arXiv 0912.48992009-12-24cond-mat.supr-concond-mat.mtrl-sci

用于故障限流器和低温电机的纳米结构超导材料

Nanostructural Superconducting Materials for Fault Current Limiters and Cryogenic Electrical Machines

T. A. Prikhna, W. Gawalek, Ya. M. Savchuk, N. V. Sergienko, V. E. Moshchil, V. Sokolovsky, J. Vajda, V. N. Tkach, F. Karau, H. Weber, M. Eisterer, A. Juolain, J… 展开作者

T. A. Prikhna, W. Gawalek, Ya. M. Savchuk, N. V. Sergienko, V. E. Moshchil, V. Sokolovsky, J. Vajda, V. N. Tkach, F. Karau, H. Weber, M. Eisterer, A. Juolain, J. Rabier, X. Chaud, M. Wendt, J. Dellith, N. I. Danilenko, T. Habisreuther, S. N. Dub, V. Meerovich, D. Litzkendorf, P. A. Nagorny, L. K. Kovalev, Ch. Schmidt, V. S. Melnikov, A. P. Shapovalov, A. V. Kozyrev, V. B. Sverdun, J. Kosa, A. V. Vlasenko

备注：: 26 pages, 9 figues, 1 tables, presented at OMEE-2009, accepted for Acta Physica Polonica A

阅读 PDF

arXiv 页面 ↗HTML 原文 ↗

摘要：

Y-Ba-Cu-O材料（熔融织构的YBa 2Cu 3 O 7-d基材料或MT-YBCO）和Mg-B-O具有高超导性能的（MgB 2基材料）系统可以有效地用于低温技术中，特别是用于故障电流限制器和电机中，所述高超导性能可以由于在其结构中形成规则分布的纳米结构缺陷和不均匀性而获得（电动机、发电机、液化气泵等）。高温（900-800 ℃）氧化的MT-YBCO和高压（2 GPa）的MgB 2基材料的高压合成工艺的发展，使我们能够获得高SC（临界电流密度，上临界场，不可逆场，捕获磁场）和机械（硬度，断裂韧性，杨氏模量）特性。结果表明，MT-YBCO的材料性能改善是由于形成了高密度的孪晶（20-22微米-1），防止裂纹和减少（4.5倍）的微裂纹密度，而在MgB 2基材料的情况下，由于形成了与基体相相比富氧的细分散Mg-B-O不均匀性以及在Mg-B-O基体中具有接近MgB 12化学计量比的较高硼化物的夹杂物（具有15-37 nm的平均晶粒尺寸）。的可能性，以获得相当高的Tc（37 K）和临界电流密度的材料与MgB 12矩阵（与95%的屏蔽分数从电阻曲线计算）。

英文摘要：

Materials of the Y-Ba-Cu-O (melt-textured YBa2Cu3O7-d-based materials or MT-YBCO) and Mg-B-O (MgB2-based materials) systems with high superconducting performance, which can be attained due to the formation of regularly distributed nanostructural defects and inhomogenities in their structure can be effectively used in cryogenic technique, in particular in fault current limiters and electrical machines (electromotors, generators, pumps for liquid gases, etc.). The developed processes of high-temperature (900-800 oC) oxygenation under elevated pressure (16 MPa) of MT-YBCO and high-pressure (2 GPa) synthesis of MgB2-based materials allowed us to attain high SC (critical current densities, upper critical fields, fields of irreversibility, trapped magnetic fields) and mechanical (hardness, fracture toughness, Young modulus) characteristics. It has been shown that the effect of materials properties improvement in the case of MT-YBCO was attained due to the formation of high twin density (20-22 micron-1), prevention of macrockracking and reduction (by a factor of 4.5) of microcrack density, and in the case of MgB2-based materials due to the formation of oxygen-enriched as compared to the matrix phase fine-dispersed Mg-B-O inhomogenities as well as inclusions of higher borides with near-MgB12 stoichiometry in the Mg-B-O matrix (with 15-37 nm average grain sizes). The possibility is shown to obtain the rather high Tc (37 K) and critical current densities in materials with MgB12 matrix (with 95 percent of shielding fraction as calculated from the resistant curve).

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。