Self-sustaining coatings for fusion applications - copper lithium alloys
Auger electron spectroscopy has been used to monitor the surface composition of an alloy consisting of 3.0 at. % Li in Cu while sputtering with 1 to 3 keV Ar/sup +/ or He/sup +/ at a flux of 10/sup 12/ to 10/sup 14/ cm/sup -2/ sec/sup -1/ (corresponding to a gross erosion rate of several mm/yr) at temperatures up to 430/sup 0/C. It is found that the alloy is capable of reproducibly maintaining a complete lithium overlayer. The time-dependent thickness of the overlayer depends strongly on the mass and energy spectrum of the incident particle flux. It has been experimentally demonstrated that a significant fraction of the sputtered lithium is in the form Li/sup +/ and is returned to the surface by an electric field such as the sheath potential at the limiter, or a tangential magnetic field such as the toroidal field at the first wall; consequently, the overlayer lifetime is essentially unlimited. The TRIM computer code has been used to calculate the sputtering yield for pure metals and the partial sputtering yields of binary alloy components for various assumed solute concentration profiles.
- Research Organization:
- Argonne National Lab., IL (USA); Georgia Inst. of Tech., Atlanta (USA)
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 5999883
- Report Number(s):
- CONF-850310-46; ON: DE85009740
- Resource Relation:
- Conference: 6. topical meeting on the technology of fusion energy, San Francisco, CA, USA, 3 Mar 1985
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
COATINGS
SPUTTERING
COPPER ALLOYS
LITHIUM ALLOYS
ARGON IONS
AUGER ELECTRON SPECTROSCOPY
HELIUM IONS
ALLOYS
CHARGED PARTICLES
ELECTRON SPECTROSCOPY
IONS
SPECTROSCOPY
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