Effect of microstructure on mechanical properties of silicon nitride ceramics: Final report for period April 1, 1984 through March 31, 1988

Technical Report · Sun May 01 04:00:00 EDT 1988

OSTI ID:5676731

Tien, T Y

The goal of this project was to study the effect of silicon nitride grain morphology and the nature of the grain boundary phase on the mechanical properties of silicon nitride ceramics. A complete study on sintering and grain growth has been conducted in two silicon nitride systems: SiAlON -- Y/sub 3/Al/sub 5/O/sub 12/ (YAG) and SiAlON -- Cordierite. The two additives, YAG and cordierite, were selected so that the liquid viscosity during sintering is relatively high in the cordierite system. Extensive kinetic characterization on densification, alpha and beta silicon nitride phase transformation and grain growth has been obtained with respect to sintering temperature and time, sialon composition, and liquid viscosity and content. The growth anisotropy of the /ss/ grain has been demonstrated and the possible mechanistic explanation have been addressed.

• Research Organization: Michigan Univ., Ann Arbor, MI (USA). Dept. of Materials Science and Engineering
• DOE Contract Number: FG02-84ER45069
• OSTI ID: 5676731
• Report Number(s): DOE/ER/45069-3; ON: DE89016787
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CRYSTAL STRUCTURE
CRYSTALLIZATION
DOCUMENT TYPES
FABRICATION
GRAIN BOUNDARIES
GRAIN GROWTH
MECHANICAL PROPERTIES
MICROSTRUCTURE
NITRIDES
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PNICTIDES
PROGRESS REPORT
SILICON COMPOUNDS
SILICON NITRIDES
SINTERING
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES