Spatial Distribution of Flexural Strength in Y-Ba-Cu-O Bulk Superconductors

被引：9

作者：

Huang, Kai Yuan ^{[1
]}

Zhou, Difan ^{[1
]}

Srpcic, Jan ^{[1
]}

Shi, Yunhua ^{[1
]}

Namburi, Devendra K. ^{[1
]}

Dennis, A. ^{[1
]}

Ainslie, Mark D. ^{[1
]}

Boll, Martin

Bause, Roman ^{[2
]}

Filipenko, Mykhaylo ^{[2
]}

Durrell, John H. ^{[1
]}

Cardwell, David A. ^{[1
]}

机构：

[1] Univ Cambridge, Dept Engn, Bulk Superconduct Grp, Cambridge CB2 1TN, England

[2] Siemens AG, Corp Technol, D-80333 Munich, Germany

来源：

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY | 2018年 / 28卷 / 04期

基金：

英国工程与自然科学研究理事会;

关键词：

Yttrium barium copper oxide; superconducting magnets; flexural strength; Weibull distribution; HIGHLY ALIGNED YBA2CU3O7-DELTA; HIGH TRAPPED FIELDS; MECHANICAL-PROPERTIES; FRACTURE-TOUGHNESS; CURRENT-DENSITY; TEMPERATURE; PARTICLES; Y2BACUO5; GROWTH; MICROSTRUCTURE;

D O I：

10.1109/TASC.2018.2814055

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

In order to determine the spatial distribution of the flexural strength, three-point bend tests have been performed on bar specimens cut from four YBa2Cu3O7-delta single-grain bulk superconductors. A relatively large spread of the room temperature flexural strength, average and standard deviation of 49.3 MPa and 12.7 MPa, respectively, was observed across the four bulk samples. This is attributed to the systemic microstructural variation introduced by the seeded melt growth. In particular, the strength was shown to be related to the local porosity and Y2BaCuO5 content. To further examine bulk-to-bulk variability, indirect tensile (Brazilian) tests were conducted on twelve 16-mm-diameter bulk superconductors from three production batches. TheWeibull modulus for these was calculated to be 8.76, suggesting that, despite the large spread in strength with position within a bulk, the batch processing of bulk superconductors can consistently yield samples with comparable overall mechanical strengths.

引用

页数：5

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