JPH11255558A - Production of manganese-zinc-based ferrite core - Google Patents
Production of manganese-zinc-based ferrite coreInfo
- Publication number
- JPH11255558A JPH11255558A JP10185769A JP18576998A JPH11255558A JP H11255558 A JPH11255558 A JP H11255558A JP 10185769 A JP10185769 A JP 10185769A JP 18576998 A JP18576998 A JP 18576998A JP H11255558 A JPH11255558 A JP H11255558A
- Authority
- JP
- Japan
- Prior art keywords
- mol
- based ferrite
- ferrite core
- producing
- ions
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/20—Circuits for coupling gramophone pick-up, recorder output, or microphone to receiver
- H04B1/205—Circuits for coupling gramophone pick-up, recorder output, or microphone to receiver with control bus for exchanging commands between units
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
- H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
- H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/64—Automatic arrangements for answering calls; Automatic arrangements for recording messages for absent subscribers; Arrangements for recording conversations
- H04M1/65—Recording arrangements for recording a message from the calling party
- H04M1/656—Recording arrangements for recording a message from the calling party for recording conversations
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
- H04M11/02—Telephonic communication systems specially adapted for combination with other electrical systems with bell or annunciator systems
- H04M11/025—Door telephones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R5/00—Stereophonic arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/26—Devices for calling a subscriber
- H04M1/27—Devices whereby a plurality of signals may be stored simultaneously
- H04M1/271—Devices whereby a plurality of signals may be stored simultaneously controlled by voice recognition
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/57—Arrangements for indicating or recording the number of the calling subscriber at the called subscriber's set
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/64—Automatic arrangements for answering calls; Automatic arrangements for recording messages for absent subscribers; Arrangements for recording conversations
- H04M1/65—Recording arrangements for recording a message from the calling party
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はＭｎ−Ｚｎ系のフェ
ライトコア（ｆｅｒｒｉｔｅ ｃｏｒｅ）の製造方法に
関し、更に詳細には効果的にＴｉ＋４イオンを添加して
比抵抗値を増加させることにより、高周波で低い電力消
費を有するようにしたＭｎ−Ｚｎ系のフェライトコアの
製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a Mn-Zn ferrite core, and more particularly, to a method of effectively adding Ti + 4 ions to increase the specific resistance to increase the high frequency. The present invention relates to a method for producing a Mn-Zn based ferrite core having low power consumption.
【０００２】[0002]
【従来の技術】磁性材料としてのフェライトコア（ｆｅ
ｒｒｉｔｅ ｃｏｒｅ）の特性には高い初期透磁率、低
い電力損失係数、大きな飽和磁束密度が要求される。し
かし、この３つの特性を全部満たすには限界があるた
め、用途に応じて組成を異にするフェライトを用いてい
る。５００ｋＨｚ以上且つ２ＭＨｚ以下の周波数範囲で
の低電力損失の用途としては５１〜５４モル％のＦｅ２
Ｏ３、３２〜３９モル％のＭｎＯ、６〜１４モル％のＺ
ｎＯの組成範囲を有するＭｎ−Ｚｎ系のフェライトコア
（Ｍｎ−Ｚｎ ｆｅｒｒｉｔｅ ｃｏｒｅ）を主として
用いる。一般に、５００ｋＨｚ以上の使用周波数の場合
には渦電流に起因する電力損失が急に増加するが、この
ような渦電流に起因する電力損失を減少させるためには
Ｍｎ−Ｚｎ系のフェライトの比抵抗値を増加させる必要
がある。これまで、様々な添加剤が試片の比抵抗値を高
めるために使用されている。Ｔｉ４＋は、前記Ｍｎ−Ｚ
ｎのフェライトの比抵抗を増加させるための代表的な物
質のうちの一つであり、Ｍｎ−Ｚｎ系のフェライトの主
な電気伝導機構であるＦｅ２＋イオンとＦｅ３＋イオン
間の電子移動を抑制する作用をする。2. Description of the Related Art A ferrite core (fe) as a magnetic material is used.
The characteristics of the “write core” require a high initial magnetic permeability, a low power loss coefficient, and a large saturation magnetic flux density. However, since there is a limit in satisfying all three characteristics, ferrites having different compositions according to the application are used. For low power loss applications in the frequency range of 500 kHz or more and 2 MHz or less, 51 to 54 mol% of Fe 2
O 3 , 32-39 mol% MnO, 6-14 mol% Z
An Mn-Zn ferrite core having a composition range of nO is mainly used. Generally, at an operating frequency of 500 kHz or more, the power loss due to the eddy current sharply increases. You need to increase the value. To date, various additives have been used to increase the resistivity of the coupon. Ti 4+ is the Mn-Z
n is one of the typical materials for increasing the specific resistance of ferrite of n, and suppresses electron transfer between Fe 2+ ions and Fe 3+ ions, which is the main electric conduction mechanism of Mn—Zn ferrite. To act.
【０００３】従来のＭｎ−Ｚｎ系のフェライトコアは、
Ｔｉ４＋イオンの原料としてＴｉＯ２形態の粉末を混合
する過程で添加する。前記添加されたＴｉ４＋イオン
が、効果的に試片の比抵抗を増加させ且つ電力損失（ｐ
ｏｗｅｒ ｌｏｓｓ）を減少させるためには、Ｔｉ４＋
イオンがＦｅ３＋イオンに代わって置換してＭｎ−Ｚｎ
のフェライトの結晶格子内に固溶され、Ｆｅ２＋イオン
とＦｅ３＋イオンとの間の電子移動を抑制して抵抗を増
加させなければならない。A conventional Mn-Zn ferrite core is
It is added in the process of mixing TiO 2 form powder as a source of Ti 4+ ions. The added Ti 4+ ions effectively increase the specific resistance of the specimen and reduce the power loss (p
In order to reduce the power loss, Ti 4+
Mn-Zn is replaced by Fe 3+ ions instead of ions.
Must be dissolved in the crystal lattice of the ferrite, and the resistance must be increased by suppressing electron transfer between Fe 2+ ions and Fe 3+ ions.
【０００４】しかしながら、上記した固相法による一般
的な製造工程においては、Ｔｉ４＋イオンはＭｎ−Ｚｎ
のフェライトの結晶格子内部に均一に置換されない。こ
のため、ＴｉＯ２形態で添加されたＴｉ４＋イオンがＭ
ｎ−Ｚｎ系のフェライトのスピネル（ｓｐｉｎｅｌ）結
晶格子内に均一に置換されずに遊離された状態のまま存
する場合には、効果的に比抵抗を増加させることができ
なく、しかも不均一な微細構造を作って第２相として存
しながら初期透磁率を減少させる等の電磁気的な物性の
低下をもたらす。[0004] However, in the above-mentioned general manufacturing process by the solid phase method, Ti 4+ ions are converted to Mn-Zn.
Is not uniformly substituted within the ferrite crystal lattice. For this reason, Ti 4+ ions added in the form of TiO 2
If the n-Zn ferrite spinel crystal lattice is left in a free state without being uniformly substituted, the specific resistance cannot be effectively increased, and the non-uniform fineness cannot be increased. Electromagnetic properties such as a decrease in initial magnetic permeability while forming a structure and remaining as a second phase are brought about.
【０００５】[0005]
【発明が解決しようとする課題】本発明は上記した従来
のＭｎ−Ｚｎ系のフェライトコアの問題点を解決するた
めになされたものであり、Ｔｉ４＋イオンを焼結体の結
晶格子内に効果的に固溶させるために、今まで使用され
てきたＴｉＯ２でなく、既に原子スケールでＦｅ２＋イ
オンと結合している形態のチタン鉄酸化物を添加して、
５００ｋＨｚ以上の周波数で安定的且つ低電力損失を得
られるＭｎ−Ｚｎ系のフェライト焼結体を提供すること
をその目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the conventional Mn-Zn based ferrite core, and has an effect that Ti 4+ ions are effectively added to the crystal lattice of the sintered body. In order to form a solid solution, instead of TiO 2 which has been used so far, titanium iron oxide in a form already bonded to Fe 2+ ions on an atomic scale is added,
An object of the present invention is to provide a Mn-Zn based ferrite sintered body that can obtain a stable and low power loss at a frequency of 500 kHz or more.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
の本発明は、Ｆｅ２Ｏ３：５１〜５５モル％、ＭｎＯ、
ＭｎＯ２、Ｍｎ３Ｏ４、ＭｎＣＯ３のうち１種：３２〜
４０モル％、ＺｎＯ：６〜１４モル％に、既存に使用さ
れたＴｉＯ２でなく、チタン鉄酸化物或いはチタンマン
ガン酸化物を０．０１〜５．０重量％添加して湿式混合
及び乾燥する段階と、８００〜１１００℃の温度でか焼
する段階と、粉砕、成形の後に１１００〜１２５０℃の
温度で焼結する段階と、からなる。In order to achieve the above object, the present invention provides a method for producing Fe 2 O 3 : 51 to 55 mol%, MnO,
One of MnO 2 , Mn 3 O 4 , and MnCO 3 : 32 to
To 40 mol% and ZnO: 6 to 14 mol%, 0.01 to 5.0 wt% of titanium oxide or titanium manganese oxide is added instead of the conventionally used TiO 2 and wet mixed and dried. A step of calcining at a temperature of 800 to 1100 ° C, and a step of sintering at a temperature of 1100 to 1250 ° C after pulverization and molding.
【０００７】[0007]
【発明の実施の形態】本発明は、Ｍｎ−Ｚｎのフェライ
ト粉末にＦｅ２＋イオンと結合しているチタン鉄酸化物
又はチタンマンガン酸化物を添加して製造することによ
り、比抵抗を増加させるＴｉ４＋イオンが効果的にスピ
ネル結晶格子内に置換されて５００ｋＨｚ以上の高周波
で安定的且つ低電力損失を有するＭｎ−Ｚｎ系のフェラ
イト焼結体を得られるようになる。一般に、使用周波数
が増加すると、渦電流（ｅｄｄｙ ｃｕｒｒｅｎｔ）に
よる電力損失が指数関数的に増加することになるが、か
かる渦電流に起因する電力損失は比抵抗に反比例関係に
ある。よって、比抵抗値を増加させる場合に電力損失の
減少が可能である。BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to a method for producing a ferrite powder of Mn-Zn by adding a titanium iron oxide or a titanium manganese oxide bonded to Fe 2+ ions to increase the specific resistance. 4+ ions are effectively substituted into the spinel crystal lattice, and a Mn-Zn based ferrite sintered body having stable and low power loss at a high frequency of 500 kHz or more can be obtained. Generally, as the operating frequency increases, the power loss due to the eddy current increases exponentially. The power loss due to the eddy current is inversely proportional to the specific resistance. Therefore, when the specific resistance value is increased, the power loss can be reduced.
【０００８】本発明で用いられるチタン鉄酸化物には、
例えばＦｅＴｉＯ３（ｉｌｍｅｎｉｔｅ）を挙げられ
る。その添加量が０．０１重量％以下の場合には添加効
果を期待することができなく、５．０重量％以上の場合
には非磁性金属イオンであるＴｉ４＋イオンがその他の
電磁気的な物性を劣化させることがある。ゆえに、その
添加量は０．０１〜５．０重量％の範囲とすることが好
ましい。The titanium iron oxide used in the present invention includes:
An example is FeTiO 3 (ilmenite). When the addition amount is 0.01% by weight or less, the effect of addition cannot be expected. When the addition amount is 5.0% by weight or more, Ti 4+ ion, which is a nonmagnetic metal ion, has other electromagnetic properties. May be deteriorated. Therefore, the amount of addition is preferably in the range of 0.01 to 5.0% by weight.
【０００９】次は、実施例に基づいて説明する。 ＜実施例１＞Ｆｅ２Ｏ３：５３モル％、ＭｎＯ：３８モ
ル％（ＭｎＯはＭｎ３Ｏ４の形態を補正して使用す
る）、ＺｎＯ：９モル％とし、ここにＦｅＴｉＯ３内に
存するＴｉＯ２が主組成に対して重量比で０．５重量％
になるように添加（単に、ＦｅＴｉＯ３から提供される
Ｆｅ２＋イオンの量を勘案してＦｅ２Ｏ３の含量を補正
する）してジルコニアボール及びジャー（ｊａｒ）を用
いて湿式混合し、１０００℃の温度でか焼した後、１０
００ｐｐｍのＣａＣＯ３を添加してボールミールで湿式
粉砕する。そして、０．７重量％のＰＶＡ、０．７重量
％のＰＥＧを添加した後、噴霧乾燥機を用いて果粒化
し、１．５ｔｏｎ／ｃｍ３の圧力で外径が３ｃｍ、内径
が２ｃｍ、高さが約１ｃｍになるトロイド（ｔｏｒｏｉ
ｄ）状の成形体を製作する。Next, a description will be given based on an embodiment. <Example 1> Fe 2 O 3: 53 mol%, MnO: 38 mol% (MnO is used to correct the form of Mn 3 O 4), ZnO: 9 and a molar% resides in FeTiO 3 here TiO 2 is 0.5% by weight based on the main composition
(To simply correct the content of Fe 2 O 3 in consideration of the amount of Fe 2+ ions provided from FeTiO 3 ), and wet-mix using zirconia balls and jars, and After calcination at a temperature of
Add 00 ppm CaCO 3 and wet mill with a ball meal. Then, after adding 0.7% by weight of PVA and 0.7% by weight of PEG, the mixture is granulated using a spray dryer, and has an outer diameter of 3 cm, an inner diameter of 2 cm, and a high pressure of 1.5 ton / cm3. Toroid which becomes approximately 1cm
d) A shaped body is manufactured.
【００１０】このようにして得られるフェライトコア成
形体を焼結炉に装入する。この際、焼結の条件は３００
℃／ｈｒの昇温速度で８００℃まで昇温させ、再度２５
０℃／ｈｒで１１５０℃まで昇温させた後、１１５０℃
で３時間ぐらい維持して焼結させる。そして、５０℃／
ｈｒで冷却させる。焼結や冷却に際して雰囲気の制御
は、ｌｏｇＰＯ２＝ａ−ｂ／Ｔの平衡酸素分圧に基づい
てａ＝７．８、ｂ＝１４５４０の値を選択して制御す
る。[0010] The ferrite core compact obtained in this manner is charged into a sintering furnace. At this time, the sintering condition is 300
The temperature was raised to 800 ° C. at a rate of
After raising the temperature to 1150 ° C at 0 ° C / hr, 1150 ° C
And sintering for about 3 hours. And 50 ° C /
Allow to cool at hr. The atmosphere is controlled at the time of sintering and cooling by selecting values of a = 7.8 and b = 14540 based on the equilibrium oxygen partial pressure of logPO 2 = ab / T.
【００１１】＜実施例２＞Ｆｅ２Ｏ３：５３モル％、Ｍ
ｎＯ：３８モル％（ＭｎＯはＭｎ３Ｏ４の形態を補正し
て使用する）、ＺｎＯ：９モル％とし、ここにＦｅＴｉ
Ｏ３内に存するＴｉＯ２が主組成に対して重量比で１重
量％になるように添加（単に、ＦｅＴｉＯ３から提供さ
れるＦｅ２＋イオンの量を勘案してＦｅ２Ｏ３の含量を
補正する）する。これ以外の条件は実施例１と同様にし
て行う。Example 2 Fe 2 O 3 : 53 mol%, M
nO: 38 mol% (MnO is used after correcting the form of Mn 3 O 4 ), ZnO: 9 mol%, and FeTi
TiO 2 in O 3 is added so that the weight ratio of TiO 2 to the main composition is 1% by weight (the content of Fe 2 O 3 is corrected simply in consideration of the amount of Fe 2+ ions provided from FeTiO 3) Do). Other conditions are the same as in the first embodiment.
【００１２】＜比較例１＞Ｆｅ２Ｏ３：５３モル％、Ｍ
ｎＯ：３８モル％（ＭｎＯはＭｎ３Ｏ４の形態を補正し
て使用する）、ＺｎＯ：９モル％とし、ここに添加剤と
してのＴｉＯ２を重量比で０．５重量％添加する。これ
以外の条件は実施形態１と同様にして行う。 ＜比較例２＞Ｆｅ２Ｏ３：５３モル％、ＭｎＯ：３８モ
ル％（ＭｎＯはＭｎ３Ｏ４の形態を補正して使用す
る）、ＺｎＯ：９モル％とし、ここに添加剤としてのＴ
ｉＯ２を重量比で１重量％添加する。これ以外の条件は
実施例１と同様にして行う。Comparative Example 1 Fe 2 O 3 : 53 mol%, M
nO: 38 mol% (MnO is used after correcting the form of Mn 3 O 4 ), ZnO: 9 mol%, and TiO 2 as an additive is added thereto in a weight ratio of 0.5 wt%. Other conditions are the same as in the first embodiment. <Comparative Example 2> Fe 2 O 3: 53 mol%, MnO: 38 mol% (MnO is used to correct the form of Mn 3 O 4), ZnO: 9 and a molar%, T as additives here
1% by weight of iO 2 is added. Other conditions are the same as in the first embodiment.
【００１３】上記実施例と比較例の実施結果を表１に示
す。Table 1 shows the results of the above Examples and Comparative Examples.
【表１】 以上のように、本発明は、添加剤としてＦｅＴｉＯ
３（ｉｌｍｅｎｉｔｅ）を添加することにより、高周波
数で低い電力損失を有するフェライト焼結体を製造する
ことができる。[Table 1] As described above, the present invention provides a method for producing FeTiO
By adding 3 (ilmenite), a ferrite sintered body having high frequency and low power loss can be manufactured.
【００１４】[0014]
【発明の効果】上述したように、本発明は、Ｆｅ
２Ｏ３、ＭｎＯ、ＺｎＯの混合物にチタン鉄酸化物又は
チタンマンガン酸化物を添加して粉末焼結法で製造する
ことにより、比抵抗を増加させるＴｉ４＋イオンが効果
的にスピネル（ｓｐｉｎｅｌ）結晶格子内に均一に置換
されて高周波領域で安定的且つ低い電力損失を有するＭ
ｎ−Ｚｎ系のフェライト焼結体を得ることができる。こ
れにより、各種の電気及び電子分野の磁性材料として幅
広く用いることができる。As described above, according to the present invention, Fe
By adding a titanium iron oxide or a titanium manganese oxide to a mixture of 2 O 3 , MnO, and ZnO and manufacturing the mixture by a powder sintering method, Ti 4+ ions, which increase the specific resistance, are effectively converted into spinel crystals. M which is uniformly substituted in the lattice and has stable and low power loss in the high frequency range
An n-Zn ferrite sintered body can be obtained. Thereby, it can be widely used as a magnetic material in various electric and electronic fields.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 ショ ジョン ズ 大韓民国、キョンキ−ド、アンヤン−シ、 ドンアン−グ、ゴアンヤン−ドン、1587− ５、ションイル アパートメント207−909 (72)発明者 シン ミョン シン 大韓民国、キョンキ−ド、ソンナム−シ、 ブンダン−グ、スナイ−ドン、77、プレム −マウル、 603−302 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shojongs Korea, Gyeonggi-do, Anyang-shi, Dong An-gu, Goan Yang-dong, 1587-5, Sho-Il Apartment 207-909 (72) Inventor Shin Myung Shin South Korea, Gyeonggi-do, Seongnam-si, Bundang-gu, Snai-dong, 77, Prem-maul, 603-302
Claims (2)
Ｏ、ＭｎＯ２、Ｍｎ３Ｏ４、ＭｎＣＯ３のうち１種：３
２〜４０モル％、ＺｎＯ：６〜１４モル％に、チタン鉄
酸化物或いはチタンマンガン酸化物を０．０１〜５．０
重量％添加して湿式混合及び乾燥する段階と、 ８００〜１１００℃の温度でか焼（ｃａｌｃｉｎａｔｉ
ｏｎ）する段階と、 粉砕、成形の後、１１００〜１２５０℃の温度で焼結す
る段階と、 からなることを特徴とするＭｎ−Ｚｎ系のフェライトコ
ア（Ｍｎ−Ｚｎ ｆｅｒｒｉｔｅ ｃｏｒｅ）の製造方
法。1. Fe 2 O 3 : 51 to 55 mol%, Mn
One of O, MnO 2 , Mn 3 O 4 , and MnCO 3 : 3
2 to 40 mol%, ZnO: 6 to 14 mol%, and titanium iron oxide or titanium manganese oxide in 0.01 to 5.0 mol%.
Weight mixing and wet mixing and drying; calcinati at a temperature of 800 to 1100 ° C.
on), and after crushing and forming, sintering at a temperature of 1100 to 1250 ° C., a method for producing a Mn—Zn ferrite core.
ｅｎｉｔｅ）であることを特徴とする請求項１に記載の
Ｍｎ−Ｚｎ系のフェライトコアの製造方法。2. Titanium iron oxide is FeTiO 3 (ilm
2. The method for producing a Mn—Zn-based ferrite core according to claim 1, wherein
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019980008134A KR19990074502A (en) | 1998-03-11 | 1998-03-11 | Multifunction audio system |
| KR8134/1998 | 1998-03-11 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2935219B1 JP2935219B1 (en) | 1999-08-16 |
| JPH11255558A true JPH11255558A (en) | 1999-09-21 |
Family
ID=19534600
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| JP10185769A Expired - Fee Related JP2935219B1 (en) | 1998-03-11 | 1998-07-01 | Method for producing Mn-Zn ferrite core |
| JP11062422A Pending JP2000092167A (en) | 1998-03-11 | 1999-03-09 | Multifunctional audio system and its control method |
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| JP11062422A Pending JP2000092167A (en) | 1998-03-11 | 1999-03-09 | Multifunctional audio system and its control method |
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|---|---|
| JP (2) | JP2935219B1 (en) |
| KR (1) | KR19990074502A (en) |
| CN (1) | CN1234678A (en) |
| DE (1) | DE19901376A1 (en) |
| FR (1) | FR2778048A1 (en) |
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|---|---|---|---|---|
| CN100426768C (en) * | 2004-12-16 | 2008-10-15 | 智捷科技股份有限公司 | Wireless network transmission transmitter and receiver and method for establishing wireless network transmission |
| JP4781015B2 (en) | 2005-06-03 | 2011-09-28 | パウダーテック株式会社 | Ferrite carrier core material for electrophotography, ferrite carrier for electrophotography, production method thereof, and developer for electrophotography using the ferrite carrier |
| US8995240B1 (en) * | 2014-07-22 | 2015-03-31 | Sonos, Inc. | Playback using positioning information |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5363434A (en) * | 1991-01-09 | 1994-11-08 | Square D Company | Audio distribution system |
| US5243640A (en) * | 1991-09-06 | 1993-09-07 | Ford Motor Company | Integrated cellular telephone and vehicular audio system |
| JPH07210191A (en) * | 1994-01-24 | 1995-08-11 | Matsushita Electric Works Ltd | Voice recognition system for ketchen |
| GB9617264D0 (en) * | 1996-08-16 | 1996-09-25 | Thwaite Paul | Improvements relating to means of controlling different apparatus |
| EP0971175A3 (en) * | 1998-06-18 | 2000-07-19 | Ncr International Inc. | Kitchen appliance |
-
1998
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-
1999
- 1999-01-15 DE DE19901376A patent/DE19901376A1/en not_active Withdrawn
- 1999-03-09 JP JP11062422A patent/JP2000092167A/en active Pending
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Also Published As
| Publication number | Publication date |
|---|---|
| CN1234678A (en) | 1999-11-10 |
| KR19990074502A (en) | 1999-10-05 |
| JP2000092167A (en) | 2000-03-31 |
| JP2935219B1 (en) | 1999-08-16 |
| DE19901376A1 (en) | 1999-09-16 |
| FR2778048A1 (en) | 1999-10-29 |
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