Phase Relationships and Reaction Sintering of Transparent Cubic Aluminum Oxynitride Spinel
ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MA
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A new isobaric, condensed phase diagram in the region of stability of cubic aluminum oxynitride spinel ALON along the pseudobinary Al2O3-AlN composition join is presented, deduced primarily from various analytical measurements and microstructural observations. It is shown that cubic aluminum oxynitride spinel melts incongruently at about 2050 C and is compositionally centered at about 35.7 mole AlN which is equivalent to the following stoichiometric composition Al23O27N5 or 5 AlN.9 Al2O3. Single-phase ALON material sintered to nearly full density exhibits transparency in visible light.
- Ceramics, Refractories and Glass