Research on Aluminum Nitride Materials

Research on Aluminum Nitride Materials

This report summarizes the progress made during the second year of AFOSR contract support in growing single crystals and producing ceramic samples of aluminum nitride for use as electronic heat sinks and surface acoustic wave (SAW) devices. An improved aluminum pellet-drop technique for making 70-g...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: Slack,Glen A, McNelly,Thomas F
Format: Report
Sprache:eng
Schlagworte:
ACOUSTIC WAVES
ALUMINUM COMPOUNDS
CERAMIC MATERIALS
Ceramics, Refractories and Glass
CONDENSATION REACTIONS
CRYSTAL GROWTH
Crystallography
ELECTRICAL RESISTANCE
ELECTRONIC EQUIPMENT
HEAT SINKS
NITRIDES
OPTICAL PROPERTIES
PE61102F
PIEZOELECTRIC MATERIALS
SINGLE CRYSTALS
SUBLIMATION
SURFACE WAVES
THERMAL CONDUCTIVITY
WUAFOSR2306B2
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Beschreibung
Zusammenfassung:This report summarizes the progress made during the second year of AFOSR contract support in growing single crystals and producing ceramic samples of aluminum nitride for use as electronic heat sinks and surface acoustic wave (SAW) devices. An improved aluminum pellet-drop technique for making 70-g quantities of ALN starting material has been developed. By subliming and recondensing this material in sealed tungsten crucibles at temperatures between 2100 C and 2350 C, crystals up to 1.2 cm in length and 0.4 cm in diameter have been grown. The problem of pinhole attack of tungsten by ALN has been studied in detail, and a technique for producing long-lived crucibles using W foil has been developed.