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Phase Relations and Stability Studies in the Si 3 N 4 ‐SiO 2 ‐Y 2 O 3 Pseudoternary System
Author(s) -
LANGE F. F.,
SINGHAL S. C.,
KUZNICKI R. C.
Publication year - 1977
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1977.tb14118.x
Subject(s) - oxidizing agent , annealing (glass) , materials science , phase (matter) , phase diagram , analytical chemistry (journal) , compatibility (geochemistry) , crystallography , mineralogy , chemistry , metallurgy , organic chemistry , composite material , chromatography
Composite powders were hot‐pressed to determine the phase relations in the Si 3 N 4 ‐SiO 2 ‐Y 2 O 3 pseudoternary system. Four quaternary compounds, Si 3 Y 2 O 3 N 4 , YSiO 2 N, Y 10 Si 7 O 23 N 4 , and Y 4 Si 2 O 7 N 2 , 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 Si 3 N 4 ‐Si 2 N 2 O‐Y 2 Si 2 O 7 compatibility triangle precluded the unstable compounds, and are extremely resistant to oxidation.