Vapour phase synthesis and characterisation of Cf/SiC composites with self-healing Si-B-C monolayer coating

RizvanBasha, M and UdayaKumar, A and Stalin, M and Singh, S and Bhanu Prasad, VV and Sankaranarayanan, SR (2020) Vapour phase synthesis and characterisation of Cf/SiC composites with self-healing Si-B-C monolayer coating. Ceramics International, 46 (15). pp. 23785-23796. ISSN 02728842

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Abstract

Carbon fibre reinforced CVI-SiC matrix (Cf/SiC) composite is well known for its superior properties such as low density, high specific modulus, high fracture toughness, and high temperature mechanical properties. In the present work, 2.5-Directional Cf/SiC composites with (PyC/SiC) n=4 multilayer interface having two different thicknesses with a density of ~2.1 g cm-3 are prepared through isobaric isothermal chemical vapour infiltration technique. High temperature tensile properties of the prepared composites with and without Si-B-C seal coating are studied and the results are presented. Samples prepared without seal coat exhibited a KICof ~ 30 MPa m1/2, and tensile strength of ≥200 MPa at room temperature. Si-B-C seal coated Cf/SiC composites has shown significant increase (28%) in high temperature tensile strength at 1200 °C and 1500 °C respectively compared to uncoated composites. Microstructural observations, XRD, and XPS studies support the observed thermomechanical behaviour of these composites at 1200 °C and 1500 °C.

Item Type: Article
Subjects: CHEMISTRY AND MATERIALS > Composite Materials
Depositing User: Smt Bhagya Rekha KA
Date Deposited: 25 Jun 2021 15:11
Last Modified: 25 Jun 2021 15:11
URI: http://nal-ir.nal.res.in/id/eprint/13396

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