COMPACTION OF LITHIUM-SILICATE CERAMICS USING SPARK PLASMA SINTERING

Abstract

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.

Keywords

• Li₂Si₂O₅
• Li₂SiO₃
• Spark plasma sintering (SPS)
• Quantitative Rietveld refinement
• X-ray diffraction (XRD)