Plasma facing materials for the next fusion reactor devices will have sever
e problems such as thermal shock fracture, surface erosion and injection of
sputtering particles to plasma caused by charged particle fluxes and very
high heat shocks. A joining material, in which a carbon fiber reinforced ca
rbon composite was joined to oxygen-free copper by inserting a molybdenum p
late and some metallic films in the joining layers, was developed for a sol
ution of those problems. The thermal shock resistance and the thermal shock
fracture toughness were evaluated by an eccentric local heating method of
are discharge. The joining material did not fracture during severe thermal
shock tests such as plasma disruption, however, thermal and delamination cr
acks were observed at the joining parts by scanning electron microscope (SE
M). These results can be useful in contributing to the development and the
safety design of plasma facing components for fusion reactor devices. (C) 1
998 Elsevier Science B.V. All rights reserved.