Abstract
AbstractThe reactions and microstructure evolution in Al2O3‐Al system were researched through the experiments at a temperature range of 1,573–1,773 K in vacuum, along with thermodynamic analysis. The X‐ray diffraction and the scanning electron microscope were used to characterize the residues and the condensates. The results demonstrated that Al2O3 and Al reacted to form gaseous Al2O, and then the gaseous Al2O disproportionated into Al2O3 and Al with the decrease in temperature, which constituted the condensates together with the condensed Al from Al vapor. The residual Al2O3 and Al were transformed into the composite powders consisting of the interconnected Al2O3 flakes coated with Al, and the Al2O3 in the condensates were not coated by Al even at the condensation temperature up to about 1,523 K. It was deduced that the reaction between Al2O3 and molten Al should be the key factor leading to their bonding in vacuum.
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