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[{"key": "dc.contributor.advisor", "value": "Laitinen, Mikko", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.advisor", "value": "Karhumaa, Teemu", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Rantanen, Tuure", "language": "", "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2022-06-23T05:09:08Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2022-06-23T05:09:08Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2022", "language": "", "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/81997", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Volframikarbidikoboltit (WC-Co) ovat t\u00e4rkeit\u00e4 kovametalleja poranterien ja jyrsinten terien raaka-aineena. WC-Co:sta valmistettujen osien kysynn\u00e4n kasvaessa on sek\u00e4 ekologisesti ett\u00e4 taloudellisesti j\u00e4rkev\u00e4\u00e4 kierr\u00e4tt\u00e4\u00e4 k\u00e4ytetyt WC-Co-palat. Kierr\u00e4tyksest\u00e4 saatavan raaka-aineen laatua voidaan parantaa erottelemalla kierr\u00e4tykseen saapuvat WC-Co-palat niiden sis\u00e4lt\u00e4mien ep\u00e4puhtauksien perusteella.\n\nT\u00e4ss\u00e4 tutkielmassa testasin ja vertailin r\u00f6ntgenfluoresenssispektroskopiaa (XRF) ja laser-indusoitua plasmaspektroskopiaa (LIBS) WC-Co-palojen alkuaineanalyysiss\u00e4. Analysoin tekniikoiden sopivuutta kromin havaitsemiseen n\u00e4ist\u00e4 WC-Co-n\u00e4ytepaloista. Analyysin keski\u00f6ss\u00e4 olivat kromin karakteristiset energiat XRF:ss\u00e4 sek\u00e4 emissioviivat LIBS:ss\u00e4.\n\nK\u00e4ytin XRF-mittauksissa kolmea eri mittausasetelmaa ja LIBS-mittauksissa kahta, jotta sain selville niiden vaikutukset mittauksiin. Molemmat tekniikat osoittautuivat luotettaviksi 0,00 ja 0,45 % kromia sis\u00e4lt\u00e4vien n\u00e4ytteiden erottamiseen toisistaan. Tekniikoista vain XRF pystyi luotettavasti erottamaan 0,00 ja 0,19 % kromia sis\u00e4lt\u00e4v\u00e4t n\u00e4ytteet toisistaan. XRF-spektreiss\u00e4 lupaavin alue kromin tunnistamiseen oli Cr Ka (n. 5,4 keV) energian kohdalla, kun taas LIBS-spektreiss\u00e4 lupaavin alue oli 425,44 nm kohdalla. N\u00e4ill\u00e4 kohdin esiintyi v\u00e4hiten muiden aineiden aiheuttamaa h\u00e4iri\u00f6t\u00e4 ja piikit erottuivat selke\u00e4sti muusta spektrist\u00e4, joten ne vaikuttavat hyvilt\u00e4 kohdilta kromin havaitsemiseen.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Tungsten carbide cobalts (WC-Co) are essential hardmetals which are used as raw material in the manufacturing of drill bits and mill grinders. As the demand for WC-Co parts grows it is of paramount importance to recycle used WC-Co pieces, both from an economical and an environmental point of view. By separating WC-Co scrap based on the amount of unwanted impurities in them, the quality of the end product increases.\n\nIn this work I tested and compared X-ray fluorescence spectroscopy (XRF) and laser-induced breakdown spectroscopy (LIBS) techniques in the elemental analysis of WC-Co scrap. The impurity element of interest was chromium and the two techniques were compared for their suitability in the detection of chromium from WC-Co scrap pieces. The analysis of the measured XRF and LIBS spectra focused on the characteristic X-ray energies and the atomic emission of lines of chromium, respectively.\n\nI used three different setups for XRF and two for LIBS to identify how they affect the results of the measurements. Both techniques turned out to be reliable in telling the difference between samples that contained 0.00 and 0.45 % Cr. However, only XRF was able to differentiate reliably between 0.00 and 0.19 % Cr samples. The most promising positions at the spectra for the detection of chromium were the presence or absence of a peak at Cr Ka (about 5.4 keV) in XRF spectra and at 425.44 nm in LIBS spectra. These positions had the least interference in and around them, and so they can be good indicators for chromium in a sample.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by Miia Hakanen (mihakane@jyu.fi) on 2022-06-23T05:09:08Z\nNo. of bitstreams: 0", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2022-06-23T05:09:08Z (GMT). No. of bitstreams: 0\n Previous issue date: 2022", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "76", "language": "", "element": "format", "qualifier": "extent", "schema": "dc"}, {"key": "dc.format.mimetype", "value": "application/pdf", "language": null, "element": "format", "qualifier": "mimetype", "schema": "dc"}, {"key": "dc.language.iso", "value": "eng", "language": null, "element": "language", "qualifier": "iso", "schema": "dc"}, {"key": "dc.rights", "value": "In Copyright", "language": "en", "element": "rights", "qualifier": null, "schema": "dc"}, {"key": "dc.subject.other", "value": "X-ray fluorescence", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "laser-induced breakdown spectroscopy", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "hardmetal", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "tungsten carbide cobalt", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "X-ray fluorescence and laser-induced breakdown spectroscopy for the sorting of WC-Co hardmetal scrap based on their chromium content", "language": "", "element": "title", "qualifier": null, "schema": "dc"}, {"key": "dc.type", "value": "master thesis", "language": null, "element": "type", "qualifier": null, "schema": "dc"}, {"key": "dc.identifier.urn", "value": "URN:NBN:fi:jyu-202206233601", "language": "", "element": "identifier", "qualifier": "urn", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Pro gradu -tutkielma", "language": "fi", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Master\u2019s thesis", "language": "en", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Matemaattis-luonnontieteellinen tiedekunta", "language": "fi", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Faculty of Sciences", "language": "en", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Fysiikan laitos", "language": "fi", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Department of Physics", "language": "en", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "Jyv\u00e4skyl\u00e4n yliopisto", "language": "fi", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "University of Jyv\u00e4skyl\u00e4", "language": "en", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Fysiikka", "language": "fi", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Physics", "language": "en", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "yvv.contractresearch.collaborator", "value": "business", "language": "", "element": "contractresearch", "qualifier": "collaborator", "schema": "yvv"}, {"key": "yvv.contractresearch.funding", "value": "0", "language": "", "element": "contractresearch", "qualifier": "funding", "schema": "yvv"}, {"key": "yvv.contractresearch.initiative", "value": "business", "language": "", "element": "contractresearch", "qualifier": "initiative", "schema": "yvv"}, {"key": "dc.type.coar", "value": "http://purl.org/coar/resource_type/c_bdcc", "language": null, "element": "type", "qualifier": "coar", "schema": "dc"}, {"key": "dc.rights.accesslevel", "value": "openAccess", "language": null, "element": "rights", "qualifier": "accesslevel", "schema": "dc"}, {"key": "dc.type.publication", "value": "masterThesis", "language": null, "element": "type", "qualifier": "publication", "schema": "dc"}, {"key": "dc.subject.oppiainekoodi", "value": "4021", "language": "", "element": "subject", "qualifier": "oppiainekoodi", "schema": "dc"}, {"key": "dc.subject.yso", "value": "fysiikka", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "physics", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.format.content", "value": "fulltext", "language": null, "element": "format", "qualifier": "content", "schema": "dc"}, {"key": "dc.rights.url", "value": "https://rightsstatements.org/page/InC/1.0/", "language": null, "element": "rights", "qualifier": "url", "schema": "dc"}, {"key": "dc.type.okm", "value": "G2", "language": null, "element": "type", "qualifier": "okm", "schema": "dc"}]
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