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Influence of SiC/Silica and Carbon/Silica Interfaces on the High‐Temperature Creep of Silicon Oxycarbide‐Based Glass Ceramics: A Case Study
Author(s) -
Stabler Christina,
Schliephake Daniel,
Heilmaier Martin,
Rouxel Tanguy,
Kleebe HansJoachim,
Narisawa Masaki,
Riedel Ralf,
Ionescu Emanuel
Publication year - 2019
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201800596
Subject(s) - creep , materials science , composite material , ceramic , carbon fibers , phase (matter) , silicon , deformation (meteorology) , nanoparticle , composite number , nanotechnology , metallurgy , chemistry , organic chemistry
In the present study, the high‐temperature creep behavior of three SiOC glass ceramics with different phase compositions are compared by the authors. All three SiOC glass ceramics have a vitreous silica matrix in common, but comprise different homogeneously dispersed phases: 1) only spherical β‐SiC nanoparticles (sample denoted hereafter SiC/SiO 2 ), 2) only high‐aspect ratio sp 2 ‐hybridized carbon (i.e., C/SiO 2 ), and 3) both phases (SiC and segregated carbon, i.e., C/SiC/SiO 2 ). Compression creep experiments are performed at temperatures in the range between 1100 and 1300 °C and true stresses of 50 to 200 MPa. The determined activation energy for creep of the SiOC glass ceramics of around 700 kJ mol −1 is independent of the phase composition. A stress exponent value of approximately 2 indicates an interface‐controlled deformation mechanism. All SiOC glass ceramics exhibit significantly higher creep viscosities than that of vitreous silica. Surprisingly, the spherical β‐SiC nanoparticles have a higher impact on the effective creep viscosities of SiOC as compared to that of the high‐aspect ratio segregated carbon phase. It is concluded that this originates from the β‐SiC/silica and C/silica interfaces, which have different effects on the creep behavior of silicon oxycarbide‐based glass ceramics.