CN1030291C - 具有高残留磁通密度的注射成型纯铁烧结软磁性材料的制造方法 - Google Patents
具有高残留磁通密度的注射成型纯铁烧结软磁性材料的制造方法 Download PDFInfo
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Abstract
具有高残留磁通密度和最大导磁率的纯铁烧结软磁性材料的制造方法，它包括将纯铁粉末和占总体重量8-15%(重量)的热塑性树脂粘结剂混炼，粉碎，制成注射成型体；其特征是将该注射成型体在680-750℃脱脂1-5小时成为预烧结体，其中来自粘结剂的含碳量在0.05%(重量)以下，将此预烧结体在870-910℃烧结1-5小时，得到具有96%以上理论密度比的高密度烧结体；最后将上述烧结体在1050-1350℃的温度下进行软磁性化热处理1-3小时。
Description
本发明属于具有高残留磁通密度和最大导磁率的注射成形纯铁烧结软磁性材料的制造方法。
以往在一般情况下，例如使用纯铁烧结软磁性材料作为轭铁材料应用在各种电气电子仪器设备的结构部件，制造这种纯铁烧结软磁材料的公知方法是：使用平均粒经50-100μm的纯铁粉末作为原料粉末，将其用压力机以5-7吨/厘米2的压力成形为压坯，然后将压坯在氢或氨的分解气体的气氛中用1100-1400℃的温度烧结。美国专利US4，113，480提出了一种金属粉零件的注射成形方法，该方法包括，将金属粉末与含有机粘结剂的塑料介质相混合;在室温和压力下注射该塑性混合物入模具中;取出该密集体并进行干燥以除去多余的溶剂等。
近年来，伴随着各种电气电子仪器、设备的节省劳力、减轻重量和小型化趋势，要求其结构部件薄壁化，但上述现有技术的纯铁烧结软磁性材料由于理论密度比为85-95%低密度的原因，残留磁通密度特别低，因而无法满足上述要求。
鉴于以上所述，本发明人研究使纯铁烧结软磁性材料的高密度化，以使其残留磁通密度提高，进行研究的结果如下：
向平均粒径在15μm以下的羰基铁粉等纯铁粉末中加入占总体重量为8-15%（重量）的热塑性树脂粘结剂，用捏合机于温度135℃下加热混炼3小时，待温度降至室温以下，在捏合机内将其粉碎，制成直径1-5mm左右的颗粒料。将该颗粒料用注射
成形机，以压力为500-700kgf/cm2，颗粒料温度为130-145℃，成形周期为20-40秒/次的条件注射成形，制成具有规定形状的成形体。将上述注射成形体在680-750℃的温度下脱脂，使来源于上述粘结剂的碳含量在0.05%（重量）以下，以形成预烧结体;然后，将该预烧结体在例如氢等还原性气氛中和870-910℃的温度下烧结，于是形成具有96%以上理论密度的烧结体。最后，将上述高密度烧结体在氢等还原气氛中或真空中加热至1050-1350℃，并进行保温软磁化处理。研究结果发现，与上述现有技术相比，本发明方法所得到的注射成形纯铁烧结软磁性材料显示出更加高的残留磁通密度和最大的导磁率。
本发明的方法根据上述研究结果而做出的，其特征是，用注射成形机制成成形体以后将上述注射成形体在680-750℃的温度下脱脂1-5小时成为预烧结体，其中来自粘结剂的碳含量在0.05%（重量）以下。接着，将上述预烧结体在870-910℃的温度下烧结1-5小时，成为具有理论密度比在96%以上的高密度烧结体。对上述高密度烧结体在1050-1350℃的温度下进行软磁化热处理1-3小时。得到具有高残留磁通密度和最大导磁率的注射成形纯铁烧结软磁性材料。
下面说明在本发明的方法中将制造条件做上述限定的根据。
（a）粘结剂的比例
粘结剂的比例如不足8%（重量）则不能确保注射成形性，反之，如这一比例超过15%（重量），则不能制成具有96%以上理论密度比的高密度注射成形纯铁烧结材料，其结果不能确保
高残留磁通密度和最大导磁率。因此将粘结剂比例定为8-15%（重量）。
（b）脱脂温度
脱脂温度低于680°时，预烧结不充分，难以保持形状，而且脱脂需要长时间;反之，温度如超过750℃，要想使烧结体具有理论密度比为96%以上的高密度是不可能的，所以将该温度定为680-750℃。
（c）预烧结体的含碳量
如果预烧结体的碳含量越低，就越能使烧结体的理论密度达到96%以上，而碳含量超过0.05%（重量），则烧结体的理论密度就达不到96%，不能确保所希望的高残留磁通密度，所以将碳含量限定为0.05%（重量）以下。
（d）烧结温度
烧结温度不到870℃时，不仅不能充分烧结，且烧结的密度不能充分提高;反之，烧结温度超过910℃，也不能确保所希望的高密度，因而在该情况下得到理论密度比在96%以上的高密度，因此将烧结温度定在870-910℃。
（e）软磁性化热处理温度
为了确保所希望的高残留磁通密度，有必要对上述高密度烧结体进行软磁化热处理，由于在该温度不足1050℃时不能确保所希望的残留磁通密度;反之温度超过1350℃易引起变形，因此将此温度定为1050-1350℃
实施例
以下通过实施例具体说明本发明的方法。将具有表1所示出平均粒径的羰基铁粉和以将乙烯-乙酸乙烯共聚物和石蜡作为主要
成份的热塑性树脂粘结剂，按照表1所示的比例在捏合机中混合，在温度135℃下进行3小时加热混炼，在同一捏合机中室温下将其粉碎成粒度分布为1-5mm范围内的颗粒为主体的颗粒料，接着将此颗粒料使用通常的注射成形机，在压力：600kgf/cm2，颗粒料温度为140℃，成形周期为30秒/次的条件下注射成形。将此注射成形体在表1所示条件下进行脱脂处理，得到具有表1所示的理论密度比和含碳量的预烧结体。接着在如同表1所示条件下对其进行烧结，得到具有如表2所示理论密度比的高密度烧结体。再将上述烧结体按表2所示的条件进行软磁性化处理，从而实施本发明方法1-9，制造出各自外径为20mm，内径10mm，厚度10mm尺寸的环状注射成形纯铁烧结软磁性材料。
表1
表2
此外，出于比较目的，作为原料粉末使用平均粒径为80μm的气体雾化法铁粉，将其以6吨/厘米2的压力，成形为平面尺寸为30mm×40mm，厚度1.5mm的压坯，接着，将此压坯在氢气氛中、1300℃的温度、保持1小时的条件下经过烧结，制造出具有表2所示理论密度比的现有的纯铁烧结软磁性材料。
接着测定由此结果得到的各种纯铁烧结软磁性材料的残留磁通密度和最大导磁率，并测定保磁力。测定结果示于表2。
由表1、2所示的结果可知，按照本发明方法1-9制造的注射成形纯铁烧结软磁性材料，的确比现有纯铁烧结软磁性材料有更高的密度，据此可知其具有更高一级的残留磁通密度和最大导磁率。
前已述及，采用本发明的方法可以制出具有高残留磁通密度和最大导磁率的注射成形纯铁烧结软磁性材料，因而在用作各种电气电子仪器设备的场合，可实现壁薄化，所以有助于节省劳力、减轻重量以及机器的小型化，在工业上带来了有益的效果。
Claims (1)
1、具有高残留磁通密度的注射成形纯铁烧结软磁性材料的制造方法，所述方法包括向纯铁粉末中加入占总体重量8-15重量%的热塑性树脂粘结剂，加热混炼，在室温下粉碎后，用注射成形机制成成形体
所述方法的特征在于，该方法还包括，在制成成形体以后将上述注射成形体在680-750℃温度下进行1-5小时脱脂，以制成预烧结体，其中要使来自粘结剂的碳含量在0.05重量%以下；
接着将上述预烧结体在870-910℃的温度下烧结1-5小时，得到具有理论密度比为96%以上的高密度烧结体；
以及对上述高密度烧结体在1050-1350℃的温度下进行1-3小时的软磁性化热处理。
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| JP200112/91 | 1991-07-15 | ||
| JP3200112A JPH0525506A (ja) | 1991-07-15 | 1991-07-15 | 高強度を有する射出成形純鉄焼結材の製造法 |
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| CN1070602A CN1070602A (zh) | 1993-04-07 |
| CN1030291C true CN1030291C (zh) | 1995-11-22 |
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| CN1056517C (zh) * | 1994-03-30 | 2000-09-20 | 刘爱武 | 一种消瘿化结药物 |
| US7237730B2 (en) * | 2005-03-17 | 2007-07-03 | Pratt & Whitney Canada Corp. | Modular fuel nozzle and method of making |
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| JP2007217742A (ja) * | 2006-02-15 | 2007-08-30 | Seiko Epson Corp | 焼結体の製造方法および焼結体 |
| US8316541B2 (en) | 2007-06-29 | 2012-11-27 | Pratt & Whitney Canada Corp. | Combustor heat shield with integrated louver and method of manufacturing the same |
| US7543383B2 (en) | 2007-07-24 | 2009-06-09 | Pratt & Whitney Canada Corp. | Method for manufacturing of fuel nozzle floating collar |
| CN102240808A (zh) * | 2011-07-12 | 2011-11-16 | 中南大学 | 一种小型复杂磁屏蔽零部件的制备方法 |
| DE102013010237A1 (de) * | 2013-06-18 | 2014-12-18 | Elino Industrie-Ofenbau Gmbh | Verfahren und Anlage zum Entbindern und Sintern von Teilen |
| CN103464759B (zh) * | 2013-09-05 | 2015-10-21 | 北京科技大学 | 一种制备高性能复杂形状纯铁软磁产品的方法 |
| CN104091667B (zh) * | 2014-06-05 | 2016-09-14 | 浙江大学 | 一种金属磁粉芯的注射成型制备方法 |
| CN107914007B (zh) * | 2017-11-06 | 2019-09-27 | 江苏精研科技股份有限公司 | 一种粉末注射成型用软磁材料及其制备工艺 |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0686608B2 (ja) * | 1987-12-14 | 1994-11-02 | 川崎製鉄株式会社 | 金属粉末射出成形による鉄焼結体の製造方法 |
| WO1989012112A1 (en) * | 1988-05-30 | 1989-12-14 | Kawasaki Steel Corporation | SINTERED MAGNETIC Fe-Co MATERIAL AND PROCESS FOR ITS PRODUCTION |
| US5067979A (en) * | 1988-08-20 | 1991-11-26 | Kawasaki Steel Corporation | Sintered bodies and production process thereof |
| US4964907A (en) * | 1988-08-20 | 1990-10-23 | Kawasaki Steel Corp. | Sintered bodies and production process thereof |
| JP2587872B2 (ja) * | 1988-12-19 | 1997-03-05 | 住友金属鉱山株式会社 | Ｆｅ―Ｓｉ合金軟質磁性焼結体の製造方法 |
| US5032355A (en) * | 1990-10-01 | 1991-07-16 | Sumitomo Metal Mining Company Limited | Method of manufacturing sintering product of Fe-Co alloy soft magnetic material |
-
1991
- 1991-07-15 JP JP3200112A patent/JPH0525506A/ja not_active Withdrawn
-
1992
- 1992-07-14 KR KR1019920012510A patent/KR930003185A/ko not_active Application Discontinuation
- 1992-07-15 US US07/914,854 patent/US5284615A/en not_active Expired - Fee Related
- 1992-07-15 DE DE69217585T patent/DE69217585D1/de not_active Expired - Lifetime
- 1992-07-15 CN CN92109518A patent/CN1030291C/zh not_active Expired - Fee Related
- 1992-07-15 TW TW081105595A patent/TW201710B/zh active
- 1992-07-15 EP EP92112075A patent/EP0523658B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| TW201710B (zh) | 1993-03-11 |
| US5284615A (en) | 1994-02-08 |
| DE69217585D1 (de) | 1997-04-03 |
| EP0523658A2 (en) | 1993-01-20 |
| CN1070602A (zh) | 1993-04-07 |
| EP0523658B1 (en) | 1997-02-26 |
| EP0523658A3 (en) | 1993-04-21 |
| KR930003185A (ko) | 1993-02-24 |
| JPH0525506A (ja) | 1993-02-02 |
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