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Coefficients of friction of YBCO-YBCO and YBCO-Ag ball-on-flat couples

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Abstract

The coefficient of friction of polycrystalline YBa2Cu3O7 − x(YBCO) on YBCO and YBCO on Ag was measured versus temperature and humidity in a ball-on-flat linear reciprocating experiment. The coefficient of friction as a function of strokes has initial and steady state values. In laboratory air, the average coefficients of friction of the YBCO-YBCO couple in the steady-state show a maximum of 0.90 at 100°C, while those for YBCO-Ag show a minimum of 0.26 at 400°C. The coefficient of friction of the YBCO-YBCO couple at 100 and 200°C exhibits a transition as the humidity increases. This transition is associated with cylindrical wear debris.

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  1. Department of Civil Engineering, Mechanics, and Metallurgy, University of Illinois at Chicago, PO Box 4348, m/c 246, 60608, Chicago, Illinois, USA

    Yue Fang & S. Danyluk

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  1. Yue Fang
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  2. S. Danyluk
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Fang, Y., Danyluk, S. Coefficients of friction of YBCO-YBCO and YBCO-Ag ball-on-flat couples. JOURNAL OF MATERIALS SCIENCE 28, 5658–5662 (1993). https://doi.org/10.1007/BF00367843

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