High Pressure / Low Temperature Sintering of Nanostructured Titania by Internal Heating Method
The feasibility of an internal heating method for the fabrication of large-scale nanostructured TiO2 samples by high pressure/low temperature sintering is studied. The primary apparatus used is a piston-cylinder type. The arrangement inside the die cavity consists of a circular cylindrical green compact, a graphite furnace to heat the sample, an aluminum container to protect the sample and an aluminum silicate or lava tube for electrical insulation. When the sample inside the mold achieved the desired sintering temperature, the temperature of the thermally insulated mold stayed low enough not to damage the mold itself. An obtained cylindrical sample has dimensions of 12.7 mm (1/2 inch) in diameter by 28.6 mm (1 1/8 inch) long. Its average grain size is 64 nm and the Vicker’s hardness is 5.3 GPa.
T. Ohji, T. Sekino and K. Niihara
C. H. Chiang et al., "High Pressure / Low Temperature Sintering of Nanostructured Titania by Internal Heating Method", Key Engineering Materials, Vols. 317-318, pp. 255-258, 2006