Characterization of the oxidation of C/C/SiC composites by Xray micro-tomography |
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| Affiliation: | 1. Fraunhofer ISC, Center for High Temperature Materials and Design HTL, Gottlieb-Keim-Str. 62, 95448, Bayreuth, Germany;2. University of Applied Sciences Hof, Alfons-Goppel-Platz 1, 95028, Hof, Germany;1. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, Kharagpur 721302, West Bengal, India;2. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, Uttarakhand, India;1. Laboratory of Science and Technology on UAV, Northwestern Polytechnical University, Xi’an, 710065, China;2. Xi''an Institute of Space Radio Technology, Xi’an, 710100, China;3. School of Aeronautics, Northwestern Polytechnical University, Xi’an 710072, China;4. Faculty of Science, Engineering and Computing, Kingston University London, SW15 3DW, UK;1. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi''an, Shaanxi 710072, PR China;2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi''an, Shaanxi 710072, PR China;3. School of Materials Science and Engineering, Chang''an University, Xi''an, 710064, Shaanxi, PR China |
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| Abstract: | The objective of this paper is to determine the influence of the nature of the C/C/SiC composite on the oxidation rate of fibers and the interphase and the development of oxidation pathways using characterization techniques such as Xray micro-tomography (μCT), scanning electron microscope (SEM) and optical microscopy (OM). The microstructure of two C/C/SiC composites (named 2D-RMI and 2D-CVI) was characterized before and after ageing tests performed by Thermogravimetric Analysis (TGA) under dry air at 1000 °C and 1300 °C. The three techniques are complementary and tomography appears to be a promising means for monitoring the oxidation of parts in service. Moreover, the oxidation of a fiber does not develop in a parallel plan to the section but as conical shape. To calculate the oxidation kinetics related to the surface, it is therefore necessary to take into account the geometry of the fibers that offers a much more important reactive surface. |
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| Keywords: | CMC C/C/SiC Tomography TGA Oxidation |
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