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Development of silicon nitride composites with continuous fiber reinforcement [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 1993.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
25 pages : digital, PDF file
Additional Creators
Oak Ridge National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
The composites were fabricated using ultrafine Si powders prepared by attritor milling; the powders exhibits full conversion to Si nitride in < 3 h at ≤ 1200 C (these conditions reduce degradation of the fibers compared to conventional). Effects of processing conditions on fiber properties and the use of fiber coatings to improve stability during processing as well as change the fiber-matrix interfacial properties were investigated. A duplex carbon-silicon carbide coating, deposited by CVD, reduced fiber degradation in processing, and it modified the fiber-matrix adhesion. Si nitride matrix composites were fabricated using reaction sintering, forming laminates, filament-wound plates, and tubes. In each case, an attritor milled Si powder slurry is infiltrated into ceramic fiber preforms or tows, which are then assembled to form a 3-D structure for reaction sintering. The resulting composites have properties comparable to chemical vapor infiltration densified composites, with reasonable strengths and graceful composite fracture behavior.
Report Numbers
E 1.99:ornl/sub--87-00184/04
ornl/sub--87-00184/04
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
10/01/1993.
"ornl/sub--87-00184/04"
"DE94001996"
Lackey, W.J.; Starr, T.L.; Mohr, D.L.; Hanigofsky, J.A.
Type of Report and Period Covered Note
Interim; 10/01/1993 - 10/01/1993
Funding Information
AC05-84OR21400
View MARC record | catkey: 14456097