M L. Greene et al. / Carbon 40 (2002)1217-1226 1.8600 1200 HTT=3000 .8500-HTT=2700 -HT=2400 1000 1.8400 1.8300 1.8200 218 1.8100 1.8000 4.00 200-HT=3000 1.7800 HTT=2700 C-HTT=2400 1.7700 000 100 Log Residence Time(seconds) (b) 06 : △HTT Fig. 2.(a) Density, (b)resistivity/thermal conductivity, and(c)calculated degree of graphitization of Fiber B as a function of residence time at graphitization temperatures of 2400, 2700, and 3000C. Asterisks(*)indicate heat treatment times during which densification proceeds at a slower rate Fig. 2b shows the electrical resistivity of Fiber B as a 14 19 uQ m, and the broadest door diffraction peak, function of graphitization conditions. Fiber B(as-received) suggesting a low degree of structural order in this fiber had the highest electrical resistivity of the three precursors, With graphitization, the resistivity decreased significantly,1222 M.L. Greene et al. / Carbon 40 (2002) 1217 –1226 Fig. 2. (a) Density, (b) resistivity/thermal conductivity, and (c) calculated degree of graphitization of Fiber B as a function of residence time at graphitization temperatures of 2400, 2700, and 3000 8C. Asterisks (*) indicate heat treatment times during which densification proceeds at a slower rate. Fig. 2b shows the electrical resistivity of Fiber B as a 14.19 mV m, and the broadest d diffraction peak, 002 function of graphitization conditions. Fiber B (as-received) suggesting a low degree of structural order in this fiber. had the highest electrical resistivity of the three precursors, With graphitization, the resistivity decreased significantly