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Fabrication of protective tantalum carbide coatings on carbon fibers using a molten salt method |
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| Authors: | ZJ Dong GM Yuan N Li ZY Jiang |
| Institution: | a The Hubei Province Key Laboratory of Ceramics & Refractories, The Hubei Province Key Laboratory of Coal Conversion & New Carbon Materials, Wuhan University of Science & Technology, Wuhan, Hubei 430081, China b National Key Defense Laboratory of Advanced Functional Composite Materials Technology, Aerospace Research Institute of Materials and Processing Technology, Beijing 100076, China c Institute for Materials Research, The University of Leeds, Leeds LS2 9JT, United Kingdom |
| Abstract: | Protective tantalum carbide (TaC) coatings were fabricated successfully on carbon fibers in the temperature range of 950-1100 °C using a molten salt method. A salt mixture composed of LiCl-KCl-KF was used as a reaction medium in which the tantalum and the carbon fiber substrates reacted to form the TaC coatings. The structure and morphology of the TaC coatings were characterized by XRD, SEM and EDX analyses. The results show that the reaction temperature and time have significant influence on the thickness, integrity and surface morphology of the TaC coatings. A uniform, adherent and crack-free TaC coating can be obtained by controlling the reaction temperature and time. Thermo-gravimetric analysis indicated that the oxidation resistance of the carbon fibers was improved remarkably by coating them with a high-quality TaC layer. |
| Keywords: | TaC Coating Carbon fiber Molten salt method |
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