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Preceramic Polymers for Use as Fiber CoatingsPolymeric precursors to Si-C-O, SI-B-N and Si-C were evaluated for use as ceramic interfaces in ceramic matrix composites. Use of the preceramic polymers allows for easy dip coating of fibers from dilute solutions of a polymer, which are then pyrolyzed to obtain the ceramic. SCS-0 fibers (Textron Specialty Materials, Lowell, MA) were coated with polymers from three systems: polysilsesquioxanes, polyborosilazanes and polycarbosilanes. The polysilsesquioxane systems were shown to produce either silicon oxycarbide or silicon oxynitride, depending on the pyrolysis conditions, and demonstrated some promise in an RBSN (reaction-bonded silicon nitride) matrix model system. Polyborosilazanes were shown, in studies of bulk polymers, to give rise to oxidation resistant Si-B-N ceramics which remain amorphous to temperatures of 1600 C, and should therefore provide a low modulus interface. Polycarbosilanes produce amorphous carbon-rich Si-C materials which have demonstrated oxidation resistance.
Document ID
Document Type
Conference Paper
Heimann, P. J.
(Cleveland State Univ. Cleveland, OH United States)
Hurwitz, F. I.
(NASA Lewis Research Center Cleveland, OH United States)
Wheeler, D.
(NASA Lewis Research Center Cleveland, OH United States)
Eldridge, J.
(NASA Lewis Research Center Cleveland, OH United States)
Baranwal, R.
(Michigan Univ. Ann Arbor, MI United States)
Dickerson, R.
(Case Western Reserve Univ. Cleveland, OH United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1996
Subject Category
Composite Materials
Report/Patent Number
NAS 1.15:111755
Meeting Information
Composites, Advanced Ceramics, Materials and Structures(Cocoa Beach, FL)
Accession Number
Funding Number(s)
Distribution Limits
Work of the US Gov. Public Use Permitted.
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