Oxidation Behavior of Rare‐Earth Disilicate–Silicon Nitride Ceramics
- 1 August 1992
- journal article
- Published by Wiley in Journal of the American Ceramic Society
- Vol. 75 (8) , 2044-2049
- https://doi.org/10.1111/j.1151-2916.1992.tb04463.x
Abstract
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.Keywords
This publication has 11 references indexed in Scilit:
- Fabrication and Secondary‐Phase Crystallization of Rare‐Earth Disilicate–Silicon Nitride CeramicsJournal of the American Ceramic Society, 1992
- Oxidation of Silicon Nitride Sintered with Rare‐Earth Oxide AdditionsJournal of the American Ceramic Society, 1985
- Factors influencing structural evolution in the oxide of hot-pressed Si3N4-Y2O3-SiO2 materialsJournal of Materials Science, 1984
- Oxidation of Silicon Nitride Hot‐Pressed with CeriaJournal of the American Ceramic Society, 1981
- Kinetics of Oxidation of Hot‐Pressed Silicon Nitride Containing MagnesiaJournal of the American Ceramic Society, 1978
- The Rate Controlling Process in the Oxidation of Hot Pressed Silicon NitrideJournal of the Electrochemical Society, 1977
- Phase Relations and Stability Studies in the Si3N4‐SiO2‐Y2O3 Pseudoternary SystemJournal of the American Ceramic Society, 1977
- The silicon lanthanide oxynitridesJournal of Materials Science, 1976
- Thermodynamics and kinetics of oxidation of hot-pressed silicon nitrideJournal of Materials Science, 1976
- Polymorphism and crystal data of the rare-earth disilicates of type R.E.2Si2O7Journal of the Less Common Metals, 1970