ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Combustion synthesis (CS) of Si3N4 was accomplished by using as-milled Si/NH4Cl asreactants at low nitrogen pressure. The additive of NH4Cl decreased the combustion temperature andpromoted the Si nitridation. Full nitridation of Si was achieved by burning Si in pressurized nitrogen with10 ~ 25 wt. % NH4Cl as additives while no Si3N4 diluent added. The maximum combustion temperature(Tc), the combustion velocity (u) together with the α-Si3N4 content and mean particle size (d50) of thepowder products were found to be great dependent on the NH4Cl content added in the reactants. FineSi3N4 powder products with α-phase content up to 85 wt. % were obtained via steady combustion mode. Amathematical approach named combustion wave velocity methods for the analysis of temperature profilesin CS was proposed and the reaction kinetics was discussed. The apparent activation energy calculatedaccording to the temperature profile analysis method is 29.7 kJ/mol, which agrees well with thecorresponding low temperature nitriding combustion of Si
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.1767.pdf
Permalink
