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Role of Interfaces in Damage Initiation and Tolerance of Carbon Nanotube-Reinforced HfB2-ZrB2 Ceramics

Dubey, S and Awasthi, S and Nisar, A and Balani, K (2020) Role of Interfaces in Damage Initiation and Tolerance of Carbon Nanotube-Reinforced HfB2-ZrB2 Ceramics. In: JOM, 72 (6). pp. 2207-2218.

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Official URL: https://dx.doi.org/10.1007/s11837-020-04164-x


HfB2-ZrB2 based ultra-high temperature ceramics (UHTCs) are used as protective tiles for leading edges and nose cones of the hypersonic vehicles that face harsh re-entry conditions. In the present work, the effect of SiC (20 vol.) and carbon nanotube (CNT, 6 vol.) incorporation on the room temperature damage initiation and wear damage tolerance of HfB2-ZrB2-based ceramics, consolidated via spark plasma sintering (SPS), is assessed. The wear rate decreased by almost > 90 in CNT-reinforced HfB2-ZrB2�SiC composites (for both scratch and fretting tests), and a significant increase in the Hertzian contact pressure (from ~ 15 GPa, in case of fretting to ~ 21 GPa, in case of scratch wear) and scratch hardness (from ~ 27 GPa to ~ 46 GPa, respectively) was observed with synergistic reinforcements of SiC and CNT. The study examines synergistic interfacial strengthening by SiC and CNT reinforcement in HfB2-ZrB2 ceramic composites as potential materials for aerospace applications where damage initiation and tolerance are issues.

Item Type: Journal Article
Publication: JOM
Publisher: Springer
Additional Information: The copyright of this article belongs to Springer
Keywords: Aerospace applications; Damage detection; Damage tolerance; Hafnium compounds; Hypersonic vehicles; Nose cones; Reinforcement; Silicon; Silicon carbide; Silicon compounds; Spark plasma sintering; Wear of materials; Zirconium compounds, Ceramic composites; Damage initiation; Fretting tests; Hertzian contact pressures; Interfacial strengthening; Potential materials; Scratch hardness; Ultra-high-temperature ceramics, Carbon nanotubes
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Date Deposited: 12 Aug 2020 06:19
Last Modified: 12 Aug 2020 06:19
URI: http://eprints.iisc.ac.in/id/eprint/65449

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