Influence of Oxidation on Fracture Toughness of Carbon-Carbon Composites for High-Temperature Applications
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https://orcid.org/0000-0002-3115-2141
Neelakantha V. Londe
Department of Mechanical Engineering, Mangalore Institute of Technology and Engineering, Moodabidri, VTU, Karnataka, 574225, India.
M. Lokesha
Department of Mechanical Engineering, Mangalore Institute of Technology and Engineering, Moodabidri, VTU, Karnataka, 574225, India.
S.N. Vasantha Kumar
Department of Mechanical Engineering, Canara Engineering College, Mangalore, VTU, Karnataka, 574219, India.
A.O. Surendranathan
Department. of Metallurgical and Materials Engineering, NITK, Surathkal, Karnataka, 575025, India.
Abstract
Carbon-Carbon Composites (C-CC), used as composites for their remarkable qualities in the space industry as well as in many other industry sectors. C-CC has proven to be the most efficient material in extreme temperature situations. One of the best high-temperature materials with good thermal quality, such as high-temperature stability, outstanding thermal conductivity and low-temperature expansion coefficients. In aircraft, railways, trucks and even race vehicles, C-CC brake disks are in high demand. In comparison to the favorable thermal and mechanical qualities of C-CC, their great sensitivity to oxidation in an oxidizing environment at temperatures even around 400°C is a major restriction with these composites. In particular, a study of the C-CC oxidation mechanism helps to create protective measures for these composites. The present experimental study explores the influence of oxidation in static air on the fracture toughness of C-CC. At a temperature of around 400°C to 700°C in an increase of 100°C, an oxidation evaluation of the material was carried out in static air. Results show a decrease in fracture toughness to increase in the temperature. We can observe that C-CC fracture toughness is severely affected by oxidation. The variation began at 400°C from 6% and was anticipated at 700°C up to 45%.
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