JP2009246272A - 焼結磁石の製造方法 - Google Patents
焼結磁石の製造方法 Download PDFInfo
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- JP2009246272A JP2009246272A JP2008093849A JP2008093849A JP2009246272A JP 2009246272 A JP2009246272 A JP 2009246272A JP 2008093849 A JP2008093849 A JP 2008093849A JP 2008093849 A JP2008093849 A JP 2008093849A JP 2009246272 A JP2009246272 A JP 2009246272A
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- Powder Metallurgy (AREA)
Abstract
【解決手段】界面活性剤の存在下で磁性粉末を湿式粉砕する工程と、湿式粉砕された前記磁性粉末20を乾燥させ、前記界面活性剤が付着している磁性粉末20を得る工程と、乾燥させた前記磁性粉末20を、バインダ樹脂と共に加熱混練してペレットを形成する工程と、前記ペレットを溶融させ、磁場が印加された金型内で射出成形して予備成形体を得る工程と、前記予備成形体を焼成する工程と、を有する焼結磁石の製造方法。
【選択図】図2
Description
界面活性剤の存在下で磁性粉末を湿式粉砕する工程と、
湿式粉砕された前記磁性粉末を乾燥させ、前記界面活性剤が付着している磁性粉末を得る工程と、
乾燥させた前記磁性粉末を、バインダ樹脂と共に加熱混練してペレットを形成する工程と、
前記ペレットを溶融させ、磁場が印加された金型内で射出成形して予備成形体を得る工程と、
前記予備成形体を焼成する工程と、を有する。
図1は本発明の一実施形態に係る焼結磁石の製造方法に用いる磁場射出成形機の要部断面図、
図2(A)は磁場射出成形する前の磁性粉末の状態を示す概略図、図2(B)は磁場射出成形した後の磁性粉末の配向状態を示す概略図、
図3は磁場射出成形する前のペレットの断面SEM写真である。
A:1〜13原子%、
R:0.05〜10原子%、
Fe:80〜95原子%、
M:0.1〜5原子%である。
実施例1
実施例2
実施例3
8… 金型
10… ペレット
12… キャビティ
20… 磁性粉末
Claims (6)
- 界面活性剤の存在下で磁性粉末を湿式粉砕する工程と、
湿式粉砕された前記磁性粉末を乾燥させ、前記界面活性剤が付着している磁性粉末を得る工程と、
乾燥させた前記磁性粉末を、バインダ樹脂と共に加熱混練してペレットを形成する工程と、
前記ペレットを溶融させ、磁場が印加された金型内で射出成形して予備成形体を得る工程と、
前記予備成形体を焼成する工程と、を有する焼結磁石の製造方法。 - 前記磁性粉末がフェライト粉末であり、乾燥後の前記磁性粉末の平均粒径が、0.03〜0.7μmの範囲内である請求項1に記載の焼結磁石の製造方法。
- 前記界面活性剤が、ソルビトールおよびマンニトールの少なくともいずれかを含む請求項1または2に記載の焼結磁石の製造方法。
- 前記界面活性剤は、前記磁性粉末100重量部に対して0.05〜5重量部含まれる請求項1〜3のいずれかに記載の焼結磁石の製造方法。
- 前記磁性粉末を湿式粉砕する工程が複数ある場合には、最後に湿式粉砕する工程において、前記界面活性剤の存在下で前記磁性粉末を湿式粉砕する請求項1〜4のいずれかに記載の焼結磁石の製造方法。
- 湿式粉砕する工程の前に前記磁性粉末を乾式粗粉砕する工程を有し、前記界面活性剤は乾式粗粉砕する工程で添加される請求項1〜4のいずれかに記載の焼結磁石の製造方法。
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US12/382,985 US8033314B2 (en) | 2008-03-31 | 2009-03-27 | Method for producing sintered magnet |
TW098110634A TWI390555B (zh) | 2008-03-31 | 2009-03-31 | 燒結磁鐵之製造方法 |
CN2009101325245A CN101577177B (zh) | 2008-03-31 | 2009-03-31 | 烧结磁石的制造方法 |
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WO2011115128A1 (ja) * | 2010-03-19 | 2011-09-22 | Tdk株式会社 | フェライト焼結磁石の製造方法、磁性粉末、混練物及び成形体 |
JP2013014464A (ja) * | 2011-07-01 | 2013-01-24 | Tdk Corp | 射出成形用組成物およびその製造方法 |
JP2015103650A (ja) * | 2013-11-25 | 2015-06-04 | Tdk株式会社 | 弓形磁石片およびモータ |
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