| Abstract: | Conversion of N ‐Methylpolyborosilzane to Amorphous Siliconboroncarbonitride The amorphous ceramic ‘SiBN3C' has been synthesized starting from 1,1‐dichloro‐N‐(trichlorosilyl)‐boranamine (TADB) with N‐methylpolyborosilazane as a polymeric intermediate. On heating the ceramic up to 1900 °C no microstructural changes occur. The thermal conversion of the preceramic polymer was investigated by thermal analysis, infrared spectroscopy and nuclear magnetic resonance spectroscopy. Surprisingly, the pyrolysis proceeds in three clearly divided steps which can be assigned to completion of the polycondensation (200–350 °C), fragmentation (580–620 °C) and elimination of residual hydrogen (1000–1400 °C). |
