Thermal behaviour of SiCN nanopowders issued from laser pyrolysis

Synthesis under NH3 and thermal behaviour of SiCNAlO polymer-derived nanopowders

“…Therefore, the mass gain comes from powder nitridation, already identified by previous authors (Schemes 6 and 7). 24,44 The as-synthesized powder, with a C/N = 0.3 molar ratio, is rich in silicon nitride, and it also presents a SiAlON phase never detected in the other cases. This O'-SiAlON is derived from silicon oxynitride (Si 2 N 2 O) which formation occurs at 1400-1450 • C in N 2 .…”

Synthesis of SiCNAl(O) pre-alloyed nanopowders by pyrolysis of an aluminosilazane aerosol

“…9. 27 Al NMR (a), 29 Si NMR (b) and 13 C NMR (c) spectra for Si/Al = 15 (A) and 30 (B). is shorter in the case of the laser process.…”

“…7 On an other hand, nanostructured materials can be fabricated if an ultrafine multielement powder method is used. Several teams have worked and are still working on this route, [8][9][10][11][12][13] mainly using the laser-pyrolysis process, but their investigations concern mixtures of non-miscible precursors. They did not realize an unique hybrid precursor containing metallic elements needed for sintering.…”

“…29 Si NMR (a) and13 C NMR (b) spectra of 13A1L30 (A), 13A3L30 (B), 14A1L30 (C) and 14A3L30 (D) powders.…”

Manufacturing Nanocomposite Parts: Present Status and Future Challenges

“…Laser pyrolysis has also been developed to produce nanopowders. 55 The energy transfer from the laser beam to the substrate depends upon the absorptivity and thermal conductivity of the powder feedstock and the substrate. The energy of the beam is, in a very first step, absorbed in a narrow layer determined by the optical penetration depth of the radiation into the bulk material by excitation of the electron gas.…”