Ceramic materials from organometallics
- Univ. of Erlangen-Nuemberg, Erlangen (Germany)
Manufacturing of ceramic components from materials in the system Si-Me-C-N-O (Me = Ti, Cr, V, Mo, Si, B, CrSi{sub 2}, MoSi{sub 2}, etc.) from preceramic organosilicon polymers such as polycarbosilanes, -silazanes or -siloxanes; has become possible by incorporating reactive filler particles into the liquid or solid polymer precursor. During pyrolytic decomposition of the polymer matrix the filler particles react with carbon from the polymer precursor or nitrogen from the reaction gas atmosphere to form new (oxy)carbide or (oxy)nitride phases embedded in a nanocrystalline Si-O-C(-N) matrix. The selective expansion encountered in the filler phase reaction can be used to compensate for the polymer shrinkage upon pyrolytic conversion. Near net shape forming of bulk ceramic components even with complex geometry is possible making novel applications of polymer derived bulk materials in biomedical, electrical and mechanical fields highly interesting.
- OSTI ID:
- 99132
- Report Number(s):
- CONF-940911--
- Country of Publication:
- United States
- Language:
- English
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