JPH03123004A - Manufacture of highly efficient sr ferrite magnet - Google Patents
Manufacture of highly efficient sr ferrite magnetInfo
- Publication number
- JPH03123004A JPH03123004A JP2040346A JP4034690A JPH03123004A JP H03123004 A JPH03123004 A JP H03123004A JP 2040346 A JP2040346 A JP 2040346A JP 4034690 A JP4034690 A JP 4034690A JP H03123004 A JPH03123004 A JP H03123004A
- Authority
- JP
- Japan
- Prior art keywords
- iron oxide
- oxide
- ferrite magnet
- mill scale
- magnetic field
- 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.)
- Pending
Links
- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims abstract description 52
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 35
- 229910052742 iron Inorganic materials 0.000 claims abstract description 17
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims abstract description 11
- 239000002245 particle Substances 0.000 claims description 16
- 238000005245 sintering Methods 0.000 claims description 7
- 238000010298 pulverizing process Methods 0.000 claims description 5
- 238000007254 oxidation reaction Methods 0.000 abstract description 16
- 230000003647 oxidation Effects 0.000 abstract description 15
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract description 12
- 238000000034 method Methods 0.000 abstract description 5
- 230000001590 oxidative effect Effects 0.000 abstract description 4
- 238000005188 flotation Methods 0.000 abstract description 3
- 239000000843 powder Substances 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract 1
- 238000000465 moulding Methods 0.000 description 10
- 238000002156 mixing Methods 0.000 description 8
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 7
- 238000010304 firing Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- LEDMRZGFZIAGGB-UHFFFAOYSA-L strontium carbonate Chemical compound [Sr+2].[O-]C([O-])=O LEDMRZGFZIAGGB-UHFFFAOYSA-L 0.000 description 2
- 229910000018 strontium carbonate Inorganic materials 0.000 description 2
- -1 Coo Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052595 hematite Inorganic materials 0.000 description 1
- 239000011019 hematite Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 1
- 238000007885 magnetic separation Methods 0.000 description 1
- 238000010299 mechanically pulverizing process Methods 0.000 description 1
- 239000011802 pulverized particle Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Landscapes
- Compounds Of Iron (AREA)
- Magnetic Ceramics (AREA)
- Hard Magnetic Materials (AREA)
Abstract
Description
【発明の詳細な説明】
利用産業分野
この発明は、鉄鉱石またはミルスケールより得られた酸
化鉄を用いて、高性能Ｓｒフェライト磁石を製造する方
法に係り、酸化鉄を所要粒径に微粉砕した後、酸化処理
して、酸化鉄中のＦｅ２Ｏ３量を９８．０％以上に変化
させ、さらに、Ｓｒ酸化物または炭酸塩を配合混合、焼
成、粉砕、磁場中成型、焼結して高性能ＳｒフェライＨ
ａ石を得る製造方法に関する。Detailed Description of the Invention Field of Application The present invention relates to a method for producing high-performance Sr ferrite magnets using iron oxide obtained from iron ore or mill scale. After that, oxidation treatment is performed to change the amount of Fe2O3 in iron oxide to 98.0% or more, and further, Sr oxide or carbonate is mixed, fired, crushed, molded in a magnetic field, and sintered to achieve high performance. Sr Ferrai H
This invention relates to a manufacturing method for obtaining a-stone.
従来技術
一般に、Ｓｒフェラ伺・磁石（ＳｒＯ−ｎＦｅ２０３ｎ
＝５．０〜６．２）は、鉄鉱石またはミルスケールから
得られた酸化鉄とＳｒ酸化物または炭酸塩を混合、焼成
、粉砕、成形、焼結の製造工程からなる。Conventional technology Generally, Sr magnets (SrO-nFe203n
= 5.0 to 6.2) consists of the manufacturing process of mixing iron oxide obtained from iron ore or mill scale with Sr oxide or carbonate, firing, crushing, molding, and sintering.
その焼成工程は、酸化鉄とＳｒ炭酸塩または酸化物を反
応させて、フェライト化するのであるが、鉄鉱石の磁鉄
鉱、赤鉄鉱、またミルスケールは第１表に示す如き組成
からなる。In the firing process, iron oxide and Sr carbonate or oxide are reacted to form ferrite, and iron ore magnetite, hematite, and mill scale have compositions as shown in Table 1.
以下余白
従来技術の問題点
前記鉄鉱石またはミルスケールは共に、Ｆｅ２Ｏ３のほ
かにＦｅｄ、 Ｆｅ３Ｏ４を多量に含有するために、Ｓ
ｒ炭酸塩または酸化物を配合、混合前に、酸化鉄源の鉄
鉱石またはミルスケールを完全にＦｅ２Ｏ３化するため
に、０２含有雰囲気中または大気中で酸化処理する必要
がある。Margins below Problems with the Prior Art Both iron ore and mill scale contain large amounts of Fed and Fe3O4 in addition to Fe2O3.
Before blending and mixing the r carbonate or oxide, it is necessary to oxidize the iron ore or mill scale, which is the iron oxide source, in an 02-containing atmosphere or in the air in order to completely convert it into Fe2O3.
しかしながら、酸化処理した鉄鉱石またはミルスケール
は、その平均粒径により、後続の粉砕工程において、粉
砕に多大の時間を要し、製造コストの上昇並びに生産性
に問題があった。However, due to the average particle size of oxidized iron ore or mill scale, it takes a long time to grind in the subsequent grinding process, resulting in increased manufacturing costs and problems in productivity.
そこで発明者は、酸化処理後の鉄鉱石またはミルスケー
ルの断面性状を調査した結果、表面より内部に向って、
深さＳｐｍ以内はＦｅ２Ｏ３相で、内部はＦｅＯ・Ｆｅ
３Ｏ４の混合相であり、そのために酸化処理後の粉砕に
多大の時間を要すると共に、後工程の焼成工程において
、酸化鉄とＳｒ炭酸塩または、酸化物の反応においても
完全なるフェライト化が進行しないことが判明した。Therefore, the inventor investigated the cross-sectional properties of iron ore or mill scale after oxidation treatment, and found that from the surface to the inside,
Within the depth Spm is Fe2O3 phase, inside is FeO・Fe
It is a mixed phase of 3O4, so it takes a lot of time to grind after oxidation treatment, and complete ferrite formation does not proceed even in the reaction of iron oxide and Sr carbonate or oxide in the subsequent firing process. It has been found.
３−
そのため最近、要望されている高性能の自動車用モータ
ーに用いられるフェライト磁石においても、ぜいぜい
Ｂｒ ＝ ４．（１−４，２（ｋＧ）、Ｈｃ＝３．３−
３．７（ｋＯｅ）、（ＢＨ）ｍａｘ ＝３．８−３．９
（ＭＧＯｅ）、１Ｈｅ＝３．６−３．９（ｋｏｅ）、の
特性しか得られず、さらに磁石特性の向」−が要望され
てきた。3- Therefore, even in the ferrite magnets used in high-performance automobile motors, which are currently in demand, Br = 4. (1-4,2(kG), Hc=3.3-
3.7 (kOe), (BH)max = 3.8-3.9
(MGOe), 1He = 3.6-3.9 (koe), and there has been a demand for even better magnetic properties.
発明の目的
この発明は、前述の問題点を解消し、高性能が要望され
る自動車モーター用磁石の用途において、従来の磁石特
性を大幅に上回る高性能Ｓｒフェライト磁石が得られる
製造方法の提案を目的としている。Purpose of the Invention The present invention solves the above-mentioned problems and proposes a manufacturing method that can obtain a high-performance Sr ferrite magnet that greatly exceeds conventional magnet properties for use in automobile motor magnets where high performance is required. The purpose is
発明の概要
この発明は、
鉄鉱石あるいはミルスケールを選鉱または浮選後、平均
粒径１２ｐｍ以下の微粉末に粉砕し、その後、０２含有
雰囲気中または大気中で６００℃〜９００℃にて酸化処
理して、酸化鉄中に含まれるＦｅ２Ｏ３量を９８．０％
以十、に変化させ、前記酸化鉄をＳｒ炭酸塩または酸化
物と共に混合焼成後、粉砕、磁場中成型、焼結を行って
、Ｂｒ＝４．０〜４．２（ｋＧ）、Ｈｃ＝３．７−３．
９（ｋｏｅ）、（ＢＨ）ｍａｘ＝３．８−４．２（ＭＧ
Ｏｅ）、１Ｈｅ＝４．０−４．２（ｋＯｅ）の磁石特性
を有する高性能Ｓｒフェライ）・磁石を刊ることを特徴
とする製造方法である。Summary of the Invention This invention involves grinding iron ore or mill scale into fine powder with an average particle size of 12 pm or less after beneficiation or flotation, and then oxidizing the iron ore or mill scale at 600°C to 900°C in an atmosphere containing 02 or in the air. The amount of Fe2O3 contained in iron oxide was reduced to 98.0%.
After mixing and firing the iron oxide with Sr carbonate or oxide, pulverization, molding in a magnetic field, and sintering were performed to obtain Br=4.0 to 4.2 (kG) and Hc=3. .7-3.
9(koe), (BH)max=3.8-4.2(MG
This manufacturing method is characterized by producing a high-performance Sr ferrite magnet having magnetic properties of 1He=4.0-4.2 (kOe).
発明の構成
この発明において、酸化処理前の鉄鉱石あるいはミルス
ケールの粉砕粒径を１２１１ｍ以下に限定した理由は、
平均粒径が１２ｐｍを超えると、酸化処理後、粒子内部
にＦｅ０−Ｆｅ３Ｏ４が残存して、酸化処理後の粉砕に
長時間を要すると共に、焼成後に完４゛なるフェライト
化が起こらない恐れがあるためである。Structure of the Invention In this invention, the reason why the crushed particle size of iron ore or mill scale before oxidation treatment is limited to 1211 m or less is as follows.
If the average particle size exceeds 12 pm, Fe0-Fe3O4 will remain inside the particles after oxidation treatment, and it will take a long time to grind after oxidation treatment, and there is a risk that complete ferrite formation will not occur after firing. It's for a reason.
また、酸化処理の温度が６００℃未満では、鉄鉱石また
はミルスケール中に含まれるＦｅ３Ｏ４、ＦｅＯのＦｅ
２Ｏ３への反応が不十分であり、また、９００°Ｃを超
えると、一部が溶融する恐れがあり、粒子成長があるた
め後工程での粉砕効率に悪影響があり、好ましくなく、
さらに、エネルギー的にも無駄であり、好ましくない。In addition, if the oxidation treatment temperature is less than 600°C, Fe3O4 and FeO contained in iron ore or mill scale
The reaction to 2O3 is insufficient, and if the temperature exceeds 900°C, there is a risk that part of it will melt, which will cause particle growth, which will have a negative impact on the pulverization efficiency in the subsequent process, which is undesirable.
Furthermore, it is wasteful in terms of energy and is not desirable.
また、酸化処理時間は、０．１時間〜１．５時間が好ま
しく、０．１時間未満では、酸化反応が不完全であり、
また、１．５時間を越えると、焼結反応により、粒子が
成長するので好ましくない。Further, the oxidation treatment time is preferably 0.1 hour to 1.5 hours, and if it is less than 0.1 hour, the oxidation reaction is incomplete.
Moreover, if it exceeds 1.5 hours, particles will grow due to the sintering reaction, which is not preferable.
この発明において、酸イヒ処理後の酸化鉄がＦｅ２Ｏ３
を９８．０％以上含有することが、前述の高性能特性を
得るために不可欠であり、前述の酸化処理前の粉砕粒径
、酸化処理温度、酸化処理時間が重要である。In this invention, iron oxide after acid immersion treatment is Fe2O3
It is essential to contain 98.0% or more of oxidation treatment in order to obtain the above-mentioned high-performance characteristics, and the pulverized particle size, oxidation treatment temperature, and oxidation treatment time are important before the oxidation treatment.
この発明において、磁場中成型条件としては、成型は垂
直磁場中成型、平行磁場中型でもよいが、量産性及び製
品寸法の制約上、平行磁場中成型が好ましく、磁力は７
〜１５ｋＯｅ、成型圧は０．３−０．６ｋｇ／ｃｍ２が
好ましい。In this invention, as for the molding conditions in a magnetic field, molding may be performed in a perpendicular magnetic field or in a parallel magnetic field, but molding in a parallel magnetic field is preferable due to constraints on mass productivity and product dimensions, and the magnetic force is 7.
~15 kOe, and the molding pressure is preferably 0.3-0.6 kg/cm2.
また、焼結条件は、酸化性雰囲気中で
１２００℃〜１２７０℃に、０．５時間〜１．５時間の
条件が好ましい。The sintering conditions are preferably 1200° C. to 1270° C. for 0.5 hours to 1.5 hours in an oxidizing atmosphere.
この発明によるＳｒフェライト磁石は、焼結性また磁石
特性改善のために、添加物として、５ｉ０２、Ｃｒ２Ｏ
３、Ｃａｂ、 Ａｌ２Ｏ３、Ｃｏｏ、 ＮｉＯの少なく
とも１種を２％以下含有してもよい。The Sr ferrite magnet according to the present invention contains 5i02, Cr2O as additives to improve sinterability and magnetic properties.
3. At least one of Cab, Al2O3, Coo, and NiO may be contained in an amount of 2% or less.
また、鉄鉱石またはミルスケール中にＴｉＯ２、ＭｇＯ
，５ｉ０２等の不純物を含む場合は、磁選、浮選等の工
程を入れる必要がある。Also, TiO2, MgO in iron ore or mill scale
, 5i02, etc., it is necessary to perform steps such as magnetic separation and flotation.
実施例 この発明を実施例により説明する。Example This invention will be explained by examples.
実施例１
鉄鉱石として、第２表に組成を表す磁鉄鉱（スウェーデ
ン鉄鉱石、粒状品）を平均粒径５ｐｍに粉砕後、回転炉
にて大気中で８００℃、１時間の酸化処理を行った。Example 1 As iron ore, magnetite (Swedish iron ore, granular product) whose composition is shown in Table 2 was crushed to an average particle size of 5 pm, and then oxidized in a rotary furnace at 800°C in the atmosphere for 1 hour. .
なお、酸化処理後の酸化鉄ｌ：１吋こ含まれるＦｅ２Ｏ
３量は９９．５％であった。In addition, iron oxide after oxidation treatment contains 1 inch of Fe2O.
3 amount was 99.5%.
さらに、平均粒径１．３ｐｍに微粉砕し、その後、Ｆｅ
２Ｏ３／ ＳｒＯのモル比６．０の基本組成を有するフ
ェライト磁石になる如＜ ＳｒＣＯ３を配合、混合、造
粒後、１３００℃で１時間の焼成後、粗粉砕し、添加物
７
として、５ｉ０２０．５％、Ａｌ２Ｏ３０，１５％、Ｃ
０００，３％、ＣａＯ０，５％を添加混合し、微粉砕し
て、平均粒径０．８５ｐｍにした。Furthermore, the Fe
A ferrite magnet having a basic composition with a molar ratio of 2O3/SrO of 6.0 is obtained. After blending, mixing and granulating SrCO3, it is fired at 1300°C for 1 hour, and then coarsely pulverized, and 5i020. 5%, Al2O30,15%, C
0.000.3% and CaO 0.5% were added and mixed and pulverized to an average particle size of 0.85 pm.
その後、８ｋＯｅの磁場中で成型圧０．５Ｔ／ｃｍ”に
て平行磁場中成型し、さらに大気中で１２５０℃、１時
間の条件で焼結して、Ｓｒフェライト磁石を得た。Thereafter, it was molded in a parallel magnetic field at a molding pressure of 0.5 T/cm'' in a magnetic field of 8 kOe, and further sintered in the atmosphere at 1250° C. for 1 hour to obtain an Sr ferrite magnet.
得られたＳｒフェライトの磁石特性を第４表に表す。Table 4 shows the magnetic properties of the obtained Sr ferrite.
実施例２
第３表に組成を表したミルスケールを平均粒径６ｐｍに
機械粉砕した後、回転炉にて、大気中にて８００℃、１
時間の酸化処理し、平均粒径２ｐｍに粉砕した。そのと
きの酸化鉄のＦｅ２Ｏ３量は９９．２％であった。Example 2 Mill scale whose composition is shown in Table 3 was mechanically pulverized to an average particle size of 6 pm, and then pulverized in a rotary furnace at 800°C in the atmosphere for 1 hour.
It was oxidized for several hours and ground to an average particle size of 2 pm. The amount of Fe2O3 in the iron oxide at that time was 99.2%.
その後、前記酸化鉄にＳｒＣＯ３を配合、混合、造粒後
、大気雰囲気中で１３００″Ｃに１時間焼成し、さらに
粉砕して平均粒径４ｐｍにした。Thereafter, SrCO3 was added to the iron oxide, mixed, granulated, fired at 1300''C for 1 hour in the air, and further pulverized to an average particle size of 4 pm.
続いて、添加物として５ｉ０２０．５％、Ａｌ２０３０
．１５％、Ｃｏｏ Ｏ，３％、ＣａＯ０，５％を添加混
合後、平均粒径０．７５ｐｍに微粉砕し、さらに、７．
５ｋＯｅの磁場中にて成型圧０．４８Ｔ／ｃｍ２にて平
行磁場中成型し、その後、大気中にて１２５０℃に１時
間の焼結を行って、Ｓｒフェライト磁石を得た。Subsequently, 5i020.5% and Al2030 were added as additives.
．． After adding and mixing 15% CooO, 3% CooO, and 0.5% CaO, the mixture was finely ground to an average particle size of 0.75pm, and further 7.
It was molded in a parallel magnetic field at a molding pressure of 0.48 T/cm 2 in a magnetic field of 5 kOe, and then sintered at 1250° C. for 1 hour in the air to obtain an Sr ferrite magnet.
得られたＳｒフェライト磁石の磁石特性を第４表に表す
。Table 4 shows the magnetic properties of the obtained Sr ferrite magnet.
比較例１
実施例２と同一のミルスケールを用いて、平均粒径１５
ｐｍに機械粉砕した後、実施例２と同一の酸化鉄及びフ
ェライト製造条件にてＳｒフェライト磁石を製造した。Comparative Example 1 Using the same mill scale as in Example 2, the average particle size was 15
After mechanically pulverizing to pm, an Sr ferrite magnet was manufactured under the same iron oxide and ferrite manufacturing conditions as in Example 2.
得られたＳｒフェライト磁石の磁石特性を第４表に表す
。なお、酸化処理後の酸化鉄中に含まれるＦｅ２Ｏ３量
は５９％であった。Table 4 shows the magnetic properties of the obtained Sr ferrite magnet. Note that the amount of Fe2O3 contained in the iron oxide after the oxidation treatment was 59%.
比較例２
実施例２と同一のミルスケールを用いて、未処理のまま
ミルスケールより得られた酸化鉄とＳｒ炭酸塩を、実施
例２と同一条件にて混合、造粒、焼成、粉砕、磁場中成
型、焼結して得られたＳｒフェライト磁石の磁石特性を
第４表に表す。なお、酸化鉄中に含まれるＦｅ２Ｏ３量
は３０％であった。Comparative Example 2 Using the same mill scale as in Example 2, iron oxide and Sr carbonate obtained from the untreated mill scale were mixed, granulated, fired, crushed, and mixed under the same conditions as in Example 2. Table 4 shows the magnetic properties of the Sr ferrite magnet obtained by molding and sintering in a magnetic field. Note that the amount of Fe2O3 contained in iron oxide was 30%.
第４表
発明の効果
この発明は、酸化鉄を所要粒径に微粉砕した後、酸化処
理して、酸化鉄中のＦｅ２Ｏ３量を９８．０％以上に変
化させ、さらにＳｒ酸化物または炭酸塩を配合混合、焼
成、粉砕、磁場中成型、焼結することにより、第４表の
実施例１、実施例２に示す如く、自動車モーター用磁石
に最適である、
Ｂｒ＝４．０〜４．２（ｋＧ）、Ｈｃ＝３．７〜３．９
（ｋＯｅ）、（ＢＨ）ｍａｘ ＝ ３．８−４．２（Ｍ
ＧＯｅ）、１Ｈｅ＝４．０−４．２（ｋＯｅ）の磁石特
性を有する高性能Ｓｒフェライト磁石を得ることができ
る。Table 4 Effects of the Invention This invention involves finely pulverizing iron oxide to a required particle size, then oxidizing it to change the amount of Fe2O3 in the iron oxide to 98.0% or more, and further adding Sr oxide or carbonate. By blending, firing, pulverizing, molding in a magnetic field, and sintering, as shown in Examples 1 and 2 in Table 4, Br = 4.0 to 4.0 is optimal for automobile motor magnets. 2 (kG), Hc=3.7-3.9
(kOe), (BH)max = 3.8-4.2(M
A high performance Sr ferrite magnet having magnetic properties of 1He=4.0-4.2 (kOe) can be obtained.
Claims (1)
砕後、Ｏ＿２含有雰囲気または大気中で ６００℃〜９００℃に酸化処理して、酸化鉄中のＦｅ＿
２Ｏ＿３量を９８．０％以上に変化させた後、前記酸化
鉄をＳｒ酸化物または炭酸塩と共に混合焼成後、粉砕、
磁場中成型、焼結することを特徴とする高性能Ｓｒフェ
ライト磁石の製造方法。[Claims] After pulverizing iron ore or mill scale to an average particle size of 12 μm or less, it is oxidized at 600°C to 900°C in an O_2-containing atmosphere or air to reduce Fe_ in iron oxide.
After changing the amount of 2O_3 to 98.0% or more, the iron oxide is mixed and fired with Sr oxide or carbonate, and then pulverized.
A method for producing a high-performance Sr ferrite magnet, which is characterized by forming and sintering in a magnetic field.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2040346A JPH03123004A (en) | 1989-03-31 | 1990-02-21 | Manufacture of highly efficient sr ferrite magnet |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1-81789 | 1989-03-31 | ||
| JP8178989 | 1989-03-31 | ||
| JP2040346A JPH03123004A (en) | 1989-03-31 | 1990-02-21 | Manufacture of highly efficient sr ferrite magnet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03123004A true JPH03123004A (en) | 1991-05-24 |
Family
ID=26379802
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2040346A Pending JPH03123004A (en) | 1989-03-31 | 1990-02-21 | Manufacture of highly efficient sr ferrite magnet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03123004A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1047253C (en) * | 1993-09-28 | 1999-12-08 | 住友特殊金属株式会社 | Process of producing calcined materials for ferrite magnet |
| JP2002029855A (en) * | 2000-07-11 | 2002-01-29 | Nippon Synthetic Chem Ind Co Ltd:The | Binder for inorganic powder |
| KR100440678B1 (en) * | 2001-12-21 | 2004-07-21 | 재단법인 포항산업과학연구원 | Fabrication method of hard ferrite using mill scale added oxidant |
| WO2015114570A1 (en) * | 2014-01-31 | 2015-08-06 | Saudi Basic Industries Corporation | Hard magnetic compositions from iron oxide fines and methods for making same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55157215A (en) * | 1979-05-28 | 1980-12-06 | Hitachi Metals Ltd | Manufacture of ferrite magnet |
| JPS58202504A (en) * | 1982-05-21 | 1983-11-25 | Hitachi Metals Ltd | Manufacture of iron oxide for oxide permanent magnet |
-
1990
- 1990-02-21 JP JP2040346A patent/JPH03123004A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55157215A (en) * | 1979-05-28 | 1980-12-06 | Hitachi Metals Ltd | Manufacture of ferrite magnet |
| JPS58202504A (en) * | 1982-05-21 | 1983-11-25 | Hitachi Metals Ltd | Manufacture of iron oxide for oxide permanent magnet |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1047253C (en) * | 1993-09-28 | 1999-12-08 | 住友特殊金属株式会社 | Process of producing calcined materials for ferrite magnet |
| JP2002029855A (en) * | 2000-07-11 | 2002-01-29 | Nippon Synthetic Chem Ind Co Ltd:The | Binder for inorganic powder |
| JP4554775B2 (en) * | 2000-07-11 | 2010-09-29 | 日本合成化学工業株式会社 | Ferrite magnet manufacturing method |
| KR100440678B1 (en) * | 2001-12-21 | 2004-07-21 | 재단법인 포항산업과학연구원 | Fabrication method of hard ferrite using mill scale added oxidant |
| WO2015114570A1 (en) * | 2014-01-31 | 2015-08-06 | Saudi Basic Industries Corporation | Hard magnetic compositions from iron oxide fines and methods for making same |
| CN105960385A (en) * | 2014-01-31 | 2016-09-21 | 沙特基础工业公司 | Hard magnetic compositions from iron oxide fines and methods for making same |
| US10614939B2 (en) | 2014-01-31 | 2020-04-07 | Saudi Basic Industries Corporation | Hard magnetic compositions from iron oxide fines and methods for making same |
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