Abstract
Thermal fatigue testing was performed on eight coated or clad materials which have potential application as limiters in pulsed tokamak fusion devices. They are (1) chemically vapor-deposited coatings of TiC, TiB 2 and boron on graphite, (2) plasma-sprayed TiB 2 on copper, (3) a chemical conversion coating of VB 2 on vanadium-clad copper, (4) titanium-clad copper and (5) vanadium-clad copper. Testing consisted of up to 1000 cycles of electron beam heating for 1.5 s at beam power densities of 1 and 2 kW cm −2. Three materials, chemically vapor-deposited TiC and TiB 2 on graphite, and plasma-sprayed TiB 2 on copper, survived the 1000 cycle 2 kW cm −2 test with slight but acceptable damage. The most notable test failure was VB 2 on vanadium-clad copper which deformed severely by a thermal ratcheting mechanism and displayed subsurface melting.
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