Wear and Friction of Thin Film High Temperature Oxide Superconductors.

摘要

We have examined the sliding properties of a Nd-Fe-B magnet against a thin film YBa2 Cu3 O7 superconductor. Pin-on-disk experiments were performed at room temperature and in normal air using a 10 mm magnetic Nd-Fe-B ball loaded to 31.22 g and a sliding speed of approximately 0.57 cm/sec. Such condition produced a steady state friction coefficient of 1.1 +- 0.3. Wear rate measurements indicated that Nd-Fe-B will wear YBa2 Cu3 O7 at a rate 1.3 /times/ 10/sup /minus/14/ m sup 3 /m and that the Nd-Fe-B/YBa2 Cu3 O7 sliding system possess a wear coefficient of 4.2 /times/ 10/sup /minus/14/ m sup 3 /Nm. These unusually high values appear to be the result of both abrasive and adhesive wear. Adhesion between the sliding surfaces is most probably enhanced by the oxygen reactivity of the pin material and the high oxygen content in the superconductor. 3 refs., 5 figs. (ERA citation 14:022557)