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 homes (strength, temperature and creep resistance, for example)-along with the debonding features in their coatings-determine the houses of CMCs. This record outlines the state-of-the-art in high-temperature ceramic fibers and coatings, assesses fibers and coatings by way of destiny wishes, and recommends promising avenues of analysis. CMCs also are mentioned during this report back to supply a context for discussing high-temperature ceramic fibers and coatings.
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Extra resources for Advanced Fibers for High-Temperature Ceramic Composites: Advanced Materials for the Twenty-First Century
Unless specifically identified as a single-crystal fiber, oxide fibers are assumed to be polycrystalline. The nonoxide fibers discussed in this report are polycrystalline SiC fibers or multiphase (amorphous or crystalline) combinations of boron (B), carbon (C), nitrogen (N), titanium (Ti), or silicon (Si). Two monofilament fibers have been included in Table 3-1, Saphikon (single-crystal alumina) and SCS-6 (a multilayered C/SiC fiber produced by chemical vapor deposition on a carbon fiber substrate), both of which have been used extensively in research on CMCs.
Please use the print version of this publication as the authoritative version for attribution. STATE OF THE ART IN CERAMIC FIBER PERFORMANCE 27 fibers that do not have a significant amount of Si-O-C phase. That is, reducing the oxygen content of SiC fibers increases their resistance to microstructural degradation associated with high-temperature exposure. High temperature thermal exposure in argon shows very little affect on the room-temperature strength of the Dow Corning Sylramic fiber or the Carborundum fiber.
Greater than 1 percent). As the β-SiC grain size increases or the amorphous phase content decreases, the carbon content increases in some fibers (Hi-Nicalon, Tyranno Lox E) resulting in a decrease in strength and an increase in the modulus, thus sacrificing strain-to-failure. These microstructural changes are induced by (1) using a curing step during fiber processing that incorporates very little oxygen into the structure and (2) by conducting pyrolysis at higher temperatures. In the Tyranno family of non-oxide fibers, Ti was originally incorporated into the fiber during processing to create a very fine β-SiC grain size.
Advanced Fibers for High-Temperature Ceramic Composites: Advanced Materials for the Twenty-First Century 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