JPH05308016A - Ferrite paste and manufacture thereof - Google Patents

Ferrite paste and manufacture thereof

Info

Publication number
JPH05308016A
JPH05308016A JP4736492A JP4736492A JPH05308016A JP H05308016 A JPH05308016 A JP H05308016A JP 4736492 A JP4736492 A JP 4736492A JP 4736492 A JP4736492 A JP 4736492A JP H05308016 A JPH05308016 A JP H05308016A
Authority
JP
Japan
Prior art keywords
ferrite
paste
sol
mixed
particles
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.)
Withdrawn
Application number
JP4736492A
Other languages
Japanese (ja)
Inventor
Shingo Katayama
真吾 片山
Kenichi Tanigawa
健一 谷川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP4736492A priority Critical patent/JPH05308016A/en
Publication of JPH05308016A publication Critical patent/JPH05308016A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/14Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for applying magnetic films to substrates
    • H01F41/16Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for applying magnetic films to substrates the magnetic material being applied in the form of particles, e.g. by serigraphy, to form thick magnetic films or precursors therefor

Abstract

PURPOSE:To achieve a sintering density of 90% or higher at a temperature of 900 deg.C or below and prevent cracks from occurring in drying after printing by limiting the weight ratio of ferrite grains different in average grain size to a specified range. CONSTITUTION:A ferrite paste is composed of a mixture of a ferrite grain with an average size of 1-30mum (A) and that with an average size of 5-50mum (B) with the weight ratio of A:B limited to the range of 95:5-20:80. A 0.1-4.0M alcohol solution with dissolved nitrates of the component metals is conditioned by heating and circulating to obtain a ferrite sol. Oxides or carbonates of the component metals are conditioned by repeating mixing, calcinating and grinding cycles to obtain a ferrite powder. The ferrite powder is mixed into the ferrite sol, and the resultant mixture is condensed until the ferrite content falls in the range of 40-90wt% to obtain the ferrite paste. The simple method for ferrite paste manufacture provides evenly mixed ferrite grains.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、スクリーン印刷等によ
るフェライト膜の作製において用いられるフェライトペ
ーストとそ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 ferrite paste used for producing a ferrite film by screen printing and a method for producing the same.

【0002】[0002]

【従来の技術】近年、IC化・LSI化の進展に伴っ
て、コンデンサーをはじめとする各種素子のチップ化、
超小形化、薄形化が進んできた。磁性材料が利用される
インダクタやトランスにおいても、小形化やチップ化が
進む一方、薄形化の開発が進められている。薄形化され
たインダクタやトランスの磁性層としてフェライト膜が
利用できる。フェライト膜の作製は、フェライトペース
トをスクリーン印刷等により基板に印刷された後、乾燥
・焼成して作製される。スクリーン印刷に用いられるフ
ェライトペーストは、酸化物を混合し、仮焼・粉砕を繰
り返して調製したフェライト粉末をバインダーや溶剤と
混ぜ合わせることにより作製される。
2. Description of the Related Art In recent years, with the progress of IC and LSI, various elements such as capacitors have been made into chips,
Miniaturization and thinning have advanced. With regard to inductors and transformers that use magnetic materials, miniaturization and chip development are progressing, while thinning is being developed. A ferrite film can be used as a magnetic layer of thinned inductors and transformers. The ferrite film is produced by printing a ferrite paste on a substrate by screen printing or the like, and then drying and firing. The ferrite paste used for screen printing is prepared by mixing oxides and mixing ferrite powder prepared by repeating calcination and pulverization with a binder and a solvent.

【0003】[0003]

【発明が解決しようとする課題】従来のフェライトペー
ストは、仮焼・粉砕を繰り返して作製されるため、必然
的に1μm程度の大きな粒径のフェライト粉末であっ
た。そのために、90%以上の密度を得るには1000
℃以上の焼成温度が必要となり、例えば、960℃の融
点をもつ銀の配線を施した基板にはフェライト膜が作製
できなかった。硝酸塩から調製したフェライトゾルを濃
縮して作製した微細なフェライト粒子から成るフェライ
トペーストでは、低い温度で焼成しても緻密なフェライ
ト膜が作製できるが、印刷後の乾燥時にクラックが生じ
易くなる。特に、膜が厚くなればなるほど、その傾向が
著しくなり、歩留が悪い。
Since the conventional ferrite paste is produced by repeating calcination and pulverization, it is inevitably a ferrite powder having a large particle size of about 1 μm. Therefore, to obtain a density of 90% or more, 1000
A firing temperature of ℃ or more was required, and for example, a ferrite film could not be formed on a substrate provided with silver wiring having a melting point of 960 ° C. With a ferrite paste composed of fine ferrite particles produced by concentrating a ferrite sol prepared from nitrate, a dense ferrite film can be produced even if fired at a low temperature, but cracks are likely to occur during drying after printing. In particular, the thicker the film, the more prominent this tendency is and the poorer the yield.

【0004】本発明は、上記課題を解決するために創案
したものであり、900℃以下の温度で90%以上の密
度に焼成でき、しかも印刷後の乾燥時にクラックが生じ
難いフェライトペースト及びその製造方法を提供するこ
とを目的とする。
The present invention was devised to solve the above-mentioned problems, and a ferrite paste that can be fired at a temperature of 900 ° C. or less to a density of 90% or more and that cracks hardly occur during drying after printing, and its production. The purpose is to provide a method.

【0005】[0005]

【課題を解決するための手段】前記目的を達成するため
に、本発明のフェライトペーストでは、1〜30μmの
平均粒径のフェライト粒子(A)と5〜50nmの平均粒
径のフェライト粒子(B)の混合粒子を含有し、その重
量比がA:B=95:5〜20:80の範囲にする。
In order to achieve the above object, in the ferrite paste of the present invention, the ferrite particles (A) having an average particle size of 1 to 30 μm and the ferrite particles (B) having an average particle size of 5 to 50 nm are used. ), And the weight ratio thereof is in the range of A: B = 95: 5 to 20:80.

【0006】本発明において、フェライトとは酸化鉄及
び鉄イオンと鉄以外の金属イオンとで構成される酸化物
である。後者の例としては、MO・xFe2 3 (Mに
はBa,Sr,Pbが1種類あるいは2種類以上が含ま
れる。),MFe2 4 (MにはMn,Co,Ni,C
u,Mg,Zu,Liが1種類あるいは2種類以上が含
まれる。),R3 Fe5 12(RにはY,Gd等の希土
類元素が1種類あるいは2種類以上が含まれる。Fe3+
の一部がAl3+で置換されてもよい。)等が挙げられ
る。本発明のペーストとは、液体と固体粒子の混合物で
あり、液体中の粒子が沈降・分離しないものである。ま
た、ペースト化とは、前記ペーストの状態にすることで
ある。
In the present invention, ferrite is an oxide composed of iron oxide and iron ions and metal ions other than iron. Examples of the latter include MO.xFe 2 O 3 (M includes one kind or two or more kinds of Ba, Sr, and Pb) and MFe 2 O 4 (M includes Mn, Co, Ni, and C).
u, Mg, Zu, and Li are included in one kind or two or more kinds. ), R 3 Fe 5 O 12 (R contains one or more rare earth elements such as Y and Gd. Fe 3+
May be partially replaced with Al 3+ . ) And the like. The paste of the present invention is a mixture of liquid and solid particles, in which particles in the liquid do not settle and separate. In addition, “pasting” means making the paste state.

【0007】フェライト粒子(A)については、平均粒
径1〜30μmの範囲が好ましい。30μmを超えると
900℃以下では90%以上の密度に焼成することが難
しくなる。一方、1μmより小さい平均粒径のフェライ
トはフェライト粒子(B)の粒径に近くなるため、微細
粒子のみから成るフェライトペーストと同じようにな
る。このようなフェライトペーストでは、印刷後の乾燥
時にクラックが生じ易い。
The ferrite particles (A) preferably have an average particle size of 1 to 30 μm. If it exceeds 30 μm, it becomes difficult to fire it at a density of 90% or more at 900 ° C. or less. On the other hand, since ferrite having an average particle size smaller than 1 μm is close to the particle size of the ferrite particles (B), it is the same as the ferrite paste composed of only fine particles. With such a ferrite paste, cracks are likely to occur during drying after printing.

【0008】フェライト粒子(B)については、平均粒
径5〜50nmの範囲が好ましい。50nmを超えると90
0℃以下では90%以上の密度に焼成することが難しく
なり、一方、5nmより小さい平均粒径のフェライトで
は、凝集し易くなるため、均一に分散したペーストを作
製するのが著しく困難となる。
The ferrite particles (B) preferably have an average particle size of 5 to 50 nm. 90 when 50 nm is exceeded
At 0 ° C. or lower, it is difficult to fire to a density of 90% or higher, and on the other hand, ferrite having an average particle size of less than 5 nm is likely to agglomerate, which makes it extremely difficult to prepare a uniformly dispersed paste.

【0009】フェライト粒子(A)と(B)の混合比に
ついては、重量比でA:B=95:5〜20:80の範
囲が好ましい。A:B=95:5よりフェライト粒子
(A)の割合が大きくなると、900℃以下では90%
以上の密度に焼成することが難しい。A:B=20:8
0よりフェライト粒子(B)の割合が大きくなると印刷
後の乾燥時にクラックが入り易くなる。
The mixing ratio of the ferrite particles (A) and (B) is preferably A: B = 95: 5 to 20:80 by weight. When the ratio of ferrite particles (A) is larger than A: B = 95: 5, 90% at 900 ° C. or lower
It is difficult to burn to the above density. A: B = 20: 8
If the proportion of the ferrite particles (B) is larger than 0, cracks are likely to occur during drying after printing.

【0010】そして、本発明のフェライトペーストは、
構成金属の硝酸塩を溶解させた0.1〜4.0Mのアル
コール溶液を加熱還流して調製したフェライトゾルに、
構成金属の酸化物もしくは炭酸塩を混合・仮焼・粉砕を
繰り返して調製したフェライト粉末を加えて混合する。
前記フェライト粉末とフェライトゾルの混合物をフェラ
イト含有量40〜90wt%の範囲に濃縮して製造でき
る。
The ferrite paste of the present invention is
To a ferrite sol prepared by heating and refluxing a 0.1-4.0 M alcohol solution in which nitrates of constituent metals are dissolved,
Ferrite powder prepared by repeating mixing, calcination and crushing of oxides or carbonates of constituent metals is added and mixed.
A mixture of the ferrite powder and the ferrite sol may be concentrated to a ferrite content in the range of 40 to 90 wt%.

【0011】本発明のフェライトペーストの製造方法に
おいて、使用するアルコールは特に限定しないが、たと
えば、メタノール、エタノール、ブタノール、プロパノ
ール、メトキシエタノール、エトキシエタノール、エチ
レングリコール、シクロヘキサノール等が挙げられる。
また、1種類あるいは2種類以上の混合したアルコール
を使用してもよく、製造過程で、アルコールに有機結合
剤、可塑剤、有機溶媒等を添加してもよい。
In the method for producing the ferrite paste of the present invention, the alcohol used is not particularly limited, but examples thereof include methanol, ethanol, butanol, propanol, methoxyethanol, ethoxyethanol, ethylene glycol and cyclohexanol.
Further, one kind or a mixture of two or more kinds of alcohols may be used, and an organic binder, a plasticizer, an organic solvent or the like may be added to the alcohol during the production process.

【0012】ここで、硝酸塩の濃度としては、0.1〜
4.0Mが好ましい。4.0Mを超えるような濃度につ
いては、完全に硝酸塩を溶解できなかったり、硝酸塩を
溶解するために長時間を要したりする。一方、0.1M
より低い濃度については、濃縮するために留去しなけれ
ばならないアルコール量が極めて多くなり、濃縮するた
めに非常に時間がかかり現実的ではない。濃縮の方法と
しては、常圧蒸留、減圧蒸留等がある。
Here, the concentration of nitrate is 0.1-0.1%.
4.0M is preferred. If the concentration exceeds 4.0 M, it may not be possible to completely dissolve the nitrate, or it may take a long time to dissolve the nitrate. On the other hand, 0.1M
For lower concentrations, the amount of alcohol that has to be distilled off in order to concentrate is very large, which is very time consuming and impractical to concentrate. Examples of the concentration method include atmospheric distillation and vacuum distillation.

【0013】フェライトペーストに含まれるフェライト
の含有量としては、40〜90wt%の範囲が好ましい。
90wt%を超えると、ペーストの粘度が高くなり、スク
リーン印刷が不可能になる。一方、40wt%より小さい
と、乾燥・焼成するときに多量の有機物が蒸発や分解し
てフェライトの緻密化を妨げる。
The content of ferrite contained in the ferrite paste is preferably in the range of 40 to 90 wt%.
When it exceeds 90 wt%, the viscosity of the paste becomes high and screen printing becomes impossible. On the other hand, if it is less than 40 wt%, a large amount of organic substances are evaporated or decomposed during drying and firing, which hinders the densification of ferrite.

【0014】[0014]

【作用】前記のフェライトペーストを使用すれば、フェ
ライト膜を900℃以下の低い焼成温度で製造できるた
め、銀等の導体を配線した基板にフェライト膜を作製す
ることが可能になる。さらに、フェライトを印刷して乾
燥する際に、クラックがほとんど生じない。前記のフェ
ライトペーストの製造方法によれば、900℃以下の低
い温度で焼成できしかも印刷後の乾燥時にクラックが発
生し難い、平均粒径の異なる2種類の混合フェライト粒
子から成るフェライトペーストが簡単に製造できる。
When the above-mentioned ferrite paste is used, the ferrite film can be manufactured at a low firing temperature of 900 ° C. or lower, so that the ferrite film can be formed on the substrate on which the conductor such as silver is wired. Furthermore, when ferrite is printed and dried, cracks hardly occur. According to the above-mentioned method for producing a ferrite paste, a ferrite paste composed of two kinds of mixed ferrite particles having different average particle diameters can be easily fired at a low temperature of 900 ° C. or less and cracks hardly occur during drying after printing. Can be manufactured.

【0015】[0015]

【実施例】本発明におけるフェライトペーストの製造方
法と、それによって得られたフェライトペーストについ
て以下の実施例によって具体的に説明する。ただし、本
発明は、これらの実施例のみに限定されるものではな
い。
EXAMPLES The method for producing a ferrite paste according to the present invention and the ferrite paste obtained thereby will be specifically described with reference to the following examples. However, the present invention is not limited to these examples.

【0016】(実施例1) (A)酸化ニッケル、酸化銅、酸化亜鉛、酸化鉄をN
i:Cu:Zn:Fe=0.033:0.083:0.
217:0.667のモル比で混合し、1100〜13
00℃、5時間仮焼して粉砕する。これを3回繰り返
し、表1のような平均粒径のフェライト粉末を調製す
る。 (B)硝酸ニッケル、硝酸銅、硝酸亜鉛、硝酸鉄を
(A)と同様のモル比でエタノールに溶解し、金属濃度
を0.1〜4.0Mにする。この硝酸塩溶液を5時間加
熱還流し、表1のような平均粒径のフェライト粒子から
成るフェライトゾルを調製する。
(Example 1) (A) Nickel oxide, copper oxide, zinc oxide, iron oxide N
i: Cu: Zn: Fe = 0.033: 0.083: 0.
217: 0.667 molar ratio, 1100-13
It is calcined at 00 ° C. for 5 hours and crushed. This is repeated 3 times to prepare a ferrite powder having an average particle size as shown in Table 1. (B) Nickel nitrate, copper nitrate, zinc nitrate, and iron nitrate are dissolved in ethanol at the same molar ratio as in (A), and the metal concentration is adjusted to 0.1 to 4.0M. This nitrate solution is heated under reflux for 5 hours to prepare a ferrite sol composed of ferrite particles having an average particle size as shown in Table 1.

【0017】表1のようなフェライトの重量比で、
(B)のゾル溶液に(A)の粉末を加える。この後、加
熱し、フェライト含有量が60wt%になるまで溶媒を蒸
発させて、フェライトペーストが得られる。このフェラ
イトペーストを銀の導体を印刷したセラミックス基板に
スクリーン印刷して、150℃で15分乾燥し、表1の
温度で1時間焼成する。表1のように、(A):(B)
=95:5〜20:80では、密度90%以上のNi−
Cu−Zn系フェライト膜が得られた。前記比率より
(A)の割合が多くなると緻密な膜が得られない。ま
た、前記比率より(B)の割合が多くなると乾燥時にク
ラックが生じる。
In the weight ratio of ferrite as shown in Table 1,
The powder of (A) is added to the sol solution of (B). After that, the ferrite paste is obtained by heating and evaporating the solvent until the ferrite content reaches 60 wt%. This ferrite paste is screen-printed on a ceramic substrate on which a silver conductor is printed, dried at 150 ° C. for 15 minutes, and fired at the temperature shown in Table 1 for 1 hour. As shown in Table 1, (A): (B)
= 95: 5 to 20:80, Ni-having a density of 90% or more
A Cu-Zn ferrite film was obtained. If the ratio of (A) is higher than the above ratio, a dense film cannot be obtained. Further, if the ratio of (B) is larger than the above ratio, cracking occurs during drying.

【0018】[0018]

【表1】 [Table 1]

【0019】(実施例2) (A)酸化マンガン、酸化亜鉛、酸化鉄をMn:Zn:
Fe=0.207:0.172:0.621のモル比で
混合し、1200〜1500℃、5時間仮焼して粉砕す
る。これを3回繰り返し、表2のような平均粒径のフェ
ライト粉末を焼成する。 (B)硝酸マンガン、硝酸亜鉛、硝酸鉄を(A)と同様
のモル比でエタノールに溶解し、金属濃度を0.1〜
4.0Mにする。この硝酸塩溶液を5時間加熱還流し、
表2のような平均粒径のフェライト粒子から成るフェラ
イトゾルを調製する。
Example 2 (A) Manganese oxide, zinc oxide, and iron oxide were added to Mn: Zn:
Fe = 0.207: 0.172: 0.621 are mixed in a molar ratio, and the mixture is calcined at 1200 to 1500 ° C for 5 hours and pulverized. This is repeated 3 times, and the ferrite powder having the average particle diameter shown in Table 2 is fired. (B) Manganese nitrate, zinc nitrate, and iron nitrate are dissolved in ethanol at the same molar ratio as in (A), and the metal concentration is 0.1 to 0.1%.
Set to 4.0M. Heat and reflux this nitrate solution for 5 hours,
A ferrite sol composed of ferrite particles having an average particle size as shown in Table 2 is prepared.

【0020】表2のようなフェライトの重量比で、
(B)のゾル溶液に(A)の粉末を加える。この後、加
熱し、フェライト含有量が50wt%になるまで溶媒を蒸
発させて、フェライトペーストが得られる。このフェラ
イトペーストをセラミックス基板にスクリーン印刷し
て、150℃で15分乾燥し、表2の温度で1時間焼成
する。表2のように、(A):(B)=95:5〜2
0:80では、密度90%以上のMn−Zn系フェライ
ト膜が得られた。前記比率より(A)の割合が多くなる
と緻密な膜が得られない。また、前記比率より(B)の
割合が多くなると乾燥時にクラックが生じる。
In the weight ratio of ferrite as shown in Table 2,
The powder of (A) is added to the sol solution of (B). Thereafter, the ferrite paste is obtained by heating and evaporating the solvent until the ferrite content becomes 50 wt%. This ferrite paste is screen-printed on a ceramic substrate, dried at 150 ° C. for 15 minutes, and fired at the temperature shown in Table 2 for 1 hour. As shown in Table 2, (A) :( B) = 95: 5-2
At 0:80, a Mn-Zn based ferrite film having a density of 90% or more was obtained. If the ratio of (A) is higher than the above ratio, a dense film cannot be obtained. Further, if the ratio of (B) is larger than the above ratio, cracking occurs during drying.

【0021】[0021]

【表2】 [Table 2]

【0022】[0022]

【発明の効果】本発明は、以上説明したように構成され
ているので、以下に記載されるような効果を奏する。フ
ェライトペーストにおいて、1〜30μmの平均粒径の
フェライト粒子(A)と5〜50nmの平均粒径のフェラ
イト粒子(B)の混合粒子を含有し、その重量比がA:
B=95:5〜20:80の範囲にすることにより、印
刷・乾燥後、900℃以下の温度で焼成できる。したが
って、従来は銀等の配線を施した基板にフェライト膜を
作製するのは非常に困難であったが、本発明のフェライ
トペーストを用いることにより、銀等の配線を施した基
板にフェライト膜を容易に作製できる。さらに、フェラ
イトを印刷して乾燥する際に、厚い膜でもクラックが生
じなくなるため、従来よりも膜厚の厚いフェライト膜の
作製が可能になる。本発明のフェライトペーストの製造
方法によれば、溶液中で前記2種類の粒子を混合するた
め、均一に混合したフェライト粒子を容易に製造でき
る。そして、フェライト粒子を混合したフェライトゾル
をそのまま濃縮することによりペースト化でき、フェラ
イトペーストの製造プロセスを簡略できる。
Since the present invention is constructed as described above, it has the following effects. The ferrite paste contains mixed particles of ferrite particles (A) having an average particle diameter of 1 to 30 μm and ferrite particles (B) having an average particle diameter of 5 to 50 nm, and the weight ratio thereof is A:
When B = 95: 5 to 20:80, it can be baked at a temperature of 900 ° C. or lower after printing and drying. Therefore, conventionally, it was very difficult to form a ferrite film on a substrate provided with wiring such as silver, but by using the ferrite paste of the present invention, a ferrite film is provided on a substrate provided with wiring such as silver. Easy to make. Further, when the ferrite is printed and dried, cracks do not occur even in a thick film, so that it is possible to manufacture a ferrite film having a larger film thickness than in the past. According to the method for producing a ferrite paste of the present invention, since the two types of particles are mixed in a solution, uniformly mixed ferrite particles can be easily produced. Then, the ferrite sol mixed with the ferrite particles can be concentrated as it is to form a paste, and the manufacturing process of the ferrite paste can be simplified.

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 1〜30μmの平均粒径のフェライト粒
子(A)と5〜50nmの平均粒径のフェライト粒子
(B)の混合粒子を含有し、その重量比がA:B=9
5:5〜20:80の範囲であることを特徴とするフェ
ライトペースト。
1. A mixed particle of ferrite particles (A) having an average particle diameter of 1 to 30 μm and ferrite particles (B) having an average particle diameter of 5 to 50 nm, the weight ratio of which is A: B = 9.
A ferrite paste having a range of 5: 5 to 20:80.
【請求項2】 請求項1記載のフェライトペーストを製
造するに際し、構成金属の硝酸塩を溶解させた0.1〜
4.0Mのアルコール溶液を加熱還流して調製したフェ
ライトゾルに、構成金属の酸化物もしくは炭酸塩を混合
して、仮焼・粉砕を繰り返して調製したフェライト粉末
を加えて混合し、前記フェライト粉末とフェライトゾル
の混合物をフェライト含有量40〜90wt%の範囲に濃
縮してペースト化することを特徴とするフェライトペー
ストの製造方法。
2. The method for producing the ferrite paste according to claim 1, wherein the nitrate of the constituent metal is dissolved in 0.1 to 0.1%.
A ferrite sol prepared by heating and refluxing a 4.0 M alcohol solution is mixed with an oxide or carbonate of a constituent metal, and a ferrite powder prepared by repeating calcination and pulverization is added and mixed. A method for producing a ferrite paste, which comprises concentrating a mixture of a ferrite sol and a ferrite sol in a range of a ferrite content of 40 to 90 wt% to form a paste.
JP4736492A 1992-03-04 1992-03-04 Ferrite paste and manufacture thereof Withdrawn JPH05308016A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4736492A JPH05308016A (en) 1992-03-04 1992-03-04 Ferrite paste and manufacture thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4736492A JPH05308016A (en) 1992-03-04 1992-03-04 Ferrite paste and manufacture thereof

Publications (1)

Publication Number Publication Date
JPH05308016A true JPH05308016A (en) 1993-11-19

Family

ID=12773059

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4736492A Withdrawn JPH05308016A (en) 1992-03-04 1992-03-04 Ferrite paste and manufacture thereof

Country Status (1)

Country Link
JP (1) JPH05308016A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007141843A1 (en) * 2006-06-06 2007-12-13 Nitto Denko Corporation Spherical sintered ferrite particle, semiconductor sealing resin composition making use of the same and semiconductor device obtained therewith
JP2009295985A (en) * 2008-06-05 2009-12-17 Tridelta Weichferrite Gmbh Soft-magnetic material, and process for producing article composed of the soft-magnetic material

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007141843A1 (en) * 2006-06-06 2007-12-13 Nitto Denko Corporation Spherical sintered ferrite particle, semiconductor sealing resin composition making use of the same and semiconductor device obtained therewith
JP2009295985A (en) * 2008-06-05 2009-12-17 Tridelta Weichferrite Gmbh Soft-magnetic material, and process for producing article composed of the soft-magnetic material

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