Grain boundary phases in a hot-pressed MgO fluxed silicon nitride

Journal Article · Mon Oct 31 23:00:00 EST 1977 · J. Am. Ceram. Soc.; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1977.tb14089.x· OSTI ID:6824915

Clarke, D R; Thomas, G

Although high-temperature strength loss in ceramics, such as silicon nitride, has been attributed to the presence of intergranular amorphous phases, until now no direct proof has been offered. This paper describes high resolution electron microscopy lattice imaging studies of an MgO fluxed hot-pressed silicon nitride. These studies indicate that intergranular second phases do indeed exist, but they are heterogeneously distributed, appearing especially at multiple grain junctions. These room temperature observations are compatible with the microstructures expected at elevated temperatures.

• Research Organization: Univ. of California, Berkeley
• OSTI ID: 6824915
• Journal Information: J. Am. Ceram. Soc.; (United States), Journal Name: J. Am. Ceram. Soc.; (United States) Vol. 60:11-12; ISSN JACTA
• 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
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
CRYSTAL STRUCTURE
FABRICATION
GLASS
GRAIN BOUNDARIES
HOT PRESSING
LATTICE PARAMETERS
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MATERIALS WORKING
MICROSTRUCTURE
NITRIDES
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PNICTIDES
PRESSING
SILICON COMPOUNDS
SILICON NITRIDES