本文選題：超導(dǎo)　切入點(diǎn)：Bi-2212　出處：《中國科學(xué)技術(shù)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：我國能源儲備雖然豐富,但是人均占有量十分有限,而且以煤炭資源為主要應(yīng)用,核能則有待開發(fā)中。介于目前的低碳環(huán)保熱潮,十分清潔的聚變能源一直是人類夢寐以求的夢想。目前我們已經(jīng)在聚變上有了一些時間和探索,如ITER(International Thermonuclear Experimental Reactor)、EAST(Experimental Advanced Superconducting Tokamak)等。但是,未來 DEMO、商用堆對超導(dǎo)磁體磁場強(qiáng)度、和維持時間提出更高的要求(功率2GW,磁場15T,電流100kA,承載150噸/米)�？墒鞘艿蜏爻瑢�(dǎo)線材上臨界磁場的限制,很難制備出超過20T的磁體而而高溫超導(dǎo)材料有著優(yōu)異的上臨界場、大的臨界電流密度。是我們以后的發(fā)展方向。在高溫超導(dǎo)材料中,Bi2Sr2CaCu2Ox(Bi-2212)超導(dǎo)材料在4.2K具有優(yōu)異的Jc-B特性;可制備成圓線,適合絞纜。作為一個圓線導(dǎo)體,Bi-2212可以制成多種高電流的電纜�；诓牧现苽溥M(jìn)步,Bi-2212已開始用于盧瑟福電纜、CICC導(dǎo)體絞制,進(jìn)而用于高場內(nèi)插磁體、儲能磁體、加速器磁體以及聚變磁體的研制,同時也是目前制備高溫超導(dǎo)CICC導(dǎo)體的首選材料。CICC(Calbe-In-Conduit Conducters),又稱鎧裝電纜導(dǎo)體,是有超導(dǎo)股線通過多級扭絞成為超導(dǎo)電纜,再將超導(dǎo)電纜穿入不銹鋼管(鎧甲),通過緊壓技術(shù)成型為超導(dǎo)導(dǎo)體。特點(diǎn)是具有良好的自支撐、較低的交流損耗、所需低溫介質(zhì)少、運(yùn)行安全可靠、性能高等,是目前國際上公認(rèn)的受控?zé)岷司拮冄b置中的大型超導(dǎo)磁體、大型超導(dǎo)儲能磁體等裝置的首選導(dǎo)體,被應(yīng)用于各種大型科學(xué)裝置中。而本文的重點(diǎn)就是關(guān)于Bi-2212 CICC導(dǎo)體鎧甲的相關(guān)性能研究。目前,國內(nèi)外還沒有關(guān)于Bi-2212CICC導(dǎo)體的相關(guān)研究,但是在進(jìn)行Bi-2212盧瑟福電纜的研究中,研究人員發(fā)現(xiàn)了一些金屬材料與Bi-2212超導(dǎo)線反應(yīng)的規(guī)律。在之前的盧瑟福電纜的研究中,人們用金屬材料作為電纜線與Bi-2212超導(dǎo)線扭絞在一起來觀察其與Bi-2212的反應(yīng),但有些材料由于成本原因,并不適合作為我們CICC導(dǎo)體的鎧甲材料。目前,對這些金屬材料缺乏系統(tǒng)的研究。Bi-2212 CICC導(dǎo)體鎧甲材料的具體要求:在890℃高溫?zé)崽幚頃r氧氣可以通過,且不與bi2212導(dǎo)體發(fā)生化學(xué)反應(yīng)。在室溫和低溫下均具有良好的力學(xué)性能。對此我們將展開一系列研究,目前我們選用的主要是316LN和Ni-80Cr兩種金屬材料。為此,我們利用有限元軟件進(jìn)行了力學(xué)性能分析,模擬了整根導(dǎo)體在高壓、高溫?zé)崽幚頃r的受力情況。進(jìn)而我們對兩種鎧甲材料進(jìn)行了化學(xué)成分分析、力學(xué)性能研究、掃描電鏡分析,以及將其與Bi-2212超導(dǎo)線一起進(jìn)行熱處理,以觀察鎧甲材料與超導(dǎo)線的反應(yīng)情況。在未來,Bi-2212CICC導(dǎo)體將要應(yīng)用在高場環(huán)境下(1000KN),Ni-80Cr可能承受不了如此壓力,因此,綜合考慮,我們將采用復(fù)合管鎧甲。
[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，

本文編號：1635233