公开(公告)号：US07722918B2

公开(公告)日：2010-05-25

申请号：US11506967

申请日：2006-08-17

申请人： Shrikant Narayan Ekbote ,  Gursharan Kaur Padam ,  Narinder Kumar Arora ,  Mukul Sharma ,  Ramesh Kumar Sethi ,  Mrinal Kanti Banerjee

发明人： Shrikant Narayan Ekbote ,  Gursharan Kaur Padam ,  Narinder Kumar Arora ,  Mukul Sharma ,  Ramesh Kumar Sethi ,  Mrinal Kanti Banerjee

IPC分类号： B05D5/12 ,  C04B35/45

CPC分类号： H01L39/2419 ,  H01L39/143

摘要： The present invention provides a process for the preparation of high temperature superconducting (HTS) bulk current leads capable of supplying a continuous current of more than 200 A at 77 K, at least for 2 to 4 hours without any substantial heat load to cryogen free cryocooler and other superconducting magnet systems. The superconducting bulk current leads with improved properties are prepared from an improved high temperature superconducting (HTS) bismuth based cuperate [(Bi, Pb)2Sr2Ca2Cu3O10+x] material in tube and rod shape with both end metallic contacts. To produce such a lead, the process included modification of the superconducting material with homogeneous silver addition, a step of initial sintering in a large size tube followed by crushing into powder, a step of shaping the said initially sintered tube powder into tubes and rods of different size, a step of formation of metallic contacts by a perforated silver foil sandwiched between two metal spray deposited silver at both end parts of the said tubes and rods followed by a final step of co-sintering. In the current leads obtained according to these aspects, it is possible to stably carry current more than 200 A required for energizing superconducting magnet systems.

摘要翻译： 本发明提供了一种制备高温超导（HTS）体电流引线的方法，其能够在77K下至少提供大于200A的连续电流，至少2至4小时，而对无冷冻剂的低温冷却器没有任何实质的热负荷 和其他超导磁体系统。 具有改进性能的超导体电流引线由具有两端金属触点的管和棒形状的改进的高温超导（HTS）铋基铜酸盐[（Bi，Pb）2Sr 2 Ca 2 Cu 3 O 10 + x]材料制备。 为了制造这种铅，该方法包括用均匀的银添加改性超导材料，在大尺寸管中初始烧结，然后粉碎成粉末的步骤，将所述初始烧结的管粉末成形为管和棒的步骤 不同尺寸，通过夹在两个金属喷涂沉积银之间的穿孔银箔形成金属接触的步骤，两个金属喷涂沉积的银在所述管和棒的两端部分之后是最后的共烧结步骤。 在根据这些方面获得的电流引线中，可以稳定地承载超导磁体系统激励所需的电流大于200A。

公开(公告)号：US08530389B2

公开(公告)日：2013-09-10

申请号：US12290581

申请日：2008-10-31

申请人： Narinder Kumar Arora ,  Gursharan Kaur Padam ,  Ramesh Sethi ,  Mukul Sharma ,  Shrikant Narayan Ekbote

发明人： Narinder Kumar Arora ,  Gursharan Kaur Padam ,  Ramesh Sethi ,  Mukul Sharma ,  Shrikant Narayan Ekbote

IPC分类号： H01L39/24 ,  H01B12/00

CPC分类号： H01L39/2419

摘要： An improved process for the preparation of oxide superconducting rods. The present invention provides a process for the preparation of oxide superconducting rods. The process includes the steps of a cold isopressing process without addition of binder, particularly thin and those based on Ag-added (Bi,Pb)2 Sr2 Ca2 Cu3 O10+x is disclosed. The main features of the process are the packing of partially preformed oxide superconducting powder obtained from spray drying a nitrate solution of Bi,Pb,Sr,Ca,Cu and Ag in a flexible rubber mould wrapped with a perforated metal sheet and whose inner surface is coated with olive oil, evacuating the packed partially preformed powder to remove trapped air and thereby reduces the defects and improves the subsequent cold isopressing to form rods; immediate cleaning the surface of the said rods so that no trace of olive oil is left; sintering initially the said rod in a silver tube/alumina sager, making silver metal contacts at both ends of the initially sintered rod; finally sintering the assembly of the said rod and both end silver metal contacts. The rods obtained according to these aspects show desired and consistent values of transport current not less than 36 Amp, contact resistance not more than 0.015 μOhm-cm2 at 77K in self field and fracture strength not less than 140 MPa.

公开(公告)号：US20090192043A1

公开(公告)日：2009-07-30

申请号：US12290581

申请日：2008-10-31

申请人： Narinder Kumar Arora ,  Gursharan Kaur Padam ,  Ramesh Sethi ,  Mukul Sharma ,  Shrikant Narayan Ekbote

发明人： Narinder Kumar Arora ,  Gursharan Kaur Padam ,  Ramesh Sethi ,  Mukul Sharma ,  Shrikant Narayan Ekbote

IPC分类号： H01L39/24

CPC分类号： H01L39/2419

摘要： An improved process for the preparation of oxide superconducting rods. The present invention provides a process for the preparation of oxide superconducting rods. The process includes the steps of a cold isopressing process without addition of binder, particularly thin and those based on Ag-added (Bi,Pb)2 Sr2 Ca2 Cu3 O10+x is disclosed. The main features of the process are the packing of partially preformed oxide superconducting powder obtained from spray drying a nitrate solution of Bi,Pb,Sr,Ca,Cu and Ag in a flexible rubber mould wrapped with a perforated metal sheet and whose inner surface is coated with olive oil, evacuating the packed partially preformed powder to remove trapped air and thereby reduces the defects and improves the subsequent cold isopressing to form rods; immediate cleaning the surface of the said rods so that no trace of olive oil is left; sintering initially the said rod in a silver tube/alumina sager, making silver metal contacts at both ends of the initially sintered rod; finally sintering the assembly of the said rod and both end silver metal contacts. The rods obtained according to these aspects show desired and consistent values of transport current not less than 36 Amp, contact resistance not more than 0.015 μOhm-cm2 at 77K in self field and fracture strength not less than 140 MPa.

摘要翻译： 一种用于制备氧化物超导棒的改进方法。 本发明提供一种制备氧化物超导棒的方法。 该方法包括没有添加粘合剂，特别薄的冷等压处理步骤，以及基于添加Ag（Bi，Pb）2 Sr 2 Ca 2 Cu 3 O 10 + x的那些。 该方法的主要特征是将由Bi，Pb，Sr，Ca，Cu和Ag的硝酸盐溶液喷雾干燥得到的部分预制氧化物超导粉末填充在用穿孔金属片包裹的柔性橡胶模中，其内表面为 涂上橄榄油，排空填充的部分预制粉末以除去被捕获的空气，从而减少缺陷，并改进后续的冷等压成型棒; 立即清洁所述杆的表面，使得不留下痕迹的橄榄油; 首先在银管/氧化铝锯床中烧结所述棒，使银金属在初始烧结棒的两端接触; 最后烧结所述棒和两端银金属接触件的组件。 根据这些方面获得的棒显示不小于36安培的输送电流的期望和一致的值，在自身77K处的接触电阻不大于0.015μΩ·cm -2，断裂强度不小于140MPa。

公开(公告)号：US20100009855A1

公开(公告)日：2010-01-14

申请号：US12525026

申请日：2007-12-31

申请人： Shrikant Narayan Ekbote ,  Gursharan Kaur Padam ,  Narendra Kumar Arora ,  Mukul Sharma ,  Ramesh Sethi

发明人： Shrikant Narayan Ekbote ,  Gursharan Kaur Padam ,  Narendra Kumar Arora ,  Mukul Sharma ,  Ramesh Sethi

IPC分类号： H01L39/24

CPC分类号： H01L39/2419 ,  H01L39/02

摘要： The present invention provides a process for joining oxide-superconducting tubes with a superconducting joint. The process involves the preparation of a partially preformed superconducting material, followed by cold isopressing of the powder of partially performed superconducting material into tube shape and further provided with grooves at both ends of the tubes with a subsequent deposition of a silver layer. The process further involves the lapping of one of the end faces of a pair of said tubes to be joined. These lapped end faces of both the tubes clubbed together on a common silver bush are coated with a paste of the same partially preformed superconducting material in organic formulation. Then these coated end faces are closed pressed together to form a joint. This joint portion and the end portions of the tubes are wrapped with a perforated silver foil followed by deposition of another layer of silver. Finally, the assembly of this joint portion and the pair of tubes is heat treated in air for 100 to 150 hours and at temperatures from 830° to 850° C. The joint made according to this process is able to stably carry not less than 80% of the transport current of the high temperature superconducting tubes.

摘要翻译： 本发明提供了一种用超导接头连接氧化物超导管的方法。 该方法包括制备部分预制的超导材料，然后将部分执行的超导材料的粉末冷挤压成管形，并在管的两端进一步设置有凹槽，随后沉积银层。 该方法还涉及研磨一对待连接的管的一个端面。 两个管子的共同的顶面在共同的银衬套上共同铺在同一部分预制的超导材料的有机配方中。 然后将这些涂覆的端面封闭在一起形成接头。 该接合部分和管的端部用穿孔银箔包裹，然后沉积另一层银。 最后，将该接头部分和一对管的组装在空气中热处理100至150小时，并在830℃至850℃的温度下进行。根据该方法制成的接头能够稳定地承载不少于80 高温超导管输送电流的百分比。

公开(公告)号：US08304372B2

公开(公告)日：2012-11-06

申请号：US12525026

申请日：2007-12-31

申请人： Shrikant Narayan Ekbote ,  Gursharan Kaur Padam ,  Narendra Kumar Arora ,  Mukul Sharma ,  Ramesh Sethi

发明人： Shrikant Narayan Ekbote ,  Gursharan Kaur Padam ,  Narendra Kumar Arora ,  Mukul Sharma ,  Ramesh Sethi

IPC分类号： H01L39/24 ,  H01L39/02 ,  H01R4/00

CPC分类号： H01L39/2419 ,  H01L39/02

摘要： The present invention provides a process for joining oxide-superconducting tubes with a superconducting joint. The process involves the preparation of a partially preformed superconducting material, followed by cold isopressing of the powder of partially performed superconducting material into tube shape and further provided with grooves at both ends of the tubes with a subsequent deposition of a silver layer. The process further involves the lapping of one of the end faces of a pair of said tubes to be joined. These lapped end faces of both the tubes clubbed together on a common silver bush are coated with a paste of the same partially preformed superconducting material in organic formulation. Then these coated end faces are closed pressed together to form a joint. This joint portion and the end portions of the tubes are wrapped with a perforated silver foil followed by deposition of another layer of silver. Finally, the assembly of this joint portion and the pair of tubes is heat treated in air for 100 to 150 hours and at temperatures from 830° to 850° C. The joint made according to this process is able to stably carry not less than 80% of the transport current of the high temperature superconducting tubes.

摘要翻译： 本发明提供了一种用超导接头连接氧化物超导管的方法。 该方法包括制备部分预制的超导材料，然后将部分执行的超导材料的粉末冷挤压成管形，并在管的两端进一步设置有凹槽，随后沉积银层。 该方法还涉及研磨一对待连接的管的一个端面。 两个管子的共同的顶面在共同的银衬套上共同铺在同一部分预制的超导材料的有机配方中。 然后将这些涂覆的端面封闭在一起形成接头。 该接合部分和管的端部用穿孔银箔包裹，然后沉积另一层银。 最后，将该接头部分和一对管的组装在空气中热处理100至150小时，并在830℃至850℃的温度下进行。根据该方法制成的接头能够稳定地承载不少于80 高温超导管输送电流的百分比。

公开(公告)号：US08306590B2

公开(公告)日：2012-11-06

申请号：US12842255

申请日：2010-07-23

申请人： Shrikant Ekbote ,  Gursharan Kaur Padam ,  Narendra Kumar Arora ,  Mukul Sharma ,  Ramesh Sethi ,  Mrinal Kanti Banerjee

发明人： Shrikant Ekbote ,  Gursharan Kaur Padam ,  Narendra Kumar Arora ,  Mukul Sharma ,  Ramesh Sethi ,  Mrinal Kanti Banerjee

IPC分类号： H01L39/24 ,  H01R4/68 ,  H01B12/00

CPC分类号： H01L39/2474 ,  Y10S505/706 ,  Y10T29/49014 ,  Y10T29/49204

摘要： Disclosed is a three layer process for making contact points to a high transition temperature superconductor (HTSC), particularly to (Bi,Pb)2 Sr2 Ca2 CU3019+x with and without silver in the superconductor. The contact structure is a three layer configuration with a perforated silver foil (3) sandwiched between two metal spray gun deposited silver layers (2,5) and subsequent heat treatment in air. The contact has been made on tubes and rods (1). The silver contacts are capable of carrying a continuous current of 200 Amps without adding any substantial heat load to the cryogen used to cool the HTSC. The contact resistance at 4.2 K is in the range of 1.5×10 (hoch−8) to 8.5″ 10 (hoch−8) OHM in zero applied filed.

摘要翻译： 公开了一种用于与高转变温度超导体（HTSC）形成接触点的三层工艺，特别是在超导体中具有和不具有银的（Bi，Pb）2 Sr2 Ca2 CU3019 + x。 接触结构是三层结构，其中穿过的银箔（3）夹在两个金属喷枪沉积的银层（2,5）之间，随后在空气中进行热处理。 在管和杆（1）上进行接触。 银触点能够承载200安培的连续电流，而不会对用于冷却HTSC的冷冻剂增加任何实质的热负荷。 4.2K的接触电阻在零施加的场合中在1.5×10（hoch-8）至8.5“10（hoch-8）OHM的范围内。

公开(公告)号：US07792560B2

公开(公告)日：2010-09-07

申请号：US10594018

申请日：2004-03-31

申请人： Shrikant Ekbote ,  Gursharan Kaur Padam ,  Narendra Kumar Arora ,  Mukul Sharma ,  Ramesh Sethi ,  Mrinal Kanti Banerjee

发明人： Shrikant Ekbote ,  Gursharan Kaur Padam ,  Narendra Kumar Arora ,  Mukul Sharma ,  Ramesh Sethi ,  Mrinal Kanti Banerjee

IPC分类号： H01B12/00 ,  H01L39/24 ,  H01R4/68 ,  B05D5/12

CPC分类号： H01L39/2474 ,  Y10S505/706 ,  Y10T29/49014 ,  Y10T29/49204

摘要： Disclosed is a three layer process for making contact points to a high transition temperature superconductor (HTSC), particularly to (Bi,Pb)2Sr2Ca2Cu3O19+x with and without silver in the superconductor. The contact structure is a three layer configuration with a perforated silver foil (3) sandwiched between two metal spray gun deposited silver layers (2,5) and subsequent heat treatment in air. The contact has been made on tubes and rods (1). The silver contacts are capable of carrying a continuous current of 200 Amps without adding any substantial heat load to the cryogen used to cool the HTSC. The contact resistance at 4.2 K is in the range of 1.5×10 (hoch−8) to 8.5″ 10 (hoch−8)OHM in zero applied filed.

摘要翻译： 公开了一种用于与高转变温度超导体（HTSC）形成接触点的三层工艺，特别是在超导体中具有和不具有银的（Bi，Pb）2Sr2Ca2Cu3O19 + x。 接触结构是三层结构，其中穿过的银箔（3）夹在两个金属喷枪沉积的银层（2,5）之间，随后在空气中进行热处理。 在管和杆（1）上进行接触。 银触点能够承载200安培的连续电流，而不会对用于冷却HTSC的冷冻剂增加任何实质的热负荷。 4.2K的接触电阻在零施加的场合中在1.5×10（hoch-8）至8.5“10（hoch-8）OHM的范围内。