Sintering Characters Analysis of the Al2O3-86 Homogenized Bauxite
The present explains sintering characters of the Al2O3-86 homogenized bauxite under wet processes homogenization, which includes classified bauxite mine, wet grinding, vacuum extrusion, sintering in tunnel kiln,etc. DSC and TG reveal an evident peak of absorption heat at 531°C, resulting from the dehydroxylation of bauxite. Green samples held at 550°C*6hrs were heated up to different temperatures, and the properties of weight loss, linear change, bulk density and apparent porosity were measured. The data show that liquid-phase emerge and sintering process goes slowly above 1100°C. At 1500°C, large amounts of liquid-phase form, making liquid-phase sintering have a positive effect. The analysis of XRD and SEM indicate that, corundum grains develop more inadequate and most of the corundums interlace in a compact way, which can separate the widespread liquid phase and improve the sintering capability of homogenized bauxite.
Xianghua Liu, Kaifeng Zhang and Mingzhe Li
H. Y. Yang et al., "Sintering Characters Analysis of the Al2O3-86 Homogenized Bauxite", Advanced Materials Research, Vols. 690-693, pp. 35-39, 2013