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首页> 外文期刊>Boletin de la Sociedad Espanola de Ceramica y Vidrio >Textured Bi_2Sr_2CaCu_2O_(8+#delta#) high temperature superconductors: mechanical properties
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Textured Bi_2Sr_2CaCu_2O_(8+#delta#) high temperature superconductors: mechanical properties

机译：织构化的Bi_2Sr_2CaCu_2O_（8 +＃delta＃）高温超导体：力学性能

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摘要

The mechanical properties of Bi_2Sr_2CaCu_2O_(8+#delta#) superconductor fibres processed by laser-induced directional solidification at different growth rates were studied. Tensile and diametral compression (Brazilian test) tests were performed to analyse the longitudinal and transversal strength. The elastic modulus was determined using the flexural vibration resonance method. Flexure tests were also carried out to compare with the literature data. In addition, polished sections of the as-received fibres and the fracture surfaces of the broken samples were analysed in the scanning electron microscope. The fibres were highly anisotropic and the transverse fibre strength was very low due to the early failure by cleavage of the grains perpendicularly to the c axis. The degree of anisotropy and the longitudinal strength increased as the fibre growth rate decreased while the transverse strength followed the opposite trend. This behaviour was due to changes in the porosity and the alignment of the crystals along the fibre axis.
机译：研究了Bi_2Sr_2CaCu_2O_（8 +＃delta＃）超导纤维在不同生长速率下激光定向凝固的力学性能。进行拉伸和径向压缩（巴西测试）测试以分析纵向和横向强度。弹性模量是使用弯曲振动共振法确定的。还进行了挠曲测试以与文献数据进行比较。另外，在扫描电子显微镜中分析了接收到的纤维的抛光部分和断裂样品的断裂表面。纤维是高度各向异性的，并且由于垂直于c轴的晶粒开裂导致早期破坏，因此横向纤维强度非常低。各向异性程度和纵向强度随着纤维生长速率的降低而增加，而横向强度遵循相反的趋势。该行为是由于孔隙率的变化和晶体沿纤维轴的排列的变化所致。

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