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    Volume 10, Issue 2 (June 2021)

    Special Issue Paper

    Development of C/SiC Fasteners for High-Temperature Applications

    (Received 25 October 2020; accepted 2 March 2021)

    Published Online: 29 April 2021

    CODEN: MPCACD

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    Abstract

    Continuous carbon fiber reinforced silicon carbide (C/SiC) ceramic matrix composites are the candidate materials for high-temperature structural applications owing to their high specific strength, low coefficient of thermal expansion, and moderate thermal conductivity. C/SiC based fasteners provide reliability with oxidation resistance up to 1,650°C for joining such C/SiC structural components used in reusable launch vehicles for space applications. The present study describes the methodology to realize C/SiC based M8 fasteners by isothermal-isobaric chemical vapor infiltration process using 2D-stitched carbon fabric preforms. The realized fasteners exhibited a density of 2.10 g/cm3, a tensile strength of 191 ± 3 MPa, a shear strength of 230 ± 69 MPa in non-threaded and 150 ± 86 MPa in threaded regions of shank at room temperature, a high-temperature tensile strength of 170 ± 12 MPa, and a tensile modulus of 70 ± 8 GPa at 1,100°C in the atmospheric conditions. The tensile failure of the C/SiC bolts was observed to depend upon the relative dimensions of fillet radius and thread root radius, wherein a small fillet radius was observed to be detrimental, as it resulted in failure at the head-shank interface of the bolts. The scanning electron microscope images of tensile tested C/SiC bolts indicate extensive fiber pullout, characteristic of quasi-ductile failure of bolts. It is clearly evident from the studies that the C/SiC fasteners are a promising alternative over the currently used molybdenum alloy fasteners.

    Author Information:

    Kumar, Shobhit
    Ceramic Matrix Products Division, Vikram Sarabhai Space Centre, Indian Space Research Organisation, Thiruvananthapuram,

    Painuly, Anil
    Ceramic Matrix Products Division, Vikram Sarabhai Space Centre, Indian Space Research Organisation, Thiruvananthapuram,

    Kamal, Anurag
    Ceramic Matrix Products Division, Vikram Sarabhai Space Centre, Indian Space Research Organisation, Thiruvananthapuram,

    Kuttappan, Sajimon
    Quality Control Materials, Vikram Sarabhai Space Centre, Indian Space Research Organisation, Thiruvananthapuram,

    Kumar, Ravi Ranjan
    Aerospace Materials Lab, Liquid Propulsion Systems Centre, Indian Space Research Organisation, Thiruvananthapuram,

    Prabhakaran, Shyin Palani
    Ceramic Matrix Products Division, Vikram Sarabhai Space Centre, Indian Space Research Organisation, Thiruvananthapuram,

    Devasia, Renjith
    Ceramic Matrix Products Division, Vikram Sarabhai Space Centre, Indian Space Research Organisation, Thiruvananthapuram,


    Stock #: MPC20200161

    ISSN:2379-1365

    DOI: 10.1520/MPC20200161

    Author
    Title Development of C/SiC Fasteners for High-Temperature Applications
    Symposium ,
    Committee C28