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Optimization of density of microwave sintered alumina ceramics due to the corrosion in nitric acid

The objective of this study was to investigate and analyse the bulk density of cold isostatically pressed and microwave sintered high purity alumina ceramics. Bulk densities were determined before and after the corrosion in aqueous HNO3 solutions in a concentration range of 0.5 mol dm-3, 1.25 mol dm-3 and 2 mol dm-3 with different exposure times – up to 10 days. The influence of temperature (25, 40 and 55 °C) on corrosion was also monitored. Ceramic bulk density was determined by the Archimedes' method. Response surface methodology was used for optimization of density within experimental “sample-corrosive media” area. Exposure to corrosive media was conducted according to the Box- Behnken design. After regression function was defined, conditions to achieve maximal corrosion resistance of sintered ceramics (retention of maximal density achieved after sintering) were determined by optimization within experimental area.

alumina ceramic density response surface methodology optimization

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