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Microstructure and Creep Behavior of a Si 3 N 4 –SiC Micronanocomposite
Author(s) -
Kašiarová Monika,
Shollock Barbara,
Boccaccini Aldo,
Dusza Jan
Publication year - 2009
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.1551-2916.2008.02848.x
Subject(s) - creep , materials science , microstructure , grain boundary , intergranular corrosion , composite material , grain boundary sliding , precipitation , phase (matter) , amorphous solid , activation energy , crystallography , chemistry , physics , organic chemistry , meteorology
The microstructure and its influence on the creep behaviour of carbon derived Si 3 N 4 ‐SiC micro/nanocomposite tested in bending at temperatures from 1200° to 1400°C in air has been studied. No phase and microstructure change after creep test implied that material is stable at tested temperature range. After creep test only partial crystallization of glassy intergranular phase has been observed. Creep parameters n close to 1, apparent activation energy around 350 kJ/mol together with TEM observation indicated that the main creep mechanisms is solution precipitation controlled by interface reaction in combination with grain boundary sliding caused by the amorphous intergranular phases present in microstructure. However, the grain boundary sliding is hindered by local SiC particles interlocking neighboring Si 3 N 4 grains.