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HRXRD study of the theoretical densities of novel reactive sintered boride candidate neutron shielding materials

•Novel Reactive Sintered Borides (RSBs) are candidate radiation shielding materials.•RSBs were prepared by sintering boron carbide, iron-chrome alloy and tungsten metal.•Phase abundance and theoretical density ρXRD determined by X-ray diffraction (XRD).•Sintered RSBs converged towards atomic composi...

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Published in:Nuclear materials and energy 2020-01, Vol.22, p.100732, Article 100732
Main Authors: Marshall, J.M., Walker, D., Thomas, P.A.
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description •Novel Reactive Sintered Borides (RSBs) are candidate radiation shielding materials.•RSBs were prepared by sintering boron carbide, iron-chrome alloy and tungsten metal.•Phase abundance and theoretical density ρXRD determined by X-ray diffraction (XRD).•Sintered RSBs converged towards atomic compositions W: Fe: B = 1: 1: 1.•Highest relative density (ρ/ρXRD) = 99.3% for RSB composition W: Fe: B ≈ 1: 1:1. 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 (Humphry-Baker, 2007 [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%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.
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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 (Humphry-Baker, 2007 [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%&lt;x &lt; 40 at%. Stable RSB bodies formed from sintering for compositions where B at%&gt;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. 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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 (Humphry-Baker, 2007 [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%&lt;x &lt; 40 at%. Stable RSB bodies formed from sintering for compositions where B at%&gt;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.</description><subject>Cemented carbides</subject><subject>Nuclear fusion</subject><subject>Powder metallurgy</subject><subject>Radiation shielding</subject><subject>Tungsten borides</subject><subject>XRD</subject><issn>2352-1791</issn><issn>2352-1791</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><sourceid>DOA</sourceid><recordid>eNp9UctKQzEQvYiCov0Ad_mB1iT3kRtcSX0VBKEouAt5TGrKbVKStNC_N9eKuHIxnJkznMMMp6quCZ4RTLqb9cxvYEYxHWfManpSXdC6pVPCODn9059Xk5TWGGPCaU-b-qLaPi8_lvco5Z05oGBR_oSxQoTstByQAZ9cdpDGpQ97GFAEqbPbA0rOZ4hgkArRGUBaeuOMzIA87HIMHqVPB4NxfoU2hY5ODumqOrMFYPKDl9X748Pb_Hn68vq0mN-9THWDuzy1VPWttUDBUMUVaztimaG63K462zPKFbe6ptIoyrq-b6A2LYGec97Zrrb1ZbU4-pog12Ib3UbGgwjSiW8ixJWQsfw4gKgJayRpGCZWNcAaDg1rlZaGWYv7ri1e5OilY0gpgv31I1iMCYi1KAmIMQFxTKBobo8aKE_uHUSRtAOvwbgIOpcr3D_qL-Alj6M</recordid><startdate>202001</startdate><enddate>202001</enddate><creator>Marshall, J.M.</creator><creator>Walker, D.</creator><creator>Thomas, P.A.</creator><general>Elsevier Ltd</general><general>Elsevier</general><scope>6I.</scope><scope>AAFTH</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>DOA</scope><orcidid>https://orcid.org/0000-0003-3642-8968</orcidid></search><sort><creationdate>202001</creationdate><title>HRXRD study of the theoretical densities of novel reactive sintered boride candidate neutron shielding materials</title><author>Marshall, J.M. ; Walker, D. ; Thomas, P.A.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c406t-f2b85ffe2ed2b9b7561f7d2c000b6f8729b9fc32adb276884e3d51e89996f63f3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Cemented carbides</topic><topic>Nuclear fusion</topic><topic>Powder metallurgy</topic><topic>Radiation shielding</topic><topic>Tungsten borides</topic><topic>XRD</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Marshall, J.M.</creatorcontrib><creatorcontrib>Walker, D.</creatorcontrib><creatorcontrib>Thomas, P.A.</creatorcontrib><collection>ScienceDirect Open Access Titles</collection><collection>Elsevier:ScienceDirect:Open Access</collection><collection>CrossRef</collection><collection>Directory of Open Access Journals</collection><jtitle>Nuclear materials and energy</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Marshall, J.M.</au><au>Walker, D.</au><au>Thomas, P.A.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>HRXRD study of the theoretical densities of novel reactive sintered boride candidate neutron shielding materials</atitle><jtitle>Nuclear materials and energy</jtitle><date>2020-01</date><risdate>2020</risdate><volume>22</volume><spage>100732</spage><pages>100732-</pages><artnum>100732</artnum><issn>2352-1791</issn><eissn>2352-1791</eissn><abstract>•Novel Reactive Sintered Borides (RSBs) are candidate radiation shielding materials.•RSBs were prepared by sintering boron carbide, iron-chrome alloy and tungsten metal.•Phase abundance and theoretical density ρXRD determined by X-ray diffraction (XRD).•Sintered RSBs converged towards atomic compositions W: Fe: B = 1: 1: 1.•Highest relative density (ρ/ρXRD) = 99.3% for RSB composition W: Fe: B ≈ 1: 1:1. 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 (Humphry-Baker, 2007 [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%&lt;x &lt; 40 at%. Stable RSB bodies formed from sintering for compositions where B at%&gt;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.</abstract><pub>Elsevier Ltd</pub><doi>10.1016/j.nme.2020.100732</doi><orcidid>https://orcid.org/0000-0003-3642-8968</orcidid><oa>free_for_read</oa></addata></record>
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subjects Cemented carbides
Nuclear fusion
Powder metallurgy
Radiation shielding
Tungsten borides
XRD
title HRXRD study of the theoretical densities of novel reactive sintered boride candidate neutron shielding materials
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