JPH0732095B2 - Thermal shock resistant ferrite material - Google Patents
Thermal shock resistant ferrite materialInfo
- Publication number
- JPH0732095B2 JPH0732095B2 JP3122156A JP12215691A JPH0732095B2 JP H0732095 B2 JPH0732095 B2 JP H0732095B2 JP 3122156 A JP3122156 A JP 3122156A JP 12215691 A JP12215691 A JP 12215691A JP H0732095 B2 JPH0732095 B2 JP H0732095B2
- Authority
- JP
- Japan
- Prior art keywords
- thermal shock
- ferrite material
- ferrite
- porosity
- grain size
- 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
- 229910000859 α-Fe Inorganic materials 0.000 title claims description 22
- 239000000463 material Substances 0.000 title claims description 16
- 230000035939 shock Effects 0.000 title claims description 14
- WMWLMWRWZQELOS-UHFFFAOYSA-N bismuth(iii) oxide Chemical compound O=[Bi]O[Bi]=O WMWLMWRWZQELOS-UHFFFAOYSA-N 0.000 claims description 16
- 239000013078 crystal Substances 0.000 claims description 10
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 4
- 229910004298 SiO 2 Inorganic materials 0.000 claims 1
- 229910007541 Zn O Inorganic materials 0.000 claims 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- 239000000654 additive Substances 0.000 description 4
- 229910052681 coesite Inorganic materials 0.000 description 4
- 229910052906 cristobalite Inorganic materials 0.000 description 4
- 230000004907 flux Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- 235000012239 silicon dioxide Nutrition 0.000 description 4
- 229910052682 stishovite Inorganic materials 0.000 description 4
- 229910052905 tridymite Inorganic materials 0.000 description 4
- 238000010304 firing Methods 0.000 description 3
- 229910000679 solder Inorganic materials 0.000 description 3
- 238000005476 soldering Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- HTUMBQDCCIXGCV-UHFFFAOYSA-N lead oxide Chemical compound [O-2].[Pb+2] HTUMBQDCCIXGCV-UHFFFAOYSA-N 0.000 description 2
- YEXPOXQUZXUXJW-UHFFFAOYSA-N lead(II) oxide Inorganic materials [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 229910015902 Bi 2 O 3 Inorganic materials 0.000 description 1
- FUJCRWPEOMXPAD-UHFFFAOYSA-N Li2O Inorganic materials [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 description 1
- 229910018605 Ni—Zn Inorganic materials 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- XUCJHNOBJLKZNU-UHFFFAOYSA-M dilithium;hydroxide Chemical compound [Li+].[Li+].[OH-] XUCJHNOBJLKZNU-UHFFFAOYSA-M 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
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、耐熱衝撃性を有するフ
ェライト材料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 thermal shock resistance.
【０００２】[0002]
【従来の技術】フェライトコアにコイルを施し、インダ
クターとして使用するものの中には、フェライトコアに
コイルの端末接続用のリードピンを植設し、このリード
ピンにコイルの端末を絡げ、はんだ付けしたものが広く
使用されている。2. Description of the Related Art Among ferrite cores that are coiled and used as inductors, ferrite cores are provided with lead pins for coil end connection, and the lead pins are entangled and soldered. Is widely used.
【０００３】この様なインダクターの場合、リードピン
にコイルの端末をはんだ付けする方法として、リードピ
ンにコイルの端末を絡げた状態で、高温のはんだ槽にコ
アを挿入し、はんだ付けする方法が用いられている。こ
の場合、コアには急激な温度変化が生じ、この熱衝撃に
よりコアが割れるといった問題があった。In the case of such an inductor, as a method of soldering the end of the coil to the lead pin, a method of inserting the core into a high temperature solder bath with the end of the coil entwined with the lead pin and soldering is used. ing. In this case, there has been a problem that a sudden temperature change occurs in the core and the core is cracked by this thermal shock.
【０００４】これに対し、従来のフェライトでは、材料
の空孔率を５％以上に高めて、熱応力の分散を図ること
により対応していた。On the other hand, in the conventional ferrite, the porosity of the material is increased to 5% or more to disperse the thermal stress.
【０００５】[0005]
【発明が解決しようとする課題】従来の方法、すなわ
ち、材料の空孔率を高める方法では、フェライト材料の
強度、飽和磁束密度、透磁率等が比較的小さくなり、実
用上の問題が生じ、この問題を解決しようとすると空孔
率を小さくしていく必要があり、耐熱衝撃性に優れ、し
かも強度、飽和磁束密度、透磁率等を満足するフェライ
ト材料が得られなく、そのようなフェライト材料が切望
されていた。In the conventional method, that is, the method of increasing the porosity of the material, the strength, the saturation magnetic flux density, the magnetic permeability, etc. of the ferrite material become relatively small, which causes practical problems. In order to solve this problem, it is necessary to reduce the porosity, and it is not possible to obtain a ferrite material that is excellent in thermal shock resistance and that satisfies strength, saturation magnetic flux density, magnetic permeability, etc. Was longed for.
【０００６】これに対し、本発明者等は、特開平１―１
０３９５３号公報に記載されているように、Ｎｉ―Ｚｎ
系のフェライトにＢｉ２Ｏ３、ＰｂＯを所定量添加して
耐熱衝撃性を改善できることを発明している。本発明者
等は、これらのフェライト材料について、鋭意研究を重
ねた結果、低い空孔率で特定の結晶粒径のときに、高い
電磁気特性及び強度を有し、かつ耐熱衝撃性に優れたフ
ェライト材料を得ることができることを見い出したもの
である。On the other hand, the present inventor et al.
As described in Japanese Patent No. 03953, Ni-Zn
It is invented that the thermal shock resistance can be improved by adding predetermined amounts of Bi2O3 and PbO to the system ferrite. The present inventors have conducted extensive studies on these ferrite materials, and as a result, ferrite having high electromagnetic characteristics and strength and excellent thermal shock resistance when the porosity is low and a specific crystal grain size is obtained. It has been found that the material can be obtained.
【０００７】[0007]
【課題を解決するための手段】本発明は、Ｆｅ２Ｏ３を
４０〜５０ｍｏｌ％、ＺｎＯを１０〜３５ｍｏｌ％、Ｃ
ｕＯを３〜１０ｍｏｌ％、残部ＮｉＯからなるフェライ
トに、Ｂｉ２Ｏ３又はＰｂＯを０．０３〜２重量％添加
し、焼成後の空孔率を５％以下にした上、結晶組織を平
均粒径２０〜６０μｍにコントロールしたフェライト材
料である。これにより、耐熱衝撃性に優れ、しかも強
度、飽和磁束密度、透磁率が高いフェライト材料を得る
ことができる。According to the present invention, Fe2O3 is 40 to 50 mol%, ZnO is 10 to 35 mol%, and C is
uO is added in an amount of 3 to 10 mol% and the balance NiO is added to Bi2O3 or PbO in an amount of 0.03 to 2% by weight, and the porosity after firing is set to 5% or less. It is a ferrite material controlled to 60 μm. This makes it possible to obtain a ferrite material having excellent thermal shock resistance and high strength, saturation magnetic flux density, and magnetic permeability.
【０００８】また、本発明のフェライト材料は、ＮｉＯ
の多くとも１／２以下が、ＭｇＯ及び／又は（１／４）
（Ｌｉ２Ｏ＋Ｆｅ２Ｏ３）及び／又はＭｎ酸化物に置換
しても同様の効果を得ることができる。又、ＳｉＯ２を
０〜１ｗｔ％添加しても同様の効果を得ることができ
る。The ferrite material of the present invention is made of NiO.
At most 1/2 or less is MgO and / or (1/4)
Similar effects can be obtained by substituting (Li2O + Fe2O3) and / or Mn oxide. Also, the same effect can be obtained by adding 0 to 1 wt% of SiO2.
【０００９】[0009]
【実施例】表１の組成比で各試料を秤量、混合し、８５
０℃で２時間仮焼した後、振動ミルで粉砕し、１〜１．
５μｍのフェライト粉末を作成した。このフェライト粉
末に、乳鉢でＢｉ２Ｏ３、ＰｂＯ、ＳｉＯ２を所定量添
加混合し、これを造粒し、丸棒状コアに成形し、乾燥
後、ダイヤグラインダーで溝加工し、ドラム型コアと
し、これを空気中１１００℃２時間で焼成し試料を作成
した。この試料を４５０℃の半田槽に全長の約半分を浸
漬し、コアの破壊率を集計し、耐熱衝撃性の評価を行な
った。又、この試料について、空孔率、結晶の平均粒
径、強度、透磁率、飽和磁束密度の測定を行なった。[Example] Each sample was weighed and mixed at the composition ratio shown in Table 1, and 85
After calcination at 0 ° C. for 2 hours, it was pulverized with a vibration mill to give 1-1.
A 5 μm ferrite powder was prepared. A predetermined amount of Bi2O3, PbO, and SiO2 were added to and mixed with this ferrite powder in a mortar, and the mixture was granulated, molded into a round bar-shaped core, dried, and then grooved with a diamond grinder to form a drum-shaped core. A sample was prepared by baking at 1100 ° C. for 2 hours. About half of the entire length of this sample was immersed in a solder bath at 450 ° C., the fracture rate of the core was totaled, and the thermal shock resistance was evaluated. Further, with respect to this sample, the porosity, the average grain size of crystals, the strength, the magnetic permeability, and the saturation magnetic flux density were measured.
【００１０】[0010]
【表１】 [Table 1]
【００１１】この各試料の破壊率、空孔率、結晶の平均
粒径、抗折強度、μｉ、Ｂｍの各特性値を表２に示す。
表２において、試料１〜１０は添加物なし、試料１１〜
２０は、それぞれ試料１〜１０にＢｉ２Ｏ３を０．３ｗ
ｔ％添加したもの、試料２１は、顆粒を３００μｍ〜５
００μｍとし、焼成体の空孔率を高めたものである。Table 2 shows characteristic values of fracture rate, porosity, average grain size of crystal, bending strength, μi and Bm of each sample.
In Table 2, Samples 1 to 10 have no additives, Samples 11 to 11
20: Bi2O3 0.3w in each of the samples 1-10
The sample to which t% was added, Sample 21 had granules of 300 μm-5.
It is made to be 00 μm to increase the porosity of the fired body.
【００１２】[0012]
【表２】 [Table 2]
【００１３】この試料２１を見ればわかるとおり、空孔
率を高めた場合、破壊率を小さくすることはできるが、
抗折強度、μｉ、Ｂｍの低下が大きく、Ｂｉ２Ｏ３添加
により結晶粒径を２０〜６０μｍに制御する方法が有利
であることがわかる。As can be seen from this sample 21, when the porosity is increased, the fracture rate can be reduced, but
It can be seen that the method of controlling the crystal grain size to 20 to 60 μm by adding Bi 2 O 3 is advantageous because the bending strength, μi and Bm are largely decreased.
【００１４】次に、試料３にＢｉ２Ｏ３を０．３ｗｔ％
添加したものと、ＰｂＯを０．３ｗｔ％添加したもの
と、Ｂｉ２Ｏ３を０．３ｗｔ％及びＳｉＯ２を０．１ｗ
ｔ％添加したものとを、それぞれ焼成温度を変化させて
結晶粒径を変化させ、そのときの破壊率と空孔率を表３
に示す。また、同じものを図１に示す。この表３及び図
１から明らかなように、結晶粒径が２０〜６０μｍであ
る時に、優れた耐熱衝撃性を有することがわかる。Next, 0.3 wt% of Bi2O3 was added to the sample 3.
Added, PbO added 0.3 wt%, Bi2O3 0.3 wt% and SiO2 0.1 w
Table 3 shows the fracture rate and the porosity at the time when the firing temperature was changed and the crystal grain size was changed.
Shown in. Moreover, the same thing is shown in FIG. As is clear from Table 3 and FIG. 1, when the crystal grain size is 20 to 60 μm, it has excellent thermal shock resistance.
【００１５】[0015]
【表３】 [Table 3]
【００１６】また、焼成温度を１１００℃とし、添加物
（Ｂｉ２Ｏ３、ＰｂＯ、ＳｉＯ２）の添加量を変えたと
きの破壊率、空孔率、結晶粒径を表４に示す。添加物を
変化させても、結晶粒径が２０〜６０μｍであれば、優
れた耐熱衝撃性を有することがわかる。Table 4 shows the fracture rate, porosity, and crystal grain size when the firing temperature was set to 1100 ° C. and the additive amounts of the additives (Bi2O3, PbO, SiO2) were changed. It can be seen that, even if the additive is changed, if the crystal grain size is 20 to 60 μm, it has excellent thermal shock resistance.
【００１７】[0017]
【表４】 [Table 4]
【００１８】[0018]
【発明の効果】本発明は、耐熱衝撃性に優れ、強度及び
電磁気特性も優れたフェライト材料を提供するものであ
る。従って、ハンダ槽、ハンダごて等により熱を直接受
けるリードピン電極付のドラムコア、チップインダクタ
等用のフェライト材料として、極めて有用であり、これ
らの部品の小型化・ＳＭＤ化に対応できる。又、フェラ
イト板に回路パターンを印刷したフェライト基板等に応
用することも可能であり、各製品の製造歩留を向上し、
コストを低減することができる。INDUSTRIAL APPLICABILITY The present invention provides a ferrite material having excellent thermal shock resistance, strength and electromagnetic characteristics. Therefore, it is extremely useful as a ferrite material for a lead core electrode-equipped drum core, a chip inductor, etc., which is directly subjected to heat by a solder bath, a soldering iron, etc., and can be applied to downsizing and SMD of these parts. It is also possible to apply it to a ferrite substrate with a circuit pattern printed on a ferrite plate, improving the manufacturing yield of each product,
The cost can be reduced.
【図１】結晶粒径と熱衝撃による破壊率との関係を示す
グラフである。FIG. 1 is a graph showing a relationship between a crystal grain size and a thermal shock destruction rate.
Claims (3)
Ｏを１０〜３５ｍｏｌ％、ＣｕＯを３〜１０ｍｏｌ％、
残部ＮｉＯからなるフェライト材料に、Ｂｉ２Ｏ３、Ｐ
ｂＯの少なくとも１種類を０．０３〜２ｗｔ％含み、空
孔率が５％以下で、その結晶組織の平均粒径が２０〜６
０μｍであることを特徴とする耐熱衝撃フェライト材
料。1. Fe2O3 40 to 50 mol%, Zn
O is 10 to 35 mol%, CuO is 3 to 10 mol%,
Bi2O3, P on the ferrite material consisting of the balance NiO
It contains at least one type of bO in an amount of 0.03 to 2 wt% and has a porosity of 5% or less and an average grain size of its crystal structure of 20 to 6
A thermal shock resistant ferrite material characterized by being 0 μm.
の多くとも１／２が、ＭｇＯ及び／又は（１／４）（Ｌ
ｉ２Ｏ＋Ｆｅ２Ｏ３）及び／又はＭｎ酸化物に置換され
ていることを特徴とする耐熱衝撃フェライト材料。2. The NiO according to claim 1
At most 1/2 is MgO and / or (1/4) (L
i2O + Fe2O3) and / or Mn oxide.
2を０〜１ｗｔ％（但し、０ｗｔ％を含まない）添加し
たことを特徴とする耐熱衝撃フェライト材料。3. In claim 1, SiO 2
A thermal shock-resistant ferrite material, wherein 2 is added in an amount of 0 to 1 wt % (excluding 0 wt%) .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3122156A JPH0732095B2 (en) | 1991-04-23 | 1991-04-23 | Thermal shock resistant ferrite material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3122156A JPH0732095B2 (en) | 1991-04-23 | 1991-04-23 | Thermal shock resistant ferrite material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04323806A JPH04323806A (en) | 1992-11-13 |
| JPH0732095B2 true JPH0732095B2 (en) | 1995-04-10 |
Family
ID=14828988
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3122156A Expired - Fee Related JPH0732095B2 (en) | 1991-04-23 | 1991-04-23 | Thermal shock resistant ferrite material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0732095B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI303073B (en) | 2003-09-03 | 2008-11-11 | Tdk Corp | Ferrite material, ferrite sintered body, and inductor |
| KR102463333B1 (en) * | 2017-10-24 | 2022-11-04 | 삼성전기주식회사 | Coil Electronic Component |
| JP7227736B2 (en) * | 2018-11-07 | 2023-02-22 | 日本特殊陶業株式会社 | dust core |
| JP7227737B2 (en) * | 2018-11-07 | 2023-02-22 | 日本特殊陶業株式会社 | dust core |
-
1991
- 1991-04-23 JP JP3122156A patent/JPH0732095B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04323806A (en) | 1992-11-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2674623B2 (en) | Magnetic material for high frequency | |
| JPH09306716A (en) | Sintered ferrite material and manufacture thereof | |
| JP2002104873A (en) | Frrite material and ferrite substrate and electromagnetic wave absorbing member using it | |
| JPH0732095B2 (en) | Thermal shock resistant ferrite material | |
| JP3492802B2 (en) | Low loss ferrite material | |
| JPH01103953A (en) | Thermal shock resistant ferrite material | |
| JP3201529B2 (en) | Thermal shock resistant ferrite material | |
| JPH08325056A (en) | Ferrite material | |
| EP1231614A1 (en) | Oxide magnetic material and core using the same | |
| JP7238511B2 (en) | Ni-based ferrite and coil parts using the same | |
| JPH08157253A (en) | High strength ferrite, ferrite substrate using the same and electromagnetic wave absorbing member | |
| JP3426780B2 (en) | Ferrite material | |
| JPH0521222A (en) | Manufacture of nickel-zinc ferrite | |
| JP2727579B2 (en) | Low loss ferrite | |
| JPH08133826A (en) | Thermal shock-resistant ferrite material and ferrite core using thereof | |
| JP4631348B2 (en) | Ni-Zn-Cu ferrite material and inductor element | |
| JP3570825B2 (en) | Ferrite core | |
| JPH0391209A (en) | Chip inductor | |
| JPH07133150A (en) | Magnetic material for chip parts | |
| JPH097816A (en) | Ni-cu-zn system oxide magnetic material | |
| JP2802839B2 (en) | Oxide soft magnetic material | |
| JPH0366254B2 (en) | ||
| JPH06333719A (en) | Ni-zn soft ferrite | |
| JP7221751B2 (en) | Magnetic materials and laminated chip components | |
| US3066102A (en) | Ferrite containing neodymium |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090410 Year of fee payment: 14 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090410 Year of fee payment: 14 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100410 Year of fee payment: 15 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110410 Year of fee payment: 16 |
|
| LAPS | Cancellation because of no payment of annual fees |