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 major 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 homes of CMCs. This document 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 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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Extra info for Advanced Fibers for High-Temperature Ceramic Composites: Advanced Materials for the Twenty-First Century
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.
The SiC overcoat protects the composite from oxidation, as well as from other environmental threats. Engine flaps and seals made of this material have improved operating life by 900 percent over metal components (Wright Patterson Materials Directorate, 1995). Thousands of GE-F414 engine hours have been accumulated using this system, and this experience will add valuable information to the knowledge base. 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.
Please use the print version of this publication as the authoritative version for attribution. CURRENT AND FUTURE NEEDS 14 were successful, and one component for the F-119 engine achieved bill-of-materials status in pilot plant production. Recently, the Schott Corporation has set up a small plant in Germany that is producing glass matrix composite components for industrial applications. Their first implementation has been machine components for handling hot glass, and the company is beginning to expand its market.
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