發(fā)布時(shí)間：2018-03-31 19:38

  本文選題：YBCO涂層導(dǎo)體　切入點(diǎn)：低氟MOD法　出處：《電子科技大學(xué)》2011年碩士論文

【摘要】：由于YBa2Cu3O7-x(YBCO)涂層導(dǎo)體在性價(jià)比以及電學(xué)性能等方面具有Bi系高溫超導(dǎo)帶材所無(wú)法比擬的優(yōu)勢(shì),因而在強(qiáng)電領(lǐng)域?qū)⒂兄訌V闊的商業(yè)應(yīng)用前景。在眾多制備YBCO涂層導(dǎo)體的方法中,金屬有機(jī)沉積(MOD)法具有無(wú)需真空系統(tǒng)、可精確控制前驅(qū)液成分以及便于大面積沉積等優(yōu)點(diǎn),是低成本、大規(guī)模制備YBCO涂層導(dǎo)體的首選方法。本論文基于低氟MOD法在沉積有Y_2O_3/YSZ/CeO_2 (YYC)緩沖層的金屬基帶表面開展了YBCO超導(dǎo)薄膜制備工藝的研究。 采用環(huán)烷酸銅取代三氟乙酸銅制備了低氟含量的前驅(qū)液,通過(guò)研究前驅(qū)液溶質(zhì)在多種常用溶劑中的溶解情況確定了合適的溶劑,同時(shí)研究所得前驅(qū)液的穩(wěn)定性發(fā)現(xiàn)采用四氫呋喃作溶劑制備的前驅(qū)液在室溫下、純氮?dú)猸h(huán)境中可穩(wěn)定保存30天。隨后系統(tǒng)地研究了低氟MOD法低溫?zé)崽幚磉^(guò)程中升溫速率對(duì)前驅(qū)膜表面形貌以及YBCO薄膜微觀結(jié)構(gòu)和表面形貌的影響。 另外開展了低氟MOD法高溫?zé)崽幚砉に噷?duì)YBCO薄膜的影響研究,通過(guò)優(yōu)化各種工藝參數(shù)(處理溫度、氧分壓以及單層膜厚度),在較優(yōu)的工藝參數(shù)下得到純c軸取向、面內(nèi)外半高寬分別為4.6°和1.4°的YBCO超導(dǎo)薄膜,在77K、自場(chǎng)條件下測(cè)得其臨界電流密度以及臨界電流分別為0.4MA/cm2和40A/cm-width。同時(shí)在低氟MOD法制備YBCO薄膜過(guò)程中發(fā)現(xiàn),BaCeO_3的形成與緩沖層中CeO_2的表面形貌有關(guān),CeO_2的表面晶粒大小和表面均方根粗糙度較大都會(huì)導(dǎo)致大量的BaCeO_3生成,從而影響YBCO薄膜的外延生長(zhǎng);通過(guò)在高溫?zé)崽幚斫Y(jié)束時(shí)添加高溫氧化退火過(guò)程,可大幅減少YBCO薄膜中YBa_2Cu_4_O8(Y124)相缺陷的含量。
[Abstract]:Because YBA _ 2Cu _ 3O _ 7-x YBCO) coated conductors have more advantages than Bi-based HTS tapes in cost performance and electrical properties, YBA _ 2Cu _ 3O _ (7-x) coated conductors will have a wider commercial application prospect in the field of strong electricity. The metal-organic deposition (MOD) method has the advantages of no vacuum system, accurate control of precursor composition and convenience for large area deposition. In this thesis, the preparation of YBCO superconducting thin films on the surface of metal substrate deposited with Y_2O_3/YSZ/CeO_2 YYC buffer layer has been carried out based on the low fluorine MOD method. The precursor solution with low fluorine content was prepared by replacing copper naphthenate with copper trifluoroacetate. The suitable solvent was determined by studying the dissolution of solute in various common solvents. At the same time, the stability of the precursor was studied. It was found that the precursor prepared by using tetrahydrofuran as solvent was prepared at room temperature. The effect of heating rate on the surface morphology of precursor film, microstructure and surface morphology of YBCO film during low temperature heat treatment by low fluorine MOD method was systematically studied. In addition, the effect of high temperature heat treatment of low fluorine MOD process on YBCO thin films was studied. By optimizing various process parameters (treatment temperature, oxygen partial pressure and thickness of monolayer films), the pure c-axis orientation was obtained under better technological parameters. The YBCO superconducting thin films with in and out of plane half-width of 4.6 擄and 1.4 擄, respectively, At 77K, the critical current density and critical current were determined to be 0.4MA/cm2 and 40A / cm-width. meanwhile, it was found that the formation of BaCeO3 was related to the surface morphology of CeO_2 in buffer layer during the preparation of YBCO thin films by low-fluorine MOD method. And the larger root-mean-square roughness of the surface leads to a large amount of BaCeO_3 generation, By adding high temperature oxidation annealing process at the end of high temperature heat treatment, the content of YBA _ 2Cu _ 4O _ (8) O _ (124) phase defects in YBCO thin films can be greatly reduced.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類號(hào)】：TM26

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本文編號(hào)：1692192