采用管内粉末（PIT）技术制备的多丝MgB导线中，织构化纳米纤维结构具有高临界电流密度。

High Critical Current Density in the Textured Nanofiber Structure in Multifilament MgB Wires Made by the Powder-In-Tube (PIT) Technique.

作者信息

Gajda Daniel, Zaleski Andrzej J, Morawski Andrzej J, Małecka Małgorzata, Tran Lan Maria, Rindfleisch Matt, Durejko Tomasz, Czujko Tomasz

机构信息

Institute of Low Temperature and Structure Research PAS, Okolna 2, 50-422 Wroclaw, Poland.

Institute of High Pressure Physics PAS, Sokolowska 29/37, 01-142 Warsaw, Poland.

出版信息

Materials (Basel). 2022 Aug 5;15(15):5419. doi: 10.3390/ma15155419.

DOI:10.3390/ma15155419

PMID:35955352

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9369698/

Abstract

We show that the structure of multifilament MgB wires made by the powder-in-tube (PIT) method can be texturized by annealing the structure under high isostatic pressure. Our results show that we obtained continuous fibers with a uniform diameter of 250 nm in all 36 filaments, a small grain size of approximately 50 nm and a high density of the superconducting material. These results contribute to a significant improvement in the critical current density in high magnetic fields, e.g., 100 A/mm at 14 T and 4.2 K.

摘要

我们表明，通过在高静水压力下对结构进行退火处理，采用管内粉末（PIT）法制造的多丝MgB线的结构可以实现织构化。我们的结果表明，我们在所有36根细丝中均获得了直径均匀为250 nm的连续纤维、约50 nm的小晶粒尺寸以及高密度的超导材料。这些结果有助于显著提高高磁场下的临界电流密度，例如在14 T和4.2 K时达到100 A/mm² 。