Influences of the Bi2Sr2CaCu2Ox/Ag interface and interfilamentary bridge connections on AC loss of composite wires
| Autor: | Zhao-Fei Jiang, Feng Xue, Xiaofan Gou |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Superconductivity Materials science Condensed matter physics Composite number Energy Engineering and Power Technology Condensed Matter Physics Microstructure 01 natural sciences Finite element method Electronic Optical and Magnetic Materials Magnetic field Nonlinear system Amplitude Condensed Matter::Superconductivity 0103 physical sciences Electrical and Electronic Engineering 010306 general physics Type-II superconductor |
| Zdroj: | Physica C: Superconductivity and its Applications. 547:69-76 |
| ISSN: | 0921-4534 |
| Popis: | The microstructure of Bi2Sr2CaCu2Ox (Bi2212) filamentary composite round wires (RWs) changes to be extremely complicated after heat treatment, with the interface between Bi2212 filaments and Ag matrix being meandering and a lot of bridge connections (BCs) generating between filaments. The influence of such the unique microstructure on the electromagnetic behavior and especially the AC loss has not been far from completely understanding. In this paper, according to the H formulation and on the nonlinear E–J relationship, we developed a finite element model, and further on this model evaluated the current and AC loss of a Bi2212 multifilamentary wire with the rough Bi2212/Ag interface and several BCs between filaments under the alternating magnetic field (Hex(t) = H0sin2πft). Through the comparative study, we found that the penetration magnetic field Hp is a critical turning point and on this base the influences of such the complex microstructure are quite different when the amplitude of applied magnetic field H0 Hp. The rough interface impacts the current distribution and causes the local heat concentrated at the concave locations. For BCs between Bi2212 filaments, it is most significant that they can share the current and make the current redistribute between filaments. Further for the wire with various types of BCs, the current distribution and the AC loss relative to the wire without BCs ( Q / Q mag no BCs ) were comprehensively investigated. |
| Databáze: | OpenAIRE |
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