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:
The progress on the combustion synthesis of Si3N4 powders during the past decades wassummarized with the emphasis on the recently developed mechano-chemically activated combustionsynthesis (MACS) method. The effects of processing parameters such as the addition of diluent andammonium salts into the green mixtures, the variation of nitrogen pressure as well as the mechanicalactivation treatment on the degree of Si to α-Si3N4 conversion was evaluated. The combination ofmechanical activation and chemical stimulation was effective in enhancing the reactivity of Si powderreactants, which was responsible for the extension of the minimum nitrogen pressure normally requiredfor the combustion synthesis of Si3N4. This breakthrough indicates that nitriding combustion of silicon inpressurized nitrogen could be promoted by activating the solid reactants instead of by increasing thepre-exerted nitrogen pressure. The MACS process was successfully applied to the industrial production ofSi3N4 powders, the regularities for the large-scale synthesis were reported, and the as-synthesized Si3N4powder products were systematically characterized
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.911.pdf
