By National Research Council, Division on Engineering and Physical Sciences, National Materials Advisory Board, Commission on Engineering and Technical Systems, Committee on Advanced Fibers for High-Temperature Ceramic Composites
High-temperature ceramic fibers are the main parts of ceramic matrix composites (CMCs). Ceramic fiber houses (strength, temperature and creep resistance, for example)-along with the debonding features in their coatings-determine the houses of CMCs. This file outlines the state-of-the-art in high-temperature ceramic fibers and coatings, assesses fibers and coatings when it comes to destiny wishes, and recommends promising avenues of study. CMCs also are mentioned during this report back to offer a context for discussing high-temperature ceramic fibers and coatings.
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Extra info for Ceramic Fibers and Coatings: Advanced Materials for the Twenty-First Century
The Sylramic fiber is much stronger than other stoichiometric SiC fibers. The high-temperature properties of this fiber are superior to finer grain size, carbon-containing, polymer-derived SiC-based fibers. The University of Florida, in collaboration with 3M, has developed a potentially lower cost, dry spun polymer-derived analogue of Hi-Nicalon fiber. It appears that this process can produce the same microstructural evolution that produced the high-performance Nicalon/Hi-Nicalon family of SiC fibers.
Source: Kumagawa, 1997. The reasons for the lower strengths of CVD SiC fibers after heat treatment have been debated for more than 25 years. For CVD fibers deposited on a carbon fiber core, the most likely explanation for the dramatic drop in strength is the melting and volatilization of free silicon in the fiber. However, larger grains of α-SiC have been found on some fracture surfaces after heat treatments at 1,500°C (2,732°F) and higher, suggesting that transformation of β-SiC to α-SiC with accompanying exaggerated grain growth—is the cause of reduced strength.
This fiber is also unusually resistant to oxidation (for a non-oxide fiber), producing only a 1µm thick oxide film after 48 hours of exposure to air at 1,500°C (2,732° F) (Figure 3-11). Another interesting aspect of this fiber is the hexagonal BN (h-BN) interlayer that forms in situ under the SiO2 film. This interlayer appears to act as a crack deflector much the way a CVD BN film does (Baldus, 1997). However, the remarkable strength retention and creep resistance of the Bayer fiber About this PDF file: This new digital representation of the original work has been recomposed from XML files created from the original paper book, not from the original typesetting files.