DC Field | Value | Language |
---|---|---|
dc.contributor.author | Jafari, M | - |
dc.contributor.author | Enayati, MH | - |
dc.contributor.author | Salehi, M | - |
dc.contributor.author | Nahvi, SM | - |
dc.contributor.author | Park, CG | - |
dc.date.accessioned | 2016-03-31T07:56:00Z | - |
dc.date.available | 2016-03-31T07:56:00Z | - |
dc.date.created | 2015-02-04 | - |
dc.date.issued | 2014-08 | - |
dc.identifier.issn | 0272-8842 | - |
dc.identifier.other | 2014-OAK-0000030889 | - |
dc.identifier.uri | https://oasis.postech.ac.kr/handle/2014.oak/14190 | - |
dc.description.abstract | In this research, microstructural evolution of nanosized tungsten carbide during heatup stage of sintering of a novel electroless nickel-coated nanostructured WC-Co powder was investigated. Toward this purpose, a mechanical milling process was executed on commercial microcrystalline WC-Co (mc-WC) to achieve nanostructured WC-Co (nc-WC) powder. Electroless nickel plating was performed on the asmilled powder to obtain nickel-coated nanostructured WC-Co (Ni/nc WC). The nc-WC and Ni/nc WC powders were subjected to cold-pressing in a uniaxial die followed by heatup stage of sintering from 25 degrees C to a temperature range of 1000-1300 degrees C under argon atmosphere. The microstructural characterizations were carried out by X-ray diffractometry (XRD), high resolution field emission scanning electron microscopy (HR FESEM) and high resolution transmission electron microscopy (HRTEM). The ball milling process resulted in the formation of nc-WC powder containing nanosized WC with average grain size of similar to 15 nm. A uniform nickel layer with a thickness of <100 am was formed around Ni/nc WC particles through nickel plating. A two-step grain growth trend was observed during heatup of nc-WC: a slow grain growth step at temperatures <= 1000 degrees C, which led to WC grain size of similar to 76 nm, and a rapid step by heating to the temperature range of 1100-1300 degrees C which caused a substantial increase in WC grain size to similar to 925 am. In contrast, WC grain size in Ni/nc WC sample varied in the range of similar to 15-250 nm with temperature rising from 25 to 1300 degrees C representing about 72% reduction in WC grain size for Ni/nc WC compared to nc-WC. In case of nc-WC, surface faceting of nanosized WC occurred upon heating to <= 1000 degrees C; meanwhile, on heating to 1100-1300 degrees C, the coalescence mechanism was operative accounting for the rapid grain growth. As for Ni/nc WC, surface faceting of WC grains was greatly suppressed. This led to the retardation of the coalescence mechanism, making it possible to form ultrafine-grained Ni/nc WC material. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved. | - |
dc.description.statementofresponsibility | X | - |
dc.language | English | - |
dc.publisher | ELSEVIER SCI LTD | - |
dc.relation.isPartOf | CERAMICS INTERNATIONAL | - |
dc.subject | Sintering | - |
dc.subject | Carbides | - |
dc.subject | Grain growth | - |
dc.subject | Microstructure-final | - |
dc.subject | Electroless plating | - |
dc.subject | NANOCRYSTALLINE WC | - |
dc.subject | GRAIN-GROWTH | - |
dc.subject | MECHANICAL-PROPERTIES | - |
dc.subject | CEMENTED CARBIDES | - |
dc.subject | COMPOSITES | - |
dc.subject | COATINGS | - |
dc.subject | ALLOYS | - |
dc.subject | SIZE | - |
dc.subject | CONSOLIDATION | - |
dc.subject | DENSIFICATION | - |
dc.title | Microstructural evolution of nanosized tungsten carbide during heatup stage of sintering of electroless nickel-coated nanostructured WC-Co powder | - |
dc.type | Article | - |
dc.contributor.college | 신소재공학과 | - |
dc.identifier.doi | 10.1016/J.CERAMINT.2014.03.118 | - |
dc.author.google | Jafari, M | - |
dc.author.google | Enayati, MH | - |
dc.author.google | Salehi, M | - |
dc.author.google | Nahvi, SM | - |
dc.author.google | Park, CG | - |
dc.relation.volume | 40 | - |
dc.relation.issue | 7 | - |
dc.relation.startpage | 11031 | - |
dc.relation.lastpage | 11039 | - |
dc.contributor.id | 10069857 | - |
dc.relation.journal | CERAMICS INTERNATIONAL | - |
dc.relation.index | SCI급, SCOPUS 등재논문 | - |
dc.relation.sci | SCI | - |
dc.collections.name | Journal Papers | - |
dc.type.rims | ART | - |
dc.identifier.bibliographicCitation | CERAMICS INTERNATIONAL, v.40, no.7, pp.11031 - 11039 | - |
dc.identifier.wosid | 000337015300107 | - |
dc.date.tcdate | 2019-01-01 | - |
dc.citation.endPage | 11039 | - |
dc.citation.number | 7 | - |
dc.citation.startPage | 11031 | - |
dc.citation.title | CERAMICS INTERNATIONAL | - |
dc.citation.volume | 40 | - |
dc.contributor.affiliatedAuthor | Park, CG | - |
dc.identifier.scopusid | 2-s2.0-84900469704 | - |
dc.description.journalClass | 1 | - |
dc.description.journalClass | 1 | - |
dc.description.wostc | 10 | - |
dc.description.scptc | 8 | * |
dc.date.scptcdate | 2018-05-121 | * |
dc.type.docType | Article | - |
dc.subject.keywordPlus | NANOCRYSTALLINE WC | - |
dc.subject.keywordPlus | GRAIN-GROWTH | - |
dc.subject.keywordPlus | MECHANICAL-PROPERTIES | - |
dc.subject.keywordPlus | CEMENTED CARBIDES | - |
dc.subject.keywordPlus | COMPOSITES | - |
dc.subject.keywordPlus | COATINGS | - |
dc.subject.keywordPlus | ALLOYS | - |
dc.subject.keywordPlus | SIZE | - |
dc.subject.keywordPlus | CONSOLIDATION | - |
dc.subject.keywordPlus | DENSIFICATION | - |
dc.subject.keywordAuthor | Sintering | - |
dc.subject.keywordAuthor | Carbides | - |
dc.subject.keywordAuthor | Grain growth | - |
dc.subject.keywordAuthor | Microstructure-final | - |
dc.subject.keywordAuthor | Electroless plating | - |
dc.relation.journalWebOfScienceCategory | Materials Science, Ceramics | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.relation.journalResearchArea | Materials Science | - |
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