Ceramic Matrix Composites
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This is an example of the 'GE Store'—the transfer of technology and knowledge between GE businesses," Vartuli explained. CFCC companies brought materials they'd made to DOE national laboratories at Argonne for nondestructive evaluation and Oak Ridge for microstructural characterization and stress and oxidation tests. We provide necessary information to help the community make decisions about where to go, how to proceed.
Research at ORNL ranged from development by Allen Haynes of environmental barrier coatings that could extend the lives of underlying materials five-fold to nondestructive imaging of materials with thermal cameras by Ralph Dinwiddie. At Argonne National Laboratory, Bill Ellingson led development of broader nondestructive testing methods to ensure safe continued use of components by monitoring material degradation after intervals of usage. Without damaging the components, the inspections revealed how materials responded in an environment over time.
ORNL-led DOE program supported GE R&D of first widely deployed CMC product
With ORNL researchers, Argonne scientists developed several nondestructive inspection technologies that were instrumental in determining component performance. Lin stressed materials in environmental exposure chambers to learn their points of failure. Lab colleagues Jim Keiser and Irv Federer exposed samples to corrosive gases, temperatures up to F and pressures up to psi in "Keiser rigs" that simulated conditions in turbines. These were also used by More, Tortorelli and Keiser to screen protective coatings needed in combustion environments. Meanwhile, More characterized structures of stressed materials.
ORNL's early findings encouraged industry to abandon carbon as a fiber coating. Carbon oxidized, turning into carbon monoxide and carbon dioxide, and volatilized, thinning the coating. ORNL engineers recommended oxidation-resistant boron nitride instead. In collaboration with Matt Ferber and Chun-Hway Hsueh, he implemented experimental and analytical methods to characterize the micromechanics of fiber—matrix interfaces.
Ceramic Matrix Composite jobs
He and Hsueh provided key information about how a single fiber slides in a ceramic matrix. Lara-Curzio, Ferber and Lowden then quantified the effect of the thickness of fiber coatings on sliding and discovered a value that optimized mechanical properties. Companies widely adopted this correlation to optimize their composites. To achieve this vision, the community has many technological mountains to climb.
One is developing manufacturing processes that, unlike melt infiltration, do not produce excess silicon that can volatilize and form cracks in the matrix. To highlight these challenges, the U. Advanced Ceramics Association is creating an industry-driven roadmap for the development of F CMCs for advanced gas turbines. USACA's roadmap supports findings of a recent National Academy of Sciences study that concludes investment in gas turbine materials and coatings should be a high priority and that F CMCs could dramatically reduce or eliminate the need for cooling in engines, boost efficiency and lower weight.
DOE national labs may once again be called upon to help discover high-performance materials and processes that can operate at higher temperatures and even more extreme environments. Future CMCs will have to endure extremes on four time scales, depending on the application: 1 hour or less of hot time for launch vehicles; days for accident-tolerant fuels e.
A land-based gas turbine to generate electricity can be more demanding than an aircraft engine application because it spends much more time operating at high temperature, Luthra said. Advances in the next generation of F materials would enable breakthrough improvements in efficiency and emissions that could lower the cost of electricity. The sky, after all, may not be the limit.
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You can unsubscribe at any time and we'll never share your details to third parties. Oxidation is therefore not a problem in this application. The reduction of manufacturing costs will decide the success of this application for middle-class cars. Conventional SiC, or sometimes the less expensive SiSiC , have been used successfully for more than 25 years in slide or journal bearings of pumps.
Very good corrosion resistance against practically all kinds of media, and very low wear and low friction coefficients are the basis of this success. These bearings consist of a static bearing, shrink-fitted in its metallic environment, and a rotating shaft sleeve, mounted on the shaft. A picture of such shaft sleeves is shown at the top of this article.
This bearing system has been tested in pumps for liquid oxygen , for example in oxygen turbopumps for thrust engines of space rockets, with the following results. Tests have shown that the friction coefficient is half, and wear one fiftieth of standard metals used in this environment. From Wikipedia, the free encyclopedia. Journal of the European Ceramic Society.
Cooke Journal of the American Ceramic Society. Kumagawa; H. Yamaoka; M Shibuysa; T. Ymamura Ceramic Engineering and Science Proceedings. Naslain; F. Langlais; R. Fedou Journal de Phys. Probst; T. Besman; D. Stinton; R. Lowden; T. Anderson; T. Starr Surface and Coatings Technology. Ziegler; I. Richter; D. Suttor Kotani; Y. Katoh; A.
Khyama Journal of the Ceramic Society of Japan. Rocha; C. Cairo; M. Graca Materials Science and Engineering: A. Krenkel Simon International Journal of Applied Ceramic Technology. Pritzkow Stoll; P. Mahr; H. Krueger; H. Kern; R. Boccaccini Key Engineering Materials. Bao; P. Nicholson; F. Zok Raether Ceramic Applications. Pfeiffer, K. Lange, M. Dogigli, M.
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Ceramic-Matrix Composites | Machine Design
Sun More; P. Tortorelli; L. Walker; J.