JPH10125517A - Manufacture of raw material powder for permanent magnet - Google Patents
Manufacture of raw material powder for permanent magnetInfo
- Publication number
- JPH10125517A JPH10125517A JP8281930A JP28193096A JPH10125517A JP H10125517 A JPH10125517 A JP H10125517A JP 8281930 A JP8281930 A JP 8281930A JP 28193096 A JP28193096 A JP 28193096A JP H10125517 A JPH10125517 A JP H10125517A
- Authority
- JP
- Japan
- Prior art keywords
- raw material
- powder
- permanent magnet
- material powder
- gas
- 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
- 239000000843 powder Substances 0.000 title claims abstract description 23
- 239000002994 raw material Substances 0.000 title claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 29
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000007789 gas Substances 0.000 claims abstract description 14
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 229910052786 argon Inorganic materials 0.000 claims abstract description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910001873 dinitrogen Inorganic materials 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims abstract description 5
- 230000001590 oxidative effect Effects 0.000 claims abstract description 4
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 7
- 150000002910 rare earth metals Chemical group 0.000 claims description 7
- 238000010304 firing Methods 0.000 claims description 3
- 238000010298 pulverizing process Methods 0.000 claims description 2
- 230000006835 compression Effects 0.000 abstract 2
- 238000007906 compression Methods 0.000 abstract 2
- 239000000463 material Substances 0.000 abstract 2
- 239000001257 hydrogen Substances 0.000 description 7
- 229910052739 hydrogen Inorganic materials 0.000 description 7
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 6
- 229910052796 boron Inorganic materials 0.000 description 6
- 229910052779 Neodymium Inorganic materials 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 229910052598 goethite Inorganic materials 0.000 description 4
- AEIXRCIKZIZYPM-UHFFFAOYSA-M hydroxy(oxo)iron Chemical compound [O][Fe]O AEIXRCIKZIZYPM-UHFFFAOYSA-M 0.000 description 4
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 229910002588 FeOOH Inorganic materials 0.000 description 3
- 229910017052 cobalt Inorganic materials 0.000 description 3
- 239000010941 cobalt Substances 0.000 description 3
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 229910052777 Praseodymium Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000000748 compression moulding Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- PUDIUYLPXJFUGB-UHFFFAOYSA-N praseodymium atom Chemical compound [Pr] PUDIUYLPXJFUGB-UHFFFAOYSA-N 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
-
- 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
- H01F1/047—Alloys characterised by their composition
-
- 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
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
-
- 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
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/0536—Alloys characterised by their composition containing rare earth metals sintered
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
- H01F41/0293—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets diffusion of rare earth elements, e.g. Tb, Dy or Ho, into permanent magnets
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/02—Permanent magnets [PM]
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、磁気特性に優れた
永久磁石用原料粉末の製造方法に関するものである。The present invention relates to a method for producing a raw material powder for permanent magnets having excellent magnetic properties.
【０００２】[0002]
【従来の技術】永久磁石は目覚ましい進歩をしており、
特に希土類・鉄・ホウ素系永久磁石は優れた磁気特性を
有する磁石として賞用されている。特公昭６１−３４２
４２号には希土類（Ｒ）８〜３０原子％、ホウ素（Ｂ）
２〜２８原子％、鉄（Ｆｅ）６５〜８２原子％（一部を
Ｃｏ及び／又はＮｉで置換したものを含む）よりなる磁
気異方性燒結磁石が開示されている。上記以外の成分と
して、Ｃｕ，Ｃｏ，Ｓ，Ｐ，Ｃａ，Ｍｇ，Ｏ，Ｓｉ，Ａ
ｌ等工業的に製造上不可避な不純物の存在を許容できる
とし、また三元素系基本組成ＦｅＢＲに、Ａｌ，Ｔｉ，
Ｖ，Ｃｒ，Ｍｎ，Ｎｉ，Ｚｎ，Ｚｒ，Ｎｂ，Ｍｏ，Ｔ
ａ，Ｗ，Ｓｎ，Ｂｉ，Ｓｂの一種以上を添加することに
より、高保磁力化が可能であるとの知見が開示されてい
る。実施例では最大エネルギー積（ＢＨ）ｍａｘが３５
ＭＧＯｅ以上と言う優れた永久磁石を得ている。原料粉
末の製造に当っては、まず上記成分を含有する鋳造合金
を製造し、次いで鋳造合金を機械的に粉末化する必要が
あり粉砕コストがかかる。またバッチごとに性能が異な
るという問題もある。2. Description of the Related Art Permanent magnets are making remarkable progress,
In particular, rare earth / iron / boron permanent magnets have been awarded as magnets having excellent magnetic properties. Tokiko Sho 61-342
No. 42 contains 8 to 30 atomic% of rare earth (R) and boron (B)
A magnetically anisotropic sintered magnet comprising 2 to 28 at% and 65 to 82 at% of iron (Fe) (including those partially substituted with Co and / or Ni) is disclosed. As components other than the above, Cu, Co, S, P, Ca, Mg, O, Si, A
and the presence of impurities that are unavoidable in industrial production such as l.
V, Cr, Mn, Ni, Zn, Zr, Nb, Mo, T
It is disclosed that the addition of at least one of a, W, Sn, Bi, and Sb can increase the coercive force. In the embodiment, the maximum energy product (BH) max is 35.
An excellent permanent magnet of MGOe or better is obtained. In the production of the raw material powder, it is necessary to first produce a cast alloy containing the above-mentioned components, and then to mechanically pulverize the cast alloy, resulting in a high grinding cost. There is also a problem that the performance differs for each batch.
【０００３】また、ＦｅＯＯＨ（ゲータイト）針状結晶
を水素気流中で３００〜６００℃に加熱し還元して得ら
れる針状鉄粉にネオジム（Ｎｄ）のような希土類金属、
ホウ素、コバルトのような磁気特性改良成分を添加し拡
散させた永久磁石原料粉末も提案されているが、出発原
料であるＦｅＯＯＨ（ゲータイト）が縦横比が５：１乃
至１０：１前後の針状結晶であるため、得られる針状鉄
粉も縦横比が５：１以上であり、ボンド磁石用として使
用する場合の成形性に難がある。Further, a needle-like iron powder obtained by heating and reducing FeOOH (goethite) needle-like crystals at 300 to 600 ° C. in a hydrogen stream is mixed with a rare earth metal such as neodymium (Nd).
Permanent magnet raw material powders in which a magnetic property improving component such as boron or cobalt is added and diffused have also been proposed, but the starting material FeOOH (goethite) has an acicular shape having an aspect ratio of about 5: 1 to 10: 1. Since it is a crystal, the obtained acicular iron powder also has an aspect ratio of 5: 1 or more, and is difficult to form when used as a bonded magnet.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、製造が容易
で、磁気特性に優れた永久磁石用原料粉末の製造方法を
提供することを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to provide a method for producing a raw material powder for a permanent magnet which is easy to produce and has excellent magnetic properties.
【０００５】[0005]
【課題を解決するための手段】本発明に係る永久磁石用
原料粉末の製造方法は、針状鉄粉を磁場の存在下で圧縮
成形した後、圧縮成形物を非酸化性ガス雰囲気中で８０
０℃〜１０００℃で焼成し、得られた焼成物を粉砕して
磁気特性改良成分の微粉末と混合し、混合物をアルゴン
ガス、水素ガス又は窒素ガスにより流動させながら５０
０〜６００℃で焼成することを特徴とする。According to the method of the present invention for producing a raw material powder for a permanent magnet, a needle-shaped iron powder is compression-molded in the presence of a magnetic field, and then the compression-molded product is treated in a non-oxidizing gas atmosphere.
The mixture is fired at 0 ° C. to 1000 ° C., and the obtained fired product is pulverized and mixed with a fine powder of a magnetic property improving component, and the mixture is mixed with an argon gas, a hydrogen gas or a nitrogen gas while flowing the mixture.
It is characterized by firing at 0 to 600 ° C.
【０００６】本発明は、鉄成分に添加する磁気特性改良
成分の選択に関するものではなく、鉄成分の出発原料と
して針状鉄粉を使用すること、そしてその針状鉄粉に特
定の処理をしてから磁気特性改良成分を添加することに
より、組成的には同一であっても、磁気特性が向上した
永久磁石用原料粉末が得られるという新規な知見に基づ
くものである。The present invention does not relate to the selection of a magnetic property improving component to be added to an iron component, but uses acicular iron powder as a starting material for the iron component, and performs a specific treatment on the acicular iron powder. This is based on the novel finding that by adding a magnetic property improving component afterwards, a raw material powder for a permanent magnet having improved magnetic properties can be obtained even if the composition is the same.
【０００７】[0007]
【発明の実施の形態】針状鉄粉は、ＦｅＯＯＨ（ゲータ
イト）針状結晶を水素雰囲気中で３００〜６００℃に加
熱し水素還元することにより得られる。長さは１０μｍ
以下、幅はその１０分の１乃至５分の１程度のものであ
る。本発明において使用する針状鉄粉はコバルトのよう
な磁気特性改良成分を含有していても良い。BEST MODE FOR CARRYING OUT THE INVENTION Acicular iron powder is obtained by heating an FeOOH (goethite) acicular crystal to 300 to 600 ° C. in a hydrogen atmosphere to reduce hydrogen. Length is 10 μm
Hereinafter, the width is about one tenth to one fifth of that. The acicular iron powder used in the present invention may contain a magnetic property improving component such as cobalt.
【０００８】このような針状鉄粉を、針状鉄粉を磁場の
存在下で圧縮成形した後、圧縮成形物を非酸化性ガス雰
囲気中で８００℃〜１０００℃で焼成すると、圧縮成形
物中の針状鉄粉は溶体化して立方体状となる。得られた
焼成物を粉砕して磁気特性改良成分の微粉末と混合す
る。磁気特性改良成分としては公知の成分のいずれでも
良いが、特にネオジム、プラセオジムのような希土類金
属、又は希土類金属とホウ素の組み合わせが好ましい。
ホウ素に代えて、あるいはホウ素と共に、珪素、クロ
ム、チタン、マンガン、銅、ニッケル、バナジウムの中
の少なくとも１種を添加しても良い。The acicular iron powder is compression-molded in a non-oxidizing gas atmosphere at 800 ° C. to 1000 ° C. after the acicular iron powder is compression-molded in the presence of a magnetic field. The acicular iron powder in the solution turns into a cubic solution. The obtained fired product is pulverized and mixed with a fine powder of a magnetic property improving component. The magnetic property improving component may be any of the known components, but is preferably a rare earth metal such as neodymium or praseodymium, or a combination of a rare earth metal and boron.
Instead of or together with boron, at least one of silicon, chromium, titanium, manganese, copper, nickel, and vanadium may be added.
【０００９】焼成・粉砕した鉄粉と磁気特性改良成分と
の混合物はアルゴンガス、水素ガス又は窒素ガスにより
流動させながら５００〜６００℃で焼成する。添加した
磁気特性改良成分は鉄粉の表層に拡散し、磁気特性を向
上させる。The mixture of the calcined and pulverized iron powder and the magnetic property improving component is calcined at 500 to 600 ° C. while flowing with argon gas, hydrogen gas or nitrogen gas. The added magnetic property improving component diffuses into the surface layer of the iron powder and improves the magnetic properties.
【０００９】添加する磁気特性改良成分はできるだけ微
粉末である方が拡散が早いので好ましいが、機械的粉砕
では限度がある。流動用ガスとして最初水素ガスを使用
すると、ネオジム、プラセオジムのような希土類金属な
どには水素が吸蔵される。次いで流動用ガスとしてアル
ゴンガス又は窒素ガスを使用すると吸蔵された水素が放
出され、この際水素を吸蔵していた金属の解砕現象が起
きる。この現象を利用して、流動用ガスとして水素ガ
ス、次いでアルゴンガス又は窒素ガスの使用を繰り返す
ことにより磁気特性改良成分を水素解砕して微粒子化
し、鉄粉表層への拡散を早めることができる。The magnetic property improving component to be added is preferably in the form of a fine powder as much as possible because of rapid diffusion, but there is a limit in mechanical pulverization. When hydrogen gas is first used as a fluidizing gas, hydrogen is absorbed in rare earth metals such as neodymium and praseodymium. Next, when an argon gas or a nitrogen gas is used as the flowing gas, the occluded hydrogen is released, and at this time, the metal that has occluded the hydrogen undergoes a crushing phenomenon. By utilizing this phenomenon, the magnetic property improving component is hydrogen-crushed into fine particles by repeating the use of hydrogen gas, and then argon gas or nitrogen gas as a fluidizing gas, and diffusion to the iron powder surface layer can be accelerated. .
【００１０】本発明により得られた永久磁石用原料粉末
は常法により燒結磁石又はボンド磁石とすることができ
る。The raw material powder for a permanent magnet obtained by the present invention can be made into a sintered magnet or a bonded magnet by an ordinary method.
【００１１】以下実施例により本発明の構成及び効果を
具体的に説明するが、本発明は下記の実施例に限定され
るものではない。Hereinafter, the structure and effects of the present invention will be specifically described with reference to examples, but the present invention is not limited to the following examples.
【００１２】[0012]
【実施例１】ゲータイト針状結晶を水素還元することに
より得られた平均長さ約２μｍ、縦横比が幅が約１０：
１の針状鉄粉を１０ＫＯｅの磁場の存在下で３ｔ／ｃｍ
2 の圧力で圧縮成形した後、アルゴンガス雰囲気中で９
００℃で焼成した。針状鉄粉は溶体化して立方体状とな
った。得られた焼成物を粉砕し、磁気特性改良成分とし
て金属ネオジム微粉末、ホウ素微粉末及びコバルト微粉
末を最終的にＮｄ：８重量％、Ｂ：５重量％、Ｃｏ：１
０重量％、残りが鉄粉になる割合で混合し、混合物をア
ルゴンガスにより流動させながら５００℃で２０時間焼
成して永久磁石用原料粉末を製造した。この原料粉末を
１０ＫＯｅの磁界中で３ｔ／ｃｍ2 の圧力で成形し、真
空中で１０００℃で１時間維持して燒結させた後、エイ
ジングして永久磁石を得た。この永久磁石について最大
エネルギー積ＢＨｍａｘ、残留磁束密度Ｂｒ、及び保磁
力ｉＨｃを測定した結果を表１に示す。Example 1 An average length obtained by hydrogen reduction of goethite needle-like crystals was about 2 μm and an aspect ratio was about 10:
1 needle iron powder in the presence of a magnetic field of 10 KOe at 3 t / cm
After compression molding at a pressure of 2 , 9
Fired at 00 ° C. The needle-like iron powder turned into a solution and became cubic. The obtained calcined product is pulverized, and finally, as a magnetic property improving component, a metal neodymium fine powder, a boron fine powder and a cobalt fine powder are finally Nd: 8% by weight, B: 5% by weight, Co: 1.
The mixture was mixed at a ratio of 0% by weight to the balance of iron powder, and calcined at 500 ° C. for 20 hours while flowing the mixture with argon gas to produce a raw material powder for a permanent magnet. The raw material powder was molded in a magnetic field of 10 KOe at a pressure of 3 t / cm 2 , sintered at 1000 ° C. for 1 hour in a vacuum, and then aged to obtain a permanent magnet. Table 1 shows the measurement results of the maximum energy product BHmax, the residual magnetic flux density Br, and the coercive force iHc of this permanent magnet.
【００１３】[0013]
【比較例１】原料針状鉄粉を、磁場が存在しない状態で
圧縮成形した以外は実施例１と同様にして永久磁石用原
料粉末を製造した。この原料粉末から実施例１と同様に
して永久磁石を得た。この永久磁石について最大エネル
ギー積ＢＨｍａｘ、残留磁束密度Ｂｒ、及び保磁力ｉＨ
ｃを測定した結果を表１に示す。Comparative Example 1 A raw material powder for a permanent magnet was produced in the same manner as in Example 1 except that the raw needle-shaped iron powder was compression-molded in the absence of a magnetic field. A permanent magnet was obtained from this raw material powder in the same manner as in Example 1. For this permanent magnet, the maximum energy product BHmax, residual magnetic flux density Br, and coercive force iH
Table 1 shows the results of measuring c.
【００１４】[0014]
【表１】 [Table 1]
【００１５】表１に示した実施例１と比較例１の対比か
ら明らかなように、同一組成であっても、磁場が存在す
る状態で針状鉄粉を圧縮成形後焼成した鉄粉を使用する
本発明は、磁場が存在しない状態で針状鉄粉を圧縮成形
後焼成した場合に比べて磁気特性の向上が顕著である。As is clear from the comparison between Example 1 and Comparative Example 1 shown in Table 1, even if the composition is the same, an iron powder obtained by compression molding acicular iron powder in the presence of a magnetic field and then firing is used. According to the present invention, the magnetic properties are remarkably improved as compared with the case where the acicular iron powder is compressed and fired in the absence of a magnetic field.
Claims (2)
後、圧縮成形物を非酸化性ガス雰囲気中で８００℃〜１
０００℃で焼成し、得られた焼成物を粉砕して磁気特性
改良成分の微粉末と混合し、混合物をアルゴンガス、水
素ガス又は窒素ガスにより流動させながら５００〜６０
０℃で焼成することを特徴とする永久磁石用原料粉末の
製造方法。After the acicular iron powder is compression-molded in the presence of a magnetic field, the compact is molded in a non-oxidizing gas atmosphere at 800 ° C. to 1 ° C.
Baking at 000 ° C., pulverizing the obtained baking product and mixing it with a fine powder of a magnetic property improving component, while flowing the mixture with argon gas, hydrogen gas or nitrogen gas for 500 to 60
A method for producing a raw material powder for a permanent magnet, characterized by firing at 0 ° C.
請求項１に記載の永久磁石用原料粉末の製造方法。2. The method according to claim 1, wherein the magnetic property improving component is a rare earth metal.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8281930A JPH10125517A (en) | 1996-10-24 | 1996-10-24 | Manufacture of raw material powder for permanent magnet |
| TW085115702A TW345666B (en) | 1996-10-24 | 1996-12-19 | Manufacture of raw material powder for permanent magnet |
| KR1019970008193A KR19980032050A (en) | 1996-10-24 | 1997-03-12 | Manufacturing method of raw powder for permanent magnet |
| CN97120487A CN1104984C (en) | 1996-10-24 | 1997-10-21 | Method for preparing powder of raw material for making permanent magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8281930A JPH10125517A (en) | 1996-10-24 | 1996-10-24 | Manufacture of raw material powder for permanent magnet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10125517A true JPH10125517A (en) | 1998-05-15 |
Family
ID=17645929
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8281930A Pending JPH10125517A (en) | 1996-10-24 | 1996-10-24 | Manufacture of raw material powder for permanent magnet |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPH10125517A (en) |
| KR (1) | KR19980032050A (en) |
| CN (1) | CN1104984C (en) |
| TW (1) | TW345666B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105057097A (en) * | 2015-09-16 | 2015-11-18 | 重庆市九瑞粉末冶金有限责任公司 | Waterfall type separation device for magnetic iron powder particles |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE502006008730D1 (en) * | 2006-12-01 | 2011-02-24 | Ruthner Michael Johann | Process for producing iron powder or steel powder from iron oxide powder by oxidation and reduction |
-
1996
- 1996-10-24 JP JP8281930A patent/JPH10125517A/en active Pending
- 1996-12-19 TW TW085115702A patent/TW345666B/en active
-
1997
- 1997-03-12 KR KR1019970008193A patent/KR19980032050A/en not_active Application Discontinuation
- 1997-10-21 CN CN97120487A patent/CN1104984C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105057097A (en) * | 2015-09-16 | 2015-11-18 | 重庆市九瑞粉末冶金有限责任公司 | Waterfall type separation device for magnetic iron powder particles |
Also Published As
| Publication number | Publication date |
|---|---|
| TW345666B (en) | 1998-11-21 |
| CN1184724A (en) | 1998-06-17 |
| CN1104984C (en) | 2003-04-09 |
| KR19980032050A (en) | 1998-07-25 |
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