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

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

ISBN-10: 0309059968

ISBN-13: 9780309059961

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 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 analysis. 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 resources for Advanced Fibers for High-Temperature Ceramic Composites: Advanced Materials for the Twenty-First Century

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Please use the print version of this publication as the authoritative version for attribution. CURRENT AND FUTURE NEEDS 16 • heat exchangers for externally-fired combine cycles (EFCC) power systems, in which the hot air is supplied by a coal-fired heat exchanger and which must operate at approximately 1,400°C (2,552°F) in a coal slag environment for tens of thousands of hours • thermophotovoltaic (TPV) power systems for household appliances (gas-fired hot water heaters and furnaces that operate in times of electrical outages) and quiet generators for the recreational market (recreational vehicles, yachts), in which a ceramic composite with selective emission characteristics excites matched photovoltaic cells and which must operate at 1,400°C (2,552°F) to achieve the required power densities • reforming tubes for the chemical processing industry TABLE 2-3 Aircraft Applications a Country Program United States Integrated high performance turbine engine technology High speed civil United States transport Aircraft Type military Components combustor turbine exhaust nozzle commercial supersonic transport combustor exhaust nozzle NASA high temperature United States aircraft gas turbines various Advanced material gas generator Japan commercial transport compressor combustor turbine a Note Typical Goals operate at temperatures > 1,320°C (2,408°F) for > 1,000 hrs operate at temperatures > 1,600°C (2,192°F) for combustor operate at temperatures > 800°C (1,472°F) for nozzle time at temperature > 10,000 hrs operate at temperatures > 1,320°C (2,408°F) for > 1,000 hrs turbine inlet temperature of 1,600°C (2,912°F), with 20 percent efficiency improvement, 50 percent weight reduction, and 75 percentNOx reduction that this table is not a comprehensive representation of program goals.

In the Tyranno family of non-oxide fibers, Ti was originally incorporated into the fiber during processing to create a very fine β-SiC grain size. In the Tyranno ZM fiber and its derivatives, zirconium (Zr) is included to improve its hightemperature properties and resistance to NaCl corrosion. , creep resistance, strength retention, and oxidation resistance). 2 percent) content. The β-SiC grain size is about twice the grain size in Hi-Nicalon fiber. Thus, the strength of Hi-Nicalon S fiber is somewhat lower than Hi-Nicalon fiber, and the modulus approaches the modulus expected for fully crystalline SiC.

Unless specifically identified as a single-crystal fiber, oxide fibers are assumed to be polycrystalline. The nonoxide fibers discussed in this report are polycrystalline SiC fibers or multiphase (amorphous or crystalline) combinations of boron (B), carbon (C), nitrogen (N), titanium (Ti), or silicon (Si). Two monofilament fibers have been included in Table 3-1, Saphikon (single-crystal alumina) and SCS-6 (a multilayered C/SiC fiber produced by chemical vapor deposition on a carbon fiber substrate), both of which have been used extensively in research on CMCs.

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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


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