Phase Relations and Stability Studies in the Si3N4-SiO2-Y2O3 Pseudoternary System |
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| Authors: | F F LANGE S C SINGHAL R C KUZNICKI |
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| Affiliation: | Metallurgy and Metals Processing Section, R &D Center, Westinghouse Electric Corporation, Pittsburgh, Pennsylvania 15235 |
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| Abstract: | Composite powders were hot-pressed to determine the phase relations in the Si3N4-SiO2-Y2O3 pseudoternary system. Four quaternary compounds, Si3Y2O3N4, YSiO2N, Y10Si7O23N4, and Y4Si2O7N2, were identified. Studies of polyphase and single-phase materials in this system showed that these 4 compounds are unstable under oxidizing conditions. Materials within the Si3N4-Si2N2O-Y2Si2O7 compatibility triangle precluded the unstable compounds, and are extremely resistant to oxidation. |
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