PTFE, an effective additive on the combustion synthesis of silicon nitride

Salt-assisted combustion synthesis of silicon nitride with high α-phase content

“…Cao et al reported that sodium azide (NaN 3 ) is useful in the preparation of Si 3 N 4 whiskers with 80% ␣-phase content [22]. Combustion synthesis of ␣-Si 3 N 4 with the addition of polytetrafluoroethylene (PTFE) was reported by Chen et al [26]. It was shown that the addition of 4 wt.% PTFE promotes the nitridation of Si and yields a final product containing 77.7% ␣-Si 3 N 4 .…”

A cost-effective approach to improve dielectric property of SiC powder

“…Meanwhile, the decomposition of NH 4 Cl took place at high temperature via the following reactions [14][15][16]:…”

Porous Si3N4 ceramics prepared via partial nitridation and SHS

“…Up to now, SHS has been widely used in preparation of Si 3 N 4 powder. [10][11][12][13][14][15] However, due to the high exothermic reaction of Si and N 2 , as shown in reaction The melting of Si particles in the combustion front is inevitable, and the subsequent coalescing of melted Si inhibits completion of the nitridation. The addition of Si 3 N 4 as diluents into the reactants has been proven to be an effective way to prevent the coalescence of melted Si and enhance the degree of nitridation.…”