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Processing, Mechanical Properties, and Oxidation Behavior of Silicon Oxynitride Ceramics
Author(s) -
Ohashi Masayoshi,
Kanzaki Shuzo,
Tabata Hideyo
Publication year - 1991
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.1151-2916.1991.tb07305.x
Subject(s) - intergranular corrosion , materials science , phase (matter) , hot pressing , ceramic , silicon oxynitride , chemical engineering , silicon , liquid phase , metallurgy , microstructure , composite material , mineralogy , silicon nitride , chemistry , organic chemistry , thermodynamics , engineering , physics
Silicon oxynitride ceramics were prepared by hot‐pressing an equimolar Si 3 N 4 + SiO 2 mixture with 3 mol% CeO 2 . The Ce 2 O 3 /SiO 2 ratio of intergranular phase (liquid phase) increased as the formation of Si 2 N 2 O proceeded. The intergranular liquid remained as a glass on cooling until the Ce 2 O 3 /SiO 2 ratio exceeded a certain value, at which point the liquid crystallized. There were great differences in thermal and mechanical properties and oxideation behavior between the specimen containing intergranular glassy phase and the one containing intergranular crystalline phase (Ce 5 (SiO 4 ) 3 N–Ce 4.67 (SiO 4 ) 3 O). The specimen containing the intergranular glassy phase showed excellent hightemperature strength and oxidation resistance.