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U.S. Department of Energy
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Development and laboratory testing of low Z refractory coatings for fusion reactor limiters

Conference ·
OSTI ID:5405001
A materials development program for low Z (Z < 24) coated tokamak limiters is described. A variety of refractory coatings applied by chemical vapor deposition, plasma spraying and chemical conversion to graphite and copper substrates have been evaluated. The results of laboratory testing for low energy hydrogen ion erosion, arc erosion and thermal fatigue by pulsed electron beam heating are reported. The 250 V hydrogen ion erosion data, analysed in terms of the effect of plasma radiation losses from resultant contaminants, indicates near equivalence of the very low Z (B and B/sub 4/C e.g.) and the moderate Z (e.g., TiB/sub 2/) coatings. Thermal fatigue testing has identified several candidate materials which can survice 1000, 3 kJ /cm/sup 2/ pulses of electron beam heating. The development of prototype limiters of TiB/sub 2/, TiC and B coated graphite for testing in the ORNL ISX-B tokamak is described.
Research Organization:
Sandia Labs., Albuquerque, NM (USA)
DOE Contract Number:
EY-76-C-04-0789
OSTI ID:
5405001
Report Number(s):
SAND-79-2409C; CONF-800455-6
Country of Publication:
United States
Language:
English