JP2017128793A - 重希土類元素を含まない焼結Nd−Fe−B磁性体の製造方法 - Google Patents
重希土類元素を含まない焼結Nd−Fe−B磁性体の製造方法 Download PDFInfo
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- 229910001172 neodymium magnet Inorganic materials 0.000 title claims abstract description 39
- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 239000000758 substrate Substances 0.000 title abstract 3
- 239000001257 hydrogen Substances 0.000 claims abstract description 34
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 34
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000000314 lubricant Substances 0.000 claims abstract description 19
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 9
- 229910052802 copper Inorganic materials 0.000 claims abstract description 9
- 229910052733 gallium Inorganic materials 0.000 claims abstract description 9
- 238000000465 moulding Methods 0.000 claims abstract description 8
- 239000000696 magnetic material Substances 0.000 claims description 48
- 239000000843 powder Substances 0.000 claims description 37
- 238000000034 method Methods 0.000 claims description 35
- 238000005245 sintering Methods 0.000 claims description 26
- 229910045601 alloy Inorganic materials 0.000 claims description 25
- 239000000956 alloy Substances 0.000 claims description 25
- 238000000137 annealing Methods 0.000 claims description 16
- 229910052760 oxygen Inorganic materials 0.000 claims description 16
- 229910052757 nitrogen Inorganic materials 0.000 claims description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 10
- 239000007789 gas Substances 0.000 claims description 10
- 229910052799 carbon Inorganic materials 0.000 claims description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 8
- 150000002431 hydrogen Chemical class 0.000 claims description 8
- 239000011265 semifinished product Substances 0.000 claims description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 7
- 239000001301 oxygen Substances 0.000 claims description 7
- 229910052786 argon Inorganic materials 0.000 claims description 4
- 238000006356 dehydrogenation reaction Methods 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 238000010298 pulverizing process Methods 0.000 abstract description 9
- 238000010438 heat treatment Methods 0.000 abstract description 4
- 239000006247 magnetic powder Substances 0.000 abstract description 4
- 239000000701 coagulant Substances 0.000 abstract 1
- 239000012530 fluid Substances 0.000 abstract 1
- 238000011534 incubation Methods 0.000 description 12
- 239000013078 crystal Substances 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 239000000047 product Substances 0.000 description 7
- 238000005266 casting Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 229910052692 Dysprosium Inorganic materials 0.000 description 4
- 150000002910 rare earth metals Chemical class 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- KBQHZAAAGSGFKK-UHFFFAOYSA-N dysprosium atom Chemical compound [Dy] KBQHZAAAGSGFKK-UHFFFAOYSA-N 0.000 description 3
- 230000005389 magnetism Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052771 Terbium Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005324 grain boundary diffusion Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
Description
(a)重量パーセントで、Pr−Ndを31%〜34%、Bを0.8%〜1.2%、Alを0.4%〜0.8%、Coを0.6%〜1.2%、Cuを0.2%〜0.5%、Gaを0.1%〜0.4%、残りはFe、をNd−Fe−B合金に配合し、ストリップキャスト法により厚さが0.1〜0.6mmの薄片に調製する工程と、
(b)得られた薄片を水素デクレピテーション処理し、水素吸蔵圧力が0.15〜0.3Mpa、水素吸蔵時間が3.5時間、550℃で脱水素化を行って合金粉末を得る工程と、
(c)水素処理後の合金粉末中に0.05〜0.5重量%の潤滑剤を添加し、その後流動層式対向型ジェットミルにより紛体メディアン径D50=2.0〜3.0μmまで粉砕する工程と、
(d)ジェットミルで調製した粉体中に0.03〜0.2重量%の潤滑剤を添加し、3D混合器で1〜2時間混合し、配向磁場が2.0〜2.5Tの条件下でプレス成型する工程と、
(e)プレス成型した半製品を真空焼結炉中で焼結し、焼結温度は880℃〜1030℃、焼結時間は6〜15時間であり、冷却後780℃〜860℃で第1段アニーリング処理を行い、保温時間は3時間であり、最後に480〜550℃で第2段アニーリング処理を行い、保温時間は2〜8時間であり、保温過程において真空度は5×10−2Pa以下である焼結及び冷却工程を含む、
ことを特徴とする。
Claims (3)
- 重希土類元素を含まない焼結Nd−Fe−B磁性体の製造方法であって、
(a)重量パーセントで、Pr−Ndを31%〜34%、Bを0.8%〜1.2%、Alを0.4%〜0.8%、Coを0.6%〜1.2%、Cuを0.2%〜0.5%、Gaを0.1%〜0.4%、残りはFe、をNd−Fe−B合金に配合し、ストリップキャスト法により厚さが0.1〜0.6mmの薄片に調製する工程と、
(b)得られた薄片を水素デクレピテーション処理し、水素吸蔵圧力が0.15〜0.3Mpa、水素吸蔵時間が3.5時間、550℃で脱水素化を行って合金粉末を得る工程と、
(c)水素処理後の合金粉末中に0.05〜0.5重量%の潤滑剤を添加し、その後流動層式対向型ジェットミルにより紛体メディアン径D50=2.0〜3.0μmまで粉砕する工程と、
(d)ジェットミルで調製した粉体中に0.03〜0.2重量%の潤滑剤を添加し、3D混合器で1〜2時間混合し、配向磁場が2.0〜2.5Tの条件下でプレス成型する工程と、
(e)プレス成型した半製品を真空焼結炉中で焼結し、焼結温度は880℃〜1030℃、焼結時間は6〜15時間であり、冷却後780℃〜860℃で第1段アニーリング処理を行い、保温時間は3時間であり、最後に480〜550℃で第2段アニーリング処理を行い、保温時間は2〜8時間であり、保温過程において真空度は5×10−2Pa以下である焼結及び冷却工程を含む、
ことを特徴とする重希土類元素を含まない焼結Nd−Fe−B磁性体の製造方法。 - 前記(c)工程における流動層式対向型ジェットミルの粉砕気体が窒素又はアルゴンである、
ことを特徴とする請求項1に記載の重希土類元素を含まない焼結Nd−Fe−B磁性体の製造方法。 - 前記(a)〜(e)の各工程において、酸素含有量を制御し、磁性体中のC、O、N含有量が1.2C+0.6O+N≦2800ppmを満たす、
ことを特徴とする請求項1に記載の重希土類元素を含まない焼結Nd−Fe−B磁性体の製造方法。
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