The primary results for the mixed carbon material used for high flux steady-state tokamak operation in China

Several types of carbon mixed materials have been developed in China to be used for high flux steady-state tokamak operation. Performance evaluation o f these materials is necessary to determine their applicability as PFCs for high flux steady state. This paper describes the primary results of carbon mixed materials and the effects of dopants on properties are primarily dis cussed. Test results reveal that bulk boronized graphite has excellent phys ical and mechanical properties while their thermal conductivity is no more than 73 W/m K due to the formation of a uniform boron-carbon solid solution . In case of multi-element doped graphite, titanium dopant or a decreased b oron content is favorable to enhance thermal conductivity. A kind of doped graphite has been developed with thermal conductivity as high as 278 W/m K by optimizing the compositions, Correlations among compositions, microstruc ture and properties of such doped graphite are discussed. (C) 2001 Publishe d by Elsevier Science B.V.