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Mechanochemical‐Activation‐Assisted Combustion Synthesis of α‐Si 3 N 4
Author(s) -
Jin HaiBo,
Yang Yun,
Chen YiXiang,
Lin ZhiMing,
Li JiangTao
Publication year - 2006
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2005.00809.x
Subject(s) - combustion , nitriding , nitrogen , silicon nitride , reactivity (psychology) , materials science , silicon , chemical engineering , nitride , phase (matter) , nanotechnology , chemistry , metallurgy , organic chemistry , layer (electronics) , medicine , alternative medicine , engineering , pathology
Combustion synthesis (CS) of α‐silicon nitride (Si 3 N 4 ) powders was accomplished at a nitrogen pressure lower than 3 MPa. The combination of mechanical activation and chemical stimulation was effective in enhancing the reactivity of Si powder reactants, which was responsible for the reduction of the minimum nitrogen pressure normally required for the CS of Si 3 N 4 . This breakthrough indicates that nitriding combustion of silicon in pressurized nitrogen could be promoted by activating the solid reactants instead of by increasing the nitrogen pressure. The phase content of α‐Si 3 N 4 in the as‐synthesized product is over 90 wt%. Scanning electronic microscopy observation showed that the combustion‐synthesized Si 3 N 4 powders are submicron‐sized particles with spherical morphologies.