High-temperature creep behavior of a SiOC glass ceramic free of segregated carbon
High-temperature creep behavior of a SiOC glass ceramic free of segregated carbon
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DOI：
10.1016/j.jeurceramsoc.2016.04.015
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发表时间：
2016-11
影响因子：
5.7
通讯作者：
C. Stabler;F. Roth;M. Narisawa;D. Schliephake;M. Heilmaier;S. Lauterbach;H. Kleebe;R. Riedel;E. Ionescu
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文献类型：
--
作者：
C. Stabler;F. Roth;M. Narisawa;D. Schliephake;M. Heilmaier;S. Lauterbach;H. Kleebe;R. Riedel;E. Ionescu
在这项研究中，我们提出了一个致密的SiOC玻璃陶瓷的高温蠕变行为的偏析的碳自由。固体核磁共振谱、X射线衍射和透射电镜研究表明，样品由均匀分散在无定形SiO2基体中的β-SiC纳米颗粒组成。压缩蠕变实验在1100-1300 °C和50-100 MPa的应力下进行。计算得到的SiOC的蠕变粘度比纯SiO2的蠕变粘度高两个数量级。而蠕变激活能（696 kJ/mol）接近纯石英玻璃中测定的。然而，计算出的应力指数为1.7，这表明除了牛顿粘性流动之外，其他机制可能有助于蠕变。SiOC玻璃陶瓷和无定形二氧化硅的蠕变速率和蠕变机制的强烈差异被讨论在二氧化硅基体和β-SiC纳米颗粒之间的界面的可能贡献。
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 50–100 MPa. The calculated creep viscosity of SiOC is two orders of magnitude higher than that of pure silica. Whereas the activation energy for creep (696 kJ/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.