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Creep Viscosity and Stress Relaxation of Gel‐Derived Silicon Oxycarbide Glasses
Author(s) -
Rouxel Tanguy,
Soraru GianDomenico,
Vicens Jean
Publication year - 2001
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.1151-2916.2001.tb00789.x
Subject(s) - materials science , creep , viscosity , stress relaxation , relaxation (psychology) , temperature dependence of liquid viscosity , crystallization , rheology , atmospheric temperature range , hardening (computing) , thermodynamics , composite material , relative viscosity , psychology , social psychology , physics , layer (electronics)
The temperature dependence of the viscosity and stress‐relaxation kinetics of sol–gel‐derived SiOC glasses that contain up to 14 at.% carbon have been characterized in the temperature range of 1000°–1400°C. The viscosity, as determined from relaxation experiments, is in good agreement with the creep viscosity and is typically two orders of magnitude higher than the viscosity of vitreous silica. However, materials suffer from partial crystallization at >1150°C, and the precipitation of β‐SiC nanocrystals induces a flow‐hardening behavior and results in a dynamic increase in viscosity, especially at >1200°C and for glasses with a high carbon content.