Abstract
Investigated were the spark plasma sintering of ?-sialon ceramics according two different schemes: the simple sintering of pure ?-Si 5 AlON 7 powder and the reactive sintering of mixture of ?-Si 3 N 4 and ?-Si 2 Al 4 O 4 N 4 powders. The high-density homogenous structure of simple sintered ?-Si 5 AlON 7 ceramics was achieved at maximum temperature of isothermal holding T max = 1550 °C by using submicron raw powder. While ceramics from coarse raw powder had porous structure and was subjected to thermal decomposition at T max ? 1750 °С. Three specific temperature intervals were revealed for the reactive sintering. At T max ? 1650 °С, the shrinkage rate attained the values sufficient for densification near to a theoretical density, without any changes in the size/morphology of starting particles and without transformation of starting ?-Si 3 N 4 into ?-sialon. At T max = 1700-1750 °С, starting ?-Si 3 N 4 was found to undergo transformation into ?-sialon but without marked changes in the size/morphology of starting particles. At T max ? 1750 °С, the sintered ceramics exhibited a marked growth in the size and change in the shape of sintered particles.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
