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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Enhanced critical current properties of in situ processed MgB_2 wires using milled boron powder and low temperature solid-state reaction
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Enhanced critical current properties of in situ processed MgB_2 wires using milled boron powder and low temperature solid-state reaction

机译：磨碎的硼粉和低温固态反应增强了现场处理的MgB_2线的临界电流性能

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摘要

To get the fine grain structure of MgB_2 with high critical current properties, mechanical milling for as-received boron (B) powder and low temperature solid-state reaction of 550 or 600 °C were attempted to in situ powder-in-tube processed MgB_2/Fe wires. The comparisons for the phase formation, crystallinity, grain size, microstructure and superconducting properties were performed for the wires using un-milled B powder or high temperature heat-treatment of 800 °C. It was found that the MgB_2 phase formation in the wires using the milled B powder was more activated when compared to the wires using the un-milled B powder under the same heat-treatment conditions, because of the improved reactivity of the B powder after milling. The upper critical fields and critical current densities of the MgB_2 wires using the milled B powder were also enhanced due to a smaller grain size and an increased volume of the superconducting phase. In addition, the low temperature heat-treatment of 550 and 600 °C also contributed to the enhanced superconducting properties by minimizing the grain growth for an increased grain boundary pinning when compared to a conventional high temperature heat-treatment of 800 °C. The solid-state reaction of a low temperature process for the samples using the milled B powder resulted in poorer crystallinity with a smaller grain size, which improved the superconducting properties.
机译：为了获得具有高临界电流特性的MgB_2的细晶粒结构，尝试对原样的硼（B）粉末进行机械研磨，并在550或600°C的低温固态反应下原位制备管内粉末处理的MgB_2 /铁丝。使用未研磨的B粉末或800°C的高温热处理对导线进行了相形成，结晶度，晶粒度，微结构和超导性能的比较。发现在相同的热处理条件下，与使用未研磨的B粉的线材相比，使用研磨的B粉的线材中的MgB_2相形成的活化更多，这是因为研磨后B粉的反应性提高了。 。由于较小的晶粒尺寸和增加的超导相体积，使用研磨的B粉末的MgB_2导线的上部临界场和临界电流密度也得到了增强。此外，与传统的800°C高温热处理相比，550°C和600°C的低温热处理还通过最小化晶粒生长以增加晶界钉扎来增强超导性能。使用研磨后的B粉末对样品进行低温处理的固态反应导致结晶度较差且晶粒较小，从而改善了超导性能。

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