Abstract
A novel method of manufacturing strong Al2O3 bodies with low (<1%) shrinkage is presented. Compacts of attrition-milled Al/Al2O3 powder mixtures are heat treated at temperatures between 1200 and 1550°C such that the expansion due to the Al→Al2O3 reaction and the shrinkage on sintering of Al2O3 is nearly balanced. Depending on processing parameters such as Al/Al2O3 ratio, compaction pressure and heating cycle, a variety of different microstructures can be developed. In spite of some residual porosity, strengths of ∼300 MPa are attained.
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