JP2898343B2 - Oxide magnetic material and method for producing the same - Google Patents
Oxide magnetic material and method for producing the sameInfo
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- JP2898343B2 JP2898343B2 JP2096834A JP9683490A JP2898343B2 JP 2898343 B2 JP2898343 B2 JP 2898343B2 JP 2096834 A JP2096834 A JP 2096834A JP 9683490 A JP9683490 A JP 9683490A JP 2898343 B2 JP2898343 B2 JP 2898343B2
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Description
【発明の詳細な説明】 イ．発明の目的 〔産業上の利用分野〕 本発明は、電波暗室の内壁に張り付けるフェライト電
波吸収体であって、30MHZ〜1000MHZの周波数帯域で用い
るNi−Cu−Zn系の酸化物磁性材料及びその製造方法に関
するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ferrite electromagnetic wave absorber attached to the inner wall of an anechoic chamber, a Ni-Cu-Zn-based oxide magnetic material used in a frequency band of 30 MHZ to 1000 MHZ, and the same. It relates to a manufacturing method.
従来この種のフェライト電波吸収体及びその製造方法
は、主成分が酸化亜鉛（以下ZnOと記す）、一酸化ニッ
ケル（以下NiOと記す）、一酸化銅（以下CuOと記す）、
及び酸化第２鉄（以下Fe2O3と記す）の粉末をプレス成
形機を用いてプレス成形体とし、これを大気中で焼結し
てNi−Cu−Zn系の酸化物磁性材料（以下Ni−Cu−Zn系フ
ェライトと称す）の焼結体を作り、これを電波暗室の内
壁に張り付けて用いているが、同じ厚さで比較し電波の
反射が最も小さい値となる整合厚にした時、従来の組成
によるNi−Cu−Zn系フェライトでは実用上必要な特性で
ある電磁反射係数が−20dB以下の特性を得るための周波
数帯域は、35MHZ〜350MHZと狭く、実際に電波暗室に用
いる時は、電磁反射係数の値が小さい周波数範囲では、
Ni−Cu−Zn系フェライト材とウレタン吸収体とを整合さ
せて用いている。電磁反射係数の値が狭い従来のNi−Cu
−Zn系フェライトではウレタン吸収体の使用量も多く、
又低い周波数帯域に於てはウレタン吸収体が長くなって
しまう欠点があった。Conventionally, this type of ferrite electromagnetic wave absorber and its manufacturing method are mainly composed of zinc oxide (hereinafter referred to as ZnO), nickel monoxide (hereinafter referred to as NiO), copper monoxide (hereinafter referred to as CuO),
And a powder of ferric oxide (hereinafter referred to as Fe 2 O 3 ) is formed into a press-formed body using a press-forming machine, which is sintered in the air to obtain a Ni—Cu—Zn-based oxide magnetic material (hereinafter, referred to as “Ni—Cu—Zn”). Ni-Cu-Zn ferrite) is used to make a sintered body, which is attached to the inner wall of an anechoic chamber. In the case of Ni-Cu-Zn ferrite with the conventional composition, the frequency band for obtaining the characteristic of -20 dB or less as the electromagnetic reflection coefficient which is a practically necessary characteristic is as narrow as 35 MHZ to 350 MHZ, and is actually used in an anechoic chamber. At the time, in the frequency range where the value of the electromagnetic reflection coefficient is small,
The Ni—Cu—Zn ferrite material and the urethane absorber are used in alignment. Conventional Ni-Cu with narrow electromagnetic reflection coefficient
-The amount of urethane absorber used in Zn-based ferrite is large,
Further, there is a disadvantage that the urethane absorber becomes long in a low frequency band.
本発明は、かかるマイクロ波帯域において、広い周波
数帯域で電磁波の反射係数が−20dB以下である、電波吸
収特性の良いしかも高密度な電波暗室の内壁に用いる電
波吸収体であるNi−Cu−Zn系酸化磁性材料及びその製造
方法を提供することを目的とする。The present invention, in such a microwave band, the reflection coefficient of electromagnetic waves in a wide frequency band is -20dB or less, Ni-Cu-Zn is a radio wave absorber used for the inner wall of a radio wave anechoic chamber with good radio wave absorption characteristics and high density It is an object to provide a system based oxidized magnetic material and a method for producing the same.
ロ．発明の構成 〔課題を解決するための手段〕 前記課題を解決するために、本発明の酸化物磁性材料
においては、酸化亜鉛が32〜35.0モル％、一酸化ニッケ
ルが10〜12モル％、一酸化銅が５〜７モル％、及び残が
酸化第２鉄を主成分とするNi−Cu−Zn系フェライトであ
る酸化物磁性材料に、0.03重量％以下の二酸化ケイ素
（以下SiO2と記す）、0.10重量％以下の一酸化マンガン
（以下MnOと記す）の１種又は２種を含有し、更に0.05
重量％以下の三酸化ビスマス（以下Bi2O3と記す）を含
有又は添加したものに、0.06重量％以下（０重量％を含
まず）の範囲で酸化アルミニウム（以下Al2O3と記す）
を添加し、大気中雰囲気で1100℃ないし1170℃の温度範
囲で２時間保持し焼結を行うことにより、電磁波の反射
係数が−20dB以下である周波数帯域が、35MHZ〜545MHZ
と従来の組成比に比べて電磁反射係数の値の低いNi−Cu
−Zn系酸化物磁性材料及びその製造方法を提供するもの
である。B. Constitution of the Invention [Means for Solving the Problems] In order to solve the above problems, in the oxide magnetic material of the present invention, zinc oxide is 32 to 35.0 mol%, nickel monoxide is 10 to 12 mol%, and In an oxide magnetic material containing 5 to 7 mol% of copper oxide and the balance being Ni-Cu-Zn ferrite containing ferric oxide as a main component, 0.03% by weight or less of silicon dioxide (hereinafter referred to as SiO 2 ) , One or two of manganese monoxide (hereinafter referred to as MnO) of 0.10% by weight or less.
Aluminum oxide (hereinafter abbreviated as Al 2 O 3 ) in a range of 0.06% by weight or less (not including 0% by weight) to those containing or adding bismuth trioxide (hereinafter abbreviated as Bi 2 O 3 ) by weight.
And sintering at a temperature range of 1100 ° C. to 1170 ° C. for 2 hours in the air atmosphere, the frequency band where the reflection coefficient of electromagnetic waves is −20 dB or less is 35 MHz to 545 MHz.
And Ni-Cu with low electromagnetic reflection coefficient compared to the conventional composition ratio
The present invention provides a Zn-based oxide magnetic material and a method for producing the same.
即ち本発明は、 1. 32.0〜35.0モル％の酸化亜鉛（ZnO）、10.0〜12.0
モル％の一酸化ニッケル（NiO）、5.0〜7.0モル％の一
酸化銅（CuO）、及び残部が酸化第２鉄（Fe2O3）からな
る主成分と、副成分として0.03重量％以下（0.0重量％
を含まず）の二酸化ケイ素（SiO2）と0.10重量％以下
（0.0重量％を含まず）の一酸化マンガン（MnO）の夫々
１種又は２種の成分と、0.05重量％以下（0.0重量％を
含まず）の三酸化ビスマス（Bi2O3）及び0.06重量％以
下（0.0重量％を含まず）の酸化アルミニウム（Al2O3）
とからなることを特徴とするNi−Cu−Zn系の酸化物磁性
材料。That is, the present invention relates to: 1.32.0 to 35.0 mol% of zinc oxide (ZnO), 10.0 to 12.0 mol%
Mol% of nickel monoxide (NiO), 5.0-7.0 mole% of copper monoxide (CuO), and the main component the balance of ferric oxide (Fe 2 O 3), 0.03 wt% or less as an auxiliary component ( 0.0% by weight
) And one or two components of silicon dioxide (SiO 2 ) and manganese monoxide (MnO) of 0.10 wt% or less (not including 0.0 wt%), respectively, and 0.05 wt% or less (0.0 wt% ) Bismuth trioxide (Bi 2 O 3 ) and aluminum oxide (Al 2 O 3 ) of 0.06% by weight or less (excluding 0.0% by weight)
A Ni-Cu-Zn-based oxide magnetic material comprising:
2. 32.0〜35.0モル％の酸化亜鉛（ZnO）、10.0〜12.0
モル％の一酸化ニッケル（NiO）、5.0〜7.0モル％の一
酸化銅（CuO）、及び残部が酸化第２鉄（Fe2O3）からな
る主成分と、副成分として0.03重量％以下（0.0重量％
を含まず）の二酸化ケイ素（SiO2）と0.10重量％以下
（0.0重量％を含まず）の一酸化マンガン（MnO）の夫々
１種又は２種の成分と、0.05重量％以下（0.0重量％を
含まず）の三酸化ビスマス（Bi2O3）及び0.06重量％以
下（0.0重量％を含まず）の酸化アルミニウム（Al2O3）
とからなるNi−Cu−Zn系の酸化物のプレス成形体を、大
気中に於て1100℃ないし1170℃の温度範囲で焼結したこ
とを特徴とする酸化物磁性材料の製造方法である。2. 32.0-35.0 mol% of zinc oxide (ZnO), 10.0-12.0
Mol% of nickel monoxide (NiO), 5.0-7.0 mole% of copper monoxide (CuO), and the main component the balance of ferric oxide (Fe 2 O 3), 0.03 wt% or less as an auxiliary component ( 0.0% by weight
) And one or two components of silicon dioxide (SiO 2 ) and manganese monoxide (MnO) of 0.10 wt% or less (not including 0.0 wt%), respectively, and 0.05 wt% or less (0.0 wt% ) Bismuth trioxide (Bi 2 O 3 ) and aluminum oxide (Al 2 O 3 ) of 0.06% by weight or less (excluding 0.0% by weight)
A sintered compact of a Ni-Cu-Zn-based oxide formed of the following in a temperature range of 1100 ° C to 1170 ° C in the air.
本発明によるNi−Cu−Zn系酸化物磁性材料に於て、主
成分である32.0〜35.0モル％の酸化亜鉛（ZnO）、10.0
〜12.0モル％の一酸化ニッケル（NiO）、5.0〜7.0モル
％の一酸化銅（CuO）及び残部が49.0〜50.0モル％の酸
化第２鉄（Fe2O3）に於いては、酸化亜鉛（ZnO）、一酸
化銅（CuO）の組成比の増加、及び一酸化ニッケル（Ni
O）、酸化第２鉄（Fe2O3）の組成比の低下と共に、磁気
特性の初比透磁率は向上するが、キュリー温度が低下
し、実用上磁性を失うキュリー温度の値が少なくとも10
0℃以上である必要から、酸化亜鉛（ZnO）の値が12モル
％以下、一酸化銅（CuO）の値が7.0モル％以下、一酸化
ニッケル（NiO）の値は5.0モル％以上の組成比とする必
要があり、一方高い初比透磁率を得るため、本発明のZn
O、NiO、CuOの組成比の範囲に於ては、酸化第２鉄（Fe2
O3）の値は49.0〜50モル％、又初比透磁率の値が1600以
下となる良好な電磁反射係数を示す特性値は、第３表に
示す通り低周波領域から高周波領域へ移るため、酸化亜
鉛（ZnO）の組成比は10.0モル％以上、一酸化ニッケル
（NiO）では12.0モル％以下、一酸化銅（CuO）では5.0
モル％以上の範囲の組成比とすることが必要である。In the Ni—Cu—Zn oxide magnetic material according to the present invention, 32.0 to 35.0 mol% of zinc oxide (ZnO),
12.0 mol% of nickel monoxide (NiO), is at the 5.0-7.0 mole% of copper monoxide (CuO) and the balance 49.0 to 50.0 mol% of ferric oxide (Fe 2 O 3), zinc oxide (ZnO), increase in the composition ratio of copper monoxide (CuO), and nickel monoxide (Ni
O) and the composition ratio of ferric oxide (Fe 2 O 3 ) decrease, the initial relative permeability of the magnetic properties increases, but the Curie temperature decreases and the Curie temperature at which the magnetism is practically lost is at least 10%.
Since the temperature must be 0 ° C or higher, the composition of zinc oxide (ZnO) is 12 mol% or less, copper monoxide (CuO) is 7.0 mol% or less, and nickel monoxide (NiO) is 5.0 mol% or more. Ratio, on the other hand, in order to obtain a high initial relative permeability, the Zn of the present invention
Within the range of the composition ratio of O, NiO, and CuO, ferric oxide (Fe 2
The value of O 3 ) is 49.0 to 50 mol%, and the characteristic value indicating a good electromagnetic reflection coefficient at which the value of the initial relative magnetic permeability is 1600 or less shifts from the low frequency region to the high frequency region as shown in Table 3. The composition ratio of zinc oxide (ZnO) is 10.0 mol% or more, nickel monoxide (NiO) is 12.0 mol% or less, and copper monoxide (CuO) is 5.0 mol%.
It is necessary to set the composition ratio in the range of mol% or more.
又以上の組成比を持つNi−Cu−Zn系フェライトに、三
酸化ビスマス（Bi2O3）を0.05重量％以下（０を含ま
ず）と酸化アルミニウム（Al2O3）を0.06重量％以下
（０を含まず）とを混合添加し、1100〜1170℃の大気中
で２時間焼結することにより、初比透磁率が高く、高い
周波数帯域に於ける電磁反射係数を向上するために必要
な誘電率が小さく、−20dBの電磁反射係数の周波数範囲
の広い酸化物磁性材料、及びその製造方法とすることが
出来る。In addition, bismuth trioxide (Bi 2 O 3 ) is 0.05% by weight or less (excluding 0) and aluminum oxide (Al 2 O 3 ) is 0.06% by weight or less in Ni-Cu-Zn ferrite having the above composition ratio. (Not including 0) and sintering in air at 1100-1170 ° C for 2 hours, high initial relative permeability, necessary for improving electromagnetic reflection coefficient in high frequency band An oxide magnetic material having a low dielectric constant and a wide frequency range with an electromagnetic reflection coefficient of −20 dB, and a method for manufacturing the same can be provided.
以下、本発明の実施例について説明する。 Hereinafter, examples of the present invention will be described.
実施例１ 主成分として、50.0モル％の酸化第２鉄（Fe2O3）、3
2.0モル％の酸化亜鉛（ZnO）、12.0モル％の酸化ニッケ
ル（NiO）、及び5.0モル％の一酸化銅（CuO）を含有
し、副成分として0.01重量％の二酸化ケイ素（SiO2）と
0.05重量％の一酸化マンガンを含有するNi−Cu−Zn系フ
ェライトに、酸化ビスマス（Bi2O3）を0.0〜0.07重量
％、酸化アルミニウム（Al2O3）を0.0〜0.06重量％を第
１表の試料No1〜13に示すようにそれぞれ単独あるいは
複合添加し、混合、予備予焼、造粒し、プレス機により
酸化物磁性材料粉末をプレス成形した後、1000℃ないし
1170℃の間の温度で２時間、大気中雰囲気で焼結した。Example 1 As a main component, 50.0 mol% of ferric oxide (Fe 2 O 3 ), 3
It contains 2.0 mol% of zinc oxide (ZnO), 12.0 mol% of nickel oxide (NiO), and 5.0 mol% of copper monoxide (CuO), and 0.01% by weight of silicon dioxide (SiO 2 ) as a sub-component.
The Ni-Cu-Zn ferrite containing 0.05 wt% of manganese monoxide, 0.0 to 0.07 wt% of bismuth oxide (Bi 2 O 3), a 0.0 to 0.06 wt% of aluminum oxide (Al 2 O 3) a As shown in Sample Nos. 1 to 13 in Table 1, each was added alone or in combination, mixed, pre-fired, granulated, and pressed with an oxide magnetic material powder using a press machine.
Sintering was performed at a temperature between 1170 ° C. for 2 hours in an atmosphere in the air.
その場合の各組成の試料Noと1MHZでの初比透磁率μ
ｏ、電磁反射係数が−20dB以下となる周波数帯域と、1M
HZに於ける誘電率を第１表に示す。Sample No. of each composition in that case and initial relative permeability μ at 1 MHz
o, the frequency band where the electromagnetic reflection coefficient is -20dB or less, and 1M
Table 1 shows the dielectric constant of HZ.
第１表に示すように、三酸化ビスマスの単独添加の場
合には、0.03〜0.07重量％の組成比の範囲で初比透磁率
μｏが顕著に向上し、初比透磁率μｏの値は2000以上と
なるが、誘電率の値が大きくなるため電磁反射係数の値
が−20dB以下となる周波数帯域が狭くなっている。一
方、酸化アルミニウム（Al2O3）の単独添加では、0.005
〜0.06重量％の組成範囲で誘電率の値が低下することに
より電磁反射係数が−20dB以下となる周波数帯域が広く
なり、特性の改善が認められるが、初比透磁率の値が大
幅に低下し、しかも電磁反射係数の値が−20dB以下とな
る低周波側の周波数は高い周波数に移動する。三酸化ビ
スマス（Bi2O3）と酸化アルミニウム（Al2O3）とを同時
に添加した時には、三酸化ビスマス（Bi2O3）の単独添
加の時の初透磁率を維持したまま低い誘電率の値が得ら
れ、電磁反射係数が−20dB以下の特性となる周波数帯域
を広げ、従来の組成比の酸化物磁性材料に比べて特性の
改善が認められる。As shown in Table 1, in the case of adding bismuth trioxide alone, the initial relative permeability μo was significantly improved in the composition ratio range of 0.03 to 0.07% by weight, and the value of the initial relative permeability μo was 2000. As described above, since the value of the dielectric constant is increased, the frequency band in which the value of the electromagnetic reflection coefficient is −20 dB or less is narrowed. On the other hand, the addition of aluminum oxide (Al 2 O 3 ) alone
When the value of the dielectric constant decreases in the composition range of ~ 0.06% by weight, the frequency band where the electromagnetic reflection coefficient becomes -20dB or less is widened and the characteristics are improved, but the value of the initial relative magnetic permeability is greatly reduced. In addition, the frequency on the low frequency side where the value of the electromagnetic reflection coefficient becomes −20 dB or less moves to a higher frequency. When bismuth trioxide (Bi 2 O 3 ) and aluminum oxide (Al 2 O 3 ) are added simultaneously, a low dielectric constant is maintained while maintaining the initial magnetic permeability when bismuth trioxide (Bi 2 O 3 ) is added alone. Is obtained, the frequency band in which the electromagnetic reflection coefficient has a characteristic of −20 dB or less is widened, and the characteristic is improved as compared with a conventional oxide magnetic material having a composition ratio.
すなわち、三酸化ビスマス（Bi2O3）が0.03〜0.05重
量％、酸化アルミニウム（Al2O3）が0.005〜0.06重量％
の組成範囲で、初比透磁率μｏは2000以上、かつ電磁反
射係数が−20dB以下の特性となる周波数帯域はほぼ40MH
z〜525MHZとなり、電磁反射係数を大幅に改善すること
が出来た。尚、この場合、焼結温度は大気中で1100℃〜
1170℃の範囲で保持温度は２時間である。焼結温度が11
00℃より低い温度では初比透磁率の低下を招き、又1170
℃を越える温度では誘電率の値が高くなり、高い周波数
域に於ける電波吸収特性が劣化し、初比透磁率も低下す
るため低周波域での電波吸収特性も劣化する。That is, bismuth trioxide (Bi 2 O 3 ) is 0.03 to 0.05% by weight, and aluminum oxide (Al 2 O 3 ) is 0.005 to 0.06% by weight.
In the composition range, the initial relative magnetic permeability μo is 2,000 or more, and the frequency band in which the electromagnetic reflection coefficient is −20 dB or less is almost 40 MHz.
It became z ~ 525MHZ, and the electromagnetic reflection coefficient was able to be greatly improved. In this case, the sintering temperature is 1100 ° C.
The holding temperature is 2 hours in the range of 1170 ° C. Sintering temperature 11
At a temperature lower than 00 ° C, the initial relative magnetic permeability decreases, and
At a temperature exceeding ℃, the value of the dielectric constant increases, the radio wave absorption characteristics in a high frequency range deteriorate, and the initial relative magnetic permeability also decreases, so that the radio wave absorption characteristics in a low frequency range also deteriorate.
実施例２ 主成分として50.0モル％の酸化第２鉄（Fe2O3）、30.
0モル％の酸化亜鉛（ZnO）、10.0モル％の酸化ニッケル
（NiO）、及び7.0モル％の酸化銅（CuO）を含有し、副
成分として0.01重量％の二酸化ケイ素（SiO2）と0.05重
量％の一酸化マンガン（MNO）を含有するNi−Cu−Zn系
フェライトに、三酸化ビスマス（Bi2O3）0.0〜0.07重量
％、酸化アルミニウム（Al2O3）0.0〜0.06重量％をそれ
ぞれ単独あるいは複合添加し、混合、予備予焼、造粒
し、成形プレスを行った後、1100℃〜1170℃で２時間大
気中雰囲気で焼結した。Example 2 50.0 mol% of ferric oxide (Fe 2 O 3 ) as a main component, 30.
Contains 0 mol% of zinc oxide (ZnO), 10.0 mol% of nickel oxide (NiO), and 7.0 mol% of copper oxide (CuO), and 0.01 wt% of silicon dioxide (SiO 2 ) and 0.05 wt% as subcomponents % Of manganese monoxide (MNO) and 0.0-0.07% by weight of bismuth trioxide (Bi 2 O 3 ) and 0.0-0.06% by weight of aluminum oxide (Al 2 O 3 ) After single or combined addition, mixing, preliminary pre-firing, granulation, and press forming, sintering was performed at 1100 ° C. to 1170 ° C. for 2 hours in the atmosphere.
その場合の各組成に対する1MHZでの初比透磁率μｏ、
電磁反射係数が−20dB以下となる周波数帯域と誘電率の
値を第２表に示す。Initial relative permeability μo at 1MHZ for each composition in that case,
Table 2 shows the frequency band in which the electromagnetic reflection coefficient is -20 dB or less and the value of the dielectric constant.
第２表の結果に示すとおり、三酸化ビスマス（Bi
2O3）の単独添加では0.03〜0.07重量％の範囲で初比透
磁率が向上し、初比透磁率μｏの値は2000以上となる
が、誘電率の値が大きいために電磁反射係数が−20dB以
下での周波数帯域が大幅に減少する。一方酸化アルミニ
ウム（Al2O3）の単独添加では0.02〜0.06重量％の範囲
で、誘電率及び電磁反射特性の改善は認められるが、初
比透磁率が大幅に低下している。As shown in the results in Table 2, bismuth trioxide (Bi
When 2 O 3 ) is added alone, the initial relative permeability increases in the range of 0.03 to 0.07% by weight, and the value of the initial relative permeability μo becomes 2000 or more. The frequency band below -20dB is greatly reduced. On the other hand, when aluminum oxide (Al 2 O 3 ) is added alone, the dielectric constant and the electromagnetic reflection characteristics are improved in the range of 0.02 to 0.06% by weight, but the initial relative magnetic permeability is significantly reduced.
三酸化ビスマス（Bi2O3）及び酸化アルミニウム（Al2
O3）を同時に添加すると、三酸化ビスマス（Bi2O3）の
単独添加の時の初比透磁率を維持したまま低い誘電率が
得られ、電磁反射特性の周波数帯域の改善が認められ
る。さらに、三酸化ビスマス（Bi2O3）0.03〜0.07重量
％、酸化アルミニウム（Al2O3）0.02〜0.06重量％の範
囲では、1MHZの周波数で初比透磁率μｏは1800以上、誘
電率の値も低くなり、電磁反射係数が−20dB以下となる
周波数帯域は40MHZ〜525MHZと広がる。Bismuth trioxide (Bi 2 O 3 ) and aluminum oxide (Al 2
When O 3 ) is added at the same time, a low dielectric constant can be obtained while maintaining the initial relative magnetic permeability when bismuth trioxide (Bi 2 O 3 ) is added alone, and an improvement in the frequency band of the electromagnetic reflection characteristics is observed. Furthermore, in the range of bismuth trioxide (Bi 2 O 3 ) 0.03 to 0.07 wt% and aluminum oxide (Al 2 O 3 ) 0.02 to 0.06 wt%, the initial relative permeability μo is 1800 or more at a frequency of 1 MHZ, The value becomes lower, and the frequency band in which the electromagnetic reflection coefficient becomes −20 dB or less extends from 40 MHz to 525 MHz.
尚本発明のNi−Cu−Zn系フェライトの焼結温度は、大
気中1100℃〜1170℃で２時間行い、焼結温度が1100℃よ
り低い温度では初比透磁率の低下を招き、1170℃を超え
る温度では誘電率、吸収特性が劣化し、総合的に電磁反
射係数が−20dB以下の特性を示す範囲を狭める。Incidentally, the sintering temperature of the Ni-Cu-Zn ferrite of the present invention is performed in the atmosphere at 1100 ° C to 1170 ° C for 2 hours, and when the sintering temperature is lower than 1100 ° C, the initial relative magnetic permeability decreases, and 1170 ° C If the temperature exceeds, the dielectric constant and the absorption characteristics are degraded, and the range in which the electromagnetic reflection coefficient exhibits characteristics of -20 dB or less is narrowed.
実施例３ 主成分である酸化第２鉄（Fe2O3）を49.0〜50.0モル
％、酸化亜鉛（ZnO）を32.0〜37.0モル％、酸化ニッケ
ル（NiO）を8.0〜13.0モル％、一酸化銅（CuO）を5.0〜
8.0モル％を含有し、0.01重量％の二酸化ケイ素（SiO）
と0.05重量％の酸化マンガンMnO）を含有する第３表に
示す試料No28〜37の組成比のNi−Cu−Zn系フェライト
を、混合、予備予焼、造粒し、プレス成形した後、1140
℃で２時間、大気中雰囲気で焼結した。Example 3 Ferric oxide (Fe 2 O 3 ) as a main component was 49.0 to 50.0 mol%, zinc oxide (ZnO) was 32.0 to 37.0 mol%, nickel oxide (NiO) was 8.0 to 13.0 mol%, and monoxide was used. Copper (CuO) 5.0 ~
0.01 mol% silicon dioxide (SiO) containing 8.0 mol%
And Ni-Cu-Zn ferrite having a composition ratio of Samples Nos. 28 to 37 shown in Table 3 containing 0.05% by weight of manganese oxide (MnO) were mixed, pre-prefired, granulated, and press-formed.
Sintering was performed in an air atmosphere at a temperature of 2 ° C. for 2 hours.
夫々の試料につき1MHZでの初比透磁率μｏ、電磁反射
係数が−20dB以下となる周波数帯域と誘電率の値とを測
定し、結果を第３表に示す。For each sample, the initial relative magnetic permeability μo at 1 MHZ, the frequency band in which the electromagnetic reflection coefficient is -20 dB or less, and the value of the dielectric constant were measured, and the results are shown in Table 3.
第３表に示す結果より、酸化ニッケル（NiO）と酸化
亜鉛（ZnO）の比率を変化させると、酸化ニッケル（Ni
O）が少なくなるにつれて初比透磁率μｏは向上し、電
磁反射係数の低周波帯域での減衰効果が改善できるが、
高周波帯域での減衰効果が劣化している。From the results shown in Table 3, when the ratio of nickel oxide (NiO) and zinc oxide (ZnO) was changed, nickel oxide (NiO)
As O) decreases, the initial relative permeability μo increases, and the attenuation effect of the electromagnetic reflection coefficient in the low frequency band can be improved.
The attenuation effect in the high frequency band has deteriorated.
酸化ニッケル（NiO）と、酸化銅（CuO）との比率を変
化させると、酸化ニッケル（NiO）が少なくなるにつれ
て初比透磁率μｏは向上し、電磁反射係数の低周波帯域
での電磁反射係数が改善される。また、従来と同じ電磁
反射係数を必要とする時には、試料の整合厚みを薄くす
ることが可能となる。When the ratio between nickel oxide (NiO) and copper oxide (CuO) is changed, the initial relative permeability μo increases as the nickel oxide (NiO) decreases, and the electromagnetic reflection coefficient in the low frequency band of the electromagnetic reflection coefficient Is improved. When the same electromagnetic reflection coefficient is required as in the conventional case, the matching thickness of the sample can be reduced.
即ち、酸化第２鉄（Fe2O3）49.0〜50.0モル％、酸化
亜鉛（ZnO）32.0〜35.0モル％、酸化ニッケル（NiO）1
0.0〜12.0モル％、一酸化銅（CuO）5.0〜7.0モル％の組
成の範囲においては、初比透磁率μｏは大幅に低下する
ことなく、低周波帯域における電磁反射係数を改善する
ことができる。尚この場合、焼結温度は大気中で1100〜
1170℃保持２時間の範囲である。That is, 49.0 to 50.0 mol% of ferric oxide (Fe 2 O 3 ), 32.0 to 35.0 mol% of zinc oxide (ZnO), and nickel oxide (NiO) 1
In the composition range of 0.0 to 12.0 mol% and copper monoxide (CuO) of 5.0 to 7.0 mol%, the initial relative permeability μo can be improved without significantly lowering the electromagnetic reflection coefficient in a low frequency band. . In this case, the sintering temperature is 1100-
It is in the range of 1170 ° C. for 2 hours.
ハ．発明の効果 以上の説明の通り本発明による酸化物磁性材料は、0.
05重量％以下（0.0重量％を含まず）の三酸化ビスマス
（Bi2O3）と、0.05重量％以下（0.0重量％を含まず）の
酸化アルミニウム（Al2O3）を32.5〜35モル％の酸化亜
鉛（ZnO）、10〜12モル％の二酸化ニッケル（NiO）、5.
0〜7.0モル％の一酸化銅（CuO）、及び残部が酸化第２
鉄（Fe2O3）からなる主成分と、副成分として0.03重量
％以下の二酸化硅素（SiO2）、0.10重量％以下の一酸化
マンガン（MnO）の夫々１種又は２種のフェライトに同
時に添加し、更に0.02〜0.05重量％の酸化ビスマス（Bi
2O3）と0.02〜0.06重量％の酸化アルミニウム（Al2O3）
を同時に添加し、1100〜1170℃の温度範囲で大気中雰囲
気中で焼結することにより、従来のNi−Cu−Zn系フェラ
イトに比べて初比透磁率を向上し、且つ誘電率の値を低
下することにより、電磁反射係数の値が−20dB以下とな
る周波数帯域を低周波側と高周波側共に拡大した新規な
電波吸収特性に優れた酸化物磁性材料及びその製造方法
の提供が可能となった。 C. Effect of the Invention As described above, the oxide magnetic material according to the present invention has a capacity of 0.
32.5 to 35 mol of bismuth trioxide (Bi 2 O 3 ) of 0.05% by weight or less (excluding 0.0% by weight) and aluminum oxide (Al 2 O 3 ) of 0.05% by weight or less (excluding 0.0% by weight) % Zinc oxide (ZnO), 10-12 mol% nickel dioxide (NiO), 5.
0-7.0 mol% of copper monoxide (CuO), and the remainder is secondary oxide
Simultaneously with one or two types of ferrites of iron (Fe 2 O 3 ) as main component and 0.03 wt% or less of silicon dioxide (SiO 2 ) and 0.10 wt% or less of manganese monoxide (MnO) as subcomponents And further add 0.02-0.05% by weight of bismuth oxide (Bi
2 O 3 ) and 0.02-0.06% by weight of aluminum oxide (Al 2 O 3 )
At the same time, and sintering in the air atmosphere at a temperature range of 1100 to 1170 ° C. to improve the initial relative magnetic permeability as compared with the conventional Ni-Cu-Zn ferrite and to increase the dielectric constant. By lowering, it becomes possible to provide a novel oxide magnetic material having excellent electromagnetic wave absorption characteristics and a method for producing the same, in which the frequency band in which the value of the electromagnetic reflection coefficient is −20 dB or less is expanded on both the low frequency side and the high frequency side. Was.
Claims (2)
0〜12.0モル％の一酸化ニッケル（NiO）、5.0〜7.0モル
％の一酸化銅（CuO）、及び残部が酸化第２鉄（Fe2O3）
からなる主成分と、副成分として0.03重量％以下（0.0
重量％を含まず）の二酸化ケイ素（SiO2）と0.10重量％
以下（0.0重量％を含まず）の一酸化マンガン（MnO）の
夫々１種又は２種の成分と、0.05重量％以下（0.0重量
％を含まず）の三酸化ビスマス（Bi2O3）及び0.06重量
％以下（0.0重量％を含まず）の酸化アルミニウム（Al2
O3）とからなることを特徴とするNi−Cu−Zn系の酸化物
磁性材料。(1) 32.0-35.0 mol% of zinc oxide (ZnO);
0 to 12.0 mol% of nickel monoxide (NiO), 5.0-7.0 mole% of copper monoxide (CuO), and the balance of ferric oxide (Fe 2 O 3)
And 0.03% by weight or less (0.0% by weight)
Wt.% Silicon dioxide (SiO 2 ) and 0.10 wt.%
One or two components each of manganese monoxide (MnO) (not including 0.0% by weight), bismuth trioxide (Bi 2 O 3 ) of 0.05% by weight or less (not including 0.0% by weight) and 0.06% by weight or less (not including 0.0% by weight) of aluminum oxide (Al 2
O 3 ), comprising a Ni—Cu—Zn-based oxide magnetic material.
0〜12.0モル％の一酸化ニッケル（NiO）、5.0〜7.0モル
％の一酸化銅（CuO）、及び残部が酸化第２鉄（Fe2O3）
からなる主成分と、副成分として0.03重量％以下（0.0
重量％を含まず）の二酸化ケイ素（SiO2）と0.10重量％
以下（0.0重量％を含まず）の一酸化マンガン（MnO）の
夫々１種又は２種の成分と、0.05重量％以下（0.0重量
％を含まず）の三酸化ビスマス（Bi2O3）及び0.06重量
％以下（0.0重量％を含まず）の酸化アルミニウム（Al2
O3）とからなるNi−Cu−Zn系酸化物のプレス成形体を、
大気中に於て1100℃ないし1170℃の温度範囲で焼結した
ことを特徴とする酸化物磁性材料の製造方法。(2) 32.0-35.0 mol% of zinc oxide (ZnO);
0 to 12.0 mol% of nickel monoxide (NiO), 5.0-7.0 mole% of copper monoxide (CuO), and the balance of ferric oxide (Fe 2 O 3)
And 0.03% by weight or less (0.0% by weight)
Wt.% Silicon dioxide (SiO 2 ) and 0.10 wt.%
One or two components each of manganese monoxide (MnO) (not including 0.0% by weight), bismuth trioxide (Bi 2 O 3 ) of 0.05% by weight or less (not including 0.0% by weight) and 0.06% by weight or less (not including 0.0% by weight) of aluminum oxide (Al 2
O 3 ) and a press-formed body of a Ni-Cu-Zn-based oxide
A method for producing an oxide magnetic material, comprising sintering in the temperature range of 1100 ° C to 1170 ° C in the atmosphere.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2096834A JP2898343B2 (en) | 1990-04-11 | 1990-04-11 | Oxide magnetic material and method for producing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2096834A JP2898343B2 (en) | 1990-04-11 | 1990-04-11 | Oxide magnetic material and method for producing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03293705A JPH03293705A (en) | 1991-12-25 |
| JP2898343B2 true JP2898343B2 (en) | 1999-05-31 |
Family
ID=14175565
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2096834A Expired - Fee Related JP2898343B2 (en) | 1990-04-11 | 1990-04-11 | Oxide magnetic material and method for producing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2898343B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008047854A1 (en) | 2006-10-19 | 2008-04-24 | Hitachi Metals, Ltd. | Radio wave absorption material and radio wave absorber |
| CN104177075A (en) * | 2014-08-14 | 2014-12-03 | 蕲春县蕊源电子有限公司 | Heat-shock-resistant soft magnetic ferrite material and preparation method thereof |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3422709B2 (en) * | 1998-12-04 | 2003-06-30 | ティーディーケイ株式会社 | Radio wave absorber |
| CN109665832A (en) * | 2018-12-10 | 2019-04-23 | 安徽精磁电子有限公司 | A kind of low-power consumption, the magnetic core of high superimposed characteristics and preparation method thereof |
| CN114685940A (en) * | 2020-12-30 | 2022-07-01 | 洛阳尖端技术研究院 | Wave-absorbing adhesive film, wave-absorbing prepreg and preparation method of wave-absorbing adhesive film and wave-absorbing prepreg |
-
1990
- 1990-04-11 JP JP2096834A patent/JP2898343B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008047854A1 (en) | 2006-10-19 | 2008-04-24 | Hitachi Metals, Ltd. | Radio wave absorption material and radio wave absorber |
| CN104177075A (en) * | 2014-08-14 | 2014-12-03 | 蕲春县蕊源电子有限公司 | Heat-shock-resistant soft magnetic ferrite material and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03293705A (en) | 1991-12-25 |
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