Published August 1992
| Version v1
Journal article
Oxidation behavior of rare-earth disilicate-silicon nitride ceramics
Creators
- 1. Lawrence Berkeley Lab., CA (United States). Center for Advanced Materials
- 2. SRI International, Menlo Park, CA (United States). Materials Research Lab.
Description
In this paper, the oxidation behavior and microstructure of the oxidized surfaces of RE2Si2O7-Si3N4 ceramics are investigated. The high oxidation resistance of these materials at 1400 degrees 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 surfaces silicate in preferred 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
Additional details
Publishing Information
- Journal Title
- Journal of the American Ceramic Society
- Journal Volume
- 75
- Journal Issue
- 8
- Journal Page Range
- p. 2044-2049.
- ISSN
- 0002-7820
- CODEN
- JACTAW
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 24022151
- Subject category
- S36: MATERIALS SCIENCE; S36: MATERIALS SCIENCE; S36: MATERIALS SCIENCE;
- Descriptors DEI
- CORROSION RESISTANCE; CRYSTAL LATTICES; DYSPROSIUM SILICATES; IMPURITIES; MICROSTRUCTURE; OXIDATION; RARE EARTH COMPOUNDS; SILICON NITRIDES; SILICON OXIDES; STRESS CORROSION; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 1000-4000 K; THERMAL DEGRADATION
- Descriptors DEC
- CHALCOGENIDES; CHEMICAL REACTIONS; CORROSION; CRYSTAL STRUCTURE; DYSPROSIUM COMPOUNDS; NITRIDES; NITROGEN COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; PNICTIDES; SILICATES; SILICON COMPOUNDS; TEMPERATURE RANGE
Optional Information
- Funding organization
- National Science Foundation, Washington, DC (United States).