PRODUCTION OF LITTLE OUTGASSING CARBONACEOUS MATERIAL AND CARBONACEOUS STRUCTURAL MATERIAL USING SAME

摘要

PURPOSE:To obtain the title carbonaceous material esp. such material as virtually not to outgas even used under highly reduced pressure and elevated temperatures, by heating a carbonaceous material under highly reduced pressure at specified temperatures followed by cooling and then repeating the above- mentioned treatment. CONSTITUTION:A carbonaceous material is heated to temperatures of >=800 deg.C under highly reduced pressure followed by cooling and then repeating the above- mentioned treatment at least once. Said carbonaceous material is pref. a carbon/ carbon composite where carbon fiber is incorporated into the carbon matrix. Prior to the heat treatment, said carbonaceous material has pref. been treated to high purity so that the total ash content fall at or below 10ppm. The carbonaceous material obtained by the above processes is suitable as the first wall structural material for nuclear reactors, a structural material for semiconductor production equipment to be used at temperatures of >=500 deg.C under reduced pressure or an interval structural material in reaction vessels.