Abstract
The spark plasma sintering (SPS) method was used for sintering of different SiAlON nanopowders obtained by the method of plasma synthesis. Almost entirely dense samples were obtained at 1450-1500 °C (the range of α-SiAlONs) and under 1600 °C (the range of α-/β-SiAlONs). Results of research were compared wit that obtained by the method of pressureless sintering. Samples obtained at 1700 °C have similar characteristics, differing only with the time of processing: by the SPS method the sample was obtained during 23 minutes (100 °C/min; 5 min.), but by the pressure-less sintering – during 290 minutes (10 °C/min; 120 min.). Material obtained by the pressure-less sintering contains the phase of α- SiAlON, but samples obtained by the SPS process contain almost only the phase of β- SiAlON and the reason of this effect is a specific crystallization process of nanopowders: firstly at temperatures over 1400 – 1450 °C β- SiAlON is formed and only after this the formation of α- SiAlON occurs over 1500-1550 °C. In the case of SPS process a rapid increase of temperature (100 °C/min) and short dwelling time at high temperatures (5 min.) is the reason, why the transition of β- SiAlON into α- SiAlON does not occur.
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