May 2012 Processing of TiO 2 / TiC x O 1 − x Nano - ceramic Composite semiconductor : Novel Results

In this work, we present experimental studies for the processing of TiO2/ TiCxO1−x Nanoceramic Composite. This paper reports the synthesis of TiO2/ TiCxO1−x composite with Ti/C ratio 50:30 via spark plasma sintering route (SPS). The sinterability, microstructure and mechanical properties of the SPS processed sample was optimized with considering time and temperature. TiCxO1−x was reinforced in the TiO2 matrix by the solid state reaction with TiO2 and graphite. Different product was obtained by the carbothermal reaction at the different temperature. Fully dense composite with nano TiCxO1−x reinforcement was obtained after SPS at the high temperature. Fully dense composite shows superior hardness and toughness synthesis with SPS processes. Significant change in thermal conductivity is observed in these composite materials by the formation of different reinforcing constituent at the different temperature. These results suggest that the interface conditions strongly influence the thermal conductivity of the composite materials. Seeback studied was carried out for analyzing the nature of the composite materials. With the variation of temperature different types of the reinforcing constituents are formed with different charge carrier.