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Sustainable and Environmentally Friendly Drilling of CFRP-Ti Stacks by DLC Coated Drills – A Tribomechanics Approach
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements. Department of Mechanical Engineering, CEMMPRE, University of Coimbra, Rua Luis Reis Santos, Coimbra, Portugal.ORCID iD: 0000-0003-0908-1065
2024 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Luleå: Luleå University of Technology, 2024.
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
URN: urn:nbn:se:ltu:diva-105738ISBN: 978-91-8048-593-7 (print)ISBN: 978-91-8048-594-4 (electronic)OAI: oai:DiVA.org:ltu-105738DiVA, id: diva2:1864039
Public defence
2024-09-04, E632, Luleå University of Technology, Luleå, 10:00 (English)
Opponent
Supervisors
Available from: 2024-06-03 Created: 2024-06-03 Last updated: 2024-06-05Bibliographically approved
List of papers
1. Surface Roughness Influence on Tribological Behavior of HiPIMS DLC Coatings
Open this publication in new window or tab >>Surface Roughness Influence on Tribological Behavior of HiPIMS DLC Coatings
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2023 (English)In: Tribology Transactions, ISSN 1040-2004, E-ISSN 1547-397X, Vol. 66, no 3, p. 565-575Article in journal (Refereed) Published
Abstract [en]

The application of diamond-like carbon (DLC) coatings in dry machining of difficult-to-machine materials has been gaining popularity due to high inertness, low coefficient of friction (COF), and high hardness of these coatings. Although the effect of surface roughness on the tribological properties of DLC coatings is of paramount importance, usually it is overlooked and coatings performance analysis was accomplished generally on highly polished substrates. The generation of polished surfaces is a time-consuming, labor-intensive process and, in most cases, not feasible for the industry due to its high cost. This article focuses on determining the effect of substrate (cemented carbide, WC-Co) surface roughness on the load-bearing capacity and tribological properties of DLC coatings deposited by High Power Impulse Magnetron Sputtering (HiPIMS) in Ne–Ar gas plasma. The DLC films were deposited onto WC-Co substrates with three different surface roughness profiles and their tribological performance were evaluated using a reciprocating tribotest. The high surface roughness resulted in increased wear rate due to high levels of asperities and increased potential for premature delamination of the coatings, while also causing severe damage to the counterbody due to inhibition of transfer film formation.

Place, publisher, year, edition, pages
Taylor & Francis, 2023
Keywords
Coefficient of friction, DLC coating, HiPIMS, surface roughness, WC-Co substrate, wear
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear) Manufacturing, Surface and Joining Technology
Research subject
Machine Elements
Identifiers
urn:nbn:se:ltu:diva-97262 (URN)10.1080/10402004.2023.2197472 (DOI)000982395600001 ()2-s2.0-85158865287 (Scopus ID)
Funder
EU, Horizon 2020, 860246
Note

Validerad;2023;Nivå 2;2023-05-22 (hanlid);

Funder: FCT–Fundação para a Ciência e a Tecnologia (UIDB/00285/2020, LA/P/0112/2020)

Available from: 2023-05-22 Created: 2023-05-22 Last updated: 2024-06-03Bibliographically approved
2. A Comparative study in the Tribological Behaviour of Different DLC Coatings Sliding Against Titanium Alloys
Open this publication in new window or tab >>A Comparative study in the Tribological Behaviour of Different DLC Coatings Sliding Against Titanium Alloys
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(English)Manuscript (preprint) (Other academic)
Keywords
Diamond like carbon; Coefficient of friction; Wear; cutting tools; Titanium alloys; HiPIMS
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Identifiers
urn:nbn:se:ltu:diva-105735 (URN)
Available from: 2024-06-02 Created: 2024-06-02 Last updated: 2024-06-03
3. Custom-tailored cross-cylinder tribotest to emulate wear mechanism in drilling of CFRP-Ti stacks
Open this publication in new window or tab >>Custom-tailored cross-cylinder tribotest to emulate wear mechanism in drilling of CFRP-Ti stacks
2023 (English)In: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 186, article id 108589Article in journal (Refereed) Published
Abstract [en]

While drilling of CFRP-Ti stacks, tool experiences complex tribomechanical interaction due to dissimilar workpiece constituents. For emulating tool wear behavior, the typical tribotest configuration such as reciprocating and pin-on-disc test are not representative for imitating contact scenario underwent during the drilling operation. Cross-cylinder tribotest is an effective test configuration to emulate contact in different manufacturing processes by providing fresh contact surface during sliding. In this work, for the first-time, tool wear of WC-Co cylinders was analyzed in cross-cylinder configuration against multi-material stack arrangement. Moreover, cross-cylinder testing against multi-material [CFRP-Ti]n workpiece showed cyclic variation in coefficient of friction against different workpiece constituents and wear mechanism is a combination of adhesive and abrasive wear on WC-Co tool, comparable to actual drilling operation.

Place, publisher, year, edition, pages
Elsevier, 2023
Keywords
Cross-cylinder tribotest, CFRP-Ti stacks, Difficult-to-machine materials, Wear
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
urn:nbn:se:ltu:diva-97629 (URN)10.1016/j.triboint.2023.108589 (DOI)001001426300001 ()2-s2.0-85159118215 (Scopus ID)
Funder
EU, Horizon 2020, 860246
Note

Validerad;2023;Nivå 2;2023-05-29 (joosat);

Funder: FCT – Fundaçao para a Ciencia e a Tecnologia, (UIDB/00285/2020, LA/P/0112/2020)

Available from: 2023-05-29 Created: 2023-05-29 Last updated: 2024-06-03Bibliographically approved
4. Emulating Wear Mechanism of DLC Coatings in Drilling of CFRP-Ti stacks by Using Cross-cylinder Tribotest
Open this publication in new window or tab >>Emulating Wear Mechanism of DLC Coatings in Drilling of CFRP-Ti stacks by Using Cross-cylinder Tribotest
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(English)Manuscript (preprint) (Other academic)
Keywords
Cross-cylinder tribotest, CFRP-Ti stacks, Drilling, DLC coatings, Wear mechanism, COF
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Identifiers
urn:nbn:se:ltu:diva-105736 (URN)
Available from: 2024-06-02 Created: 2024-06-02 Last updated: 2024-06-03
5. In-depth Tool Wear Analysis in Drilling of CFRP-Ti Stacks by DLC Coated Drills
Open this publication in new window or tab >>In-depth Tool Wear Analysis in Drilling of CFRP-Ti Stacks by DLC Coated Drills
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(English)Manuscript (preprint) (Other academic)
Keywords
CFRP-Ti stacks, Drilling, DLC coatings, Tool wear, HiPIMS, Arc deposition
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Identifiers
urn:nbn:se:ltu:diva-105737 (URN)
Available from: 2024-06-02 Created: 2024-06-02 Last updated: 2024-06-03

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