11 documents found, page 1 of 2
Influence of 1-Ethyl-3-methylimidazolium Diethylphosphate Ionic Liquid on the P...
Sadeghi, Mohammadamin; Omiya, Takeru; Fernandes, Filipe; Vilhena, Luís; Ramalho, Amílcar; Ferreira, FábioA composite lubricating system that combines solid and liquid lubrication can create a synergistic effect by leveraging the strengths of both types of lubricants. Solid lubrication coatings possess advantageous load-bearing abilities and exhibit low volatility. By adopting this approach, the system retains the merits of solid lubrication while simultaneously harnessing the advantages of liquid lubrication. The ...
Tribological Comparison of Coatings Produced by PVD Sputtering for Application ...
Ferreira, Ney Francisco; Neis, Patric Daniel; Fernandes, Filipe; Poletto, Jean Carlos; Yaqub, Talha Bin; Cavaleiro, Albano; Vilhena, LuísThis article compares the tribological performance of coatings produced by PVD sputtering. Transition metal dichalcogenide (TMD) coatings doped with carbon (WSC and MoSeC) and nitrogen (WSN and MoSeN) and a conventional diamond-like carbon (DLC) coating are compared. The tribological evaluation was oriented towards the use of coatings on piston rings. Block-on-ring tests in a condition lubricated with an additi...
Impact of Temperature Variation on Friction Behaviour of Rare Earth-Doped Diamo...
Shaikh, Shahsharif; Omiya, Takeru; Cavaleiro, Albano; Vilhena, Luis M.; Ramalho, Amílcar; Ferreira, FábioThis research paper investigates the tribological performance of diamond-like carbon (DLC) coatings doped with rare earth metals (europium and gadolinium) as well as pure DLC lubricated with ionic liquid additives (trihexyltetradecylphosphonium bis(2-ethylhexyl) phosphate {[P66614][DEHP]} and 1-ethyl-3-methylimidazolium diethyl phosphate {[EMIM][DEP]}) in Polyalphaolefin 8 (PAO8). The study aims to examine the ...
Tribological Behavior of Doped DLC Coatings in the Presence of Ionic Liquid Add...
Sadeghi, Mohammadamin; Omiya, Takeru; Fernandes, Filipe; Vilhena, Luis M.; Ramalho, Amílcar; Ferreira, FábioDiamond-like carbon (DLC) coatings are widely used in industries that require high durability and wear resistance, and low friction. The unique characteristics of DLC coatings allow for the possibility of creating adsorption sites for lubricant additives through the doping process. In this study, the combined use of europium-doped diamond-like carbon (Eu-DLC), gadolinium-doped diamond-like carbon (Gd-DLC), and ...
Investigating the Synergistic Effect of Electrochemical Texturing and MoSeC Coa...
Mahadeshwara, Manoj Rajankunte; Rosa, Fátima Margarida dos Santos; Vuchkov, Todor; Vilhena, Luis M.; Ramalho, Amílcar; Sharma, Pooja; Cavaleiro, AlbanoThe materials used for the piston cylinders of automobile engines, or the ring and tappets of various mechanical components, are continuously experiencing lubricated sliding motions. These surfaces are prone to damage due to the various tribological aspects of friction and wear. Hence, enhancing their surface properties would contribute to increasing their life and saving energy and resources. For many decades ...
Structural, thermal, and mechanical characterisation of PEEK-based composites i...
Nikonovich, Maksim; Costa, Joana F. S.; Fonseca, Ana C.; Ramalho, Amílcar; Emami, NazaninThermal, thermo-mechanical and mechanical properties of four different commercially available polyetheretherketones (PEEK) based materials were investigated. PEEK matrix was either modified and/or reinforced with carbon fibres, graphite and/or PTFE. Impact strength was measured at three different temperatures: 25 ◦C, 100 ◦C, and 195 ◦C. At 25 ◦C, thermal stability and mechanical properties, including the elasti...
Silver oxide coatings deposited on leathers to prevent diabetic foot infections
Carvalho, Isabel; Lima, M. José; Nobre, David; Marques, S. Mariana; Castro, Débora; Leite, Teófilo R.; Henriques, Mariana; Duarte, FernandoDiabetic foot is one of the most serious complications of diabetes, the appearance of foot ulcers is highly susceptible to the prevalence of infections. In this sense, thin films of silver (Ag) and silver oxide (AgOx) were deposited by the dc reactive magnetron sputtering technique on different leather substrates for application in insoles and/or footwear inside in order to functionalize them, thus promoting an...
Mechanical and Tribological Characterization of a Bioactive Composite Resin
Carneiro, Elsa Reis; Coelho, Ana Sofia; Amaro, Inês; Paula, Anabela Baptista; Marto, Carlos Miguel; Saraiva, José; Ferreira, Manuel MarquesDespite developments and advances in dental materials which allow for greater restorative performance, there are still challenges and questions regarding the formulation of new compositions and chemical reactions of materials used in restorative dentistry. The aim of this study was to assess and compare the mechanical and tribological characteristics of a bioactive resin, a composite resin, and a glass ionomer....
A study on the influence of prosthetic interface material in transtibial ampute...
Cavaco, Adriana; Durães, Luísa; Ramalho, Amílcar; Pais, SandraInterfaces of transtibial prosthesis have an important role in the transmission of ground reaction forces, damping gait loads and tissue protection.
Ex-vivo studies on friction behaviour of ureteral stent coated with Ag clusters...
Carvalho, Isabel; Faraji, Mostafa; Ramalho, Amílcar; Carvalho, António; Carvalho, Sandra; Cavaleiro, AlbanoCoated ureteral stents must be placed in the human body without hurting the body tissue and, simultaneously, support the application without degrading the top active layer. In this work Ag clusters incorporated in a:C (Ag/ a:C) matrix were produced by plasma gas condensation process. After optimizing some deposition parameters, as cluster source pressure and power density, two different clusters sizes were obta...