose main component is NiO, a coil wire is wound around this winding part, and lead pins for coil wire connection are attached to the ferrite core and soldered Has been done.
【０００３】また、このインダクター素子を製造する場
合、リードピンをフェライトコアの所定位置に取り付け
た状態で溶融半田槽にフェライトコアを浸漬して半田付
けする方法が用いられている。When manufacturing this inductor element, a method is used in which the ferrite core is dipped and soldered in a molten solder bath with the lead pin attached to a predetermined position of the ferrite core.
【０００４】なお、上記フェライト材料の組成について
は、さまざまな提案が成されているが、例えば特開平１
−２２８１０８号公報には、フェライトの結晶粒界にＭ
ｎＯ、Ｂｉ2 Ｏ3 、ＳｉＯ2 から成る粒界層を形成し、
この粒界層によって応力を緩和するようにしたフェライ
ト材料が示されている。また、特開平１−１０３９５３
号公報にもＭｎＯ、Ｂｉ2 Ｏ3 、ＳｉＯ2 等の成分を添
加することによって耐熱衝撃性を高めたフェライト材料
が示されている。Various proposals have been made for the composition of the above ferrite material.
No. 228108 discloses that M is added to the grain boundary of ferrite.
forming a grain boundary layer composed of nO, Bi 2 O 3 and SiO 2 ;
A ferrite material is shown which is designed to relieve stress by this grain boundary layer. In addition, Japanese Patent Laid-Open No. 1-103953
The publication also discloses a ferrite material having improved thermal shock resistance by adding components such as MnO, Bi 2 O 3 , and SiO 2 .
【０００５】[0005]
【発明が解決しようとする課題】ところが、上記半田槽
にフェライトコアを浸漬して半田付けする工程におい
て、溶融半田は５００℃と高温であるためフェライトコ
アに急激な温度変化が生じ、熱衝撃によってフェライト
コアが破損してしまうという問題点があった。However, in the process of dipping and soldering the ferrite core in the solder bath, the temperature of the molten solder is as high as 500 ° C., so that the ferrite core undergoes a rapid temperature change and is subject to thermal shock. There was a problem that the ferrite core would be damaged.
【０００６】この問題点を解消するために、半田付け工
程の前にフェライトコアを予備加熱することが行われて
いるが、工程が多くなるため生産効率の悪いものであっ
た。In order to solve this problem, the ferrite core is preheated before the soldering step, but the number of steps is increased, resulting in poor production efficiency.
【０００７】また、フェライト材料の気孔率を５％以上
と高くして熱応力の分散を図ることも行われていたが、
この場合は強度等の機械的特性が低くなるという問題点
があった。Further, it has been attempted to increase the porosity of the ferrite material to 5% or more to disperse the thermal stress.
In this case, there is a problem that mechanical properties such as strength are lowered.
【０００８】さらに、特開平１−２２８１０８号、特開
平１−１０３９５３号公報に示されたものでは、ＳｉＯ
2 が存在するため透磁率が低下し、フェライト材料とし
ての特性が低くなってしまうという不都合があった。Further, in those disclosed in JP-A-1-228108 and JP-A-1-103953, SiO is used.
Since 2 is present, there is a disadvantage that the magnetic permeability is lowered and the characteristics as a ferrite material are lowered.
【０００９】そこで、本願発明は、透磁率や機械的特性
等を低下させず、予備加熱工程の不要な耐熱衝撃性の高
いフェライト材料を得ることを目的とする。Therefore, an object of the present invention is to obtain a ferrite material which has a high thermal shock resistance and which does not require a preheating step without deteriorating magnetic permeability and mechanical properties.
【００１０】[0010]
【課題を解決するための手段】本発明は、Ｆｅ2 Ｏ3 −
ＺｎＯ−ＮｉＯを主成分とするフェライト材料におい
て、０．１〜４重量％のＣｕＯと０．０５〜２重量％の
ＣｏＯを含有させて、このＣｕＯとＣｏＯによって結晶
粒界に効力緩和層を形成したことを特徴とする。The present invention is directed to Fe 2 O 3
A ferrite material containing ZnO-NiO as a main component contains 0.1 to 4% by weight of CuO and 0.05 to 2% by weight of CoO, and the CuO and CoO form an effect relaxation layer at a grain boundary. It is characterized by having done.
【００１１】つまり、本発明のフェライト材料は、主成
分であるＦｅ2 Ｏ3 、ＺｎＯ、ＮｉＯが主に結晶相を成
し、副成分として添加したＣｕＯとＣｏＯが主に結晶粒
界に存在して応力緩和層としてのガラス質相（液相）を
成している。そして、フェライト材料が熱衝撃を受けた
時、クラックの進展をこの応力緩和層で止めることがで
きるため、耐熱衝撃性を高くし、熱衝撃が加わった時の
破損を防止できるのである。That is, in the ferrite material of the present invention, the main components Fe 2 O 3 , ZnO, and NiO mainly form a crystal phase, and CuO and CoO added as auxiliary components are mainly present in the crystal grain boundaries. And forms a glassy phase (liquid phase) as a stress relaxation layer. When the ferrite material receives a thermal shock, the development of cracks can be stopped by this stress relaxation layer, so that the thermal shock resistance can be increased and the damage when the thermal shock is applied can be prevented.
【００１２】なお、このような結晶粒界のガラス質相の
存在は、ＥＰＭＡ等の組成分析によって確認することが
できる。The presence of such a glassy phase at the crystal grain boundary can be confirmed by a composition analysis such as EPMA.
【００１３】本発明において、各主成分の組成比は、Ｆ
ｅ2 Ｏ3 が５５〜７５重量％、ＺｎＯが１〜２５重量
％、ＮｉＯが５〜３５重量％の範囲内とする。これはＦ
ｅ2 Ｏ3 が５５重量％未満では透磁率が低くなり、また
ＺｎＯが２５重量％を超えるとキュリー点が低くなり、
さらにＮｉＯが３５重量％を超えると加圧安定性が悪く
なるためである。In the present invention, the composition ratio of each main component is F
e 2 O 3 is in the range of 55 to 75% by weight, ZnO is in the range of 1 to 25% by weight, and NiO is in the range of 5 to 35% by weight. This is F
When e 2 O 3 is less than 55% by weight, the magnetic permeability is low, and when ZnO exceeds 25% by weight, the Curie point is low.
Further, if NiO exceeds 35% by weight, the pressure stability becomes poor.
【００１４】また、ＣｕＯについては、０．１重量％未
満では上記の応力緩和効果が乏しく、一方４重量％を超
えるとＱ値が低下するため、０．１〜４重量％の範囲内
とする。さらに、ＣｏＯについては、０．０５重量％未
満であると上記応力緩和効果が乏しく、一方２重量％を
超えると加圧安定性が悪くなるため、０．０５〜２重量
％の範囲内とする。When CuO is less than 0.1% by weight, the above stress relaxation effect is poor. On the other hand, when it exceeds 4% by weight, the Q value is lowered. . Further, with respect to CoO, if it is less than 0.05% by weight, the above-mentioned stress relaxation effect is poor, while if it exceeds 2% by weight, the pressure stability becomes poor, so it is within the range of 0.05 to 2% by weight. .
【００１５】さらに、本発明において、上記成分以外に
３重量％以下のＭｎＯを含んでいても良い。このＭｎＯ
は、ＣｕＯやＣｏＯと共に主に応力緩和層に含まれ、応
力緩和効果を高めることができる。Further, in the present invention, in addition to the above components, 3% by weight or less of MnO may be contained. This MnO
Is mainly contained in the stress relaxation layer together with CuO and CoO and can enhance the stress relaxation effect.
【００１６】また、本発明においては、これらの成分以
外の不純物を若干量含んでいても良いが、ＳｉＯ2 につ
いては０．０３重量％以下とすることが好ましい。これ
はＳｉＯ2 が０．０３重量％を超えると透磁率が低くな
るためである。In the present invention, a small amount of impurities other than these components may be contained, but the content of SiO 2 is preferably 0.03% by weight or less. This is because if the SiO 2 content exceeds 0.03% by weight, the magnetic permeability decreases.
【００１７】また、本発明のフェライト材料は、応力緩
和層として結晶粒界にガラス質相を有するため、結晶が
成長しやすく平均結晶粒径は１５μｍ以上、好適には２
０μｍ以上となる。Further, since the ferrite material of the present invention has a glassy phase at the crystal grain boundaries as a stress relaxation layer, crystals are likely to grow and the average crystal grain size is 15 μm or more, preferably 2
It becomes 0 μm or more.
【００１８】さらに、本発明のフェライト材料は、気孔
のほとんど無い緻密質体としてある。これは、気孔が多
いと強度等の機械的特性が劣化するためであり、上記の
ように本発明のフェライト材料は耐熱衝撃性が高いこと
から気孔の無い緻密質体であっても破損を防止できるの
である。Further, the ferrite material of the present invention is a dense body having almost no pores. This is because mechanical properties such as strength are deteriorated when there are many pores. As described above, since the ferrite material of the present invention has high thermal shock resistance, damage is prevented even if it is a dense body having no pores. You can do it.
【００１９】本発明のフェライト材料の製造方法は、上
記組成範囲となるように各原料を調合し、ボールミル等
で粉砕混合した後、スプレードライヤーで造粒し、得ら
れた粉体をプレス成形によって所定形状に成形し、必要
に応じて切削加工等を施した後、１０００〜１２５０℃
の範囲で焼成することによって得ることができる。In the method for producing a ferrite material of the present invention, the respective raw materials are blended so as to have the above composition range, pulverized and mixed by a ball mill or the like, granulated by a spray dryer, and the obtained powder is subjected to press molding. 1000-1250 ° C after forming into a predetermined shape and cutting and the like if necessary
It can be obtained by firing within the range.
【００２０】そして、上記本発明のフェライト材料によ
り例えばドラム型のフェライトコアを製造すれば、リー
ドピン接続のための半田付け工程において、半田槽にフ
ェライトコアを浸漬しても破損が生じにくいことから、
歩留りを向上させ、生産効率を高めることができる。If, for example, a drum type ferrite core is manufactured from the above ferrite material of the present invention, damage is unlikely to occur even if the ferrite core is immersed in a solder bath in the soldering process for connecting lead pins.
The yield can be improved and the production efficiency can be improved.
【００２１】[0021]
【実施例】以下本発明実施例を説明する。EXAMPLES Examples of the present invention will be described below.
【００２２】表１に示す組成となるように各原料を調合
し、振動ミルで混合後、８００〜９００℃で仮焼し、こ
の粉体をボールミルにて粉砕し、バインダーを加えてス
プレードライヤーで造粒し、得られた造粒体をプレス成
形機によって成形した。得られた成形体を乾燥後、切削
加工し、１２００℃で１時間焼成して、図１に示すよう
な中央の巻線部１ａと両端のフランジ部１ｂを有するフ
ェライトコア１を得た。なお、寸法は、外径７ｍｍ、全
長６ｍｍとした。Each raw material was blended so as to have the composition shown in Table 1, mixed with a vibration mill, calcined at 800 to 900 ° C., this powder was pulverized with a ball mill, a binder was added, and a spray dryer was used. Granulation was performed, and the obtained granulated body was molded by a press molding machine. The obtained molded body was dried, cut, and fired at 1200 ° C. for 1 hour to obtain a ferrite core 1 having a central winding portion 1a and flange portions 1b at both ends as shown in FIG. The dimensions were an outer diameter of 7 mm and a total length of 6 mm.
【００２３】それぞれ得られたフェライトコア１につい
て、平均結晶粒径を測定した後、５００℃の半田層に３
秒間浸漬した時の破損確率を求める実験を行った。結果
は表１に示す通りである。The average crystal grain size of each of the obtained ferrite cores 1 was measured, and then 3 times was applied to the solder layer at 500 ° C.
An experiment was conducted to find the damage probability when immersed for a second. The results are shown in Table 1.
【００２４】この結果より明らかに、ＣｏＯを添加しな
い比較例ではコア破損率が８０％以上と高かったのに対
し、ＣｏＯを添加し、平均結晶粒径を１５μｍ以上とし
た本発明実施例は、コア破損率が０％と極めて耐熱衝撃
性が高いことがわかった。From these results, it is clear that the core breakage rate was as high as 80% or more in the comparative example in which CoO was not added, whereas the inventive example in which CoO was added and the average crystal grain size was 15 μm or more was It was found that the core breakage rate was 0% and the thermal shock resistance was extremely high.
【００２５】また、本発明実施例のフェライトコア１に
おいて、結晶粒界をＥＰＭＡで分析したところ、ＣｕＯ
とＣｏＯからなるガラス質相が存在しており、このため
に応力を緩和することができ、耐熱衝撃性を高められる
と考えられる。In the ferrite core 1 of the example of the present invention, the crystal grain boundaries were analyzed by EPMA.
It is considered that there is a glassy phase composed of CoO and CoO, which can alleviate the stress and enhance the thermal shock resistance.
【００２６】[0026]
【表１】 [Table 1]
【００２７】[0027]
【発明の効果】このように、本発明によれば、Ｆｅ2 Ｏ
3 −ＺｎＯ−ＮｉＯを主成分とするフェライト材料にお
いて、０．１〜４重量％のＣｕＯと０．０５〜２重量％
のＣｏＯを含有し、結晶粒界にＣｕＯとＣｏＯから成る
応力緩和層を形成したことによって、磁気特性や機械的
特性等を低下させることなく耐熱衝撃性の高いフェライ
ト材料を提供することができる。As described above, according to the present invention, Fe 2 O
In a ferrite material mainly composed of 3- ZnO-NiO, 0.1 to 4% by weight of CuO and 0.05 to 2% by weight
By forming the stress relaxation layer containing CuO and CuO and CoO at the crystal grain boundary, it is possible to provide a ferrite material having high thermal shock resistance without deteriorating magnetic properties, mechanical properties and the like.
【００２８】また本発明は、上記のフェライト材料を用
いてインダクター用のフェライトコアを形成したことに
よって、フェライトコアにリードピンを半田付けする工
程において、コアに予備加熱を行うことなく半田付けを
行うことができ、生産効率を向上させることができる。Further, according to the present invention, since the ferrite core for inductor is formed by using the above ferrite material, in the step of soldering the lead pin to the ferrite core, the core is soldered without preheating. It is possible to improve the production efficiency.
【図１】本発明実施例のフェライトコアを示す斜視図で
ある。FIG. 1 is a perspective view showing a ferrite core according to an embodiment of the present invention.
１ ：フェライトコア １ａ：巻線部 １ｂ：フランジ部 1: Ferrite core 1a: Winding part 1b: Flange part
Claims (3)
し、０．１〜４重量％のＣｕＯと０．０５〜２重量％の
ＣｏＯを含有し、結晶粒界にＣｕＯとＣｏＯから成る応
力緩和層を有することを特徴とする耐熱衝撃性フェライ
ト材料。1. Fe 2 O 3 —ZnO—NiO as a main component, containing 0.1 to 4% by weight of CuO and 0.05 to 2% by weight of CoO, and consisting of CuO and CoO at grain boundaries. A thermal shock resistant ferrite material having a stress relaxation layer.
〜７５重量％、ＺｎＯが１〜２５重量％、ＮｉＯが５〜
３５重量％の範囲内であることを特徴とする請求項１記
載の耐熱衝撃性フェライト材料。2. The composition ratio of the main components is such that Fe 2 O 3 is 55
~ 75 wt%, ZnO 1-25 wt%, NiO 5-5
The thermal shock-resistant ferrite material according to claim 1, which is in a range of 35% by weight.
めのコアであって、請求項１記載のフェライト材料から
成るフェライトコア。3. A ferrite core made of the ferrite material according to claim 1, which is a core for winding a coil wire into an inductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26782194A JP3554046B2 (en) | 1994-10-31 | 1994-10-31 | Thermal shock resistant ferrite material and ferrite core using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26782194A JP3554046B2 (en) | 1994-10-31 | 1994-10-31 | Thermal shock resistant ferrite material and ferrite core using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08133826A true JPH08133826A (en) | 1996-05-28 |
| JP3554046B2 JP3554046B2 (en) | 2004-08-11 |
Family
ID=17450081
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26782194A Expired - Lifetime JP3554046B2 (en) | 1994-10-31 | 1994-10-31 | Thermal shock resistant ferrite material and ferrite core using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3554046B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0800183A1 (en) * | 1996-04-05 | 1997-10-08 | Thomson-Csf | Ferrite with low losses within 1MHz and 100 MHz and manufacturing process |
| EP1065676A1 (en) * | 1999-06-29 | 2001-01-03 | Thomson-Csf | Ferrites with low losses |
| JP2002104871A (en) * | 2000-09-27 | 2002-04-10 | Kyocera Corp | Ferrite material and ferrite core using it |
| CN104756204A (en) * | 2012-10-31 | 2015-07-01 | 户田工业株式会社 | Ferrite sintered plate and ferrite sintered sheet |
| CN107382300A (en) * | 2016-05-17 | 2017-11-24 | 全球能源互联网研究院 | A kind of Ni-Zn soft magnetic ferrite material and preparation method thereof |
-
1994
- 1994-10-31 JP JP26782194A patent/JP3554046B2/en not_active Expired - Lifetime
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0800183A1 (en) * | 1996-04-05 | 1997-10-08 | Thomson-Csf | Ferrite with low losses within 1MHz and 100 MHz and manufacturing process |
| FR2747228A1 (en) * | 1996-04-05 | 1997-10-10 | Thomson Csf | FERRITE HAVING LOW LOSSES BETWEEN 1 MHZ AND 100 MHZ AND METHOD OF MAKING SAME |
| US6071430A (en) * | 1996-04-05 | 2000-06-06 | Thomson-Csf | Low-loss ferrite working between 1 MHZ and 100 MHZ and method of manufacture |
| US6436307B1 (en) | 1999-06-29 | 2002-08-20 | Thomson-Csf | Low loss ferrites |
| FR2795855A1 (en) * | 1999-06-29 | 2001-01-05 | Thomson Csf | LOW LOSS FERRITES |
| EP1065676A1 (en) * | 1999-06-29 | 2001-01-03 | Thomson-Csf | Ferrites with low losses |
| JP2002104871A (en) * | 2000-09-27 | 2002-04-10 | Kyocera Corp | Ferrite material and ferrite core using it |
| JP4587541B2 (en) * | 2000-09-27 | 2010-11-24 | 京セラ株式会社 | Ferrite material and ferrite core using the same |
| CN104756204A (en) * | 2012-10-31 | 2015-07-01 | 户田工业株式会社 | Ferrite sintered plate and ferrite sintered sheet |
| EP2916330A4 (en) * | 2012-10-31 | 2016-03-30 | Toda Kogyo Corp | Ferrite sintered plate and ferrite sintered sheet |
| US9824802B2 (en) | 2012-10-31 | 2017-11-21 | Toda Kogyo Corp. | Ferrite sintered plate and ferrite sintered sheet |
| CN104756204B (en) * | 2012-10-31 | 2019-01-22 | 户田工业株式会社 | Ferrite sintered plate and ferrite sintered |
| CN107382300A (en) * | 2016-05-17 | 2017-11-24 | 全球能源互联网研究院 | A kind of Ni-Zn soft magnetic ferrite material and preparation method thereof |
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