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Processing of textured superconductors with a continuous laser furnace

AutorLennikov, V.; Amaveda, H.; Mora Alfonso, Mario; Angurel, Luis A.; Fuente, Germán F. de la
Fecha de publicación2012
CitaciónICMS 2012
ResumenTexture control in oxide superconductors has been studied intensively since the discovery of High temperature superconductivity. Efforts to induce texture with laser heating have been widely published in the literature, using systems, which usually made no use of external heating to avoid microcrack formation due to excessive thermal stress around the laser incidence area. The typical cylindrical geometry, most often used in Laser Float Zone Melting (LFZ) hindered the development of appropriate heating devices, thus efforts were launched in order to design a Laser Zone Melting system where the effect of external heating of the superconductor could be ascertained in order to obtain textured superconducting material in planar geometries. A number of papers have thus appeared in the literature based on Laser Zone Melting of Bi-2212. Recently, the method has been improved with the use of a patented continuous Laser Furnace, which will be described here. Combination of colloidal processing and continuous Laser Furnace has been used to fabricate superconducting coatings on different ceramics substrates. In particular we will present results about the optimization of colloidal processing of Bi-2212, RE-123, RE-211 and Cu5Ba3O8 green tapes as well as BaZrO3 substrates. Surface modification of the substrates and texture of the superconducting materials have been reached using a continuous Laser Furnace. The effects of the laser parameters and the temperature of the furnace on the microstructure and physical properties of the samples are also presented. Results show the potential of these processing techniques in the controlled modification of the microstructure and properties of different ceramic materials.
DescripciónResumen del trabajo presentado a la: "3rd International Conference on Superconductivity and Magnetism" celebrada en Estambul (Turquia) del 29 de abril al 4 de mayo de 2012.
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