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HRXRD study of the theoretical densities of novel Reactive Sintered Boride candidate neutron shielding materials

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Marshall, Jessica M., Walker, David and Thomas, Pam A. (2020) HRXRD study of the theoretical densities of novel Reactive Sintered Boride candidate neutron shielding materials. Journal of Nuclear Materials and Energy, 22 . 100732. doi:10.1016/j.nme.2020.100732

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Official URL: https://doi.org/10.1016/j.nme.2020.100732

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Abstract

Reactive Sintered Borides (RSBs) are novel borocarbide materials derived from FeCr-based cemented tungsten (FeCr-cWCs) show considerable promise as compact radiation armour for proposed spherical tokamak,[1],[2],[3],[4],[5]. Six candidate compositions (four RSBs, two cWCs) were evaluated by high-resolution X-ray diffraction (XRD), inductively coupled plasma (ICP), energy dispersive X-ray analysis (EDX) and scanning electron microscopy (SEM) to determine the atomic composition, phase presence, and theoretical density.
RSB compositions were evaluated with initial boron contents equivalent to 25 at% < x < 40 at%. Stable RSB bodies formed from sintering for compositions where B at% > 30 at%. All RSB compositions showed delamination and carbon enrichment in the bulk relative to the surface, consistent with non-optimal binder removal and insufficient sintering time. Phase abundance within RSBs derived from powder XRD was dominated by iron tungsten borides (FeWB/FeW2B2), tungsten borides (W2B5/WB) and iron borides. The most optimal RSB composition (B5T522W) with respect to physical properties and highest ρ/ρtheo had ρtheo = 12.59 ± 0.01 g cm-3 for ρ/ρtheo = 99.3% and had the weigh-in and post-sintered W : B : Fe abundance closest to 1 : 1 : 1. This work indicates that despite their novelty, RSB materials can be optimized and in principle be processed using existing cWC processing routes.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Physics
Journal or Publication Title: Journal of Nuclear Materials and Energy
Publisher: Elsevier BV
ISSN: 2352-1791
Official Date: 4 February 2020
Dates:
DateEvent
4 February 2020Available
28 January 2020Accepted
Date of first compliant deposit: 31 January 2020
Volume: 22
Article Number: 100732
DOI: 10.1016/j.nme.2020.100732
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access
Funder: University of Warwick Research Development Fund
Grant number: RD18033
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