Effect of Powder Characteristics on the Densification of Sintered Alumina
Abstract. The effect of particle size distribution, soaking time and sintering temperatures on the densification behaviors of α-Al2O3 was investigated. Two different average particle sizes of 36 and 45µ were examined as a variable to analyze the difference in density, radial and axial shrinkage, densification, and microstructure developments. Conventional powder technology route was used to prepare disc-shaped green pellets sintered at 1200-1600°C for different periods. Density measurements for both green and sintered compacts allow for the refinement of processing parameters to obtain dense sintered bodies. Compacts with particle size of 36 µm were noticed to attain higher relative densities as compared with those of 45µm. Densification parameter (∆P) calculations clearly reveals the presence of definite temperatures and times in which limited densification retardation occurred, which permits the suggesting of suitable sintering schemes for this material. Scanning electron micrographs analysis revealed a pore structure assist the observed behaviours for the different schemes.
Maher Soueidan, Mohamad Roumié and Pierre Masri
Z. S. A. Al Sarraj and S.S. Noor, "Effect of Powder Characteristics on the Densification of Sintered Alumina", Advanced Materials Research, Vol. 324, pp. 65-68, 2011