izpis_h1_title_alt

Effect of the slide-to-roll ratio and the contact kinematics on the elastohydrodynamic friction in diamond-like-carbon contacts with different wetting behaviours
Polajnar, Marko (Avtor), Kalin, Mitjan (Avtor)

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Izvleček
In this paper, we show how the slide-to-roll ratio (SRR), the contact kinematics and the surface energy all have important effects on the elastohydrodynamic friction. As reported previously, diamond-like-carbon (DLC) contacts of the type DLC/DLC provide the lowest coefficient of friction, in particular those DLC materials with the lowest surface energies (three different DLC coatings were used in this study). A friction reduction of up to 48 %, compared to a steel/steel contact, was obtained. A surprising new finding from this investigation is that the friction in DLC contacts is significantly reduced for high SRRs, i.e. a difference of up to 27 % was measured in the DLC/DLC contacts when the SRR increased from 0.5 (rolling prevails) to 1.8 (sliding prevails). However, even more surprising is the effect of the SRR on the friction in mixed steel/DLC contacts, which is related to the contact design and its kinematics. We found that if the DLC is coated on the slower surface, a high SRR will not reduce the friction to any significant extent, typically about 5 %, and at most 13 %, compared to steel/steel contacts. However, a significant friction reduction is observed when applying a low-surface-energy DLC coating to the faster surface-on average about 20 % and as high as 33 %. In this case (a high SRR and DLC on the faster surface), mixed steel/DLC surfaces can experience a very similar friction as that seen for DLC/DLC contacts. Qualitatively, the same behaviour was found for both positive and negative SRR values.

Jezik:Angleški jezik
Ključne besede:EHD lubrication, DLC, surface energy, wetting, slide-to-roll ratio
Vrsta gradiva:Članek v reviji (dk_c)
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:FS - Fakulteta za strojništvo
Leto izida:2015
Št. strani:str. 1-10
Številčenje:Vol. 60, iss. 1
UDK:539.92(045)
ISSN pri članku:1023-8883
DOI:10.1007/s11249-015-0593-3 Povezava se odpre v novem oknu
COBISS.SI-ID:14197019 Povezava se odpre v novem oknu
Število ogledov:11
Število prenosov:4
Metapodatki:XML RDF-CHPDL DC-XML DC-RDF
 
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Gradivo je del revije

Naslov:Tribology letters
Skrajšan naslov:Tribol. lett.
Založnik:Baltzer, Baltzer Science Publishers
ISSN:1023-8883
COBISS.SI-ID:2806555 Novo okno

Gradivo je financirano iz projekta

Financer:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Program financ.:Raziskovalni projekti - aplikativni
Številka projekta:P2-0231
Naslov:Tribologija
Akronim:
ID projekta:info:eu-repo/grantAgreement/ARRS/Raziskovalni%20projekti%20-%20aplikativni/P2-0231

Sekundarni jezik

Jezik:Slovenski jezik
Ključne besede:tribologija, mazanje, DLC prevleke

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