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 most important 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 houses of CMCs. This record 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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Extra info for Advanced Fibers for High-Temperature Ceramic Composites: Advanced Materials for the Twenty-First Century
In each case, the CMC components must have the following attributes for a predetermined time: TABLE 2-4 Space Applications (United States) Type Program Integrated high performance missiles turbine engine technology Integrated high payoff space vehicles and rocket propulsion technology tactical missiles NASA reusable and space vehicles expendable launch vehicles satellites In-space propulsion Components combustors turbine rotors turbomachinery thrust chambers nozzles thrust chambers nozzles thermal protection maneuvering thrusters Typical Goals operating temperature > 1,400°C (2,552°F) very high temperature for short periods of time not available operating temperature > 1,700°C (3,092°F) for < 10 hrs 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.
Note that the room-temperature strengths shown in Figure 3-1 are lower than in Table 3-1 because the fiber gauge lengths used in the strength test reported in Figure 3-1 were much larger than the standard one inch length used for the FIGURE 3-1 Strength vs. temperature of SiC-based fibers and oxide fibers. , 1989. 375 GHZ — — Comments 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.
For composite applications, there are no explicit requirements on the ultimate tensile stress (UTS) of CMCs, although an implicit minimum UTS is dictated by stiffness requirements. Furthermore, there are no requirements for CMC toughness. , the reduction in net-section UTS upon notching the material). Notch performance is a benchmark for damage tolerance and can be used in the design of holes, slots, and attachments. Damage tolerance is controlled by the frictional characteristics of the interfaces, which is manifested in inelastic deformation.
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