Experimental approach to probe into mechanisms of high-temperature erosion of NbB2-ZrO2

Maity, T and Gopinath, NK and Biswas, K and Basu, B (2021) Experimental approach to probe into mechanisms of high-temperature erosion of NbB2-ZrO2. In: Journal of the American Ceramic Society .

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Abstract

In the backdrop of potential applications of boride-based materials in high-speed supersonic aircrafts, the present investigation probes in comprehending the mechanisms of high-temperature erosive wear of spark plasma sintered NbB2-ZrO2 composite. The solid particle erosion experiments were performed at different temperatures starting from room temperature (25°C) to 800°C using Al2O3 particles (50 μm). The air-erodent particle mixture was impinged toward the target surface at normal impact with a velocity of 50 m/s. The detailed microstructural analysis using HRTEM reveals the generation and accumulation of a large number of dislocations within NbB2 and ZrO2 grains of the eroded surfaces. Such observations indicate the activation of dislocation plasticity during erosion at 800°C. XRD-based analyses provided residual stress-based interpretation for the enhancement of erosion resistance at high temperatures. In contrast, substantial material loss via brittle failure, involving the generation and intersection of the lateral/radial cracks, was recorded after room temperature erosion. In case of erosion at 400°C and 800°C, the residual stress relaxes as a consequence of high-temperature exposure prior to erosion. The accumulation of dislocations near the crater region and shot peening phenomena play a dominant role in decreasing erosion rate with increasing erosion test temperature. © 2021 The American Ceramic Society

Item Type:	Journal Article
Publication:	Journal of the American Ceramic Society
Publisher:	Blackwell Publishing Inc.
Additional Information:	The copyright for this article belongs to Blackwell Publishing Inc.
Keywords:	Air; Alumina; Aluminum oxide; High temperature applications; Niobium compounds; Residual stresses; Shot peening; Zirconia, Dislocation plasticity; Erodent particles; Erosion resistance; Experimental approaches; High temperature erosion; High-temperature exposure; Microstructural analysis; Solid particle erosion, Erosion
Department/Centre:	Division of Chemical Sciences > Materials Research Centre Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited:	24 Mar 2021 09:00
Last Modified:	24 Mar 2021 09:00
URI:	http://eprints.iisc.ac.in/id/eprint/68529

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