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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 houses (strength, temperature and creep resistance, for example)-along with the debonding features in their coatings-determine the homes of CMCs. This document outlines the cutting-edge 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 offer a context for discussing high-temperature ceramic fibers and coatings.

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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. CURRENT AND FUTURE NEEDS 18 always be anticipated. Changes in fiber property requirements and expansion to higher volume production, however, create constant pressure to improve productivity and, hence, to implement processing changes.

And General Electric (Aviation Week, 1993). This technology has since been developed further by the replacement of traditional carbon fibers with SiC fibers and the addition of a SiC overcoat. SiC is inherently more resistant to oxidation than carbon and, therefore, retains strength and durability for a longer period of time in service. The oxidation-inhibited carbon matrix offers stiffness—and in the absence of oxidation— remarkable high-temperature mechanical properties. The SiC overcoat protects the composite from oxidation, as well as from other environmental threats.

In short, fiber failure strain requirements have not been rigorously defined (Evans, 1997). Although determining whether available fibers are adequate or inadequate for current CMC applications is impracticable without input from component and subelement testing, the following statements can be made: • Fibers must be microstructurally stable at Tmax for tm. 6 percent virtually assures robust behavior. • Enhancing the creep and rupture properties of fibers is undoubtedly beneficial, but explicit goals cannot be set until component testing is done.

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