Zirconium carbide oxidation: Maltese Cross formation and interface characterization

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Title: Zirconium carbide oxidation: Maltese Cross formation and interface characterization
Author(s): Gasparrini, C
Podor, R
Horlait, D
Chater, R
Lee, W
Item Type: Journal Article
Abstract: Oxidation of dense hot pressed ZrC specimens from 10 73 – 1473 K was investigated using an in - situ technique: HT - ESEM. Cuboid specimens were monitored on the surface and on edges and corners durin g oxidation in order to understand the influence of crack formation and propagation on the Maltese c ross shape development of the oxide . The oxidation mechanism comprised three steps: (1) delamination of sample edges , (2) crack formation at corners and (3) crack propagation towards the inner core and formation of microcracks parallel to the interface that increase the accessible surface area followed by a drastic volume expansion . The m icrocrack pattern is found to be repetitive as if a cyclic deb on ding of the interface occurred . Characterization of the interface by TEM and HRTEM revealed the interface between ZrC and ZrO 2 to comprise a 2 μm thick amorphous carbon matrix with ZrO 2 nanocrystals embedded in it.
Publication Date: 2-Dec-2016
Date of Acceptance: 21-Jul-2016
URI: http://hdl.handle.net/10044/1/42629
DOI: 10.1007/s11085-016-9672-6
ISSN: 1573-4889
Publisher: Springer Verlag (Germany)
Journal / Book Title: Oxidation of Metals
Copyright Statement: © 2016 Springer Verlag.
Sponsor/Funder: Engineering & Physical Science Research Council (E
Funder's Grant Number: EP/L014041/1
Keywords: Materials
0914 Resources Engineering And Extractive Metallurgy
Publication Status: Accepted
Appears in Collections:Faculty of Engineering
Materials



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