Article

Fabrication in-situ SiC nanowires/SiC matrix composite by chemical vapour infiltration process

Micro-nano Components Materials Group, Materials Engineering Laboratory, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan; Institute of Advanced Energy, Kyoto University, Uji, Kyoto 611-0011, Japan
Materials Letters 01/2004; DOI: 10.1016/j.matlet.2004.05.059

ABSTRACT A SiC nanowires-reinforced SiC matrix composite was fabricated using chemical vapour infiltration (CVI) process. SiC nanowires with thin carbon coating were grown directly in a fibrous preform prior to the CVI matrix densification. The nanowires consist of single crystal β phase SiC and uniform carbon shell coating of ∼5 nm, with diameters of several tens to 100 nm. The volume fraction of the nanowires in the fabricated composite is ∼5%. Contributions of the nanowires to the mechanical properties of the composite are expected.

1 Bookmark
 · 
250 Views
  • Journal of The Ceramic Society of Japan - J CERAMIC SOC JPN. 01/2009; 117(1362):194-197.
  • [Show abstract] [Hide abstract]
    ABSTRACT: In this paper, fiber-like and dispersible tobermorite (Ca(5)(Si(6)O(16))(OH)(2).4H(2)O), 80-120 nm in diameter and up to tens of micrometers in length was prepared by a hydrothermal microemulsion method. In vitro bioactivity of the nanofibers were evaluated by examing the hydroxyapatite (HAp) forming ability on the surface after soaking in simulated body fluid (SBF) for various periods. After soaking in SBF, the nanofibers were completely covered by bonelike hydroxycarbonate apatite (HCA) layers, and the nanofibers after soaking still kept stability in fibrous morphology. The dissolution of the nanofibers reached about 24.5% after soaking in SBF for 14 days. The results suggested that the tobermorite nanofibers exhibited certain desirable characteristics, including bioactivity, degradability and stability in morphology, and are a potential candidate for a reinforcement material in the development of novel bioactive and degradable composites for biomedical applications.
    Acta Biomaterialia 04/2007; 3(2):271-6. · 5.09 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: A novel and simple sol–gel route has been used for the fabrication of composite structure composed of carbon fibers and silicon carbide nanowires embedded in dense silicon carbide matrix. The carbonaceous silica sol was impregnated in the carbon fiber preform at atmospheric pressure. The sol impregnated carbon preform was cured and heat treated to convert into silicon carbide. The analysis by X-ray diffraction, scanning electron microscopy, X-ray tomography, and transmission electron microscopy indicates that the impregnated carbonaceous silica gel converts to β-silicon carbide with dense and wire morphology. Different morphological silicon carbide was uniformly distributed inside carbon fiber preform and there was no degradation in thermophysical properties of carbon composite during processing. These results reveal high efficient reinforcement of different morphological silicon carbide in carbon composite, demonstrate a new mechanism of carbon composite reinforcement and suggest a new direction to carbon composite reinforcement. Graphical Abstract
    Journal of Materials Science 10/2014; 49(19). · 2.31 Impact Factor