DEVELOPMENT OF UNIDIRECTIONAL C/C COMPOSITE WITH HIGH THERMAL-CONDUCTIVITY AND ITS APPLICATION TO PLASMA-FACING MATERIALS

Unidirectional C/C composite named ''MFC-1'' with high conductivity was developed, and full-scale armor tiles were fabricated. The thermal conductivity in the direction perpendicular to the plasma-side surface is more than 300-500 W/m.degrees-C, which is higher than those of other C/C composites ever made, even superior to that of pyrolytic carbon. It was shown by high heat load tests done using an electron beam test facility that the unidirectional C/C composite was very resistant against both surface erosion as well as severe thermal shock. The ''MFC-1'' was successfully brazed to copper substrate, and its high thermal shock resistance was observed in heat load tests (20 MW/m2, 3s, not cooled). A functionally gradient material has been also developed as compliant layer for the MFC-1 bonded to copper.