Accession Number : ADA303686

Title :   Additional Development of Large Diameter Carbon Monofilament.

Descriptive Note : Contract rept. Jun 73-Feb 74,

Corporate Author : UNITED AIRCRAFT RESEARCH LABS EAST HARTFORD CT

Personal Author(s) : Jacob, B. A. ; Veltri, R. D.

PDF Url : ADA303686

Report Date : FEB 1974

Pagination or Media Count : 91

Abstract : The chemical vapor process for preparing a large diameter carbon-base monofilament from a BCl3, CH4 and H2 gas mixture with carbon substrate fiber was further studied. The effects of reactor geometry, total gas flows and deposition temperature on the tensile strength of the monofilament were investigated. (it was noted that consistent results could only be obtained when the carbon substrate fiber was cleaned. The strength of the monofilament was found to depend on the highest temperature and the temperature profile of the monofilament in the reactor. The strength of monofilament produced in the DC and RF reactors were found to be similar and similar alloy compositions in the monofilament were attained when the same gas ratios were used. The tensile strength of the monofilament at 500 deg C was found to be 60 to 70% of the room temperature tensile strength. No degradation was noted after exposure to molten aluminum. jg p2

Descriptors :   *CHEMICAL VAPOR DEPOSITION, *CARBON FIBERS, *FILAMENTS, *BORON, DIAMETERS, TENSILE STRENGTH, DEGRADATION, EXPOSURE(GENERAL), HIGH TEMPERATURE, MELTS, SUBSTRATES, ALLOYS, ROOM TEMPERATURE, HYDROGEN, ALUMINUM, CHEMICAL REACTIONS, STRENGTH(GENERAL), CHLORIDES, METHANE, COMPOSITION(PROPERTY), DIRECT CURRENT, RADIOFREQUENCY, GAS FLOW, REACTOR OPERATION.

Subject Categories : Inorganic Chemistry
      Laminates and Composite Materials
      Textiles

Distribution Statement : APPROVED FOR PUBLIC RELEASE