Carbonization of Aromatics with IV-Group Halides (IV). Lubricative Properties of Ge/C Composites.

Ge/C composites could be prepared by the polycondensation of anthracene with GeI4 at 400°C, followed by the high temperature treatments of polycondensed products from 750 to 3000°C. The lubricative properties of Ge/C composites formed were studied by measurement of friction factor, based on finding of their soft nature at time of pulverization. The friction of carbonized and graphitized Ge/C composites was found to decrease with the development of lamellar structure of the parent carbon materials. Nevertheless, Ge/C composites, prepared at even a lower temperature range from 1200 to 1500°C, showed small friction factors which were similar to those of graphite materials. This was considered to be due to the formation of composites with Ge.