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The distribution of graphene units with an axial symmetry gives rise to different types of carbon filaments: nanotubes, nanofilaments and classical fibers. In this work the surfaces of different multiwalled nanotubes are characterized by two complementary techniques: chemical ones based on Total Surface Area and Active Surface Area measurements, associated with a physical approach the Raman scattering...
Fast densification processes have been developed to improve the fabrication of C/C composite materials. In this work, a comparison is made between two techniques: the film boiling technique with a liquid reagent and the gas infiltration method. In both methods, the same home-made reactor was used. For the film boiling technique, the preform is either wrapped or not with a porous thermal barrier.Two...
Several chemical vapor infiltration (CVI) processes have been developed to increase both the carbon yield and the densification rate for a controlled type of pyrocarbon deposit. Recently, the 'film boiling technique' (so-called Kalamazoo) has been successfully developed for making in particular C/C composite materials. To get a better insight on this process, we have built up two small laboratory...
Several amorphous carbonitride films have been elaborated by plasma enhanced chemical vapor deposition. A radio frequency discharge has been used under standard conditions with different graphitic nitrogenated compounds. It is shown that the influence of molecular precursor is important concerning in particular the magnetic properties. The films issued from pyrrole and cyanuric chloride exhibit a...
The final quality of carbon/carbon composite materials depends strongly on the tight fit of the components. This could be predicted with a better knowledge of the intrinsic thermal and mechanical behavior of the carbon fibers. With this object, we have built-up an experimental set-up for in situ studying of dimensional variations and the bending strain at failure of single filaments from high tensile...
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