Abstract
The use of iron ores with high gangue content in industrial sintering leads to varying sinter quality; this also applies when formation of calcium-ferrites is optimized to enhance sinter strength. In this study, pot sinters containing calcium-aluminosilicoferrites as a matrix phase were tested for their mechanical properties. It was found that the presence of the ferrite matrix had a positive effect on sinter strength, which was also influenced by the chemical compositions of the ferrites. Nanoindentation measurements on custom-synthesized calcium-aluminosilicoferrite crystals revealed a correlation between the alumina content of the ferrite phase and its mechanical properties, which ultimately also controls sinter strength. Both the modulus and the hardness of the SFCA phase increased with further incorporation of Al2O3. However, with increasing hardness the SFCA phase became more brittle, and this is a cause of bulk sinters becoming weaker. There was however no detectable effect of silica or other minor components on the mechanical properties of the ferrites.
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