JPS58159308A - Manfaucture of metallic magnetic powder - Google Patents
Manfaucture of metallic magnetic powderInfo
- Publication number
- JPS58159308A JPS58159308A JP57042375A JP4237582A JPS58159308A JP S58159308 A JPS58159308 A JP S58159308A JP 57042375 A JP57042375 A JP 57042375A JP 4237582 A JP4237582 A JP 4237582A JP S58159308 A JPS58159308 A JP S58159308A
- Authority
- JP
- Japan
- Prior art keywords
- iron
- magnetic powder
- metallic
- principal ingredient
- polyhydric alcohol
- 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.)
- Granted
Links
- 239000006247 magnetic powder Substances 0.000 title claims abstract description 23
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 43
- 229910052751 metal Inorganic materials 0.000 claims abstract description 31
- 239000002184 metal Substances 0.000 claims abstract description 31
- 229910052742 iron Inorganic materials 0.000 claims abstract description 16
- 239000010949 copper Substances 0.000 claims abstract description 12
- 239000002245 particle Substances 0.000 claims abstract description 12
- 150000005846 sugar alcohols Polymers 0.000 claims abstract description 12
- 239000011701 zinc Substances 0.000 claims abstract description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052802 copper Inorganic materials 0.000 claims abstract description 11
- 150000003839 salts Chemical class 0.000 claims abstract description 11
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 11
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 239000000843 powder Substances 0.000 claims abstract 2
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 230000003647 oxidation Effects 0.000 abstract description 7
- 238000007254 oxidation reaction Methods 0.000 abstract description 7
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 6
- 150000002739 metals Chemical class 0.000 abstract description 5
- 238000009835 boiling Methods 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 abstract description 2
- 239000004615 ingredient Substances 0.000 abstract 6
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 abstract 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 abstract 1
- 150000004820 halides Chemical class 0.000 abstract 1
- 229910017053 inorganic salt Inorganic materials 0.000 abstract 1
- 239000000126 substance Substances 0.000 abstract 1
- 230000005415 magnetization Effects 0.000 description 9
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 239000002202 Polyethylene glycol Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229920001223 polyethylene glycol Polymers 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 description 2
- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- -1 aluminum halide Chemical class 0.000 description 1
- 210000003323 beak Anatomy 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- ORTQZVOHEJQUHG-UHFFFAOYSA-L copper(II) chloride Chemical compound Cl[Cu]Cl ORTQZVOHEJQUHG-UHFFFAOYSA-L 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 159000000011 group IA salts Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 150000003751 zinc Chemical class 0.000 description 1
- 235000005074 zinc chloride Nutrition 0.000 description 1
- 239000011592 zinc chloride Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/06—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder
- H01F1/061—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder with a protective layer
Abstract
Description
【発明の詳細な説明】
この発明は鉄を主体とする金属磁性粉末の製造方法に関
し、その目的とするところは一酸化安定性に優れる前記
の金属磁性粉末の製造方法を提供することｋある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing metal magnetic powder containing iron as a main component, and an object thereof is to provide a method for producing the above-mentioned metal magnetic powder that has excellent monoxide stability.
鉄を主体とする金属磁性粉末は従来の酸化物系磁性粉末
に比較して優れた磁気特性を有してψるが、反面空気中
で非常に酸化を受は易く、飽和磁化量が経時的に低下し
、貯蔵安定性に欠けるという問題がある。Metallic magnetic powders mainly composed of iron have superior magnetic properties compared to conventional oxide-based magnetic powders, but on the other hand, they are extremely susceptible to oxidation in the air, and the amount of saturation magnetization decreases over time. There is a problem that the storage stability is poor.
このため、この種の金属磁性粉末を有機溶剤中あるいは
窒素雰囲気中で微量の溶存酸素あるいは低？ａ廖の酸素
含有ガスなどにより酸化して粒子表面に酸化物被膜を形
成した９、あるいはこの被膜トにさらに酸化ケイ素等か
らなる酸化物被膜を形成するなどの方法で酸化安定性の
改善が図られているが、このようにして形成された酸化
物被膜は未だ充分に安定したものでなくまたそれほど緻
密なものでもないため未だ充分に満足できる結果は得ら
れていない。For this reason, this type of metal magnetic powder can be used in organic solvents or nitrogen atmospheres with trace amounts of dissolved oxygen or low concentrations of dissolved oxygen. Oxidation stability can be improved by methods such as forming an oxide film on the particle surface by oxidizing it with an oxygen-containing gas, etc., or forming an oxide film made of silicon oxide etc. on top of this film. However, the oxide film formed in this way is not yet sufficiently stable and not very dense, so that fully satisfactory results have not yet been obtained.
この発明者らはかかる現状に鑑み種々検討を行なった結
果、既に酸化物被膜を形成した鉄を主体とする金属磁性
粉末を、銅、亜鉛、アルｓ ニウムから選ばれる少なく
とも一種を含む金属塩を含む多価アルコール中に分散し
、次いでこれを加熱すると既に前記磁性粉末の粒子表面
に形成された酸化物被膜中に銅、亜鉛、アルミニウムか
ら選けれる少なくとも一櫨の金属が含有されて酸化物被
膜が安定化すると同時に緻密化され、その結果酸化安定
性が充分に向上されることを見いだし、この発明をなす
に至った。The inventors conducted various studies in view of the current situation, and as a result, they found that a metal magnetic powder mainly composed of iron, which has already formed an oxide film, can be mixed with a metal salt containing at least one selected from copper, zinc, and arsenium. When dispersed in a polyhydric alcohol containing polyhydric alcohol and then heated, at least one metal selected from copper, zinc, and aluminum is contained in the oxide film already formed on the surface of the particles of the magnetic powder. It was discovered that the coating was stabilized and densified at the same time, and as a result, the oxidation stability was sufficiently improved, leading to the present invention.
この発明において使用する多価アルコールとしては、沸
点が１５０°Ｃ以上の、たとえばエチレングリコール、
ポリエチレングリコール、プロピレングリコール、グリ
セリンなどが好適なものとして使用され、これら高沸点
の多価アルコール中に銅塩または亜鉛塩もしくはアル４
ニウム塩等を溶解してできたアルコラード溶液中に、既
に酸化物被膜を形成した鉄を主体とする金属磁性粉末を
分散しに後、１５０°Ｃ以上の温度で加熱すると、多に
銅、亜鉛、アルミニウムなどの金属が良好に導入拡散さ
れ、これらの金属を含有した安定で緻密な酸化物被膜が
形成されて酸化安定性が向上する。The polyhydric alcohol used in this invention has a boiling point of 150°C or higher, such as ethylene glycol,
Polyethylene glycol, propylene glycol, glycerin, etc. are preferably used, and copper or zinc salts or alkaline salts are added to these high-boiling polyhydric alcohols.
After dispersing metal magnetic powder mainly composed of iron, which has already formed an oxide film, into an Alcolade solution made by dissolving a metal salt, etc., and heating it at a temperature of 150°C or higher, copper and zinc are dissolved. , aluminum, and other metals are introduced and diffused well, and a stable and dense oxide film containing these metals is formed, improving oxidation stability.
このような酸化物被膜中への金属の導入拡散は、１５０
℃以下の加熱処理ではおこりにくく、高温になるほど促
進されて酸化安定性が向上するが、３００℃の温度にな
ると被膜中への金属の拡散が充分に行なわれるため３０
０℃以上の温度で加熱する必要はない。The introduction and diffusion of metal into such an oxide film is 150
This does not occur easily with heat treatment at temperatures below 30°C, and the higher the temperature, the faster the oxidation stability improves, but at a temperature of 300°C, metal diffusion into the film is sufficient,
There is no need to heat at temperatures above 0°C.
多価アルコール中に溶解する金属塩としては、銅または
亜鉛もしくはアルミニウムのへロゲン化物、水酸化物、
炭酸塩、硫酸塩などの無機塩の他、これらの金属の有機
金属塩等が好適なものとして使用され、これらの金属塩
が多価アルコール中に溶解されると多価アルコールと反
応して金属アルコラードが生成される。Metal salts that dissolve in polyhydric alcohols include copper, zinc, or aluminum halide, hydroxide,
In addition to inorganic salts such as carbonates and sulfates, organic metal salts of these metals are preferably used. When these metal salts are dissolved in polyhydric alcohol, they react with the polyhydric alcohol to form metals. Alcorado is generated.
粒子表面に酸化物被膜を形成する前の鉄を主体とする金
属磁性粉末としては、金属鉄粉末の他、鉄ＫＣｏｓ Ｎ
ｉ、ＡＩ、Ｃｒｓ Ｍｎ％Ｓｉｓ Ｚｎなどを含有させ
た金属磁性粉末が広く包含され、液中還元法、気相還元
法、電解法のいかんを問わずあらゆる方法で製造された
従来の鉄を主体とする金属磁性粉末がいずれも用いられ
る。In addition to metallic iron powder, iron KCos N
It includes a wide range of metal magnetic powders containing i, AI, Crs Mn%Sis Zn, etc., and mainly uses conventional iron produced by any method, whether it is in-liquid reduction, gas phase reduction, or electrolysis. Both metal magnetic powders are used.
次に、この発明の実施例について説明する。Next, embodiments of the invention will be described.
実施例１
粒径０．３μ、軸比（長軸／短軸）１０／１、飽和磁化
量σｓ１６５ｅｍｕ／ｇ、保磁力１４５０エルステツド
の金属鉄粉末１Ｋｇトルエン約１０ｊ中に分散させ、流
連５１／分の空気を分散液中にバブリングさせながら５
時間攪拌処理して酸化鉄か、らなる酸化物被膜で覆われ
た粒径０．３μ、軸比（長軸／短軸）１０／１、飽和磁
化蓋σｓ１３０ｅｍｕ／り、保磁力１４７０エルステツ
ドの金属鉄粉末を得た。Example 1 1 kg of metallic iron powder with a particle size of 0.3 μ, an axial ratio (major axis/minor axis) of 10/1, a saturation magnetization amount σs of 165 emu/g, and a coercive force of 1450 oersted was dispersed in about 10 j of toluene, and the flow rate was 51/min. 5 while bubbling air into the dispersion.
A metal coated with an oxide film made of iron oxide after time-stirring treatment, with a particle diameter of 0.3μ, an axial ratio (major axis/minor axis) of 10/1, a saturation magnetization cap of σs of 130 emu/l, and a coercive force of 1470 oersted. Obtained iron powder.
次いでこの酸化物被膜で覆われた金属磁性粉末１００重
量部をポリエチレングリコール（平均分子量６００ ）
２００重量部に塩化銅（ＣｕＣ１２゜２Ｈ２０）８重蓋
部を溶かしてできたアルコラード溶液中に分散させ、常
圧下２５０℃で４時間反応、させた。これを水洗、乾燥
し、銅を含有する酸化物からなる被膜に着われた金属鉄
粉末を得た。得られた金属鉄粉末は粒径が０．３μ、軸
比（長軸／短軸）が１０／１、飽和磁化量σＳが１２９
ｅｍｕ／９で、保磁力は１４６０エルステツドであっ
た。Next, 100 parts by weight of the metal magnetic powder covered with this oxide film was mixed with polyethylene glycol (average molecular weight 600).
The mixture was dispersed in an Alcolade solution prepared by dissolving 8 parts of copper chloride (CuC12°2H20) in 200 parts by weight, and reacted at 250°C under normal pressure for 4 hours. This was washed with water and dried to obtain metallic iron powder adhering to a coating made of a copper-containing oxide. The obtained metallic iron powder has a particle size of 0.3μ, an axial ratio (major axis/minor axis) of 10/1, and a saturation magnetization amount σS of 129.
At emu/9, the coercive force was 1460 oersted.
実施例２
実施例１において塩化銅に代えて塩化亜鉛（ＺｎＣ１２
）を同量使用した以外は実施例１と同様にして亜鉛を含
有する酸化物からなる被膜で覆われた粒径０．３μ、軸
比（長軸／短軸）１０／１、飽和磁化蓋σｓ １３０
ｅｍｕ／り、保磁力１３９０エルステツドの金属鉄粉末
を得た。Example 2 In Example 1, zinc chloride (ZnC12
) was used in the same manner as in Example 1, except that the particles were coated with a film made of an oxide containing zinc, had a grain size of 0.3μ, an axial ratio (major axis/minor axis) of 10/1, and a saturated magnetization lid. σs 130
A metallic iron powder with a coercive force of 1390 Oersted was obtained.
実施例３
実施例１において塩化鋼に代えて硫酸アルミニウム（Ａ
１２ （５Ｏ４）ｓ ’ １６ Ｈ２Ｏ）を同量使用
した以外は実施例１と同様にしてアルミニウムを含有す
る酸化物被膜で覆われた粒径０．３μ、軸比（長軸／短
軸）１０／１、飽和磁化量σｓ １２８ ｅｍｕ／Ｇ’
％保磁力１４１０エルステッドの金属鉄粉末を得た。Example 3 In Example 1, aluminum sulfate (A
12 (5O4)s' 16 H2O) was used in the same manner as in Example 1, and the grain size was 0.3μ and the axial ratio (major axis/minor axis) was 10. /1, saturation magnetization amount σs 128 emu/G'
A metallic iron powder with a coercive force of 1410 oersteds was obtained.
各実施例で得られた金属鉄粉末および各実施例中の金属
鉄粉末の各金属（Ｃｕ ％ Ｚｎ ％ ＡＩ ）の添加
ｌｉｊの酸化物被膜を形成し之金属鉄粉末（比較例１．
２．３）をそれぞれ６０℃、９０嘴Ｒ）Ｉの条件下で２
４時間空気中に放置し、放置後の飽和磁化量を測定して
放置前の飽和磁化量からの低下率を調べた。The addition of each metal (Cu%Zn%AI) to the metallic iron powder obtained in each example and the metallic iron powder in each example formed an oxide film of the metallic iron powder (Comparative Example 1.
2.3) under the conditions of 60°C and 90 beak R)I, respectively.
The sample was left in the air for 4 hours, the saturation magnetization after being left was measured, and the rate of decrease from the saturation magnetization before being left was examined.
ｔ゛表はその結果である。The t゛ table is the result.
上表から明らかなように、この発明で得られた金属鉄粉
末（実施例１〜３１いずれも従来の酸化物被膜を有する
金属鉄粉末（比較例１〜３）に比し、飽和磁化量σＳの
低下率が小さく、このことからこの発明の製造方法によ
れば、酸化安定性に優れた鉄を主体とする金属磁性粉末
が得られることがわかる。As is clear from the above table, the saturation magnetization σ The rate of decrease in is small, which indicates that according to the production method of the present invention, a metal magnetic powder mainly composed of iron with excellent oxidation stability can be obtained.
特許出願人 日立マクセル株式会社代理人 高岡−
春へ賦ね；篇
３５−Patent applicant Hitachi Maxell Co., Ltd. Agent Takaoka
Give it to spring; Volume 35-
Claims (1)
する金属磁性粉末を、銅、亜鉛、アルミニウムから選ば
れる少なくとも一種を含む金属塩を溶解した多価アルコ
ール中に分散し、これを加熱して鉄を主体とする金属磁
性粉末の粒子表面に、銅、亜鉛、アルミニウムから迩ば
れる少なくとも一種の金属を含有した酸化物被膜を形成
することを特徴とする金属磁性粉末の製造方法1. A metal magnetic powder mainly composed of iron with an oxide film formed on the surface of the powder particles is dispersed in a polyhydric alcohol in which a metal salt containing at least one selected from copper, zinc, and aluminum is dissolved. A method for producing metal magnetic powder, which comprises heating to form an oxide film containing at least one metal selected from copper, zinc, and aluminum on the surface of particles of metal magnetic powder mainly composed of iron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57042375A JPS58159308A (en) | 1982-03-17 | 1982-03-17 | Manfaucture of metallic magnetic powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57042375A JPS58159308A (en) | 1982-03-17 | 1982-03-17 | Manfaucture of metallic magnetic powder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58159308A true JPS58159308A (en) | 1983-09-21 |
| JPH0450724B2 JPH0450724B2 (en) | 1992-08-17 |
Family
ID=12634298
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57042375A Granted JPS58159308A (en) | 1982-03-17 | 1982-03-17 | Manfaucture of metallic magnetic powder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58159308A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60171631A (en) * | 1984-02-15 | 1985-09-05 | Hitachi Maxell Ltd | Magnetic recording medium |
| WO2015098895A1 (en) * | 2013-12-26 | 2015-07-02 | 株式会社 Ｍｔｇ | Skin care agent |
| JP2019160945A (en) * | 2018-03-09 | 2019-09-19 | Tdk株式会社 | Soft magnetic metal powder, powder magnetic core and magnetic component |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5390151A (en) * | 1977-01-21 | 1978-08-08 | Hitachi Maxell | Magnetic powder manufacturing process |
| JPS5521146A (en) * | 1978-08-01 | 1980-02-15 | Tdk Corp | Manufacturing method of magnetic powder |
| JPS58120704A (en) * | 1982-01-14 | 1983-07-18 | Dainippon Ink & Chem Inc | Production of ferromagnetic metallic powder |
-
1982
- 1982-03-17 JP JP57042375A patent/JPS58159308A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5390151A (en) * | 1977-01-21 | 1978-08-08 | Hitachi Maxell | Magnetic powder manufacturing process |
| JPS5521146A (en) * | 1978-08-01 | 1980-02-15 | Tdk Corp | Manufacturing method of magnetic powder |
| JPS58120704A (en) * | 1982-01-14 | 1983-07-18 | Dainippon Ink & Chem Inc | Production of ferromagnetic metallic powder |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60171631A (en) * | 1984-02-15 | 1985-09-05 | Hitachi Maxell Ltd | Magnetic recording medium |
| WO2015098895A1 (en) * | 2013-12-26 | 2015-07-02 | 株式会社 Ｍｔｇ | Skin care agent |
| JPWO2015098895A1 (en) * | 2013-12-26 | 2017-03-23 | 株式会社 Ｍｔｇ | Skin care agent |
| JP2019160945A (en) * | 2018-03-09 | 2019-09-19 | Tdk株式会社 | Soft magnetic metal powder, powder magnetic core and magnetic component |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0450724B2 (en) | 1992-08-17 |
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