ピッチ系及びPAN系半導性炭素繊維の電気的特殊

概要

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Pitch-and PAN-based semiconductive carbon fibers were prepared by final heat treatments at 400 to 900°C in pure N_2 (O_2 concentration<10-<-10>%) and in O_2-mixed N_2 (O_2 concentration = 0.2%). Electrical resistivity at 20°C, thermistor constant and resistivity changes by applying high-voltage pulses were measured and compared with two kinds of carbon fibers. Below the heat treatment temperature of 700°C, the pitch-based fibers showed higher resistivities than the PAN-based fibers. The difference in resistivity of these fibers increased by heat treatments at lower temperatures and in pure N_2. The pitch-based fibers showed smaller thermistor constants than the PAN-based fibers with the same resistivity, but those values became closer wthen heat-treated in pure N_2. Results of XPs showed that oxygen concentration on fiber surfaces was higher n fibers heat-treated in O_2- containing N_2 and that the effect of heat treatment atmosphere was evident in deeper region form the surface in the pitch-based fibers. It was assumed that the O_2 concentration in atmosphere influences the electrical properties mainly at the surface for PAN-based fibers and in the core for pitch-based fibers.
社団法人日本セラミックス協会の論文
1995-09-01