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Sustainable and Environmentally Friendly Drilling of CFRP-Ti Stacks by DLC Coated Drills – A Tribomechanics Approach
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement. Department of Mechanical Engineering, CEMMPRE, University of Coimbra, Rua Luis Reis Santos, Coimbra, Portugal.ORCID-id: 0000-0003-0908-1065
2024 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Ort, förlag, år, upplaga, sidor
Luleå: Luleå University of Technology, 2024.
Serie
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
Nationell ämneskategori
Tribologi (ytteknik omfattande friktion, nötning och smörjning)
Forskningsämne
Maskinelement
Identifikatorer
URN: urn:nbn:se:ltu:diva-105738ISBN: 978-91-8048-593-7 (tryckt)ISBN: 978-91-8048-594-4 (digital)OAI: oai:DiVA.org:ltu-105738DiVA, id: diva2:1864039
Disputation
2024-09-04, E632, Luleå University of Technology, Luleå, 10:00 (Engelska)
Opponent
Handledare
Tillgänglig från: 2024-06-03 Skapad: 2024-06-03 Senast uppdaterad: 2024-06-05Bibliografiskt granskad
Delarbeten
1. Surface Roughness Influence on Tribological Behavior of HiPIMS DLC Coatings
Öppna denna publikation i ny flik eller fönster >>Surface Roughness Influence on Tribological Behavior of HiPIMS DLC Coatings
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2023 (Engelska)Ingår i: Tribology Transactions, ISSN 1040-2004, E-ISSN 1547-397X, Vol. 66, nr 3, s. 565-575Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
Taylor & Francis, 2023
Nyckelord
Coefficient of friction, DLC coating, HiPIMS, surface roughness, WC-Co substrate, wear
Nationell ämneskategori
Tribologi (ytteknik omfattande friktion, nötning och smörjning) Bearbetnings-, yt- och fogningsteknik
Forskningsämne
Maskinelement
Identifikatorer
urn:nbn:se:ltu:diva-97262 (URN)10.1080/10402004.2023.2197472 (DOI)000982395600001 ()2-s2.0-85158865287 (Scopus ID)
Forskningsfinansiär
EU, Horisont 2020, 860246
Anmärkning

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

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

Tillgänglig från: 2023-05-22 Skapad: 2023-05-22 Senast uppdaterad: 2024-06-03Bibliografiskt granskad
2. A comparative study in the tribological behaviour of different DLC coatings sliding against titanium alloys
Öppna denna publikation i ny flik eller fönster >>A comparative study in the tribological behaviour of different DLC coatings sliding against titanium alloys
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2024 (Engelska)Ingår i: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 554-555, artikel-id 205468Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

In this study, the tribological behaviour of different Diamond-like-Carbon (DLC) coatings sliding against titanium alloy (Ti6Al4V) was analysed in a pin-on-disc tribometer at different applied loads to study effectiveness of tool coatings in titanium alloys machining. Three different DLC coatings were deposited on cemented carbide substrate using HiPIMS (DLC-Ar, DLC-Ne) and arc (DLC-Bn) deposition techniques. A detailed analysis of the wear track and titanium countersurfaces were performed following the tribotest to develop understanding about the wear mechanism and associated variation in the friction response. The results indicated that DLC-Ar presents low friction and reduced wear of coating and respective titanium countersurface at lowest load, seemingly due to its inherent tendency to spontaneously form graphitic transfer-layer at the interface. With an increase in the applied load, the tendency to retain tribofilm decreases as shearing ensue quickly exposing the underneath substrate material. The wear performance of DLC-Ne coatings is better than DLC-Ar under highest load and friction behaviour relatively close to DLC-Ar coatings. In comparison, under increased applied loads, DLC-Bn coatings offered better wear resistance and low friction compared with DLC-Ne and DLC-Ar coatings, which would offer improved performance in machining of titanium alloys.

Ort, förlag, år, upplaga, sidor
Elsevier, 2024
Nyckelord
Diamond like carbon, Coefficient of friction, Wear, cutting tools, Titanium alloys, HiPIMS
Nationell ämneskategori
Tribologi (ytteknik omfattande friktion, nötning och smörjning)
Forskningsämne
Maskinelement
Identifikatorer
urn:nbn:se:ltu:diva-105735 (URN)10.1016/j.wear.2024.205468 (DOI)2-s2.0-85197086252 (Scopus ID)
Forskningsfinansiär
EU, Horisont 2020, 860246
Anmärkning

Validerad;2024;Nivå 2;2024-07-08 (joosat);

Funder: Fundaçao para a Ciencia e a Tecnologia (UIDB/00285/2020 and LA/P/0112/2020);

Full text: CC BY-NC License;

This article has previously appeared as a manuscript in a thesis.

Tillgänglig från: 2024-06-02 Skapad: 2024-06-02 Senast uppdaterad: 2024-07-08Bibliografiskt granskad
3. Custom-tailored cross-cylinder tribotest to emulate wear mechanism in drilling of CFRP-Ti stacks
Öppna denna publikation i ny flik eller fönster >>Custom-tailored cross-cylinder tribotest to emulate wear mechanism in drilling of CFRP-Ti stacks
2023 (Engelska)Ingår i: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 186, artikel-id 108589Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
Elsevier, 2023
Nyckelord
Cross-cylinder tribotest, CFRP-Ti stacks, Difficult-to-machine materials, Wear
Nationell ämneskategori
Tribologi (ytteknik omfattande friktion, nötning och smörjning)
Forskningsämne
Maskinelement
Identifikatorer
urn:nbn:se:ltu:diva-97629 (URN)10.1016/j.triboint.2023.108589 (DOI)001001426300001 ()2-s2.0-85159118215 (Scopus ID)
Forskningsfinansiär
EU, Horisont 2020, 860246
Anmärkning

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

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

Tillgänglig från: 2023-05-29 Skapad: 2023-05-29 Senast uppdaterad: 2024-06-03Bibliografiskt granskad
4. Emulating Wear Mechanism of DLC Coatings in Drilling of CFRP-Ti stacks by Using Cross-cylinder Tribotest
Öppna denna publikation i ny flik eller fönster >>Emulating Wear Mechanism of DLC Coatings in Drilling of CFRP-Ti stacks by Using Cross-cylinder Tribotest
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(Engelska)Manuskript (preprint) (Övrigt vetenskapligt)
Nyckelord
Cross-cylinder tribotest, CFRP-Ti stacks, Drilling, DLC coatings, Wear mechanism, COF
Nationell ämneskategori
Tribologi (ytteknik omfattande friktion, nötning och smörjning)
Identifikatorer
urn:nbn:se:ltu:diva-105736 (URN)
Tillgänglig från: 2024-06-02 Skapad: 2024-06-02 Senast uppdaterad: 2024-06-03
5. In-depth Tool Wear Analysis in Drilling of CFRP-Ti Stacks by DLC Coated Drills
Öppna denna publikation i ny flik eller fönster >>In-depth Tool Wear Analysis in Drilling of CFRP-Ti Stacks by DLC Coated Drills
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(Engelska)Manuskript (preprint) (Övrigt vetenskapligt)
Nyckelord
CFRP-Ti stacks, Drilling, DLC coatings, Tool wear, HiPIMS, Arc deposition
Nationell ämneskategori
Tribologi (ytteknik omfattande friktion, nötning och smörjning)
Identifikatorer
urn:nbn:se:ltu:diva-105737 (URN)
Tillgänglig från: 2024-06-02 Skapad: 2024-06-02 Senast uppdaterad: 2024-06-03

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Khan, Sharjeel Ahmed

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12345673 av 16
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