Accession Number:

AD0739905

Title:

Growth of Large Monocrystals of Al2O3 by a Gradient Furnace Technique.

Descriptive Note:

Technical rept.,

Corporate Author:

ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MASS

Personal Author(s):

• Viechnicki,Dennis J.
• Schmid,Frederick

Report Date:

1971-12-01

Pagination or Media Count:

10.0

Abstract:

A new technique, a gradient furnace technique, has been developed for the high-temperature growth of large monocrystals of Al2O3 from the melt. The technique employs a vacuum graphite resistance furnace with a helium-cooled tungstenmolybdenum heat exchanger protruding into it. Author

Descriptors:

• *CRYSTAL GROWTH
• *SAPPHIRE
• DISLOCATIONS
• IMPURITIES
• INFRARED WINDOWS
• ALUMINATES

Subject Categories:

• Manufacturing and Industrial Engineering and Control of Production Systems
• Crystallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE