The relations between chemical vapor deposition (CVD) parameters and the resultant pyrolytic carbon microstructures have been examined for matrix deposition in fibrous carbon substrates. The parameters considered are temperature (1200-145O"C), pressure (20-630 Torr), C/H ratio (l/4-1/14), total flow
222. Chemical vapor deposition of carbon matrices
โ Scribed by T. Jachlewski; R.J. Diefendorf
- Publisher
- Elsevier Science
- Year
- 1982
- Tongue
- English
- Weight
- 143 KB
- Volume
- 20
- Category
- Article
- ISSN
- 0008-6223
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โฆ Synopsis
The work-of-fracture (ywOF) of carbon-carbon composites was measured for composites with 3-D woven fiber preforms, carbon felts, and chopped fibers. Maximum values were observed for the 3-D preforms and minimum values for the carbon felts. The values are also compared with similar data for graphites and glassy carbon.
๐ SIMILAR VOLUMES
AASTRACTS 331 ment. The electron microscope (both in the scanning and transmission modes) was used to examine the topography of both wet (60% HNOs, 118ยฐC) and dry oxidized (air, 700ยฐC) fibers as well as fracture surfaces of composites made with treated and untreated fibers. The flexural strength of
## Abstrad-Tensile tests have been performed on carbon/carbon composites made from carbon cloths and a pyrolytic carbon matrix and their failure surfaces were examined by scanning electron microscopy. The load-extension curves are characterized by three distinct regions: the applied load needed to