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Titel: Synergic Effects of Nanosecond Laser Ablation and PVD-Coating on Cemented Carbides: Assessment on Surface and Mechanical Integrity
VerfasserIn: Fang, Shiqi
Llanes, Luis
Guo, Y. B.
Bähre, Dirk
Sprache: Englisch
Titel: Metals
Bandnummer: 14 (2024)
Heft: 1
Verlag/Plattform: MDPI
Erscheinungsjahr: 2023
Freie Schlagwörter: cemented carbide
laser ablation
coating
surface integrity
hardness
scratch
friction
wear
DDC-Sachgruppe: 500 Naturwissenschaften
Dokumenttyp: Journalartikel / Zeitschriftenartikel
Abstract: Emerging laser precision machining, particularly using pulsed lasers, enlightens the innovation and functionalization of cemented carbides. These backbone materials of the tooling industry are usually considered difficult to machine or shape using conventional mechanical approaches. The coating of cemented carbide tools, deemed to improve their mechanical and thermal properties, is a common supplementary surface treatment prior to their application. This work aims to study the synergic effects of nanosecond laser ablation and coating deposition on the surface, as well as the mechanical integrity of cemented carbides. In this regard, two plain WC–Co grades with different metallic binder content (10%wtCo and 15%wtCo) were first processed by a short-pulsed nanosecond laser. Subsequently, an AlTiN film was physically vapor-deposited on the laser-processed surfaces. The resulting surface integrity was assessed in terms of topographical, morphological, and microstructural changes. Mechanical integrity was evaluated in terms of indentation and sliding contact responses using Vickers hardness and scratch tests, respectively, the latter including frictional, penetrating, and sliding performances under selected surface processing conditions. In general, the nanosecond laser ablation proved to be beneficial for the mechanical integrity of coated cemented carbides in most studied cases, as it increased surface hardness, reduced penetration depth, and hindered damage during sliding. This was the case despite a slight increase in surface roughness, as well as minor morphological and microstructural changes at the coating–substrate interface, discerned.
DOI der Erstveröffentlichung: 10.3390/met14010034
URL der Erstveröffentlichung: https://doi.org/10.3390/met14010034
Link zu diesem Datensatz: urn:nbn:de:bsz:291--ds-415032
hdl:20.500.11880/37187
http://dx.doi.org/10.22028/D291-41503
ISSN: 2075-4701
Datum des Eintrags: 29-Jan-2024
Fakultät: NT - Naturwissenschaftlich- Technische Fakultät
Fachrichtung: NT - Materialwissenschaft und Werkstofftechnik
Professur: NT - Prof. Dr. Dirk Bähre
Sammlung:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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