Program to Study SIC Fiber Reinforced Glass Matrix Composites.
Abstract
Glass-ceramic composites reinforced with SiC fibers have been fabricated that exhibit good strength properties from RT to 1000 C. In particular, a lithium-aluminum-silicate (LAS) matrix reinforced with SiC yarn has been shown to possess bend strengths of over 690 MPa (100 ksi) from RT to 800 C. However, the TiO2 nucleating agent present in the usual LAS materials can cause matrix crystallization during hot-pressing and fiber-matrix interactions, making the fabrication of consistently high strength composites extremely difficult. The substitution of ZrO2 for the TiO2 appears to have eliminated this problem. Composites fabricated from SiC monofilament with a magnesium-aluminum-silicate (MAS) matrix have also exhibited high strengths from RT to 1000 C. Again, however, consistent fabrication of reproducibly high strength composites has been difficult due to lack of wetting and bonding between the SiC fibers and the matrix. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 15, 1979
- Accession Number
- ADA077638
Entities
People
- J. J. Brennan
Organizations
- United Technologies Corporation