CN1030290C - 具有高强度的注射成型纯铁烧结材料的制造方法 - Google Patents
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- 238000009770 conventional sintering Methods 0.000 abstract 1
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Abstract
具有高强度的注射成型纯铁烧结材料的制造方法,它包括:将纯铁粉末和占总体重量8-15%的热塑性树脂粘结剂混炼然后粉碎,由粉碎合的材料成型得到注射成型体,其特征是,该方法还包括,将该注射成型体在680-750℃温度下高温脱脂1-5小时成为预烧结体,其中来源于粘结剂的碳的含量在0.05%(重量)以下,最后将该预烧结体在870-910℃下进行低温烧结1-5小时。
Description
本发明的制造方法属于利用注射成型制造高强度纯铁烧结材料的制造方法。
以往,已知的注射成型纯铁烧结材料的制造方法一般是由以下步骤构成:在平均颗粒直径在15μm以下的羰基铁粉等纯铁粉末中加入占总体重量8-15%的热塑性树脂粘结剂,用捏合机在135℃的温度下加热混炼3小时,待温度降低到室温后在捏合机内将其粉碎,使之成为直径1-5mm左右的颗粒料,用注射成型机在压力为500-700kgf/cm2、颗粒料温度130-145℃、成型周期为20-4秒/次的条件下将上述颗粒料注射成型,制成具有规定形状的成型体,接着,将该注射成型体在例如氢等还原性气氛中于300-500℃温度下脱脂,为了保持形状,在上述粘结剂还剩留10-20%(重量)的时候即停止脱脂,然后,将结果得到的理论密度比为50-70%的脱脂成型体同样在氢等还原气氛中、在1100-1400℃温度下进行长时间(10-20小时)烧结,以便将上述粘结剂完全除去。美国专利US4,113,480提出了一种金属粉零件的注射成型方法,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。此外,人们还知道,用这种方法制造的注射成型纯铁烧结材料可以用来作为各种电气电子仪器的结构部件。
近年来,伴随着各种电气电子仪器、设备的减轻劳动、减小重量以及小型化的趋势,要求其结构部件薄壁化,但是,上述现有技术的注射成型纯铁烧结材料不具备足够的强度,因此无法满足这一要求。
鉴于以上所述,要求制造出具有高强度的注射成型纯铁烧结材料。因此,本发明人对此进行了研究,得到了下述研究结果。
关于注射成型体的脱脂,如前所述现有技术方法是在300-500℃温度下进行的,而且,为了保持形状,在还存留有相当数量的粘结剂的情况下即终止脱脂处理。然而本发明人发现在680-750℃的高温下对注射成型体进行脱脂,可将粘结剂几乎全部除掉,得到碳含量在0.05%(重量)以下的预烧结体(理论密度比为60-70%)。另外,关于后续烧结,由此只能得到理论密度比为90-95%左右的注射成型纯铁烧结材料。与此相比,如果在比1100-1400℃低的870-910℃的温度下进行后续烧结,在1-5小时的短时间内即可得到理论密度比为96-99%的高密度注射成型纯铁烧结材料,所得到的注射成型纯铁烧结材料由于上述高密度而具有高的强度。
本发明是基于上述研究结果而做出的,其特征是,在用注射成型机制成成型体以后,接着将上述注射成型体在680-750℃的温度下高温脱脂1-5小时,使来源于上述粘结剂的碳的含量在0.05%(重量)以下,型成预烧结体,然后将该预烧结体在870-910℃的温度下低温烧结1-5小时,从而制成具有高强度的注射成型纯铁烧结材料。
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)则不能确保注射成型性,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型纯铁烧结材料,不能保证所要求的高强度,因此将粘结剂的比例定为8-15%(重量)。
(b)脱脂温度
脱脂温度如果低于680℃,预烧结不充分,难以保持形状,而且脱脂需要很长时间;反之,脱脂温度如超过750℃,要想使烧结后的注射成型纯铁烧结材料达到理论密度比为96%以上的高密度是不可能的,因此将这一温度定为680-750℃。
(c)预烧结体的碳含量
如果降低预烧结体的碳含量,纯铁烧结材料的理论密度比就会提高,碳含量如果超过0.05%(重量),纯铁烧结材料的理论密度比就达不到96%,不能保证高强度,因此将该含量定为0.05%(重量)以下。
(d)烧结温度
烧结温度在870℃以下时,不仅烧结不充分,而且不能使纯铁烧结材料的密度提高,反之,如果该温度超过910℃也不能实现所希望的密度提高,而且由于晶粒长大,不能够得到所希望的高强度,因此将烧结温度定在870-910℃。
实施例
下面,通过实施例来说明本发明的方法。
将具有表1中所示平均颗粒直径的羰基铁粉与热塑性树脂粘结剂按表1中所示的比例混合,热塑性树脂粘结剂是以乙烯-乙酸乙烯共聚物和石蜡为主要成份构成。用捏和机在135℃温度下将上述混合物加热混炼3小时,再用捏和机在室温下将其粉碎,制成以颗粒大小分布在1-5mm范围内的颗粒为主体的颗粒料,然后,用注射成型机在压力为600kgf/cm2、颗粒料温度140℃、成型周期为30秒/次的条件下将上述颗粒料注射成型,型成平面尺寸为30mm×40mm、厚度1.5mm的注射成型体,在表1中所示的条件下对该注射成型体进行脱脂处理,得到具有表1中所示理论密度比及碳含量的预烧结体或脱脂成型体,然后按表1中所示的条件对其进行烧结处理,从而实施本发明方法1-5和现有技术方法1-5,分别制成注射成型纯铁烧结材料。(表1见文)
随后,测定所得到的纯铁烧结材料的理论密度比和抗拉强度,测试结果示于表2中。
由表1和表2中所示的结果可以看出,采用本发明的方法1-5制造的纯铁烧结材料均比按现有技术方法1-5制造的纯铁烧结材料的密度高,因而具有更高的强度。
前已述及,采用本发明的方法可以制造具有高强度的注射成型纯铁烧结材料,因而在用作各种电气、电子仪器设备的结构部件时可以实现薄壁化,有助于节省劳力、减轻重量以及机器的小型化,在工业生产上带来了有益的效果。
注射成型纯铁结材料
类别
理论密度比 抗拉强度
(%) (kgf/mm2)
1 96 31
2 97 31
本发明的
3 98 32
方法
4 96 30
5 99 33
1 94 25
2 93 23
现有技术
3 93 23
方法
4 92 22
5 94 24
表1
预烧结体或
混合比例(重量%) 脱脂条件 预烧结条件
脱脂成型体
类
铁粉 保持 理论 碳含量 温度 保持
别 温度
粘结剂 气氛 时间 密度比 气氛 时间
平均粒径 (℃)
(μm) (小时) (%) (重量%) (℃) (小时)
1 15 90 10 H2680 5 60 0.046 H2+10%Ar 900 1
本
2 12 92 8 H2+10%Ar 710 2 62 0.034 H2900 3
发
明 3 6 85 15 氨分解气 750 1 64 0.006 H2900 5
方
4 9 91 9 H2710 3 60 0.020 氨分解气 870 3
法
5 4 92 8 H2710 5 61 0.007 H2910 5
1 15 90 10 H2300 5 63 1.5 氨分解气 1250 20
现
有 2 7 92 8 H2+10%Ar 400 5 62 1.2 H21250 15
技
3 4 85 15 氨分解气 500 5 62 0.9 H2+10%Ar 1250 10
术
方 4 8 91 9 H2400 5 62 1.2 H21100 10
法 5 6 88 12 H2400 5 62 1.2 氨分解气 1400 15
Claims (1)
1、具有高强度的注射成型纯铁烧结材料的制造方法,所述方法包括,在纯铁粉末中加入占总体重量8-15%的热塑性树脂粘结剂,加热混炼、在室温下粉碎后用注射成型机使之成为成型体,所述方法的特征在于,在制成成型体以后,该方法还包括,在680-750℃温度下将上述注射成型体高温脱脂1-5小时,形成预烧结体,其中来源于上述粘结剂的碳的含量在0.05%(重量)以下,然后将该预烧结体在870-910℃温度下进行低温烧结1-5小时。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP200113/91 | 1991-07-15 | ||
JP3200113A JPH0521220A (ja) | 1991-07-15 | 1991-07-15 | 高い残留磁束密度を有する射出成形純鉄焼結軟磁性材の製造法 |
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CN1070601A CN1070601A (zh) | 1993-04-07 |
CN1030290C true CN1030290C (zh) | 1995-11-22 |
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Country Status (7)
Country | Link |
---|---|
US (1) | US5277867A (zh) |
EP (1) | EP0523651B1 (zh) |
JP (1) | JPH0521220A (zh) |
KR (1) | KR930002024A (zh) |
CN (1) | CN1030290C (zh) |
DE (1) | DE69217753D1 (zh) |
MY (1) | MY107712A (zh) |
Cited By (1)
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CN102695471A (zh) * | 2009-08-27 | 2012-09-26 | Wdt沃尔茨口腔科技有限公司 | 用于由牙科用金属粉末制造假牙部件的方法 |
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US5988689A (en) * | 1997-12-26 | 1999-11-23 | Central Plastics Company | Heat-shrinkable electrofusion fittings and methods |
JP2002098599A (ja) * | 2000-09-27 | 2002-04-05 | Toyoda Mach Works Ltd | トルクセンサ |
JP4483880B2 (ja) * | 2007-03-15 | 2010-06-16 | セイコーエプソン株式会社 | 成形体形成用組成物、脱脂体および焼結体 |
DE102013010237A1 (de) * | 2013-06-18 | 2014-12-18 | Elino Industrie-Ofenbau Gmbh | Verfahren und Anlage zum Entbindern und Sintern von Teilen |
CN104043835A (zh) * | 2014-06-03 | 2014-09-17 | 宝得粉末注射成形(常熟)有限公司 | 电脑针织横编机用的压脚控制凸轮的加工方法 |
CN105733499B (zh) * | 2016-01-29 | 2018-05-11 | 合肥工业大学 | 一种用于高强度金属注射成型的粘结剂组元及其制备方法 |
KR102326946B1 (ko) | 2020-10-15 | 2021-11-16 | 이남호 | 낱개형 쌈장 및 이의 제조방법 |
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US3411902A (en) * | 1968-01-22 | 1968-11-19 | Mallory & Co Inc P R | Method of producing infiltrated contact material |
US4492671A (en) * | 1982-03-15 | 1985-01-08 | Leland Stanford Junior University | Method for consolidation of iron-based alloy powder by cyclic phase transformation under pressure |
DE3587977T2 (de) * | 1984-02-28 | 1995-05-18 | Sumitomo Spec Metals | Dauermagnete. |
US4885133A (en) * | 1986-01-14 | 1989-12-05 | Sumitomo Electric Industries, Ltd. | Wear-resistant sintered iron-based alloy and process for producing the same |
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 |
JPH0647684B2 (ja) * | 1989-01-20 | 1994-06-22 | 川崎製鉄株式会社 | 射出成形体の脱脂方法 |
JPH0394045A (ja) * | 1989-09-06 | 1991-04-18 | Brother Ind Ltd | 低膨脹焼結合金成形品 |
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- 1991-07-15 JP JP3200113A patent/JPH0521220A/ja not_active Withdrawn
-
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- 1992-07-14 KR KR1019920012511A patent/KR930002024A/ko not_active Application Discontinuation
- 1992-07-14 MY MYPI92001205A patent/MY107712A/en unknown
- 1992-07-15 EP EP92112061A patent/EP0523651B1/en not_active Expired - Lifetime
- 1992-07-15 CN CN92109517A patent/CN1030290C/zh not_active Expired - Fee Related
- 1992-07-15 US US07/914,856 patent/US5277867A/en not_active Expired - Fee Related
- 1992-07-15 DE DE69217753T patent/DE69217753D1/de not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN102695471A (zh) * | 2009-08-27 | 2012-09-26 | Wdt沃尔茨口腔科技有限公司 | 用于由牙科用金属粉末制造假牙部件的方法 |
CN102695471B (zh) * | 2009-08-27 | 2015-05-13 | Wdt沃尔茨口腔科技有限公司 | 用于由牙科用金属粉末制造假牙部件的方法 |
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Publication number | Publication date |
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JPH0521220A (ja) | 1993-01-29 |
EP0523651A2 (en) | 1993-01-20 |
KR930002024A (ko) | 1993-02-22 |
EP0523651A3 (en) | 1993-04-21 |
CN1070601A (zh) | 1993-04-07 |
EP0523651B1 (en) | 1997-03-05 |
MY107712A (en) | 1996-05-30 |
DE69217753D1 (de) | 1997-04-10 |
US5277867A (en) | 1994-01-11 |
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