Conventional and SPS Sintering of a Nanocrystalline Alumina: A Comparative Study
In this paper, five powdered samples, containing different amounts of nanosized α-alumina, were obtained by controlled thermal pre-treatments of a transition alumina, and then densified by both free-sintering in air at 1500°C for 3 h and by Spark Plasma Sintering in the temperature range 1150°C - 1400°C with different soaking times at the maximum temperature. A comparative study of the influence of the phase composition in the starting alumina powders on both sintering behavior and microstructural features of the densified bodies is presented, showing a relevant influence of powder thermal pre-treatment on the SPS process, in a strict analogy to natural sintering.
P. Palmero et al., "Conventional and SPS Sintering of a Nanocrystalline Alumina: A Comparative Study ", Advances in Science and Technology, Vol. 45, pp. 957-962, 2006