Phase Relationships and Reaction Sintering of Transparent Cubic Aluminum Oxynitride Spinel.

摘要

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. (Author)