JP2018157197A - 高熱安定性の希土類永久磁石材料、その製造方法及びそれを含む磁石 - Google Patents
高熱安定性の希土類永久磁石材料、その製造方法及びそれを含む磁石 Download PDFInfo
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- JP2018157197A JP2018157197A JP2018013691A JP2018013691A JP2018157197A JP 2018157197 A JP2018157197 A JP 2018157197A JP 2018013691 A JP2018013691 A JP 2018013691A JP 2018013691 A JP2018013691 A JP 2018013691A JP 2018157197 A JP2018157197 A JP 2018157197A
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- rare earth
- permanent magnet
- earth permanent
- magnet material
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- 239000000463 material Substances 0.000 title claims abstract description 59
- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 49
- 150000002910 rare earth metals Chemical class 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims description 20
- 238000004519 manufacturing process Methods 0.000 title claims description 19
- 229910052735 hafnium Inorganic materials 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims abstract description 5
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 5
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 4
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 4
- 229910052733 gallium Inorganic materials 0.000 claims abstract description 4
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 4
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 4
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 4
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 4
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 4
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 30
- 239000000956 alloy Substances 0.000 claims description 30
- 238000010438 heat treatment Methods 0.000 claims description 20
- 238000005121 nitriding Methods 0.000 claims description 17
- 238000002425 crystallisation Methods 0.000 claims description 14
- 230000008025 crystallization Effects 0.000 claims description 14
- 238000010791 quenching Methods 0.000 claims description 14
- 230000000171 quenching effect Effects 0.000 claims description 14
- 229910000859 α-Fe Inorganic materials 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 10
- 238000002844 melting Methods 0.000 claims description 9
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- 239000013078 crystal Substances 0.000 claims description 8
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- 229920000647 polyepoxide Polymers 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 229920001187 thermosetting polymer Polymers 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 239000012300 argon atmosphere Substances 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 239000010453 quartz Substances 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000000243 solution Substances 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 2
- 230000001070 adhesive effect Effects 0.000 claims description 2
- 238000001125 extrusion Methods 0.000 claims description 2
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- 239000007924 injection Substances 0.000 claims description 2
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
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- 239000000843 powder Substances 0.000 abstract description 38
- 239000012071 phase Substances 0.000 description 41
- PRQMIVBGRIUJHV-UHFFFAOYSA-N [N].[Fe].[Sm] Chemical compound [N].[Fe].[Sm] PRQMIVBGRIUJHV-UHFFFAOYSA-N 0.000 description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 12
- AWWAHRLLQMQIOC-UHFFFAOYSA-N [Fe].[Sm] Chemical compound [Fe].[Sm] AWWAHRLLQMQIOC-UHFFFAOYSA-N 0.000 description 8
- 230000005347 demagnetization Effects 0.000 description 8
- 230000002427 irreversible effect Effects 0.000 description 8
- 239000002131 composite material Substances 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000000696 magnetic material Substances 0.000 description 4
- 239000006247 magnetic powder Substances 0.000 description 4
- 229910000640 Fe alloy Inorganic materials 0.000 description 3
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- 238000007578 melt-quenching technique Methods 0.000 description 3
- 229910001172 neodymium magnet Inorganic materials 0.000 description 3
- 150000004767 nitrides Chemical class 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
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- 239000002245 particle Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 229910000531 Co alloy Inorganic materials 0.000 description 1
- 229910052772 Samarium Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 description 1
- CLBRCZAHAHECKY-UHFFFAOYSA-N [Co].[Pt] Chemical compound [Co].[Pt] CLBRCZAHAHECKY-UHFFFAOYSA-N 0.000 description 1
- YWTMTKBIVNUPNG-UHFFFAOYSA-N [N].[Fe].[Nd] Chemical compound [N].[Fe].[Nd] YWTMTKBIVNUPNG-UHFFFAOYSA-N 0.000 description 1
- 229910000905 alloy phase Inorganic materials 0.000 description 1
- 229910000828 alnico Inorganic materials 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
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- 230000000694 effects Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000005551 mechanical alloying Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000002159 nanocrystal Substances 0.000 description 1
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- 238000010298 pulverizing process Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- KZUNJOHGWZRPMI-UHFFFAOYSA-N samarium atom Chemical compound [Sm] KZUNJOHGWZRPMI-UHFFFAOYSA-N 0.000 description 1
- 238000003746 solid phase reaction Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
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Abstract
【解決手段】原子パーセントで表される組成成分が、SmxRaFe100−x−y−z−aMyNzであり、ここで、RはZr、Hfのうちの少なくとも1種であり、MはCo、Ti、Nb、Cr、V、Mo、Si、Ga、Ni、Mn、Alのうちの少なくとも1種であり、x+aは7%〜10%であり、aは0%〜1.5%であり、yは0%〜5%であり、zは10%〜14%である。
【選択図】なし
Description
SmxRaFe100−x−y−z−aMyNzであり、
但し、RはZr、Hfのうちの少なくとも1種であり、MはCo、Ti、Nb、Cr、V、Mo、Si、Ga、Ni、Mn、Alのうちの少なくとも1種であり、x+aは7%〜10%であり、aは0%〜1.5%であり、yは0%〜5%であり、zは10%〜14%である。上記範囲はいずれも端点の値を含む。Nは窒素元素である。
但し、RはZr、Hfのうちの少なくとも1種であり、MはCo、Ti、Nb、Cr、V、Mo、Si、Ga、Ni、Mn、Alのうちの少なくとも1種であり、x+aは7%〜10%であり、aは0%〜1.5%であり、yは0%〜5%であり、zは10%〜14%である。上記範囲はいずれも端点の値を含む。Nは窒素元素である。
製造方法は以下のステップを含む。
実施例1〜15で得られた永久磁石材料の性能試験を行い、試験結果を下の表3にまとめる。
Claims (10)
- 原子パーセントで表される組成成分が、
SmxRaFe100−x−y−z−aMyNzである希土類永久磁石材料であって、
ここで、RはZr、Hfのうちの少なくとも1種であり、MはCo、Ti、Nb、Cr、V、Mo、Si、Ga、Ni、Mn、Alのうちの少なくとも1種であり、x+aは7%〜10%であり、aは0%〜1.5%であり、yは0%〜5%であり、zは10%〜14%であることを特徴とする希土類永久磁石材料。 - TbCu7相、Th2Zn17相及び軟磁性相α−Feを含み、
前記希土類永久磁石材料におけるTbCu7相の含有量は50%以上、好ましくは80%以上、さらに好ましくは95%以上であることが好ましく、
前記希土類永久磁石材料におけるTh2Zn17相の含有量は0%〜50%(0を除く)、好ましくは1%〜20%であることが好ましく、
前記希土類永久磁石材料における軟磁性相α−Feの含有量は0%〜5%(0を除く)であることが好ましく、
前記希土類永久磁石材料は、平均サイズが10nm〜1μmであることが好ましく、好ましくは10nm〜200nmである結晶粒からなる、
ことを特徴とする請求項1に記載の希土類永久磁石材料。 - 請求項1又は2に記載の希土類永久磁石材料の製造方法であって、
(1)Sm、R、Fe、Mを母合金となるように溶製するステップと、
(2)ステップ(1)で得られた母合金を急冷させて焼入れリボンを製造するステップと、
(3)ステップ(2)で得られた焼入れリボンの結晶化処理を行うステップと、
(4)ステップ(3)で結晶化された永久磁石材料の窒化により、前記希土類永久磁石材料を得るステップと、を含む製造方法。 - ステップ(1)における溶製は、中間周波数又はアークにより行われ、
溶製により得られたインゴットは、ミリメートルレベルのインゴットブロックになるように予め粉砕されることが好ましい、
ことを特徴とする請求項3に記載の製造方法。 - ステップ(2)における急冷過程は、母合金をノズル付きの石英管に投入し、誘導溶解により溶解させた合金液を、ノズルを通して、回転する水冷される銅製モールドに噴出することにより、焼入れリボンを得るように行われ、
急冷時の車輪速度は20m/s〜80m/sであり、好ましくは40m/s〜50m/sであることが好ましい、
ことを特徴とする請求項3又は4に記載の製造方法。 - ステップ(3)における結晶化処理過程は、焼入れリボンを包んで熱処理を行ってから、焼入れ処理を行うように行われ、
前記熱処理は、管状抵抗炉で行われることが好ましく、
前記熱処理は、アルゴン雰囲気で行われることが好ましく、
前記焼入れ処理は、水冷方式を用いて行われることが好ましく、
前記熱処理の温度は700℃〜900℃であり、時間は5min以上、好ましくは10min〜90minであることが好ましく、
ステップ(3)における結晶化処理後の材料に対して粉砕処理を行うことが好ましく、
50メッシュ以上、好ましくは80メッシュ以上にまで粉砕されることが好ましい、
ことを特徴とする請求項3乃至5のうちいずれか一項に記載の製造方法。 - ステップ(4)における窒化は窒化炉で行われ、
1atm〜2atm、好ましくは1.4atmの高純度窒素雰囲気で行われることが好ましく、
窒化の温度は350℃〜600℃、好ましくは430℃〜470℃、時間は12h以上、好ましくは24hであることが好ましい、
ことを特徴とする請求項3乃至6のうちいずれか一項に記載の製造方法。 - 請求項1又は2に記載の希土類永久磁石材料を含むことを特徴とする磁石。
- 前記希土類永久磁石材料と接着剤とが結合されてなり、
前記磁石は、本発明の希土類永久磁石材料とエポキシ樹脂とを混合して混合材料を得て、混合材料に潤滑剤を添加して処理することによりボンド磁石を得て、最後に、得られたボンド磁石の熱硬化を行うことにより製造されることが好ましい、
ことを特徴とする請求項8に記載の磁石。 - 希土類永久磁石材料とエポキシ樹脂との重量比は100:1〜10、好ましくは100:4であり、
前記潤滑剤の添加量は0.2wt%〜1wt%、好ましくは0.5wt%であることが好ましく、
前記処理は、モールドプレッシング、注射、圧延又は押出しであることが好ましく、
前記モールディングは、タブレットプレスを用いて行われることが好ましく、
前記熱硬化の温度は150℃〜200℃、好ましくは175℃であることが好ましく、時間は0.5h〜5h、好ましくは1.5hであることが好ましい、
ことを特徴とする請求項9に記載の磁石。
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