Accession Number:

ADA071801

Title:

Phase Relationships and Reaction Sintering of Transparent Cubic Aluminum Oxynitride Spinel

Descriptive Note:

Final rept.

Corporate Author:

ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MA

Personal Author(s):

• McCauley, James W.
• Corbin, Normand D.

Report Date:

1979-05-01

Pagination or Media Count:

18.0

Abstract:

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.

Descriptors:

• *ALUMINUM OXIDES
• *SINTERING
• *SPINEL
• MICROSTRUCTURE
• CRYSTAL STRUCTURE
• TRANSPARENCE
• THERMAL STABILITY
• PHASE STUDIES
• NITRIDES
• CERAMIC MATERIALS
• LIGHT TRANSMISSION
• CHEMICAL EQUILIBRIUM
• STOICHIOMETRY
• PHASE DIAGRAMS
• POLYCRYSTALLINE
• OXYNITRIDES

Subject Categories:

• Ceramics, Refractories and Glass
• Crystallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE