Statistical evaluation of the mechanical properties of partially oxygenated YBCO, oxygenated YBCO and oxygenated YBCO(Ag) single grains
Statistical evaluation of the mechanical properties of partially oxygenated YBCO, oxygenated YBCO and oxygenated YBCO(Ag) single grains
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DOI：
10.1016/j.ceramint.2023.07.128
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发表时间：
2023-07
影响因子：
5.2
通讯作者：
Josef Baumann;Yunhua Shi;J. Congreve;J. Durrell;D. Cardwell
中科院分区：
文献类型：
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作者：
Josef Baumann;Yunhua Shi;J. Congreve;J. Durrell;D. Cardwell
提高单颗粒YBCO超导体的力学性能具有重要意义，因为机械失效限制了这些材料在高场应用中的适用性。在11个部分氧化的YBCO，11个氧化的YBCO，和10个氧化的YBCO（银）熔融处理的大块单颗粒在统计上显着的方式使用巴西测试的显微结构对YBCO块体材料的力学性能的影响进行了研究。令人惊讶的是，氧裂纹演变过程中的四方相到正交相转变不影响的平均拉伸强度的YBCO大块单颗粒，压实裂纹和孔隙的主要微观结构缺陷负责机械故障。大块YBCO单颗粒的机械性能，甚至改善以下的氧化，所示的Weibull模量的增加。向YBCO中添加10重量%的Ag2O进一步增加了平均拉伸强度和威布尔模量，使得材料在机械上更坚固。然而，氧化YBCO和氧化YBCO（Ag）块体材料的测量的拉伸强度的重叠表明，并不是所有的含银样品具有更好的机械性能相比，氧化YBCO块体样品。
It is of great significance to enhance the mechanical properties in single grain YBCO bulk superconductors, as mechanical failure limits the suitability of these materials for high-field applications. The influence of the microstructure on the mechanical properties of YBCO bulk materials was studied in 11 partially oxygenated YBCO, 11 oxygenated YBCO, and 10 oxygenated YBCO(Ag) melt-processed bulk single grains in a statistically significant way using Brazilian testing. Surprisingly, the oxygenation cracks evolving during the tetragonal to orthorhombic phase transition do not influence the average tensile strength of YBCO bulk single grains, with compaction cracks and pores as the main microstructural flaws responsible for mechanical failure. The mechanical properties of bulk YBCO single grains even improve following oxygenation, as indicated by an increase in Weibull modulus. An addition of 10 wt% Ag2O to YBCO increases the average tensile strength and the Weibull modulus further, making the material mechanically more robust. However, an overlap in the measured tensile strengths of oxygenated YBCO and oxygenated YBCO(Ag) bulk materials reveals that not all silver-containing samples have better mechanical properties compared to oxygenated YBCO bulk samples.