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Effects of silver additions on the mechanical properties and resistance to thermal shock of YBa2Cu3O7–δ superconductors

✍ Scribed by Jinho Joo; Seung-Boo Jung; Wansoo Nah; Jung-Yeul Kim; Tae Sung Kim

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
535 KB
Volume
39
Category
Article
ISSN
0011-2275

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✦ Synopsis

We evaluated the effects of silver (Ag) additions on the mechanical properties and resistance to thermal shock of bulk YBa 2 Cu 3 O 7- ␦ (YBCO) superconductors. Various amount of Ag was added to YBCO by two different mixing techniques, i.e. in the form of metallic Ag powder and AgNO 3 powder. It was observed that the bending strength (strength), fracture toughness and resistance to thermal shock of YBCO increased with increasing Ag content, probably due to strengthening mechanisms by the addition of Ag. In addition, YBCO-Ag composites made by mixing with AgNO 3 showed slightly higher strength, fracture toughness and resistance to thermal shock as compared with those made by mixing with metallic Ag powder. The improvement in the resistance to thermal shock is believed to be due to improvements in the strength, fracture toughness and thermal conductivity of YBCO-Ag composites resulting from Ag additions.

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