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Jianfeng Huang - One of the best experts on this subject based on the ideXlab platform.

  • yttrium silicate oxidation protective coating for sic coated Carbon Carbon Composites
    Ceramics International, 2006
    Co-Authors: Jianfeng Huang, Xierong Zeng
    Abstract:

    Abstract Four kinds of yttrium silicate oxidation protective coatings SiO 2 ·Y 2 O 3 , 1.5SiO 2 ·Y 2 O 3 , 1.5SiO 2 ·Y 2 O 3 /SiO 2 ·Y 2 O 3 and 2SiO 2 ·Y 2 O 3 /1.5SiO 2 ·Y 2 O 3 /SiO 2 ·Y 2 O 3 were prepared by plasma spray on the surface of SiC pre-coated Carbon/Carbon Composites. The structures of the coatings were characterized by XRD, SEM and EDS analyses. It was shown that the gradied 2SiO 2 ·Y 2 O 3 /1.5SiO 2 ·Y 2 O 3 /SiO 2 ·Y 2 O 3 multi-layer coating had better high-temperature oxidation resistance. It could protect Carbon/Carbon Composites from oxidation at 1773 K in air for 73 h with a weight loss of less than 2%. The oxidation activation energy of the coated Carbon/Carbon Composites is 87.3 kJ/mol, and the oxidation process in C/C substrates with a multi-layer coating was controlled by the rate of oxygen diffusion through the holes in the coating.

Xierong Zeng - One of the best experts on this subject based on the ideXlab platform.

  • yttrium silicate oxidation protective coating for sic coated Carbon Carbon Composites
    Ceramics International, 2006
    Co-Authors: Jianfeng Huang, Xierong Zeng
    Abstract:

    Abstract Four kinds of yttrium silicate oxidation protective coatings SiO 2 ·Y 2 O 3 , 1.5SiO 2 ·Y 2 O 3 , 1.5SiO 2 ·Y 2 O 3 /SiO 2 ·Y 2 O 3 and 2SiO 2 ·Y 2 O 3 /1.5SiO 2 ·Y 2 O 3 /SiO 2 ·Y 2 O 3 were prepared by plasma spray on the surface of SiC pre-coated Carbon/Carbon Composites. The structures of the coatings were characterized by XRD, SEM and EDS analyses. It was shown that the gradied 2SiO 2 ·Y 2 O 3 /1.5SiO 2 ·Y 2 O 3 /SiO 2 ·Y 2 O 3 multi-layer coating had better high-temperature oxidation resistance. It could protect Carbon/Carbon Composites from oxidation at 1773 K in air for 73 h with a weight loss of less than 2%. The oxidation activation energy of the coated Carbon/Carbon Composites is 87.3 kJ/mol, and the oxidation process in C/C substrates with a multi-layer coating was controlled by the rate of oxygen diffusion through the holes in the coating.

Elodie Fourré - One of the best experts on this subject based on the ideXlab platform.

  • Non Thermal Plasma Functionalized 2D Carbon-Carbon Composites as Supports for Co Nanoparticles
    Plasma Chemistry and Plasma Processing, 2014
    Co-Authors: Julien Souquet-grumey, Philippe Ayrault, Olivier Heintz, Joël Barrault, Jean-michel Tatibouët, Hervé Plaisantin, Jacques Thébault, Sabine Valange, Elodie Fourré
    Abstract:

    Novel two-dimensional Carbon-Carbon Composites made of Carbon nanofibers (CNFs) supported on a Carbon preform were functionalized by non thermal plasma treatment (room temperature, atmospheric pressure, humid air), before being used as supports for metallic cobalt nanoparticles. It was shown that the degree of functionalization of the Carbon nanofibers depends on the plasma power input, the treatment time and the CNF loading. The size of the cobalt nanoparticles generated after subsequent reduction of the Co-containing plasma treated CNF/C Composites under hydrogen flow seems to be independent of the amount of supported cobalt. Changes in surface characteristics were analyzed using thermogravimetric analyses coupled to a mass spectrometer, X-ray photoelectron spectroscopy analyses and Raman spectroscopy. Transmission electron microscopy was used to complementary characterize the final size, dispersion and location of the so generated Co nanoparticles

  • Non Thermal Plasma Functionalized 2D Carbon–Carbon Composites as Supports for Co Nanoparticles
    Plasma Chemistry and Plasma Processing, 2014
    Co-Authors: Julien Souquet-grumey, Philippe Ayrault, Olivier Heintz, Joël Barrault, Jean-michel Tatibouët, Hervé Plaisantin, Jacques Thébault, Sabine Valange, Elodie Fourré
    Abstract:

    Novel two-dimensional Carbon–Carbon Composites made of Carbon nanofibers (CNFs) supported on a Carbon preform were functionalized by non thermal plasma treatment (room temperature, atmospheric pressure, humid air), before being used as supports for metallic cobalt nanoparticles. It was shown that the degree of functionalization of the Carbon nanofibers depends on the plasma power input, the treatment time and the CNF loading. The size of the cobalt nanoparticles generated after subsequent reduction of the Co-containing plasma treated CNF/C Composites under hydrogen flow seems to be independent of the amount of supported cobalt. Changes in surface characteristics were analyzed using thermogravimetric analyses coupled to a mass spectrometer, X-ray photoelectron spectroscopy analyses and Raman spectroscopy. Transmission electron microscopy was used to complementary characterize the final size, dispersion and location of the so generated Co nanoparticles.

Julien Souquet-grumey - One of the best experts on this subject based on the ideXlab platform.

  • Non Thermal Plasma Functionalized 2D Carbon-Carbon Composites as Supports for Co Nanoparticles
    Plasma Chemistry and Plasma Processing, 2014
    Co-Authors: Julien Souquet-grumey, Philippe Ayrault, Olivier Heintz, Joël Barrault, Jean-michel Tatibouët, Hervé Plaisantin, Jacques Thébault, Sabine Valange, Elodie Fourré
    Abstract:

    Novel two-dimensional Carbon-Carbon Composites made of Carbon nanofibers (CNFs) supported on a Carbon preform were functionalized by non thermal plasma treatment (room temperature, atmospheric pressure, humid air), before being used as supports for metallic cobalt nanoparticles. It was shown that the degree of functionalization of the Carbon nanofibers depends on the plasma power input, the treatment time and the CNF loading. The size of the cobalt nanoparticles generated after subsequent reduction of the Co-containing plasma treated CNF/C Composites under hydrogen flow seems to be independent of the amount of supported cobalt. Changes in surface characteristics were analyzed using thermogravimetric analyses coupled to a mass spectrometer, X-ray photoelectron spectroscopy analyses and Raman spectroscopy. Transmission electron microscopy was used to complementary characterize the final size, dispersion and location of the so generated Co nanoparticles

  • Non Thermal Plasma Functionalized 2D Carbon–Carbon Composites as Supports for Co Nanoparticles
    Plasma Chemistry and Plasma Processing, 2014
    Co-Authors: Julien Souquet-grumey, Philippe Ayrault, Olivier Heintz, Joël Barrault, Jean-michel Tatibouët, Hervé Plaisantin, Jacques Thébault, Sabine Valange, Elodie Fourré
    Abstract:

    Novel two-dimensional Carbon–Carbon Composites made of Carbon nanofibers (CNFs) supported on a Carbon preform were functionalized by non thermal plasma treatment (room temperature, atmospheric pressure, humid air), before being used as supports for metallic cobalt nanoparticles. It was shown that the degree of functionalization of the Carbon nanofibers depends on the plasma power input, the treatment time and the CNF loading. The size of the cobalt nanoparticles generated after subsequent reduction of the Co-containing plasma treated CNF/C Composites under hydrogen flow seems to be independent of the amount of supported cobalt. Changes in surface characteristics were analyzed using thermogravimetric analyses coupled to a mass spectrometer, X-ray photoelectron spectroscopy analyses and Raman spectroscopy. Transmission electron microscopy was used to complementary characterize the final size, dispersion and location of the so generated Co nanoparticles.

Yanhui Chu - One of the best experts on this subject based on the ideXlab platform.

  • zrb2 sic gradient oxidation protective coating for Carbon Carbon Composites
    Ceramics International, 2014
    Co-Authors: Xuanru Ren, Yanhui Chu
    Abstract:

    Abstract To improve the oxidation protective ability of Carbon/Carbon Composites, ZrB 2 –SiC gradient coating was prepared on the surface of C/C Composites by an in-situ reaction method. The ZrB 2 –SiC gradient coating consisted of an inner ZrB 2 –SiC layer and an outer ZrB 2 –SiC–Si coating. The phase composition and microstructures of the multiphase coating were characterized by XRD, EDS and SEM. Results showed that the inner coating is mainly composed of ZrB 2 and SiC, while the outer multiphase coating is composed of ZrB 2 , SiC and Si. The multilayer coating is about 200 μm in thickness, which has no penetration crack or big hole. The oxidation behavior of the coated C/C Composites at 1773 K in air was investigated. Results show that the gradient ZrB 2 –SiC oxidation protective coating could protect C/C from oxidation for 207 h with only (4.56±1.2)×10 −3  g/cm 2 weight loss, owing to the compound silicate glass layer with the existence of thermally stable phase ZrSiO 4 .