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Microstructural development of macroporous silicon carbide ceramics during annealing
엄정혜,Masaki Narisawa,김영욱 한양대학교 세라믹연구소 2008 Journal of Ceramic Processing Research Vol.9 No.2
Macroporous silicon carbide ceramics with porosities ranging from 67% to 84% were fabricated by a carbothermal reduction process from a carbon-filled polysiloxane and subsequent annealing. Microstructural development during annealing was investigated using scanning electron microscopy (SEM). The grain size increased with an increase in the annealing time and the morphology changed from equiaxed to cube or hexagonal platelets depending on the annealing temperature. By controlling the annealing time and annealing temperature, it was possible to adjust the size and morphology of SiC grains in macroporous SiC ceramics.
High-temperature creep behavior of a SiOC glass ceramic free of segregated carbon
Stabler, Christina,Roth, Felix,Narisawa, Masaki,Schliephake, Daniel,Heilmaier, Martin,Lauterbach, Stefan,Kleebe, Hans-Joachim,Riedel, Ralf,Ionescu, Emanuel Elsevier 2016 Journal of the European Ceramic Society Vol.36 No.15
<P><B>Abstract</B></P> <P>In this study we present the high-temperature creep behavior of a dense SiOC glass ceramic free of segregated carbon. Solid-state NMR spectroscopy, XRD and TEM investigations indicate that the sample consists of β-SiC nanoparticles homogeneously dispersed in an amorphous silica matrix. Compression creep experiments were performed at 1100–1300°C and stresses of 50–100MPa. The calculated creep viscosity of SiOC is two orders of magnitude higher than that of pure silica. Whereas the activation energy for creep (696kJ/mol) is close to that determined in pure silica glass. However, a stress exponent of 1.7 was calculated, suggesting that other mechanisms might contribute to the creep in addition to the Newtonian viscous flow. The strong difference in the creep rates and creep mechanism of the SiOC glass ceramic and amorphous silica is discussed in terms of possible contributions of the interface between the silica matrix and the β-SiC nanoparticles.</P>