JP2021077883A - 希土類異方性ボンド磁性粉の作製方法 - Google Patents
希土類異方性ボンド磁性粉の作製方法 Download PDFInfo
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- 239000006247 magnetic powder Substances 0.000 title claims abstract description 66
- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 57
- 150000002910 rare earth metals Chemical class 0.000 title claims abstract description 46
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000002994 raw material Substances 0.000 claims abstract description 33
- 239000000843 powder Substances 0.000 claims abstract description 32
- 239000000203 mixture Substances 0.000 claims abstract description 24
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 19
- 150000004678 hydrides Chemical class 0.000 claims abstract description 18
- 229910052779 Neodymium Inorganic materials 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 16
- 238000009792 diffusion process Methods 0.000 claims abstract description 12
- 229910052777 Praseodymium Inorganic materials 0.000 claims abstract description 7
- 229910052723 transition metal Inorganic materials 0.000 claims abstract description 4
- 150000003624 transition metals Chemical group 0.000 claims abstract description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 31
- 230000005291 magnetic effect Effects 0.000 claims description 25
- 239000001257 hydrogen Substances 0.000 claims description 15
- 229910052739 hydrogen Inorganic materials 0.000 claims description 15
- 238000000137 annealing Methods 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 10
- 239000010949 copper Substances 0.000 claims description 9
- 229910052746 lanthanum Inorganic materials 0.000 abstract description 12
- 229910052684 Cerium Inorganic materials 0.000 abstract description 6
- 229910052692 Dysprosium Inorganic materials 0.000 abstract description 5
- 229910052771 Terbium Inorganic materials 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 5
- 230000002708 enhancing effect Effects 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 24
- 238000006356 dehydrogenation reaction Methods 0.000 description 16
- 230000005389 magnetism Effects 0.000 description 13
- 239000013078 crystal Substances 0.000 description 11
- 229910052742 iron Inorganic materials 0.000 description 9
- 230000006798 recombination Effects 0.000 description 9
- 238000005215 recombination Methods 0.000 description 9
- 238000003860 storage Methods 0.000 description 9
- 229910052796 boron Inorganic materials 0.000 description 8
- 238000007323 disproportionation reaction Methods 0.000 description 8
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 8
- 239000000956 alloy Substances 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000012545 processing Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 230000005347 demagnetization Effects 0.000 description 3
- 238000005324 grain boundary diffusion Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- NIPNSKYNPDTRPC-UHFFFAOYSA-N N-[2-oxo-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 NIPNSKYNPDTRPC-UHFFFAOYSA-N 0.000 description 1
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- 230000005290 antiferromagnetic effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000009489 vacuum treatment Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
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Abstract
Description
(1)RTBH(ここで、前記RはNd又はPr/Ndであり、TはFeを含有する遷移金属である)を主成分とする原料粉末を作製するステップと、
(2)前記原料粉末にLa/Ce水素化物及び銅粉を加えて、混合物を作製するステップと、
(3)前記混合物を拡散熱処理して、希土類異方性ボンド磁性粉を得るステップと、
を含む希土類異方性ボンド磁性粉の作製方法を提供する。
(1)RTBH(ここで、前記RはNd又はPr/Ndであり、TはFeを含有する遷移金属である)を主成分とする原料粉末を作製するステップと、
(2)前記原料粉末にLa/Ce水素化物及び銅粉を加えて、混合物を作製するステップと、
(3)前記混合物を雰囲気拡散熱処理して、希土類異方性ボンド磁性粉を得るステップと、
を含む希土類異方性ボンド磁性粉の作製方法を提供する。
b.低速脱水素再結合段階:水素吸蔵不均化段階の終了後、炉内温度を800−900℃に維持し、炉内水素ガス圧を1−10kPaに調整し、10−60分間保温・保圧して低速脱水素再結合段階の処理を完了する。
c.完全脱水素段階:低速脱水素再結合段階の終了後、水素ガス圧を1Pa以下まで急速に真空引きして、完全脱水素段階を完了する。
d.冷却段階:完全脱水素段階の終了後、室温まで冷却し、RTBHを主成分とする原料粉末を得る。
粒度分布試験のパラメーターは、PSA−レーザ粒度分析計により測定され、
保磁力のパラメーターは、磁気性能測定計により測定され、
最大磁気エネルギー積は、磁気性能測定計により測定され、
残留磁気は、磁気性能測定計により測定される。
NdFeBHを主成分とする原料粉末は、以下のステップを有するHDDR法で作製されたものである。
PrNdFeBHを主成分とする原料粉末は、以下のステップを有するHDDR法で作製されたものである。
希土類異方性ボンド磁性粉の作製方法は、以下のステップを含む。
希土類異方性ボンド磁性粉の作製方法は、以下のステップを含む。
希土類異方性ボンド磁性粉の作製方法は、以下のステップを含む。
5.0wt%のLa/Ce水素化物及び5.0wt%の銅粉を加えて混合物を作製したこと以外は、実施例4の方法に従って、希土類異方性ボンド磁性粉を作製した。
4.0wt%のLa/Ce水素化物及び2.0wt%の銅粉を加えて混合物を作製したこと以外は、実施例4の方法に従って、希土類異方性ボンド磁性粉を作製した。
実施例3で作製された希土類異方性ボンド磁性粉と化学組成が完全に同一の希土類合金を用いて、実施例1の方法に従って希土類異方性ボンド磁性粉を作製した。
実施例4で作製された希土類異方性ボンド磁性粉と化学組成が完全に同一の希土類合金を用いて、実施例1の方法に従って希土類異方性ボンド磁性粉を作製した。
実施例5で作製された希土類異方性ボンド磁性粉と化学組成が完全に同一である希土類合金を用いて、実施例1の方法に従って希土類異方性ボンド磁性粉を作製した。
実施例1−2で作製されたRTBHを主成分とする原料粉末の平均粒度D50、保磁力、最大磁気エネルギー積、及び残留磁気をそれぞれ試験し、その結果を表1に示す。実施例3−8及び比較例1−3で作製された希土類異方性ボンド磁性粉の平均粒度D50、保磁力、最大磁気エネルギー積、及び残留磁気をそれぞれ試験し、その結果を表1に示す。試験中、磁性粉を磁場に配向させる必要があり、その配向が完全であることを確保するために、配向磁場は30kOe以上であり、この場合、磁性粉の磁化容易方向が外部磁場の方向に沿って平行に配列した。
上述したように、本発明は、保磁力を高めながらコストを低減できる希土類異方性ボンド磁性粉の作製方法を保護することを目的とする。
Claims (13)
- RTBH(ここで、前記RはNd又はPr/Ndであり、TはFeを含有する遷移金属である)を主成分とする原料粉末を作製するステップ1と、
前記原料粉末にLa/Ce水素化物及び銅粉を加えて、混合物を作製するステップ2と、
前記混合物を雰囲気拡散熱処理して、希土類異方性ボンド磁性粉を得るステップ3と、
を含むことを特徴とする、希土類異方性ボンド磁性粉の作製方法。 - ステップ1では、前記原料粉末の平均粒度D50は80−120μmであることを特徴とする、請求項1に記載の作製方法。
- ステップ1では、原料粉末の重量を基準として、前記Rの含有量は≦28.9wt%であることを特徴とする、請求項1に記載の作製方法。
- ステップ2では、原料粉末の重量を基準として、前記La/Ce水素化物の添加割合は5wt%以下であることを特徴とする、請求項1に記載の作製方法。
- ステップ2では、La/Ce水素化物の重量を基準として、前記銅粉の添加割合は25−100wt%であることを特徴とする、請求項1に記載の作製方法。
- ステップ2では、前記銅粉の平均粒度D50は10μm未満であることを特徴とする、請求項1に記載の作製方法。
- ステップ3では、前記雰囲気拡散熱処理は水素含有雰囲気での熱処理又は真空熱処理を含むことを特徴とする、請求項1〜6のいずれか1項に記載の作製方法。
- 前記水素含有雰囲気での熱処理の条件は、水素ガス圧≦1kPa、焼鈍温度700−900℃、焼鈍時間20−180minを含むことを特徴とする、請求項7に記載の作製方法。
- 前記真空熱処理の条件は、真空度≦5Pa、焼鈍温度700−900℃、焼鈍時間20−180minを含むことを特徴とする、請求項7に記載の作製方法。
- ステップ3では、前記希土類異方性ボンド磁性粉の平均粒度D50は80−120μmであることを特徴とする、請求項1〜6のいずれか1項に記載の作製方法。
- ステップ3では、前記希土類異方性ボンド磁性粉は粒界相及びR2T14B磁性相の結晶粒を含むことを特徴とする、請求項1〜6のいずれか1項に記載の作製方法。
- 前記粒界相中のLa/Ceの含有量とR2T14B磁性相中のLa/Ceの含有量との比率は5より大きいことを特徴とする、請求項11に記載の作製方法。
- 前記粒界相中のCuの含有量とR2T14B磁性相中のCuの含有量との比率は10より大きいことを特徴とする、請求項11に記載の作製方法。
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