Study of the friction and wear-related properties of ceramic superconductors
The recent interest in high critical temperature (T/sub c/) superconductors has created a need to examine the tribological properties of these materials for defining potential applications and handling characteristics. This paper discusses preliminary information about the reciprocating sliding friction coefficients (self-mated and on gold), scratch resistance, microindentation hardness, and surface damage mechanisms in Y-Ba-Cu-O compounds. These compounds are fabricated in several ways including traditional powder compaction and solution-growing of single crystals. As expected, the materials are quite brittle, but Knoop microindentation hardness numbers for single crystals can exceed 4.41 GPa (450 kg/mm/sup 2/). Scratch resistance using a diamond-stylus test decreases with increasing load because intergranular and transgranular cracking increases with load. Friction coefficients on gold range from 0.12 to 1.0, depending on test duration, and those for self-mated sliding range between 0.15 and 1.1, also depending on test duration. Results suggest that the materials are brittle in their monolithic form, but that they show some ability to resist abrasion and sliding wear in a controlled environment.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 7078665
- Report Number(s):
- CONF-880317-2; ON: DE88011844
- Resource Relation:
- Conference: ASM symposium on engineered materials for advanced friction and applications, Gaithersburg, MD, USA, 1 Mar 1988; Other Information: Portions are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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