Studies on Fibre Orientation of Carbon Fibre Preforms for Fabrication of C/SiC Fasteners
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ORIGINAL ARTICLE
Studies on Fibre Orientation of Carbon Fibre Preforms for Fabrication of C/SiC Fasteners Shobhit Kumar1 · Anil Painuly1 · Anurag Kamal1 · Neeraj Naithani2 · Sandeep Kumar Kizhakke Purayil1 · Shyin Palani Prabhakaran1 · Renjith Devasia1 Received: 22 May 2020 / Accepted: 4 September 2020 © Indian National Academy of Engineering 2020
Abstract Continuous carbon fibre-reinforced silicon carbide (C/SiC) ceramic matrix composites (CMCs) are one of the most promising candidate materials for many high-temperature applications, particularly as thermo-structural hardware for aerospace and aircraft applications. However, the major challenge lies in joining these composites to the airframe for their application as re-usable thermal protection systems for re-entry vehicles. This necessitates development of suitable fastening mechanisms which can withstand the aero-thermal loads of structures during re-entry conditions. Conventionally used high-temperature fasteners are molybdenum based and they suffer from problems related to oxidation at temperatures above 800 °C in air. Thus for such applications, C/SiC fasteners are considered more reliable due to the oxidation resistance offered up to 1650 °C. This study highlights the importance of fibre orientation in continuous C/SiC composite used for fabricating C/SiC fasteners for futuristic re-entry launch vehicles. The study describes fabrication of four different types of continuous fibre-oriented C/SiC composites viz., 2D stitched, 3D woven, 4D NOOBED and 5D NOOBED configurations via chemical vapour infiltration (CVI) route, and compares their tensile property at room temperature so as to find out a suitable preform for fabrication of C/ SiC fasteners. It was found that 2D stitched preform-based C/SiC specimen gave the highest tensile strength (157 ± 14 MPa), followed by 3D woven preform-based specimen (130 ± 25 MPa), while the tensile strength of 4D- and 5D-based specimens was very low. Through this study, two carbon fibre preforms viz., 2D stitched and 3D woven are selected for realizing C/ SiC fasteners. The role of pyrocarbon interphase coating on carbon fibres, in obtaining high mechanical properties is also understood. Keywords C/SiC fasteners · Fibre orientation · Carbon fibre preforms · CVI · Ceramic matrix composites
Introduction Continuous carbon fibre-reinforced silicon carbide (C/SiC) ceramic matrix composites (CMCs) are one of the most promising candidate materials for many high-temperature applications, particularly as thermo-structural hardware for
* Shobhit Kumar [email protected]; [email protected] 1
Ceramic Matrix Products Division, Analytical, Spectroscopy & Ceramics Group, PCM Entity, Vikram Sarabhai Space Centre, Indian Space Research Organisation, Thiruvananthapuram, Kerala, India
Analytical and Spectroscopy Division, Analytical, Spectroscopy & Ceramics Group, PCM Entity, Vikram Sarabhai Space Centre, Indian Space Research Organisation, Thiruvananthapuram, Kerala, India
2
aerospace and aircraft applications (Krenk
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