Continuous Fiber Ceramic Composite Program

CONTINUOUS FIBER CERAMIC COMPOSITE PROGRAM

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CFCC Program Participants

AlliedSignal Ceramic Components
This team is developing methods for the fabrication of a CFCC low-heat-rejection diesel engine exhaust valve guide that is self-lubricating. The material consists of a chopped carbon fiber-reinforced silicon nitride ceramic composite. Researchers use cold isostatic pressing to form the composite valve guides and glass encapsulation hot isostatic pressing to densify them. (Douglas Twait, 310/512-2608, doug.twait@alliedsignal.com.): - AlliedSignal Ceramic Components Homepage

AlliedSignal Composites, Inc.
One team is constructing silicon carbide CFCC components using a chemical vapor infiltration (CVI) process including joining of CFCCs. A second team is fabricating silicon carbide and alumina fiber-reinforced alumina matrix composites using the directed metal oxidation process (DIMOX™ ). Components under consideration include CFCC heat exchanger tubes, gas turbine combustor liners and shrouds, porous radiant surface burner reverberatory screens, and thin sheet recuperator elements. (Phillip Craig, 302/456-6577, phil.craig@alliedsignal.com)

- see CFCC News No. 9, 1997, pp 1-3.

- AlliedSignal Composites, Inc. Homepage

Dow Corning Corporation
Dow Corning's team uses a versatile polymer impregnation and pyrolysis process to fabricate large, complex-shaped composites. CFCC components fabricated by this process, such as gas turbine combustor liners, interstage seals, and pipe hangers, exhibit high strength and tough composite behavior to 2200°F. (Andrew Szweda, 517/496-4558, aszweda@cern.e-mail.com): - see CFCC News No. 9, 1997, pp 8-11.; - see CFCC News No. 6, 1996, pp 7.; - see CFCC News No. 5, 1994, pp 5-8.; - Dow Chemical Company Homepage

General Electric Company
The GE industry team is developing a Toughened Silcomp™ ceramic composite material consisting of continuous silicon carbide fibers in a matrix of silicon carbide and silicon. The material's lack of porosity gives the composite good oxidation resistance and thermal and mechanical properties. This CFCC material is well suited for land-based gas turbine combustor liners and shrouds. (Krishan L. Luthra, 518/387-6348, luthra@crd.ge.com): - see CFCC News No. 7, 1996, pp 6-9.; - GE Research and Development Homepage

McDermott Technologies, Inc.
McDermott's team uses a powder slurry and sol-gel impregnation process (a liquid precursor converted to solids). This technique is ideal for oxide-based composite systems and allows scaling for cost-effective manufacturing operations. Applications include CFCC gas turbine combustor liners, heat exchanger tubes, hot gas filters, and boiler components. (Richard Goettler, 804/552-6418, richard.w.goettler@mcdermott.com): - see CFCC News No. 9, 1997, pp 4-7.; - see CFCC News No. 7, 1996, pp 10-11.; - see CFCC News No. 4, 1994, pp 5-8.

Oak Ridge National Laboratory
ORNL and universities conduct generic research in the areas of environmental testing, interface development, and codes and standards. They develop the necessary supporting technologies to design, analyze, and test the materials, processing methods, and components under development in the CFCC Program. (Michael Karnitz, 423/574-5150, karnitzma@ornl.gov): - Performance-Related Phenomena (PDF file); - Fundamental Research and Development (PDF file); - Materials Characterization (PDF file); - Tube Testing; - Macromechanical Models; - Oak Ridge National Laboratory Homepage

Textron Systems
This team is developing and demonstrating the use of silicon carbide reinforcing fibers in a nitride-bonded silicon carbide matrix to fabricate tubular structures. These tubes may be coated or infiltrated, if necessary, to enhance durability. The CFCC tubes are targeted for use in metals melting and handling, furnace radiant heaters, and combustion components for small stationary gas turbines. (William Darden, 978/452-8961, wdarden@systems.textron.com): - Gaseous Nitradation; - see CFCC News No. 8, 1997, pp 1-3, 19.; - see CFCC News No. 6, 1995, pp 1-2.; - see CFCC News No. 5, 1994, pp 9-11.; - Textron Systems-Advanced Materials

|| Metal & Ceramics Div. || Oak Ridge National Laboratory || DOE-OIT

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Last Updated, 18-February-1999 mgc@ornl.gov