CN1066355C - 膨胀法长带材导体连续均匀加压工艺及其装置 - Google Patents

膨胀法长带材导体连续均匀加压工艺及其装置 Download PDF

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CN1066355C
CN1066355C CN94110084A CN94110084A CN1066355C CN 1066355 C CN1066355 C CN 1066355C CN 94110084 A CN94110084 A CN 94110084A CN 94110084 A CN94110084 A CN 94110084A CN 1066355 C CN1066355 C CN 1066355C
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姚奇舟
姜明
王文斌
黄建国
乔桂文
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Institute of Metal Research of CAS
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Abstract

一种膨胀法给长带材导体连续均匀加压的工艺,其特征在于工艺步骤如下:a)将待压带材绕在芯轴上;b)将缠绕后的芯轴装入与芯轴膨胀系数不同的材料制成的套筒内;c)将装配后的组件冷却或加热至一定温度;d)恢复初始温度,将芯轴取出,长带与模具分离。本发明专用装置基本上由芯轴和套筒两部分组成,套筒内径与芯轴外径之间预留一定间隙,芯轴和套筒分别使用两种膨胀系数不同的材料制成。本发明利用材料膨胀系数不同而产生的压力实现对长带的连续加压,原理简明,操作方便。

Description

膨胀法长带材导体连续均匀加压工艺及其装置
本发明涉及长带材的连续均匀加压工艺及装置。
自从1987年日本科学家H.Maeda发现Bi-Sr-Ca-Cu-O系高温超导材料以来,各国学者在竞相研究其超导机理和超导电性的同时,也在致力于超导体的实用化研究。高温超导材料最主要的实用化目标是将其制备成具有高载流能力的带材或线材,用以传输电能,或用带(线)材绕制成线圈、螺线管等,以产生一定的电磁场,因此它可以作为超导电缆和液氮温区(77K)的磁体选用材料。而且在10T,4.2K下铋系线材的临界电流密度Jc已大于传统超导体NbTi的Jc值,在16T也超过了Nb3Sn的Jc值。因此其应用前景十分乐观。
在制备铋系带(线)材的众多工艺中,″管中装粉″的方法已经被证明为最佳工艺。即将超导细粉装入银管中,经逐道拉拔成细线,再扎制成薄带(通常0.10~0.20mm厚,2~3mm宽),最后进行烧结处理,成为超导带(线)材。
1989年,日本学者Asano T.首先报道了单轴压制能使Bi系超导体材料(Φ20的小圆片)的临界电流密度Jc有很大提高(日本应用物理杂志,1989年27卷,第1652页)。之后,Yamamda等人又将单轴压制工艺应用于Bi系带材的加工上。他将轧制得到的带材短样(10~50mm长)进行单轴压制其压强为100~200Kg/mm2,发现压制后带材的临界电流密度Jc提高很大,如未压制样品的Jc为3000A/cm2,经第一次压制后达到15000A/cm2,经第二次压制后为23600A/cm2(日本应用物理杂志,1990年,第29卷3期,第456~458页)。随后各国研究人员已经多次证实了压制能提高Bi系带材Jc的结论。由此可见加压工艺对带材的性能起了重要的作用。
但是,短带样品的加压虽然容易,长带(几百至几千mm)的单轴压制就很困难,即使做成了相应的长模具,带材在长度方向上受压也不会均匀。分段压制法压制长1.5米的铋系超导带材,结果Jc提高不大,主要原因是受压制各段之间存在″接头″,影响了长度方向的均匀性。
本发明的目的在于提供一种长带线材的连续均匀加压工艺及装置。
本发明是利用两种材料的热膨胀系数之差而产生的压力来实现对长带材的连续均匀加压的。
本发明提供的一种用膨胀法给长带材连续均匀加压的装置,如图1,其特征在于:装置基本上由芯轴(1)和套筒(2)两部分组成,套筒(2)内径与芯轴(1)外径之间预留一定间隙,芯轴(1)和套筒(2)分别使用两种膨胀系数不同的材料制成。
膨胀法的工艺步骤如下:
a)将待压带材绕在芯轴上;
b)将缠绕后的芯轴装入与芯轴膨胀系数不同的材料制成的套筒内;
c)将装配后的组件冷却或加热至一定温度;
d)恢复初始温度,将芯轴取出,长带与模具分离。
本发明工艺结束了长带的分段式压制工艺可以实现相当长带的连续均匀压制,不仅提高了加压质量,而且提高了加压效率,是长带连续压制工艺的实质性突破,其原理简明,操作方便。
下面通过实施例详细叙述本发明。
附图1膨胀法长带压制装置的原理图。
实施例1
用该工艺压制厚0.15mm,长1200mm的铋系2223相超导带材,压制前Jc为1900A/cm2,经一次压制后Jc达到8500A/cm2,经二次压制后达11500A/cm2
工艺条件:室温装配,冷却至77K,保持10分钟。
实施例2
用该工艺制备Al2O3薄带(银包带厚0.1mm,Al2O3层厚30μm)使用膨胀法ΔT=200℃,使Al2O3的密度从原来的52%理论密度上升为56%理论密度;从而使Al2O3薄带有更高的密度,熔去Ag套后具有更好的韧性和强度。
实施例3
将该工艺用于两种不同金属薄带的压力扩散焊上:将0.05~0.10mm厚,5mm宽,长2米的铝带(含Al>99.3%)和相应尺寸的无氧铜带叠绕后加压。
工艺参数:室温装配,升温至400℃,保持20分钟,真空度为10~3托,使用常规压力扩散焊焊接这两种金属的短带,所测接头的抗拉强度为10.0Kg/mm2,使用新工艺后,由于带材很薄,所以无法测其接头的抗拉强度,但扫描电镜观察其接头至密,接头微观质量达到常规压力扩散焊的水平,更有意义的是解决了长期以来金属薄长带材无法进行压力扩散焊的问题。

Claims (2)

1.一种膨胀法给长带材导体连续均匀加压的工艺,其特征在于工艺步骤如下:
a)将待压带材绕在芯轴上;
b)将缠绕后的芯轴装入与芯轴膨胀系数不同的材料制成的套筒内;
c)将装配后的组件冷却或加热至一定温度;
d)恢复初始温度,将芯轴取出,长带与模具分离。
2.一种用膨胀法给长带材导体连续均匀加压的装置,其特征在于:装置基本上由芯轴(1)和套筒(2)两部分组成,套筒(2)内径与芯轴(1)外径之间预留一定间隙,芯轴(1)和套筒(2)分别使用两种膨胀系数不同的材料制成。
CN94110084A 1993-02-27 1994-02-26 膨胀法长带材导体连续均匀加压工艺及其装置 Expired - Fee Related CN1066355C (zh)

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CN 93110127 CN1091357A (zh) 1993-02-27 1993-02-27 膨胀法长带材连续均压加压装置及其工艺
CN93110127.1 1993-02-27
CN94110084A CN1066355C (zh) 1993-02-27 1994-02-26 膨胀法长带材导体连续均匀加压工艺及其装置

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8806533B1 (en) 2004-10-08 2014-08-12 United Video Properties, Inc. System and method for using television information codes

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN85104876A (zh) * 1985-06-26 1987-01-07 株式会社神户制钢所 间接挤压方法和装置
SU1454729A1 (ru) * 1987-07-27 1989-01-30 Предприятие П/Я В-2190 Термоупругий пресс
CN1033585A (zh) * 1987-10-01 1989-07-05 尤罗帕·麦他尔利有限公司 制造管状半成品铜合金件的方法
CN2050353U (zh) * 1989-04-14 1990-01-03 陈忠明 热恒温扁材挤压模具
CN1068214A (zh) * 1991-06-26 1993-01-20 北京航空航天大学 制备铋系超导氧化物晶体的新方法(熔盐反应法)

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN85104876A (zh) * 1985-06-26 1987-01-07 株式会社神户制钢所 间接挤压方法和装置
SU1454729A1 (ru) * 1987-07-27 1989-01-30 Предприятие П/Я В-2190 Термоупругий пресс
CN1033585A (zh) * 1987-10-01 1989-07-05 尤罗帕·麦他尔利有限公司 制造管状半成品铜合金件的方法
CN2050353U (zh) * 1989-04-14 1990-01-03 陈忠明 热恒温扁材挤压模具
CN1068214A (zh) * 1991-06-26 1993-01-20 北京航空航天大学 制备铋系超导氧化物晶体的新方法(熔盐反应法)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8806533B1 (en) 2004-10-08 2014-08-12 United Video Properties, Inc. System and method for using television information codes

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