Download Advanced Fibers for High-Temperature Ceramic Composites: by National Research Council, Division on Engineering and PDF

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 elements 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 homes of CMCs. This file outlines the cutting-edge 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 supply a context for discussing high-temperature ceramic fibers and coatings.

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FIGURE 3-8 Tensile strength of SiC fibers after aging for 10 hours at 1,550°C (2,822°F) in argon. , 1997. Exposure of polymer-derived non-oxide fibers to air or oxygen can result in rather dramatic decreases in roomtemperature strength (Figure 3-9 and Figure 3-10). In all cases, a passivating film of SiO2 is formed. , 10 weight-percent O2), however, the SiO2 films contain bubbles and pores, presumably caused by CO generation. The decrease in room-temperature strength after oxidation has been related to the thickness of the SiO2 film, suggesting that cracks in the oxide act as surface flaws that initiate fracture of the fiber.

Nevertheless, numerous gas turbine engine component demonstrations 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. Page breaks are true to the original; line lengths, word breaks, heading styles, and other typesetting-specific formatting, however, cannot be retained, and some typographic errors may have been accidentally inserted. Please use the print version of this publication as the authoritative version for attribution.

CERAMIC MATRIX COMPOSITE DESIGN AND LIFE PREDICTIONS Focusing on the CMC applications with the greatest potential for implementation requires placing CMCs within the broad spectrum of thermostructural materials. CMCs differ appreciably from structural metals, monolithic ceramics, and PMCs in their thermomechanical performance. Consequently, the strategies that govern design and life predication for CMCs are unique. The following guiding principles should facilitate the successful implementation of CMCs in targeted applications: • Applications for CMC components should have loading and thermal profiles that exploit the attributes of the material; applications that are sensitive to the weaknesses of the material should be avoided (see Table 2-1).

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