FABRICATION AND CHARACTERIZATION OF HOT PRESSED Al2O3
- 7 July 1970
- report
- Published by Defense Technical Information Center (DTIC)
Abstract
Hot pressing of Al2O3 with and without LiF is described, and the resultant bodies are characterized. Addition of LiF significantly enhances densification, allowing dense bodies to be obtained at about 1100C, which is 200 to 300C lower than without additives. However, the additives result in exaggerated grain growth even during hot pressing. Though the fluoride content is reduced, both during hot pressing and subsequent annealing, some fluoride remains which could be detrimental to some properties of bodies made with LiF. Some of the problems and defects of pressing are emphasized as an aid to improving the process. Particular attention is given to the analysis of H2O, CO2, and S impurities (which are probably present as chemically bounded anions) and some of their known and possible effects on microstructure and behavior in materials made with and without additives.Keywords
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