Scopul nostru este sprijinirea şi promovarea cercetării ştiinţifice şi facilitarea comunicării între cercetătorii români din întreaga lume.
Autori: 4. Anca Dumitru, Ioan Stamatin, Adina Morozan, C. Mirea and V. Ciupina
Editorial: Materials Science and Engineering C , Volume 27, p.1331-1337, 2007.
Multicomponent powders based on SiCN and SiCN containing iron systems are of
great interest as starting materials for sintering advanced ceramics and
composites with improved properties for high temperature applications.
We report a versatile method by which are designed inorganic polymers with a
defined composition as precursors for a ceramic with induced properties. The
synthesis of Si-C-N and Si-C-N- iron polymer precursors are performed in
improved configuration of plasma assisted chemical vapor deposition (CVD)
coupled with chemical transport reaction (CTR) with inorganic monomers,
hexamethyldisilazane and ferrocene/hexamethyldisilazane as precursors. Further,
the resulted polymers are then pyrolysed at 12000 C under nitrogen atmosphere
into nanostructured ceramics (such as Si3N4, Fe3C).
The conversion process of the polymer precursors into nanostructured ceramic
were followed mainly by FT-IR, XRD, TEM and SEM investigation. Infrared
spectroscopy of polymers revealed the presence of Si-C, Si-N, C-N and
hydrogenated bonds. Transmission electron microscopy showed the polymers are
made of nanometric round-shape particles with the average particle size around
20-40 nm for SiCN and 40-80 nm for SiCN containing iron.
Cuvinte cheie: bio-based materials, bioceramics, materials for bioenergy applications