The Regularity Study of Spark Plasma Sintering of ?-Sialon Ceramics

K. L. Smirnov, E. G. Grigoryev

Abstract


Investigated were the spark plasma sintering of ?-sialon ceramics according two different schemes: the simple sintering of pure ?-Si5AlON7 powder and the reactive sintering of mixture of ?-Si3N4 and ?-Si2Al4O4N4 powders. The high-density homogenous structure of simple sintered ?-Si5AlON7 ceramics was achieved at maximum temperature of isothermal holding Tmax = 1550 °C by using submicron raw powder. While ceramics from coarse raw powder had porous structure and was subjected to thermal decomposition at Tmax ? 1750 °С. Three specific temperature intervals were revealed for the reactive sintering. At Tmax ? 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 ?-Si3N4 into ?-sialon. At Tmax = 1700-1750 °С, starting ?-Si3N4 was found to undergo transformation into ?-sialon but without marked changes in the size/morphology of starting particles. At Tmax ? 1750 °С, the sintered ceramics exhibited a marked growth in the size and change in the shape of sintered particles.

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References


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DOI: http://dx.doi.org/10.24892/RIJIE/20190306

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