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This paper deals with the compaction of ceramics based on lithium-silicate by spark plasma sintering (SPS). The initial powder was prepared by calcination in a resistance furnace at a temperature of 1300°C with the ratio of Li/Si = 1. Compacting by SPS was carried out at temperatures of 800 1000°C with a maximum pressure of 80 MPa. Samples with open porosity of less than 1 % were prepared at the temperature of 1000°C. According to the quantitative Rietveld refinement of x-ray diffraction data, the dominant phases in all samples were Li2Si2O5 and Li2SiO3, together representing over 80 wt. % of the sintered material.

COMPACTION OF LITHIUM-SILICATE CERAMICS USING SPARK PLASMA SINTERING