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 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 offer 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
Rugg et al. (1995) have shown that failure of the Carborundum fiber at these stress levels in the 0 to 100 hour time frame is caused by slow crack growth and not creepinduced damage. Although the Carborundum fiber has about 50 percent of the room-temperature strength of the other fibers, it has about the same 100 hour rupture strength at 1,400°C (2,552°F). The behavior of the other fibers appears to be controlled by creep-generated flaws at higher temperatures and lower stresses, with a regime of slow crack growth at lower temperatures and higher stresses.
Changes in fiber property requirements and expansion to higher volume production, however, create constant pressure to improve productivity and, hence, to implement processing changes. , “frozen” in place). Overly restrictive quality control measures can stifle innovation, whereas uncontrolled process changes can lead to unanticipated performance degradation in end applications. Handleability and Processability CMC components have complex shapes, and because of their very low off-axis strength they require multiaxial fiber reinforcement.
FIGURE 3-9 Tensile strength of SiC fibers after exposure for 10 hours in dry air at 1,400°C (2,552°F). Source: Takeda, 1997. FIGURE 3-10 Tensile strength of SiC fibers after heat treatment at 1,000°C (1,832°F) in air. 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.