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Thermal-diffusivity measurement of 3D-stitched C–SiC composites
Authors:Suresh Kumar  Anil Kumar  Anupam Shukla  G Rohini Devi  AK Gupta
Affiliation:1. Advanced Systems Laboratory, DRDO, Hyderabad 500058, India;2. Department of Chemical Engineering, IIT Delhi, New Delhi 110016, India;1. Department of Physics, Anil Neerukonda Institute of Technology and Sciences(Autonomous), Visakhapatnam, 531 162, A.P, India;2. Department of Physics, GITAM Institute of Technology, GITAM University, Visakhapatnam, 530 045, A.P, India;3. Department of Physics, Sri Krishnadevaraya University, Anantapur, 515003, A.P, India;1. Department of Surgery, Karadeniz Technical University, School of Medicine, Trabzon, Turkey;2. Department of Pathology, Hacettepe University, School of Medicine, Ankara, Turkey;3. Department of Biostatistics, Hacettepe University, School of Medicine, Ankara, Turkey;1. College of Automobile and Mechanical Engineering, Changsha University of Science and Technology, Changsha, China;2. College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, China;3. National Engineering Research Center for Mechanical Product Remanufacturing, Academy of Armored Forces Engineering, Beijing, China;4. Research School of Engineering, College of Engineering and Computer Science, Australian National University, ACT, Australia;1. State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China;2. School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China;3. Royal School of Mines, Imperial College London, South Kensington Campus, London SW7 2AZ, UK
Abstract:Effect of siliconization conditions on thermal diffusivity of 3D-stitched fiber architecture-based C–SiC composites was investigated to select desired conditions. Several 3D-stitched C–SiC composite blocks were prepared using coal–tar pitch as a carbon precursor and siliconization was carried out at 1450 and 1650 °C for 10 and 120 min. Thermal diffusivity of blocks was investigated using laser-flash equipment in in-plane and through-thickness directions. It varies from 77 mm2/s at room-temperature to 14.7 mm2/s at 1500 °C in in-plane and 36–6.1 mm2/s in through-thickness direction. A model was developed to estimate thermal diffusivity in in-plane and through-thickness directions based on the volume fraction of the constituents and porosity of the composite blocks. The estimated thermal-diffusivity values were compared with the measured values. The values were found to be close to the experimental values in entire testing temperature range at all the siliconization conditions.
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