Accession Number:

ADA243668

Title:

Examining Si3N4 Base Materials with Various Rare Earth Additions

Descriptive Note:

Final rept.

Corporate Author:

ARMY LAB COMMAND WATERTOWN MA MATERIALTECHNOLOGY LAB

Personal Author(s):

• Gazza, George E.

Report Date:

1991-12-01

Pagination or Media Count:

25.0

Abstract:

Silicon nitride base compositions were prepared by using various rare earth oxide additives and hot pressing the powders to full density. Compositions were primarily explored in Si3N4-SiO2-RE2Si2O7 compatibility regions although other Si3N4-RE2O3 reactions were also investigated. Hot pressing densification data and high temperature behavior of the various silicon nitride rare earth compositional systems are examined.

Descriptors:

• *DENSITY
• POWDERS
• HIGH TEMPERATURE
• HOT PRESSING
• CHEMICAL COMPOSITION
• OXIDES
• ADDITIVES
• BEHAVIOR
• RARE EARTH COMPOUNDS
• RARE EARTH ELEMENTS
• ADDITION

Subject Categories:

• Crystallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE