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Study of Contact Angles of Metals and Alloys on the Superconducting YBa2Cu3O7-x

Published online by Cambridge University Press:  22 February 2011

Siu-Wai Chan ,
W. G. Bader ,
N. S. Yeung  and
G. W. Hull
Siu-Wai Chan
Affiliation:
Beilcore, Red Bank, N. J. 07701
W. G. Bader
Affiliation:
Beilcore, Red Bank, N. J. 07701
N. S. Yeung
Affiliation:
Beilcore, Red Bank, N. J. 07701
G. W. Hull
Affiliation:
Beilcore, Red Bank, N. J. 07701
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Abstract

Wettability and contactibility of selected metals and alloys on superconducting YBa2Cu3O7-x were studied. Droplets of metals and alloys were formed by melting short segments of wires on pellets of YBa2Cu3O7-x The wires were melted in a rapid thermal annealer with an oxygen atmosphere to lessen the oxygen loss from the YBa2Cu3O7-x surface. The contact angles of the solidified droplets on the pellets were measured from the micrographs taken with a scanning electron microscope. Contact angles less than 90° were obtained with Pb and Ag, while angles greater than 90° were obtained with Bi metal, 40Pb/60Sn, and 99Pb/lSb alloys. Pb alloyed with either Sn or Sb increased the wetting angles. The contact angles provided a direct measurement of wetting characteristics and were used to relate various surface energies and the work of adhesion between tested metallic systems and YBa2Cu3O7-x.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 153: Symposium J – Interfaces Between Polymers, Metals, and Ceramics , 1989 , 397
Copyright
Copyright © Materials Research Society 1989

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