Abstract
Isothermal sintering and grain growth studies were carried out on pure hematite cylindrical compacts at 1006°, 1100° and 1200°C. The compaction pressures were kept at 716, 1074, 1790, 2507 and 4297 kg/cm2 and sintering periods were 5, 10, 20, 30, 60 and 140 minutes. Very rapid initial sintering to the extent of 20–25% reduction in porosity was observed within the first 5 minutes. Higher initial compaction pressures caused an increasing degree of sintering but led to a very significant reduction in grain growth. Existing model of isothermal sintering due to Coble which does not consider fabrication factors such as compaction is unable to correlate the observed data.
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