Processing of Polymer-Derived High Tc Superconducting Thin Films and Coatings

该项目涉及一种利用聚合物前驱体作为涂层介质来合成高T_c氧化物超导体薄膜和涂层的新的、有前途的方法。它是一种极其灵活的涂覆工艺，最终适用于广泛的应用，包括连续线材和带状输送介质。在La2-xSrxCuO4和YBa2Cu3O7-x系统中的初步结果表明，通过这种技术可以获得良好的微结构，包括完全致密的、晶粒度可控的薄膜。有了合适的衬底，可以实现可控织构的薄膜和涂层。这项研究将表征在各种陶瓷和金属衬底上合成的YBa2Cu3O7-x涂层的工艺参数、微观结构和超导性能之间的相互关系。我们将考察正负属性的影响。将使用电子显微镜技术(透射电子显微镜、扫描电子显微镜)进行微观结构和微化学表征。将在涂层上进行临界温度、电流、磁场及其应变容限的测量。

The project is concerned with a new and promising route to the synthesis of films and coatings of high Tc oxide superconductors, which utilizes a polymer precursor as a coating medium. It is an extremely flexible coating process ultimately adaptable to a broad range of applications, including continuous wire and ribbon transport media. Initial results in the La2-xSrxCuO4 and YBa2CU3O7-x systems indicate that superior microstructures are possible by this technique including fully dense, controlled-grain size films. With proper substrates, controlled-texture films and coating may be achievable. The research will characterize the interrelationship between processing parameters, microstructure obtained, and the superconducting properties of YBa2CU3O7-x coatings synthesized on a variety of ceramic and metallic substrates. The influence of positive and negative properties will be examined. Electron microscope techniques (TEM, STEM) will be used for microstructural and microchemical characterization. Measurements of critical temperature, current, field and their strain tolerance will be conducted on the coatings.