Low temperature densification of silicon nitride materials

Dynamic hardness and elastic modulus calculation of porous SiAlON ceramics using depth-sensing indentation technique

“…[2][3][4] Because of the deterioration of the glassy phase at elevated temperature, several methods were developed for the production of silicon nitride-based or SiAlON ceramics either without any additives or with additives which are subjected to evaporation during/after densification. [5][6][7][8] On the other hand, the absence of the grain boundary liquid phase during sintering contributes to the formation of porous ceramics. Such porous silicon nitridebased or SiAlON ceramics are of great technological interest because of their excellent corrosion resistance both at room and elevated temperatures.…”

Chemical reactivity of hot-pressed Si3N4–ZrB2 ceramics at 1500–1700 °C

“…Previous studies have demonstrated that the densification Si 3 N 4 ceramics could be achieved at 1500 • C or below using spark plasma sintering or the addition of Na 2 O [20,21]. Therefore, fully dense Si 3 N 4 -ZrB 2 ceramics with no reaction could be potentially obtained by low temperature densification methods, which would be further explored in the future.…”

Effect of temperature on dielectric response in X-band of silicon nitride ceramics prepared by gelcasting

“…Among them, Si 3 N 4 ceramics are one of the most intensively studied ceramics in high temperature applications due to their superior antioxidation (>1200 • C), mechanical and chemical stabilization properties. [9][10][11][12][13][14][15][16] More importantly, owing to the excellent electrical insulation property and low dielectric constant, Si 3 N 4 ceramics are expected to be the promising candidate matrix of the high-temperature microwave absorbing materials. [17][18][19][20][21][22][23] Despite of the systematic studies related to dielectric properties of Si 3 N 4 ceramic composites from both experimental 13,[24][25][26][27] and theoretical aspects, 28,29 dielectric properties of Si 3 N 4 ceramic in a wide temperature range are rarely reported.…”