Development of High-Efficiency, Continuous Process for Production and Surface Modification of Whiskers and Evaluation of Modified Whiskers as Composite material Element

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1. Carbon wisker was produced in a tubular flow reactor by feeding ferrocene, thiophene and benzene as the reactants.2. Fine iron particles produced from ferrocene were sulfurized with thiophene, and acted as the catalyst for carbon wisker. Carbonaceous precursor generated by cracking of benzene was dissolved in a molten catalyst particle, and deposited as a wisker at the opposite side of the particle. The wisker formation thus consisted of a sequence of different reactions, and reactant concentrations and reaction temperature has to be precisely controlled.3. The sulfur source was changed to hydrogen sulfide, which expanded reaction conditions for wisker formation. Various carbon sources were also tested.4. Catalyst particles were formed on the surface of granular carbon particles, which were fluidized by ascending gas. By applying the fluidized bed system, the residence time of wisker in the bed was freely controlled.. Carbon wisker was coated by a CVD method with SiC thin film that prevented the wisker from reaction with a matrix component.6. Aluminum borate wisker was coated with electroconductive tin oxide film.