Development and Evaluation of Carbon-Carbon Threaded Fasteners for High Temperature Applications

Juhi Kushwaha; V. Pawan Kumar; K.H. Sinnur

doi:10.14429/dsj.62.2395

Juhi Kushwaha Advanced Systems Laboratory, Hyderabad
V. Pawan Kumar Advanced Systems Laboratory, Hyderabad
K.H. Sinnur Advanced Systems Laboratory, Hyderabad

DOI: https://doi.org/10.14429/dsj.62.2395

Keywords: Carbon-carbon components, carbon-carbon fasteners, material evaluation, microstructure

Abstract

Carbon-Carbon (C-C) threaded fasteners have been developed for joining C-C composites experiencing temperature above 1500 ˚C. The fasteners were fabricated from spun yarn graphitized carbon fabric through resin route and from needle punched carbon felt through pitch route techniques. The preforms were processed with multiple cycles of impregnation, carbonisation, and graphitisation up to densities of 1.78 gcm-3 and 1.90 gcm-3. Densification process cycles were repeated to obtain composites with reduced porosity and improved thermo-mechanical properties. Material evaluation of C-C fasteners is discussed and compared with existing graphite fasteners used in industrial and aerospace sectors. Scanning electron microscopy was also carried out to study microstructure of fractured specimens.

Defence Science Journal, 2012, 62(5), pp.348-355, DOI:http://dx.doi.org/10.14429/dsj.62.2395

Author Biographies

Juhi Kushwaha, Advanced Systems Laboratory, Hyderabad

Ms Juhi Kushwaha, obtained her BE (Polymer Sci. Chemical Technol.) from Delhi College of Engineering, Delhi, in 2003. Presently, she is working as Scientist ‘C’ in the Directorate of High Temperature Composite Center (DOHTCC) of Advanced Systems Laboratory (ASL), Hyderabad. She has been working in development, characterisation and evaluation of Carbon- Carbon (C-C) composite products for high temperature applications in defence, development of special fiber architecture preforming like 3D integrally woven fabric and needle punched felt for aerospace applications, and C-C brake discs for LCA.

V. Pawan Kumar, Advanced Systems Laboratory, Hyderabad

Mr V. Pawan Kumar did his BTech (Textile Technology) in 2009 from Osmania University, Hyderabad. He is working as Senior Research Fellow in DOHTCC of ASL, Hyderabad. He has gained experience in technical textile preforming and development of multidirectionally reinforced carboncarbon composites, and high temperature composites for aerospace applications.

K.H. Sinnur, Advanced Systems Laboratory, Hyderabad

Mr K.H. Sinnur obtained his BTech (Textile Technology) from Govt. SK SJ Technological Institute Bangalore, Bengaluru in 1984 and MBA (Operations Management) from IGNOU , New Delhi, in 2010. He is presently working as Scientist ‘F’ in DOHTCC of ASL. He has been working on the fiber architecture and carbon-carbon (C-C) technology. His major contributions include Developments of glass/Kevlar fiber contour woven socks for aircraft/missile radomes, C-C brake disc for LCA, different forms of carbon fiber reinforcements like 3-D fabrics, chopped strand mats, needle punched performs, and C-C products for aerospace applications.

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