JPH0625034B2 - Magnetic ceramics and manufacturing method thereof - Google Patents
Magnetic ceramics and manufacturing method thereofInfo
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- JPH0625034B2 JPH0625034B2 JP63093533A JP9353388A JPH0625034B2 JP H0625034 B2 JPH0625034 B2 JP H0625034B2 JP 63093533 A JP63093533 A JP 63093533A JP 9353388 A JP9353388 A JP 9353388A JP H0625034 B2 JPH0625034 B2 JP H0625034B2
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Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、磁性セラミツクス及びその製造法に係り、特
に焼結時の寸法変化率が小さく、電気抵抗率が絶縁体か
ら導電体まで可変であると共に耐酸化性、耐食性に優れ
た磁性セラミツクスに関する。Description: TECHNICAL FIELD The present invention relates to a magnetic ceramic and a method for manufacturing the same, and in particular, the dimensional change rate during sintering is small, and the electrical resistivity is variable from an insulator to a conductor. The present invention relates to a magnetic ceramic having excellent oxidation resistance and corrosion resistance.
一般に、磁性材料としては、Fe系、Ni系を代表に、Fe-C
r-Co磁石、フエライト磁石、希土類コバルト焼結磁石な
どよく知られている。しかし、これらの磁性材料は高価
であり、もろいために割れやすく、大型品が得られにく
い、耐酸化性、耐食性、耐熱性に弱いなどの欠点があ
る。特殊な環境下での使用には耐えられなかつた。Generally, as magnetic materials, Fe-C and Ni-based are representative.
Well-known are r-Co magnets, ferrite magnets, and rare earth cobalt sintered magnets. However, these magnetic materials are expensive and easily broken due to their brittleness, and it is difficult to obtain a large-sized product, and they have drawbacks such as poor oxidation resistance, corrosion resistance, and heat resistance. It was unbearable for use in a special environment.
この欠点を補う目的で、ボンド磁石というのがある。こ
の材料は、磁性粒子をプラスチツクや合成ゴムで結合す
るものである。これにより、硬くてもろいという欠点を
カバーしているが、その使用温度範囲が１２０℃以下で
耐熱性、耐食性、耐酸化性に劣る。There is a bonded magnet for the purpose of compensating for this drawback. This material binds magnetic particles with plastic or synthetic rubber. This covers the drawback of being hard and brittle, but is inferior in heat resistance, corrosion resistance, and oxidation resistance at a use temperature range of 120 ° C. or lower.
上記従来技術は、耐酸化性、耐熱性、耐食性の点につい
て配慮がされておらず、機械構造用材料や機能材料とし
て使用が限られていた。The above-mentioned prior art does not consider oxidation resistance, heat resistance, and corrosion resistance, and is limited in its use as a material for machine structures and functional materials.
本発明の目的は、焼結時寸法変化率が小さく、導電体か
ら絶縁体まで抵抗率の制御が可能な優れた磁性セラミツ
クスを提供することにある。An object of the present invention is to provide an excellent magnetic ceramic having a small dimensional change rate during sintering and capable of controlling resistivity from an electric conductor to an insulator.
本発明を概説すれば、本発明の第１の発明は磁性セラミ
ツクスに関する発明であつて、無機化合物粒子と磁性粒
子とが、Si3N4、TiN、TiO2、及びAl2O4よりなる群から
選択した少なくとも１種のセラミツクスで互いに結合さ
れた気孔率４０％以下、磁性粒子含有率９０体積％以下
の焼結体であり、その表面層がセラミツクスで被覆され
ているものであることを特徴とする。Briefly describing the present invention, the first invention of the present invention relates to magnetic ceramics, wherein the inorganic compound particles and the magnetic particles are a group consisting of Si 3 N 4 , TiN, TiO 2 , and Al 2 O 4. A sintered body having a porosity of 40% or less and a magnetic particle content of 90% by volume or less, which are bonded to each other by at least one ceramic selected from the above, and the surface layer of which is covered with the ceramics. And
そして、本発明の第２の発明は上記第１の発明の磁性セ
ラミツクスの製造法の発明であつて、Si、Ti、及びAlよ
りなる群より選択した少なくとも１種の金属粒子と、磁
性粒子とを含有する成形体を、該金属粒子がSiを含有す
る場合には窒化性ガス雰囲気中、Alを含有する場合には
酸化性ガス雰囲気中、またTiを含有する場合には窒化性
又は酸化性ガス雰囲気中で加熱し、次いで得られた焼結
体の表面層をセラミツクスで被覆することを特徴とす
る。本発明方法においては、必要に応じて、該成形体中
に無機化合物粒子をあらかじめ存在させる。A second invention of the present invention is the invention of the method for producing a magnetic ceramics of the first invention, which comprises at least one metal particle selected from the group consisting of Si, Ti, and Al, and a magnetic particle. A molded body containing, in the case where the metal particles contain Si in a nitriding gas atmosphere, in the case of containing Al in an oxidizing gas atmosphere, and in the case of containing Ti, nitriding or oxidizing. It is characterized by heating in a gas atmosphere and then coating the surface layer of the obtained sintered body with ceramics. In the method of the present invention, if necessary, inorganic compound particles are present in the molded body in advance.
本発明によれば、セラミツクスと磁性材料の混合焼結体
とすることにより耐熱性、耐酸化性、耐食性に優れ、か
つ磁性を有するセラミツクスを提供することができる。According to the present invention, by using a mixed sintered body of ceramics and a magnetic material, it is possible to provide a ceramic having excellent heat resistance, oxidation resistance, corrosion resistance, and magnetism.
本発明は、焼結中に成形体中の金属粒子から生成する窒
化物又は酸化物により磁性粒子相互間を結合すると共に
粒子間の空隙を減少させることによつて、焼結時の寸法
変化率を小さくし、金属粉末から生成する窒化物又は酸
化物の種類により電気抵抗率を絶縁体や導電体制御可能
にするものである。The present invention provides a nitride or an oxide formed from metal particles in a compact during sintering to bond the magnetic particles to each other and reduce voids between the particles to obtain a dimensional change rate during sintering. And the electric resistivity can be controlled by an insulator or a conductor depending on the type of nitride or oxide produced from the metal powder.
本発明において、金属粒子は、Si、Ti、及びAlの少なく
とも１種からなる。このような金属粒子はその種類によ
つて窒化物又は酸化物の抵抗率が異なり、このような抵
抗率の異なる金属窒化物又は酸化物を組合せることによ
り、導電から絶縁まで抵抗率の制御が可能となる。例え
ば、Tiの窒化物は電気抵抗率が約１０-5Ωcmオーダと小
さいので導電性材料が得られ、逆にSiの窒化物は約１０
-5Ωcmオーダと大きいので絶縁性材料が得られる。In the present invention, the metal particles are made of at least one of Si, Ti and Al. Such metal particles have different nitride or oxide resistivities depending on their types, and by combining such metal nitrides or oxides having different resistivities, it is possible to control the resistivity from conduction to insulation. It will be possible. For example, Ti nitride has an electric resistivity as small as about 10 −5 Ωcm, so that a conductive material can be obtained.
Since it is as large as -5 Ωcm, an insulating material can be obtained.
また、例えば、Tiの酸化物は電気抵抗率が約１０3Ωcm
と絶縁と導電の中間領域に近いものが得られる。Also, for example, the oxide of Ti has an electrical resistivity of about 10 3 Ωcm.
And, it is possible to obtain a material close to an intermediate area between insulation and conductivity.
更に、電気抵抗を大きくすることにより、交流磁場にお
ける渦電流による損失を小さくできる。Further, by increasing the electric resistance, the loss due to the eddy current in the alternating magnetic field can be reduced.
本発明において、無機化合物の例としては酸化物、窒化
物、炭化物、酸窒化物、ケイ化物及びホウ化物よりなる
群から選択した少なくとも１種からなるものがあり、耐
熱性、耐酸化性、耐食性を考慮すると酸化物、窒化物、
炭化物が好ましい。特に、炭化ケイ素、窒化ケイ素、窒
化チタン、窒化ジルコニウム、酸化アルミニウム、酸化
ジルコニウム、窒化クロム、炭化クロム、炭窒化クロ
ム、炭化チタン、炭化ジルコニウムが好ましい。この無
機化合物の種類、量を変えることにより、抵抗率を制御
できる。本発明において、磁性粒子の例としてはFe、C
o、Ni、Gd又はDyの単体あるいはFe、Co、Ni、Gd、Dy、M
n、Cr又はCuの化合物の１種以上があり、特に磁性粒子
はFe、Co、Ni、Gd、Dy、Cu2MnAl、Cu2MnIn、MnB、Fe
3C、Mn4N、MnBi、MnSb、MnAs、CrFe、CrO2、EuS、EuO、
CoPt、Fe3Al、MnFe2O4、FeFe2O4、SmFeO3、CoFe2O4、Ni
Fe2O4、MnBi、CuFe2O4、Li0.5Fe2.5O4、MgFe2O4、Y3Fe5
O12、Gd3Fe5O12、Fe3O4、Fe2O3、BaFe12O19、La0.5Ca
0.5MnO3の少なくとも１種からなり、このような磁性粒
子の配合比を変えることにより、磁束密度、透磁率など
の磁気特性を制御することが可能である。In the present invention, examples of the inorganic compound include at least one selected from the group consisting of oxides, nitrides, carbides, oxynitrides, silicides and borides, and heat resistance, oxidation resistance and corrosion resistance. Considering oxides, nitrides,
Carbides are preferred. In particular, silicon carbide, silicon nitride, titanium nitride, zirconium nitride, aluminum oxide, zirconium oxide, chromium nitride, chromium carbide, chromium carbonitride, titanium carbide and zirconium carbide are preferable. The resistivity can be controlled by changing the type and amount of this inorganic compound. In the present invention, examples of magnetic particles include Fe and C
o, Ni, Gd or Dy alone or Fe, Co, Ni, Gd, Dy, M
There is at least one compound of n, Cr or Cu, and especially magnetic particles are Fe, Co, Ni, Gd, Dy, Cu 2 MnAl, Cu 2 MnIn, MnB, Fe.
3 C, Mn 4 N, MnBi, MnSb, MnAs, CrFe, CrO 2 , EuS, EuO,
CoPt, Fe 3 Al, MnFe 2 O 4 , FeFe 2 O 4 , SmFeO 3 , CoFe 2 O 4 , Ni
Fe 2 O 4 , MnBi, CuFe 2 O 4 , Li 0.5 Fe 2.5 O 4 , MgFe 2 O 4 , Y 3 Fe 5
O 12 , Gd 3 Fe 5 O 12 , Fe 3 O 4 , Fe 2 O 3 , BaFe 12 O 19 , La 0.5 Ca
It is made of at least one of 0.5 MnO 3 , and it is possible to control magnetic properties such as magnetic flux density and magnetic permeability by changing the compounding ratio of such magnetic particles.
ここで、磁性粒子は、１０メツシユ以下の粒子を用いる
のが好ましい。なぜなら、１０メツシユ超ではセラミツ
クスとの混合が不均一になりやすいためである。また繊
維状、ウイスカ状のものを用いても効果としては変わら
ない。すなわち本発明において粒子とは、粉末、粒のみ
ならず、前記のものも含んだ広義の小形状を意味する。Here, it is preferable to use particles of 10 mesh or less as the magnetic particles. This is because if it exceeds 10 meshes, the mixture with the ceramics tends to be non-uniform. Further, the effect does not change even if a fibrous or whisker-like material is used. That is, in the present invention, the particles mean not only powders and particles but also small shapes in a broad sense including the above-mentioned particles.
本発明において、気孔率を４０％以下とするのが好まい
し。気孔率が４０％を越えると強度が小さくなり、磁気
的特性が劣るためである。またこの気孔は主として開気
孔からなる。なぜなら、金属粒子からなる成形体を窒化
性又は酸化性ガス雰囲気下で焼結し、金属粒子が窒化性
又は酸化性ガスと反応して窒化物又は酸化物に変化して
焼結体を得るためには、窒化性又は酸化性ガスが成形体
中を通過する通気孔が必要であるからである。In the present invention, it is preferable that the porosity is 40% or less. This is because when the porosity exceeds 40%, the strength becomes small and the magnetic properties are poor. The pores are mainly open pores. This is because a compact formed of metal particles is sintered in a nitriding or oxidizing gas atmosphere, and the metal particles react with the nitriding or oxidizing gas to change into a nitride or oxide to obtain a sintered body. Requires a vent hole through which the nitriding or oxidizing gas passes through the molded body.
なお、気孔は、金属粒子が窒化物又は酸化物となつてい
る体積が膨大することにより生成するので、これらの量
により気孔率を制御することができる。Since the porosity is generated due to the enormous volume of the metal particles forming the nitride or the oxide, the porosity can be controlled by the amount thereof.
なおまた、この場合の焼結により、金属粒子の種類によ
つては金属粒子同志及び金属粒子と磁性粒子が反応する
場合があるが特性上問題はない。例えば、TiAl、TiA
l3、TiSi、ZrAlなどが一部生成する場合がある。Further, depending on the type of the metal particles, the sintering in this case may cause the metal particles to react with each other or the metal particles and the magnetic particles, but there is no problem in terms of characteristics. For example, TiAl, TiA
Some l 3 , TiSi, ZrAl, etc. may be generated.
成形体は、窒素及び／又はアンモニアに必要に応じて水
素、アルゴン、ヘリウムなどを加えた窒化性ガス雰囲気
下で加熱するのが好ましい。加熱は、５００〜１５００
℃間の温度において、段階的に加熱して行うことが好ま
しい。また加熱は、磁場を有する中で行うことにより磁
場の方向性の優れたセラミツクスが得られる。もちろ
ん、焼結体を磁場中で再加熱して磁性材料を常磁性体に
したのち冷却することにより、磁場の方向性に優れたセ
ラミツクスが得られる。また、このような処理をしない
ことにより、磁場が無方向性のセラミツクスの製造も可
能である。The compact is preferably heated in a nitrogen gas atmosphere in which hydrogen, argon, helium, and the like are added to nitrogen and / or ammonia as needed. Heating is 500-1500
It is preferable to perform the heating stepwise at a temperature of between ℃. Further, heating is performed in the presence of a magnetic field, whereby a ceramic having excellent magnetic field directionality can be obtained. Of course, by reheating the sintered body in a magnetic field to transform the magnetic material into a paramagnetic material and then cooling it, a ceramic having excellent magnetic field directionality can be obtained. Further, by not performing such a treatment, it is possible to manufacture ceramics in which the magnetic field is nondirectional.
本発明によつて得られた磁性セラミツクスの中味の１例
の断面を第１図に模式的として示す。第１図において、
符号１は磁性粒子、２はセラミツクスを意味する。A cross section of an example of the contents of the magnetic ceramic obtained according to the present invention is shown schematically in FIG. In FIG.
Reference numeral 1 means magnetic particles, and 2 means ceramics.
また第１図のようにして得られた磁性セラミツクス焼結
体の表面層をSi3N4 などのセラミツクスで覆うと更に耐
酸化性、耐食性に優れた磁性セラミツクスが得られる。
このようにして得られた本発明の１例の磁性セラミツク
スの断面を第２図に模式的として示す。第２図におい
て、符号１及び２は第１図と同義であり、３はセラミツ
クスを意味する。Further, when the surface layer of the magnetic ceramics sintered body obtained as shown in FIG. 1 is covered with ceramics such as Si 3 N 4 , a magnetic ceramics further excellent in oxidation resistance and corrosion resistance can be obtained.
The cross section of the magnetic ceramics of one example of the present invention thus obtained is schematically shown in FIG. In FIG. 2, reference numerals 1 and 2 have the same meanings as in FIG. 1, and 3 means ceramics.
本発明において、成形用バインダはポリビニルブチラー
ルやポリエチレンなどの有機高分子化合物やシリコンイ
ミド化合物やポリシラン化合物などの有機Si高分子化合
物などを適量添加し、好ましくは８〜１５重量部添加
し、成形体の粒子体積充てん率を６０％以上とするのが
好ましい。In the present invention, as the molding binder, an appropriate amount of an organic polymer compound such as polyvinyl butyral or polyethylene, or an organic Si polymer compound such as a silicon imide compound or a polysilane compound is added, and preferably 8 to 15 parts by weight is added. It is preferable that the particle volume filling rate is 60% or more.
成形方法は、射出成形、プレス成形、ラバープレス成
形、押出し成形、金型粉末成形など形状と要求特性及び
要求形状に応じて成形方法を選択する。As a molding method, a molding method such as injection molding, press molding, rubber press molding, extrusion molding, mold powder molding, etc. is selected according to the required characteristics and required shape.
金属粒子及び磁性粒子は、市販のものをそのまま用いる
ことができる。またルミなどにより粉砕した丸みを帯び
た粒子を使用してもよい。Commercially available metal particles and magnetic particles can be used as they are. Alternatively, rounded particles crushed with lumi or the like may be used.
本発明において、複合セラミツクス焼結体の気孔中に樹
脂、油、粒子などを含浸することも可能であり、摺動部
材へも応用可能である。In the present invention, it is possible to impregnate the pores of the composite ceramics sintered body with resin, oil, particles or the like, and it is also applicable to a sliding member.
本発明によれば、磁性粒子を金属粒子から生成した窒化
物又は酸化物で結合させることにより、焼結時寸法変化
率が小さく、電気抵抗率が導電体から絶縁体まで任意に
制御可能な磁性セラミツクスが得られる。According to the present invention, by binding magnetic particles with a nitride or an oxide generated from metal particles, the dimensional change rate during sintering is small, and the electrical resistivity can be arbitrarily controlled from a conductor to an insulator. Ceramics are obtained.
なお、本発明方法では、無機化合物粒子を始めから存在
させて焼結を行つてもよい。In addition, in the method of the present invention, the inorganic compound particles may be present from the beginning to perform sintering.
以下、本発明を実施例により更に具体的に説明するが、
本発明はこれら実施例に限定されない。Hereinafter, the present invention will be described in more detail with reference to Examples.
The present invention is not limited to these examples.
実施例１ 平均粒径１μｍの金属Si粉末３０重量％と磁性材料とし
て平均粒径２０μｍのFe粉末７０重量％に成形用バイン
ダとしてポリエチレン系ワツクス、合成ワツクス、ステ
アリン酸などの有機バインダを９重量部添加し加圧ニー
ダで１６０℃、５時間混練した。そして、混練物を破砕
した後、供試原料とした。これらの原料をメカニカルプ
レスを用いて成形圧力１０００kgfcm2、温度１６０℃で
内径３０mm、外径５０mm、厚さ１０mmのものに成形し
た。得られた成形体の粒子体積充てん率は６０体積％以
上である。この成形体をアルゴン雰囲気中３℃／ｈの昇
温速度で５００℃まで加熱し、成形バインダを除去した
後、３０００ガウスの磁場中で窒素雰囲気中８００℃か
ら１５００℃まで段階的に長時間かけて加熱し、焼結体
を得た。得られた焼結体の特性を第１表に示す。これよ
り、本発明品は、絶縁体の磁性セラミツクスであること
が判る。Example 1 30 wt% of metal Si powder having an average particle size of 1 μm, 70 wt% of Fe powder having an average particle size of 20 μm as a magnetic material, and 9 parts by weight of an organic binder such as polyethylene wax, synthetic wax and stearic acid as a molding binder. The mixture was added and kneaded with a pressure kneader at 160 ° C. for 5 hours. Then, the kneaded product was crushed and used as a test material. These raw materials were molded using a mechanical press at a molding pressure of 1000 kgfcm 2 and a temperature of 160 ° C. to have an inner diameter of 30 mm, an outer diameter of 50 mm and a thickness of 10 mm. The particle volume filling rate of the obtained molded body is 60% by volume or more. This molded body was heated to 500 ° C. at a temperature rising rate of 3 ° C./h in an argon atmosphere, and after removing the molding binder, it was gradually stepped from 800 ° C. to 1500 ° C. in a nitrogen atmosphere in a magnetic field of 3000 Gauss for a long time. And heated to obtain a sintered body. The characteristics of the obtained sintered body are shown in Table 1. From this, it is understood that the product of the present invention is an insulating magnetic ceramic.
実施例２ 実施例１と同様にして平均粒径１μｍのTi粉末３０重量
％及び平均粒径１μｍのγ−Fe2O3粉末70重量％を同様
に成形したのち、３５００ガウスの磁場中で窒化性雰囲
気中５００℃から１３００℃まで段階的に長時間かけて
加熱し、焼結体を得た。得られた焼結体の特性を第２表
に示す。これより、本発明品は、導電体の磁性セラミツ
クスであることが判る。 Example 2 30% by weight of Ti powder having an average particle size of 1 μm and 70% by weight of γ-Fe 2 O 3 powder having an average particle size of 1 μm were molded in the same manner as in Example 1, and then nitrided in a magnetic field of 3500 gauss. The mixture was heated stepwise for a long time from 500 ° C. to 1300 ° C. in a neutral atmosphere to obtain a sintered body. The properties of the obtained sintered body are shown in Table 2. From this, it is understood that the product of the present invention is a magnetic ceramic of an electric conductor.
実施例３ 実施例１と同様にして平均粒径１μｍのAl粉末３０重量
％及び平均粒径１μｍのCrO2粉末７０重量％を同様に成
形したのち、３５００ガウスの磁場中で酸化雰囲気中６
００℃から１４００℃まで段階的に長時間かけて加熱
し、焼結体を得た。得られた焼結体の特性を第３表に示
す。これより、本発明品は、絶縁体の磁性セラミツクス
であることが判る。 Example 3 30% by weight of Al powder having an average particle size of 1 μm and 70% by weight of CrO 2 powder having an average particle size of 1 μm were molded in the same manner as in Example 1, and then, in an oxidizing atmosphere in a magnetic field of 3500 gauss.
By gradually heating from 00 ° C to 1400 ° C over a long period of time, a sintered body was obtained. The characteristics of the obtained sintered body are shown in Table 3. From this, it is understood that the product of the present invention is an insulating magnetic ceramic.
実施例４〜１０ 実施例１と同様にして平均粒径１μｍのTi粉末、第４表
に示す無機化合物及び平均粒径１μｍのγ−Fe2O3粉末
５０重量％を同様に成形したのち、５０００ガウスの磁
場中で酸化雰囲気中６００℃から１４００℃の間で段階
的に長時間かけて加熱し焼結体を得た。得られた焼結体
の特性を第４表に示す。これより、本発明品は、電気抵
抗率可能の磁性セラミツクスであることが判る。 Examples 4 to 10 In the same manner as in Example 1, Ti powder having an average particle size of 1 μm, inorganic compounds shown in Table 4 and 50% by weight of γ-Fe 2 O 3 powder having an average particle size of 1 μm were molded in the same manner. A sintered body was obtained by heating stepwise for a long time between 600 ° C. and 1400 ° C. in an oxidizing atmosphere in a magnetic field of 5000 gauss. The characteristics of the obtained sintered body are shown in Table 4. From this, it is understood that the product of the present invention is a magnetic ceramic capable of electric resistivity.
〔発明の効果〕 本発明によれば、耐酸化性、耐熱性、耐食性に優れ、焼
結時の寸法変化率が小さく、電気抵抗率が導電体から絶
縁体まで可変可能な磁性セラミツクスが容易に得られ
る。これにより、焼結後の加工コストをほとんど必要と
しないので、特殊環境下での電磁石、電力用変圧器の磁
心、磁気シールド、磁気ヘツド、漏電警報器、大、小回
転機、電動機、センサー、電子ビーム集束用など各種用
途に対応できる。航空、宇宙関係、鉄鋼、海洋開発など
の分野への磁性セラミツクスの利用範囲を拡大する。 [Advantages of the Invention] According to the present invention, a magnetic ceramic having excellent oxidation resistance, heat resistance, corrosion resistance, a small dimensional change rate during sintering, and a variable electrical resistivity from a conductor to an insulator can be easily obtained. can get. As a result, there is almost no processing cost after sintering, so electromagnets in special environments, magnetic cores of power transformers, magnetic shields, magnetic heads, earth leakage alarms, large and small rotating machines, electric motors, sensors, It can be used for various purposes such as electron beam focusing. Expand the application range of magnetic ceramics in fields such as aviation, space, steel and marine development.
第１図は、本発明の磁性セラミツクスの中味の１例の断
面模式図であり、第２図は本発明の磁性セラミツクスの
１例の断面模式図である。 １：磁性粒子、２及び３：セラミツクスFIG. 1 is a schematic sectional view of one example of the contents of the magnetic ceramics of the present invention, and FIG. 2 is a schematic sectional view of one example of the magnetic ceramics of the present invention. 1: magnetic particles, 2 and 3: ceramics
───────────────────────────────────────────────────── フロントページの続き (72)発明者 山下 信行 茨城県日立市久慈町4026番地 株式会社日 立製作所日立研究所内 (72)発明者 長瀬 博 茨城県日立市久慈町4026番地 株式会社日 立製作所日立研究所内 (72)発明者 丹野 清彦 茨城県日立市久慈町4026番地 株式会社日 立製作所日立研究所内 (72)発明者 有本 象治 神奈川県横浜市戸塚区吉田町292番地 株 式会社日立製作所生産技術研究所内 (72)発明者 常楽 文夫 茨城県日立市東多賀町１丁目１番１号 株 式会社日立製作所多賀工場内 (72)発明者 安井 英二 東京都千代田区神田駿河台４丁目６番地 株式会社日立製作所内 (56)参考文献 特開 昭58−167473（ＪＰ，Ａ) 特開 昭60−24346（ＪＰ，Ａ) ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Nobuyuki Yamashita 4026 Kuji Town, Hitachi City, Hitachi, Ibaraki Prefecture Hitate Manufacturing Co., Ltd.Hitachi Research Laboratory (72) Inventor Hiroshi Nagase 4026 Kuji Town, Hitachi City, Ibaraki Prefecture Hitate Manufacturing Co., Ltd. Hitachi Research Laboratory (72) Inventor Kiyohiko Tanno 4026 Kuji-cho, Hitachi City, Ibaraki Prefecture Hitachi Co., Ltd. Production Engineering Laboratory (72) Inventor Fumio Jouraku 1-1-1, Higashitaga-cho, Hitachi City, Ibaraki Hitachi Ltd. Taga Factory (72) Inventor Eiji Yasui 4-6 Kanda Surugadai, Chiyoda-ku, Tokyo Inside Hitachi (56) Reference JP-A-58-167473 (JP, A) JP-A-60-24346 (JP, A)
Claims (5)
iN、TiO2、及びAl2O3よりなる群から選択した少なくと
も１種のセラミツクスで互いに結合された気孔率４０％
以下、磁性粒子含有率９０体積％以下の焼結体であり、
その表面層がセラミツクスで被覆されているものである
ことを特徴とする磁性セラミツクス。1. An inorganic compound particle and a magnetic particle are composed of Si 3 N 4 and T.
40% porosity bonded to each other by at least one ceramic selected from the group consisting of iN, TiO 2 , and Al 2 O 3.
Hereinafter, a sintered body having a magnetic particle content of 90% by volume or less,
A magnetic ceramic, the surface layer of which is coated with ceramics.
体あるいはFe、Co、Ni、Gd、Dy、Mn、Cr又はCuの化合物
の１種以上である請求項１記載の磁性セラミツクス。2. The magnetic particles are Fe, Co, Ni, Gd or Dy alone or one or more compounds of Fe, Co, Ni, Gd, Dy, Mn, Cr or Cu. Magnetic ceramics.
る方法において、Si、Ti及びAlよりなる群から選択した
少なくとも１種の金属粒子と、磁性粒子とを含有する成
形体を、該金属粒子がSiを含有する場合には窒化性ガス
雰囲気中、Alを含有する場合には酸化性ガス雰囲気中、
またTiを含有する場合には窒化性又は酸化性ガス雰囲気
中で加熱し、次いで得られた焼結体の表面層をセラミツ
クスで被覆することを特徴とする磁性セラミツクスの製
造法。3. The method for producing a magnetic ceramic according to claim 1, wherein a molded body containing magnetic particles and at least one kind of metal particles selected from the group consisting of Si, Ti and Al is used. In the nitriding gas atmosphere when containing Si, in the oxidizing gas atmosphere when containing Al,
When Ti is contained, it is heated in a nitriding or oxidizing gas atmosphere, and then the surface layer of the obtained sintered body is coated with ceramics, which is a method for producing a magnetic ceramics.
のである請求項３記載の磁性セラミツクスの製造法。4. The method for producing a magnetic ceramic according to claim 3, wherein the molded body contains inorganic compound particles.
おいて段階的に加熱して行う請求項３記載の磁性セラミ
ツクスの製造法。5. The method for producing a magnetic ceramic according to claim 3, wherein the heating is performed by heating stepwise at a temperature of 500 to 1500 ° C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63093533A JPH0625034B2 (en) | 1988-04-18 | 1988-04-18 | Magnetic ceramics and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63093533A JPH0625034B2 (en) | 1988-04-18 | 1988-04-18 | Magnetic ceramics and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01264959A JPH01264959A (en) | 1989-10-23 |
| JPH0625034B2 true JPH0625034B2 (en) | 1994-04-06 |
Family
ID=14084934
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63093533A Expired - Lifetime JPH0625034B2 (en) | 1988-04-18 | 1988-04-18 | Magnetic ceramics and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0625034B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5518641A (en) * | 1992-11-25 | 1996-05-21 | Matsushita Electric Industrial Co., Ltd. | Magnetic material and manufacturing method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58167473A (en) * | 1982-03-25 | 1983-10-03 | 日本電気株式会社 | Manufacture of ferrite composite body |
| DE3422281A1 (en) * | 1983-06-20 | 1984-12-20 | Allied Corp., Morristown, N.J. | Process for manufacturing mouldings from magnetic metal alloys, and mouldings thus produced |
-
1988
- 1988-04-18 JP JP63093533A patent/JPH0625034B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01264959A (en) | 1989-10-23 |
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