Several carbon-based materials (carbon fibre composites NB 31, NS 31 and UAM-92,doped graphite RGTi-91), were irradiated at about 90 degreesC in the damage dose range 0.0021-0.13 dpa. Significant reduction of the thermal conductivity of all materials was observed (e.g. at damage dose of similar to0.13 dpa the thermal conductivity degraded up to level of similar to2-3% of the initial values). However, saturation of this effect was observed starting at a dose of similar to0.06 dpa. The effect of annealing at 250 and 350 degreesC on the recovery of thermal conductivity of NB 31 and NS 31 was studied and it was shown this annealing can significantly improve thermal conductivity (similar to2.5-3 times). The data on the degradation of the thermal conductivity after additional irradiation after annealing is also reported. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 10]
展开▼
