Bi-2212导体用铠甲的性能研究

发布时间：2018-03-19 17:16

  本文选题：超导　切入点：Bi-2212　出处：《中国科学技术大学》2017年硕士论文　论文类型：学位论文

【摘要】：我国能源储备虽然丰富,但是人均占有量十分有限,而且以煤炭资源为主要应用,核能则有待开发中。介于目前的低碳环保热潮,十分清洁的聚变能源一直是人类梦寐以求的梦想。目前我们已经在聚变上有了一些时间和探索,如ITER(International Thermonuclear Experimental Reactor)、EAST(Experimental Advanced Superconducting Tokamak)等。但是,未来 DEMO、商用堆对超导磁体磁场强度、和维持时间提出更高的要求(功率2GW,磁场15T,电流100kA,承载150吨/米)。可是受低温超导线材上临界磁场的限制,很难制备出超过20T的磁体而而高温超导材料有着优异的上临界场、大的临界电流密度。是我们以后的发展方向。在高温超导材料中,Bi2Sr2CaCu2Ox(Bi-2212)超导材料在4.2K具有优异的Jc-B特性;可制备成圆线,适合绞缆。作为一个圆线导体,Bi-2212可以制成多种高电流的电缆。基于材料制备进步,Bi-2212已开始用于卢瑟福电缆、CICC导体绞制,进而用于高场内插磁体、储能磁体、加速器磁体以及聚变磁体的研制,同时也是目前制备高温超导CICC导体的首选材料。CICC(Calbe-In-Conduit Conducters),又称铠装电缆导体,是有超导股线通过多级扭绞成为超导电缆,再将超导电缆穿入不锈钢管(铠甲),通过紧压技术成型为超导导体。特点是具有良好的自支撑、较低的交流损耗、所需低温介质少、运行安全可靠、性能高等,是目前国际上公认的受控热核巨变装置中的大型超导磁体、大型超导储能磁体等装置的首选导体,被应用于各种大型科学装置中。而本文的重点就是关于Bi-2212 CICC导体铠甲的相关性能研究。目前,国内外还没有关于Bi-2212CICC导体的相关研究,但是在进行Bi-2212卢瑟福电缆的研究中,研究人员发现了一些金属材料与Bi-2212超导线反应的规律。在之前的卢瑟福电缆的研究中,人们用金属材料作为电缆线与Bi-2212超导线扭绞在一起来观察其与Bi-2212的反应,但有些材料由于成本原因,并不适合作为我们CICC导体的铠甲材料。目前,对这些金属材料缺乏系统的研究。Bi-2212 CICC导体铠甲材料的具体要求:在890℃高温热处理时氧气可以通过,且不与bi2212导体发生化学反应。在室温和低温下均具有良好的力学性能。对此我们将展开一系列研究,目前我们选用的主要是316LN和Ni-80Cr两种金属材料。为此,我们利用有限元软件进行了力学性能分析,模拟了整根导体在高压、高温热处理时的受力情况。进而我们对两种铠甲材料进行了化学成分分析、力学性能研究、扫描电镜分析,以及将其与Bi-2212超导线一起进行热处理,以观察铠甲材料与超导线的反应情况。在未来,Bi-2212CICC导体将要应用在高场环境下(1000KN),Ni-80Cr可能承受不了如此压力,因此,综合考虑,我们将采用复合管铠甲。
[Abstract]:Although our country is rich in energy reserves, its per capita share is very limited, and its main application is coal resources, while nuclear energy is yet to be developed. Very clean fusion energy has always been the dream of mankind. At present, we have some time and exploration in fusion, such as ITER(International Thermonuclear Experimental Reactor.However, in the future, Demo, commercial reactors will have the strength of superconducting magnets. Higher requirements for maintenance time (power 2GW, magnetic field 15T, current 100kA, carrying 150 t / m). However, due to the limit of the critical magnetic field on the cryogenic superconducting wire, it is difficult to produce magnets over 20T and the high-temperature superconducting material has an excellent supercritical field. High critical current density is our future development direction. Bi2Sr2CaCu2OxBi-2212) superconducting materials have excellent Jc-B properties at 4.2 K and can be fabricated into circular wires. Suitable for twisted cables. As a round wire conductor Bi-2212 can be made into a variety of high-current cables. Based on material fabrication progress, Bi-2212 has been used in Rutherford cable, CICC conductor strangulation, and then used in high-field intercalated magnets, energy storage magnets, The development of accelerator magnets and fusion magnets is also the preferred material for the preparation of high temperature superconducting CICC conductors. CICCU Calbe-In-Conduit conductors, also known as sheathed cable conductors, have superconducting strands through multistage twisting to form superconducting cables. The superconducting cable is then penetrated into the stainless steel tube (armour) and formed into a superconducting conductor by compaction technique. It is characterized by good self-supporting, low AC loss, less low temperature medium required, safe and reliable operation, high performance, etc. It is the first choice conductor of large superconducting magnets and large superconducting energy storage magnets in controlled thermonuclear giant change devices. This paper focuses on the research on the properties of Bi-2212CICC conductor armor. At present, there is no research on Bi-2212CICC conductor at home and abroad, but in the research of Bi-2212 Rutherford cable, Researchers have discovered how metal materials react to Bi-2212 superconductors. In previous Rutherford cable studies, metal materials were used as cables to twisting Bi-2212 wires to observe their reaction to Bi-2212. But some materials are not suitable for our CICC conductor for cost reasons. At present, there is no systematic research on these metal materials. Bi-2212 CICC conductor armor material: oxygen can pass through at 890 鈩，

本文编号：1635233