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Microstructure dependent ablation behaviour of precursor derived SiOC ceramic foam for high temperature applications
Affiliation:1. Department of Mechanical Engineering, College of Engineering Guindy Campus, Anna University, Chennai 600025, India;2. Laboratory for High Performance Ceramics, Department of Metallurgical and Materials Engineering & Ceramic Technologies Group-Centre of Excellence in Materials & Manufacturing for Futuristic Mobility, Indian Institute of Technology-Madras (IIT Madras), Chennai 600036, India;3. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai 600036, India;1. Laboratory for High Performance Ceramics, Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras (IIT Madras), Chennai 600036, India;2. CALPHAD Lab, Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras (IIT Madras), Chennai 600036, India;3. Ceramic Technologies Group – Centre of Excellence in Materials and Manufacturing for Futuristic Mobility, Indian Institute of Technology Madras (IIT Madras), Chennai 600036, India;4. Institute for Materials Sciences, Technical University of Darmstadt, Darmstadt 64287, Germany;5. Fraunhofer Institution for Materials Recycling and Resource Strategies (Fraunhofer IWKS), Brentano str. 2a, D-63755 Alzenau, Germany;6. Institute of Applied Geosciences, Technical University of Darmstadt, Darmstadt 64287, Germany
Abstract:Ablation behaviour of poly(hydridomethylsiloxane) derived open and closed porous structured SiOC ceramic foams was evaluated using oxy-acetylene flame at 1500 °C for various time durations. X-ray diffraction and scanning electron microscopy analyses of ablated SiOC ceramic foams revealed the formation of a thin protective SiO2 layer inhibiting further oxidation. The closed porous structured SiOC ceramic foams exhibited very low mass ablation rate in contrast to open porous structured SiOC ceramic foams owing to the differences in thermal energy dissipation mechanism. The feasibility of the plausible foam reduction reactions pertaining to the ablation mechanism was further investigated by computing the Gibbs energy and HR-TEM analysis. The study corroborated the significance of tailoring the microporous structured SiOC ceramic foams as potential thermal protection material for high temperature applications.
Keywords:Ablation resistance  Thermal protection system  Ceramic foams  Precursor derived ceramics  High temperature ceramics
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