Thermal-diffusivity measurement of 3D-stitched C–SiC composites

✍ Scribed by Suresh Kumar; Anil Kumar; Anupam Shukla; G. Rohini Devi; A.K. Gupta

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 653 KB
• Volume: 29
• Category: Article
• ISSN: 0955-2219
• DOI: 10.1016/j.jeurceramsoc.2008.06.028

✦ Synopsis

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 throughthickness directions. It varies from 77 mm 2 /s at room-temperature to 14.7 mm 2 /s at 1500 • C in in-plane and 36-6.1 mm 2 /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.