EVOLUTION OF MICROTEXTURE IN FURAN RESIN-DERIVED CARBON WITH HEAT-TREATMENT

Microtextural evolution in furan resin-derived carbon was investigated . The evolution was mainly studied from the viewpoint of the change in microtexture of surface and internal pores with heat-treatment and wa s characterized by observation with a scanning electron microscope, me asurement of the BET surface area, X-ray diffraction and Raman spectro scopy. Microporous layers, about 60 mu m thick, were formed on the sur face during carbonization at 1000 degrees C when furan resin was polym erized in ambient air. The layer partially changed into graphite with a small surface area after heat-treatment at 2600 degrees C, the insid e remaining amorphous. The microporous layer was easily rearranged to form a graphite layer, compared to the inside. The carbons that existe d in the internal closed pore during heat-treatment at 1000 degrees C changed into turbostratic carbon by heat-treatment at 2600 degrees C. The texture resulted from mass transport through gas phase during the heat-treatment.