Oxidation Behavior of Rare-Earth Disilicate-Silicon Nitride Ceramics

The oxidation behavior and microstructure of the oxidized surfaces of RE2Si2O7–Si3N4 ceramics were investigated. The high oxidation resistance of these materials at 1400°C is attributed to the minimization of amorphous phases via devitrification to disilicates that are in equilibrium with SiO2, the...

Full description

Saved in:
Bibliographic Details
Published in:Journal of the American Ceramic Society 1992-08, Vol.75 (8), p.2044-2049
Main Authors: Cinibulk, Michael K., Thomas, Gareth, Johnson, Sylvia M.
Format: Article
Language:English
Subjects:
360202 - Ceramics, Cermets, & Refractories- Structure & Phase Studies
360204 - Ceramics, Cermets, & Refractories- Physical Properties
360205 - Ceramics, Cermets, & Refractories- Corrosion & Erosion
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
CHALCOGENIDES
Chemical industry and chemicals
CHEMICAL REACTIONS
CORROSION
CORROSION RESISTANCE
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DYSPROSIUM COMPOUNDS
DYSPROSIUM SILICATES
Exact sciences and technology
HEAT RESISTANT MATERIALS
IMPURITIES
MATERIALS
MATERIALS SCIENCE
MICROSTRUCTURE
NITRIDES
NITROGEN COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PNICTIDES
RARE EARTH COMPOUNDS
SILICATES
SILICON COMPOUNDS
SILICON NITRIDES
SILICON OXIDES
STRESS CORROSION
Structural ceramics
Technical ceramics
TEMPERATURE EFFECTS
TEMPERATURE RANGE
TEMPERATURE RANGE 1000-4000 K
THERMAL DEGRADATION
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The oxidation behavior and microstructure of the oxidized surfaces of RE2Si2O7–Si3N4 ceramics were investigated. The high oxidation resistance of these materials at 1400°C is attributed to the minimization of amorphous phases via devitrification to disilicates that are in equilibrium with SiO2, the oxidation product of Si3N4. Crystals of RE2Si2O7 grew out of the surface silicate in prefered orientations that were dictated by crystal structure. The morphology of the microstructure of the oxidized surfaces was shown to be partially dependent on the concentration of impurities; the presence of Ca was found to coincide with the growth of Gd2Si2O7 and Dy2Si2O7 crystals with high aspect ratios.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.1992.tb04463.x