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Further development of chemical vapor deposition process for production of large diameter carbon-base monofilaments
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Richmond, R. D. Hough, R. L. |
| Copyright Year | 1974 |
| Description | The development of large diameter carbon-base monofilament in the 50 micron to 250 micron diameter range using the chemical vapor deposition process is described. The object of this program was to determine the critical process variables which control monofilament strength, monofilament modulus, and monofilament diameter. It was confirmed that wide scatter in the carbon substrate strength is primarily responsible for the scatter in the monofilament strength. It was also shown through etching experiments that defective substrate surface conditions which can induce low strength modular growth in the monofilament layers are best controlled by processing improvements during the synthesis of the substrate. Modulus was found to be linearily proportional to monofilament boron content. Filament modulus was increased to above 27.8MN/sq cm but only by a considerable increase in monofilament boron content to 60 wt. % or more. Monofilament diameter depended upon dwell time in the synthesis apparatus. A monofilament was prepared using these findings which had the combined properties of a mean U.T.S. of 398,000 N/sq cm, a modulus of 18.9 MN/sq cm (24,000,000 psi), and a diameter of 145 microns. Highest measured strength for this fiber was 451,000 N/sq cm (645,000 psi). |
| File Size | 1996024 |
| Page Count | 84 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19740011955 |
| Archival Resource Key | ark:/13960/t1qg3gk1f |
| Language | English |
| Publisher Date | 1974-02-01 |
| Access Restriction | Open |
| Subject Keyword | Machine Elements And Processes Chemical Tests Boron Carbon Fibers Vapor Deposition Composite Materials Reinforcement Structures Filaments Mechanical Properties Substrates Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
