NANO CARBON MATRIX/NANO SiC GRAIN FIBER WEBS FOR THE APPLICATION TO HIGH THERMAL CONDUCTING SUBSTRATE

摘要

One of most interesting characteristic of PCS is the presence of nanodomains in the microstructures[l,3]. Recent analysis data allows the identification of shape of these nanodomains in carbon-rich SiCO, SiCN. PCS could be spun to form fiber webs by electrospinning PCS solution in 30% DMF/toluene solvent at 25kV. The electrospun web is stabilized at 200°C for 30 min to connect fibers by softening PCS webs and pyrolysed to synthesize SiC webs at 1300°C. [2] Consequently, the pyrolysis at 1300°C forms nano carbon matrix and nano SiC grain in the SiC fiber, which could afford to increase thermal conductivity through nano carbon matrix and nano SiC grain. Thermal treatment to PCS fiber introduce carbon layer that is grapheme layer into microstructure of SiC fiber. Nano carbon matrix and nano SiC fiber webs could be mixed with phenol resin and molded by hot-pressing. The thermal conductivity measurement indicates that higher C contents increase the thermal conductivity up to 10.1 W/mK for 43 filler contents from 0.5W/mK for 14% filler contents.