Phase Relations in the System Si 3 N 4 ‐SiO 2 ‐MgO and Their Interrelation with Strength and Oxidation
Author:
- 1 January 1978
- journal article
- Published by Wiley in Journal of the American Ceramic Society
- Vol. 61 (1-2) , 53-56
Abstract
Phase relation studies of Si 3 N 1 , SiO 2 , and MgO have established three important subsolidus tie lines, viz. Si 3 N 4 ‐MgO, Si 3 N 4 ‐Mg 2 SiO 4 , and Si 2 N 2 O‐Mg 2 SiO 4 for nonoxidizing fabrication conditions. Strength measurements at 1400°C show that optimum strengths are obtained for compositions approaching the Si 3 N 4 ‐MgO and Si 3 N 4 ‐Si 2 N 2 O tie lines and that inferior strengths are obtained for compositions approaching the Si 3 N 4 ‐Mg 2 SiO 4 tie line. Oxidation measurements at 1375°C show that the oxidation kinetics depend on the content of MgO and Mg 2 SiO 4 phases. Optimum oxidation resistance is observed for compositions approaching the Si 3 N 4 ‐Si 2 N 2 O tie line. Strength and oxidation results are discussed with regard to phase equilibrium considerations.Keywords
This publication has 13 references indexed in Scilit:
- Phase Relations and Stability Studies in the Si 3 N 4 ‐SiO 2 ‐Y 2 O 3 Pseudoternary SystemJournal of the American Ceramic Society, 1977
- Sialons and related nitrogen ceramicsJournal of Materials Science, 1976
- Crystal chemistry of β-Si3N4 solid solutions containing metal oxidesMaterials Research Bulletin, 1976
- Effect of selected impurities on the high temperature mechanical properties of hot-pressed silicon nitrideJournal of Materials Science, 1976
- Contribution to the Phase Diagram Si 3 N 4 ‐AlN‐Al 2 O 3 ‐SiO 2Journal of the American Ceramic Society, 1975
- Structural Approach to the Problem of Oxygen Content in Alpha Silicon NitrideJournal of the American Ceramic Society, 1975
- Re-examination of the crystal structure of α-Si3N4Materials Research Bulletin, 1974
- Oxygen content of reaction-bonded ?-silicon nitrideJournal of Materials Science, 1974
- A Study on the Sintered Si3N4-MgO SystemJournal of the Ceramic Association, Japan, 1973
- Ringwoodite, Natural (Mg,Fe)2SiO4 Spinel in the Tenham MeteoriteNature, 1969