RESEARCH ON STRUCTURE CHARACTERIZATION OF CONTINUOUS FILAMENT MATERIALS.
Abstract
Characterization studies of vapor deposited boron carbide, titanium diboride, and silicon carbide filaments were performed. Boron carbide, with maximum strengths of around 100,000 psi, contained large amounts of pyrolytic graphite. Titanium diboride had a coating of TiB2 on the substrate but only had maximum strengths of 140,000 psi. Silicon carbide, consisting primarily of a fine grained polycrystalline Beta-SiC coating on a W substrate, could be produced having 300,000 psi failure stresses but the highest strengths (385,000 psi) were achieved with a boron dopant. Thermal exposures of SiC filaments to temperatures in excess of 1000C for short periods of time in an inert argon atmosphere can reduce the failure strengths from over 300,000 psi to below 100,000 psi. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1967
- Accession Number
- AD0825257
Entities
People
- G. N. Mcinnis
- R. P. I. Adler
- T. R. Cass
- W. R. Spencer