Thermal cycling behavior of YBCO high temperature superconductor thick films

Author

Yang, F. ; Liu, Y. ; Wu, K.H. ; Larkins, G.

Author_Institution

Dept. of Mech. Eng., Florida Int. Univ., Miami, FL, USA

Volume

9

Issue

2

fYear

1999

fDate

6/1/1999 12:00:00 AM

Firstpage

1975

Lastpage

1978

Abstract

Thermal cycling behavior of YBCO high temperature superconductor thick films coated on different ceramic substrates was studied. It was found that the YBCO superconductor thick film coated on MgO substrate has a better thermal cycle resistance than Al/sub 2/O/sub 3/ substrate; the cycle number for initiating thermal fatigue crack significantly decreases as the thermal cycling temperature range increases. Film thickness was found to have an influence on thermal cycling resistance for thicknesses in the range of 70 to 100 /spl mu/m. A simple thermal mechanical model is employed to describe the thermal stress, and the thermal cycles of failure of YBCO thick films.

Keywords

barium compounds; high-temperature superconductors; superconducting thin films; thermal stability; thermal stresses; yttrium compounds; Al/sub 2/O/sub 3/; Al/sub 2/O/sub 3/ substrate; MgO; MgO substrate; YBa/sub 2/Cu/sub 3/O/sub 7/; ceramic substrates; high temperature superconductor thick films; mechanical model; thermal cycling behavior; thermal stress; Ceramics; Fatigue; High temperature superconductors; Substrates; Superconducting films; Temperature distribution; Thermal resistance; Thermal stresses; Thick films; Yttrium barium copper oxide;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.784849

Filename

784849