Wear and friction of thin film high temperature oxide superconductors
We have examined the sliding properties of a Nd-Fe-B magnet against a thin film YBa/sub 2/Cu/sub 3/O/sub 7/ 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 YBa/sub 2/Cu/sub 3/O/sub 7/ at a rate 1.3 /times/ 10/sup /minus/14/ m/sup 3//m and that the Nd-Fe-B/YBa/sub 2/Cu/sub 3/O/sub 7/ 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.
- Research Organization:
- Los Alamos National Lab., NM (USA)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 6151935
- Report Number(s):
- LA-UR-89-825; CONF-890468-1; ON: DE89009397
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
FILMS
FRICTION
OXIDES
OXYGEN COMPOUNDS
SLIDING FRICTION
SUPERCONDUCTING FILMS
TEMPERATURE DEPENDENCE
THIN FILMS
TRANSITION ELEMENT COMPOUNDS
WEAR
YTTRIUM COMPOUNDS