JPS6314842B2 - - Google Patents
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- Publication number
- JPS6314842B2 JPS6314842B2 JP58190249A JP19024983A JPS6314842B2 JP S6314842 B2 JPS6314842 B2 JP S6314842B2 JP 58190249 A JP58190249 A JP 58190249A JP 19024983 A JP19024983 A JP 19024983A JP S6314842 B2 JPS6314842 B2 JP S6314842B2
- Authority
- JP
- Japan
- Prior art keywords
- magnet
- electrical resistance
- oxide
- magnets
- atmosphere
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 27
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 11
- 238000005245 sintering Methods 0.000 claims description 11
- 229910052760 oxygen Inorganic materials 0.000 claims description 9
- 229910052788 barium Inorganic materials 0.000 claims description 8
- 238000010298 pulverizing process Methods 0.000 claims description 8
- 229910052712 strontium Inorganic materials 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- 150000001875 compounds Chemical class 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 238000001354 calcination Methods 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 9
- 239000002245 particle Substances 0.000 description 8
- 229910000828 alnico Inorganic materials 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 229910004298 SiO 2 Inorganic materials 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- BDAGIHXWWSANSR-NJFSPNSNSA-N hydroxyformaldehyde Chemical compound O[14CH]=O BDAGIHXWWSANSR-NJFSPNSNSA-N 0.000 description 2
- 229910000018 strontium carbonate Inorganic materials 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- -1 B 2 O 3 Inorganic materials 0.000 description 1
- 229910015902 Bi 2 O 3 Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 235000010216 calcium carbonate Nutrition 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Magnetic Ceramics (AREA)
- Hard Magnetic Materials (AREA)
Description
本発明は、六方晶酸化物永久磁石の電気抵抗の
改良に関するものである。
基本化学式MO―6Fe2O3（ＭはBaまたはSr）を
もつフエライト磁石は、原料が豊富なことや、大
量生産に適していることから安価であり、広く使
用されている。
フエライト磁石の特徴として、アルニコ等金属
磁石に比べると、残留磁束密度Brが劣るものの
高い保磁力Hcをもち、磁石長の短い扁平な磁石
に適することや、比重が小さく軽量化できるこ
と、温度係数が大きいこと、などの点と共に、高
い電気抵抗をもつことが上げられる。すなわちア
ルニコ等の金属磁石の電気抵抗は、約50μ・Ω・
cmであるが、フエライト磁石においては、単結晶
において約104Ω・cm、また1μ以下の粒子による
多結晶では約108Ω・cmという高い電気抵抗をも
つことが知られている。
Coの値段の急騰により、アルニコ等金属磁石
からフエライト磁石への切り換えが幅広く進んで
いるが、その場合、両磁石の磁気特性の相違に応
じて回路の設計変更を行つても、その電気抵抗の
違いにより、製品に影響を及ぼすことがある。
例えば、スピーカに用いられる磁石について
は、アルニコ磁石が、フエライト磁石に比べて、
音質が秀れているとされており、これはアルニコ
磁石の高い導電性（低い電気抵抗）をもつことに
よるといわれている。
このように、アルニコ等金属磁石からフエライ
ト磁石へ切り換える場合に、フエライト磁石の電
気抵抗がアルニコ等金属磁石に近いほど有利な場
合がある。
しかし、前述したようにMO―6Fe2O3（ＭはBa
またはSr）は単結晶において約104Ω・cmの電気
抵抗をもつために、空孔を含む多結晶のフエライ
ト磁石においては、さらに大きい電気抵抗を示し
ており、この電気抵抗を磁気特性を損うことなく
下げることは困難であつた。
本発明は、磁気特性を劣化させることなく、電
気抵抗を低くしたフエライト磁石を製造する方法
を提供することを目的とする。
本発明は、酸化物永久磁石の主原料としての酸
化鉄と、BaあるいはSrの化合物を含む原料混合
物を調整し、該混合物を、仮焼、粉砕、成型、焼
結して酸化物永久磁石を製造する方法において、
上記粉砕工程中から上記成型工程に入る前の段階
において、該粉砕物を煮沸洗浄して未反応のMO
（ＭはBaおよびSrの少なくとも一種）を除去した
後酸化鉄を加えて、Fe2O3／MOが6.14〜6.69を満
足するように調整することを特徴とした酸化物永
久磁石の製造方法である。
従来のフエライト磁石の製造方法は、酸化鉄と
BaまたはSrの化合物をモル比ｎ（＝Fe2O3／MO）
にて5.3〜5.9となるように配合し、約1200℃以上
で仮焼した後、平均粒径が約1.1μ以下となるよう
に粉砕し、これを磁場中成形後焼結する工程を採
つていた。
これに対し、本発明では、仮焼物の粉砕後（あ
るいは粉砕中から粉砕後にかけて）、煮沸洗浄す
ることによつて未反応のBaO及びSrOを洗い流し
て、純粋なMO・6Fe2O3粉末を得、その後、上記
のｎが6.14〜6.69となるようにFe2O3を添加し、
これを0.1〜６％O2雰囲気中で1250゜〜1400℃で熱
処理してFe3O4を析出させ、この熱処理したもの
を粉砕して、成形工程へ回すもので、このような
工程を介在させることによつて、固有抵抗が１〜
103Ω・cmで、磁石特性が（BH）nax≧3.6M・Ｇ・
Oeをもつ秀れた酸化物永久磁石を得ることがで
きる。
本発明において、仮焼物の粉砕後煮沸洗浄して
BaOやSrO等のMOを除去するのは、MOが介在
すると、後工程で添加するFe2O3がFe3O4に変化
しにくくなり、電気抵抗の増加をもたらすためで
ある。
また、Fe2O3を添加してｎが6.14〜6.69となる
ようにするのは、ｎが6.14以下では、フリーの
Fe2O3が2wt％以下となつて電気抵抗を下げられ
ないためであり、また6.69を越えると、フリーの
Fe2O3が10wt％を越えてしまつてHcの劣化とと
もに（BH）naxを劣化させるためである。
0.1〜６％O2雰囲気で1250〜1400℃で熱処理を
行うことは、添加したFe2O3を、その後の焼結過
程でFe3O4に変化させることを促進し、密度を上
げ高い磁石特性を得るためである。この熱処理
を行なわない場合、あるいは、上記のO2雰囲
気以外の雰囲気で熱処理した場合、あるいはこ
の熱処理を行なわずに焼結を上記と同じ酸素雰囲
気で行なつた場合のいずれにおいても、電気抵抗
と磁石特性の両方を満足した磁石は得られなかつ
た。即ち、0.1〜６％O2雰囲気で1250〜1400℃で
熱処理した後焼結することによつて、１〜103Ω.
cm程度の磁気特性に秀れた磁石が製造できる。熱
処理の雰囲気を0.1％O2以下とすると、磁石のHc
が小さくなり、また６％O2以上では、固有抵抗
が高くなる。
なお、この発明の場合、焼結温度は、1200℃〜
1250℃が適当で、1200℃以下では磁石のBrと共
にHcも低下し、1250℃以上ではHcが低下する。
1200℃よりのHcの増加はFe3O4の一部が1200℃
よりFe2O3に再びもどることによるものとみられ
る。
なお、本発明の磁石の特性向上のため、CaO，
SiO2，Bi2O3，B2O3，Al2O3，Cr2O3やこれらの
化合物を仮焼前、熱処理時、粉砕時に添加して
も、電気抵抗に影響を及ぼさないことが確認され
ており、これら添加物によつて限定されるもので
はない。
以下、第１表に示す原料を用いた本発明の実施
例について説明する。
The present invention relates to improving the electrical resistance of hexagonal oxide permanent magnets. Ferrite magnets, which have the basic chemical formula MO-6Fe 2 O 3 (M is Ba or Sr), are inexpensive and widely used because they have abundant raw materials and are suitable for mass production. Ferrite magnets have a lower residual magnetic flux density Br than metal magnets such as alnico, but have a high coercive force Hc, making them suitable for flat magnets with short magnet lengths, having a small specific gravity, making them lightweight, and having a low temperature coefficient. In addition to being large, it also has high electrical resistance. In other words, the electrical resistance of metal magnets such as alnico is approximately 50μ・Ω・
However, it is known that ferrite magnets have a high electrical resistance of about 10 4 Ω·cm for single crystals, and about 10 8 Ω·cm for polycrystals made of particles of 1 μm or less. Due to the sharp rise in the price of Co, there is a widespread switch from metal magnets such as alnico to ferrite magnets. Differences may affect the product. For example, regarding magnets used in speakers, alnico magnets have a higher
The sound quality is said to be excellent, and this is said to be due to the high conductivity (low electrical resistance) of alnico magnets. As described above, when switching from a metal magnet such as alnico to a ferrite magnet, it may be advantageous if the electrical resistance of the ferrite magnet is closer to that of the metal magnet such as alnico. However, as mentioned above, MO-6Fe 2 O 3 (M is Ba
or Sr) has an electrical resistance of approximately 10 4 Ω・cm in a single crystal, a polycrystalline ferrite magnet containing voids has an even higher electrical resistance, and this electrical resistance can be used to impair magnetic properties. It was difficult to lower it without causing damage. An object of the present invention is to provide a method for manufacturing a ferrite magnet with low electrical resistance without deteriorating magnetic properties. The present invention prepares a raw material mixture containing iron oxide as the main raw material of an oxide permanent magnet and a compound of Ba or Sr, and then calcinates, crushes, molds, and sinters the mixture to produce an oxide permanent magnet. In the method of manufacturing,
During the above-mentioned pulverization process and before entering the above-mentioned molding process, the pulverized material is boiled and washed to remove unreacted MO.
(M is at least one of Ba and Sr) is removed, and then iron oxide is added to adjust the Fe 2 O 3 /MO to satisfy 6.14 to 6.69. be. The traditional method of manufacturing ferrite magnets is to use iron oxide and
Ba or Sr compound at molar ratio n (=Fe 2 O 3 /MO)
The process involves blending the powder to a particle size of 5.3 to 5.9, calcining it at about 1200℃ or higher, pulverizing it to an average particle size of about 1.1μ or less, and sintering it after forming it in a magnetic field. was. In contrast, in the present invention, after pulverizing the calcined material (or during and after pulverizing), unreacted BaO and SrO are washed away by boiling and cleaning, and pure MO・6Fe 2 O 3 powder is obtained. After that, Fe 2 O 3 is added so that the above n is 6.14 to 6.69,
This is heat treated at 1250° to 1400°C in an atmosphere of 0.1 to 6% O 2 to precipitate Fe 3 O 4 , and this heat treated material is crushed and sent to the molding process, without intervening such a process. By setting the specific resistance to 1~
At 10 3 Ω・cm, the magnetic properties are (BH) nax ≧3.6M・G・
Excellent oxide permanent magnets with Oe can be obtained. In the present invention, the calcined material is boiled and washed after being crushed.
The reason why MOs such as BaO and SrO are removed is that when MOs are present, it becomes difficult for Fe 2 O 3 added in a later step to change into Fe 3 O 4 , resulting in an increase in electrical resistance. Also, adding Fe 2 O 3 to make n 6.14 to 6.69 means that when n is 6.14 or less, free
This is because the electrical resistance cannot be lowered when Fe 2 O 3 is less than 2wt%, and when it exceeds 6.69, free
This is because when Fe 2 O 3 exceeds 10 wt%, it deteriorates (BH) nax as well as Hc. Heat treatment at 1250-1400℃ in a 0.1-6% O 2 atmosphere promotes the conversion of added Fe 2 O 3 to Fe 3 O 4 in the subsequent sintering process, increasing the density and creating a high-quality magnet. This is to obtain characteristics. Regardless of whether this heat treatment is not performed, or if the heat treatment is performed in an atmosphere other than the above O 2 atmosphere, or if the sintering is performed without this heat treatment in the same oxygen atmosphere as above, the electrical resistance A magnet satisfying both magnetic properties could not be obtained. That is, by heat treating at 1250 to 1400°C in a 0.1 to 6% O 2 atmosphere and then sintering, the resistance to 1 to 10 3 Ω.
It is possible to manufacture magnets with excellent magnetic properties on the order of cm. If the heat treatment atmosphere is 0.1% O2 or less, the magnet's Hc
becomes small, and at 6% O 2 or more, the specific resistance becomes high. In addition, in the case of this invention, the sintering temperature is 1200°C ~
A temperature of 1250°C is appropriate; below 1200°C, Hc will decrease along with the Br of the magnet, and above 1250°C, Hc will decrease.
The increase in Hc from 1200℃ is due to a part of Fe 3 O 4 at 1200℃
This seems to be due to the change back to Fe 2 O 3 . In addition, in order to improve the characteristics of the magnet of the present invention, CaO,
Even if SiO 2 , Bi 2 O 3 , B 2 O 3 , Al 2 O 3 , Cr 2 O 3 and their compounds are added before calcination, during heat treatment, or during pulverization, they do not affect the electrical resistance. It is not limited to these additives. Examples of the present invention using the raw materials shown in Table 1 will be described below.
【表】【table】
【表】
実施例 １
第１表に示す酸化鉄と炭酸バリウムをｎ＝5.6
となるよう配合し、混合後1260℃で1.5時間仮焼
した。この仮焼品にCaCO3を0.54wt％とSiO2を
0.25％添加して平均粒径が0.95μに粉砕し、２つ
に分割し、一方を5KOeの磁場中で、500Kg／cm2
の圧力で成形し、1240℃で焼結した。この従来の
方法によるものをとする。また一方の粉砕上り
を湯を流出させつつ３時間煮沸し、その後
Fe2O3／BaOモル比が6.4となるようFe2O3を混合
し、５％O2＋95％CO2の雰囲気中で1350℃で２時
間熱処理し、これを再び0.95μに粉砕し、と同
様に成形焼結を行つた。この方法によるものを
とする。焼結体を研摩加工後、磁気特性及びホイ
ストンブリツジにより、固定抵抗を測定した。
また磁石中の総鉄分を分析し、Fe2O3／BaOモ
ル比を示した。[Table] Example 1 Iron oxide and barium carbonate shown in Table 1 were mixed with n=5.6
After mixing, the mixture was calcined at 1260°C for 1.5 hours. 0.54wt% of CaCO 3 and SiO 2 were added to this calcined product.
Add 0.25%, grind to an average particle size of 0.95μ, divide into two, and place one in a magnetic field of 5KOe to 500Kg/cm 2
It was molded at a pressure of 1,240°C and sintered at 1240°C. This conventional method is used. In addition, one of the crushed pieces was boiled for 3 hours while draining the hot water, and then
Fe 2 O 3 was mixed so that the Fe 2 O 3 /BaO molar ratio was 6.4, heat treated at 1350°C for 2 hours in an atmosphere of 5% O 2 + 95% CO 2 , and this was ground again to 0.95μ. Shaping and sintering was performed in the same manner as in . This method shall be used. After polishing the sintered body, fixed resistance was measured using magnetic properties and Whiston Bridge. The total iron content in the magnet was also analyzed and the Fe 2 O 3 /BaO molar ratio was shown.
【表】
本発明によりHcが若干低下したもののBrが高
くなり、従来と変わらない（BH）naxをもち、9.8
×10という低い電気抵抗をもつ磁石が得られた。
実施例 ２
第１表に示す酸化鉄と炭酸ストロンチウムをｎ
＝5.8となるよう配合し、混合後1300℃で２時間
仮焼した。この仮焼品にCaCO3が0.9wt％と
SiO20.5wt％添加し平均粒径が0.81μに粉砕し、２
つに分割し、5KOeの磁場中で500Kg／cm2の圧力
で成形後、1160℃ 1180℃ 1200℃ 1220℃
1240℃ 1260℃ 1280℃で焼結し、この従来の方
法によるものをとする。また一方の粉砕より湯
を流出させながら、３時間煮沸し、その後
Fe2O3／SrOが6.6となるようFe2O3を混合し、４
％O2＋96％CO2の雰囲気中で1350℃で２時間熱処
理し、これを再び平均粒径が0.80μに粉砕し、
と同様に成形、焼結した。この方法によるものを
とする。焼結上りを実施例１と同様に測定した
結果を第２表に示した。[Table] The present invention slightly lowers Hc, but increases Br, which is the same as before (BH). Nax is 9.8
A magnet with a low electrical resistance of ×10 was obtained. Example 2 Iron oxide and strontium carbonate shown in Table 1 were
= 5.8, and after mixing, it was calcined at 1300°C for 2 hours. CaCO 3 is 0.9wt% in this calcined product.
Add 0.5wt% of SiO 2 and grind to an average particle size of 0.81μ.
After molding at a pressure of 500Kg/ cm2 in a magnetic field of 5KOe, 1160℃ 1180℃ 1200℃ 1220℃
Sintered at 1240℃ 1260℃ 1280℃ by this conventional method. Boil for 3 hours while letting hot water flow out from one side of the grinder, then
Mix Fe 2 O 3 so that Fe 2 O 3 /SrO is 6.6,
Heat treated at 1350°C for 2 hours in an atmosphere of %O 2 + 96% CO 2 and crushed again to an average particle size of 0.80μ.
It was molded and sintered in the same manner. This method shall be used. The sintering completion was measured in the same manner as in Example 1, and the results are shown in Table 2.
【表】【table】
【表】
本発明により、電気抵抗が下がつた磁石が得ら
れる。また焼結温度により若干の電気抵抗の上昇
がみられることは、Fe3O4→Fe2O3の変化がおこ
つているとみられる。
実施例 ３
第１表に示す酸化鉄と炭酸ストロンチウムをｎ
＝5.7となるよう配合し、混合後1280℃で２時間
仮焼した。この仮焼品に0.9wt％のCaCO3と0.5wt
％のSiO2を添加し、平均粒径が1.05μとなるよう
粉砕し、湯を流出させながら３時間煮沸し、その
後Fe2O3／SrOモル比が6.1 6.25 6.40 6.55 6.70
6.85となるようFe2O3を添加し、それぞれを
とする。これらを1.0％O2＋99％CO2の
雰囲気で1280℃で３時間熱処理し、再び粉砕して
平均粒径が0.79μとした。このスラリーを5.0KOe
の磁場中で500Kg／cm2で成形し、1220℃で1.5時間
焼結した。この焼結上りを実施例１と同様に測定
した結果を表３に示した。[Table] According to the present invention, a magnet with reduced electrical resistance can be obtained. Furthermore, the fact that the electrical resistance slightly increases with the sintering temperature seems to be due to a change from Fe 3 O 4 →Fe 2 O 3 . Example 3 Iron oxide and strontium carbonate shown in Table 1 were
= 5.7, and after mixing, it was calcined at 1280°C for 2 hours. This calcined product contains 0.9wt% CaCO3 and 0.5wt%
% of SiO 2 was added, crushed so that the average particle size was 1.05μ, boiled for 3 hours with hot water flowing out, and then the Fe 2 O 3 /SrO molar ratio was 6.1 6.25 6.40 6.55 6.70
Add Fe 2 O 3 so that it becomes 6.85, and let each be . These were heat treated at 1280° C. for 3 hours in an atmosphere of 1.0% O 2 +99% CO 2 and ground again to give an average particle size of 0.79 μm. 5.0KOe of this slurry
It was molded in a magnetic field of 500 kg/cm 2 and sintered at 1220°C for 1.5 hours. The sintering rate was measured in the same manner as in Example 1, and the results are shown in Table 3.
【表】【table】
【表】
Fe2O3添加後のモル比が6.1では固有抵抗が高
く、6.7をこえると、磁気特性が劣化する。しか
し、6.25〜6.55では、電気抵抗の小さい磁気特性
に秀れた磁石が得られた。
以上実施例をもつて本発明の説明を行つた。酸
化鉄とBaまたはSrの化合物をｎ＝5.3〜5.9となる
よう配合、仮焼、粉砕後BaOまたはSrOを煮沸洗
浄した後ｎが6.14〜6.69となるようFe2O3を混合
し、0.1〜６％O2のガス雰囲気中で熱処理した後、
粉砕、成形、焼結することにより、固有抵抗が１
〜103Ω・cmである磁気特性に秀れた酸化物永久
磁石を提供できる。
なお、本発明は実施例に用いた添加物等に制限
されないことが確認されている。[Table] When the molar ratio after addition of Fe 2 O 3 is 6.1, the specific resistance is high, and when it exceeds 6.7, the magnetic properties deteriorate. However, with 6.25 to 6.55, a magnet with low electrical resistance and excellent magnetic properties was obtained. The present invention has been explained above using examples. A compound of iron oxide and Ba or Sr is mixed so that n=5.3 to 5.9, and after calcining and pulverizing BaO or SrO is boiled and washed, Fe 2 O 3 is mixed so that n is 6.14 to 6.69, and then Fe 2 O 3 is mixed so that n is 6.14 to 6.69. After heat treatment in a gas atmosphere of 6% O2 ,
By crushing, molding, and sintering, the specific resistance is reduced to 1.
It is possible to provide an oxide permanent magnet with excellent magnetic properties of ~10 3 Ω·cm. It has been confirmed that the present invention is not limited to the additives used in the examples.
Claims (1)
BaあるいはSrの化合物を含む原料混合物を調整
し、該混合物を、仮焼、粉砕、成型、焼結して酸
化物永久磁石を製造する方法において、上記粉砕
工程中から上記成型工程に入る前の段階において
該粉砕物を煮沸洗浄して未反応のMO（ＭはBaお
よびSrの少なくとも一種）を除去した後、酸化
鉄を加えてFe2O3／MO（モル比）が6.14〜6.69を
満足するように調整し、これを0.1〜６％O2雰囲
気中で1250℃〜1400℃で熱処理した後成形粉末に
粉砕することを特徴とした酸化物永久磁石の製造
方法。1 Iron oxide as the main raw material for oxide permanent magnets,
In a method of preparing an oxide permanent magnet by preparing a raw material mixture containing a Ba or Sr compound, and then calcining, crushing, molding, and sintering the mixture, the steps from during the pulverizing process to before entering the molding process are performed. In the step, the pulverized material is boiled and washed to remove unreacted MO (M is at least one of Ba and Sr), and then iron oxide is added to satisfy a Fe 2 O 3 /MO (molar ratio) of 6.14 to 6.69. 1. A method for producing an oxide permanent magnet, which comprises adjusting the oxide permanent magnet so that the magnet is heated at 1250° C. to 1400° C. in a 0.1 to 6% O 2 atmosphere, and then pulverizing it into a shaped powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58190249A JPS6081803A (en) | 1983-10-12 | 1983-10-12 | Manufacture of oxide permanent magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58190249A JPS6081803A (en) | 1983-10-12 | 1983-10-12 | Manufacture of oxide permanent magnet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6081803A JPS6081803A (en) | 1985-05-09 |
| JPS6314842B2 true JPS6314842B2 (en) | 1988-04-01 |
Family
ID=16254988
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58190249A Granted JPS6081803A (en) | 1983-10-12 | 1983-10-12 | Manufacture of oxide permanent magnet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6081803A (en) |
-
1983
- 1983-10-12 JP JP58190249A patent/JPS6081803A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6081803A (en) | 1985-05-09 |
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