69 documents found, page 1 of 7
Customisation of PVD coatings for biomedical devices
Santo, Daniela; Castro, José D.; Cruz, Sandra; Carvalho, Isabel; Cavaleiro, Albano; Carvalho, SandraIn recent years, physical vapor deposition (PVD) has emerged as a powerful technique for surface modification, offering a wide range of possibilities to improve the properties of medical devices. This review explores the fundamentals and versatility of PVD coatings in biomedical applications, highlighting their potential to revolutionise the field. Biocompatibility is crucial in successfully integrating medical...
Sustainable lubrication through Gd DLC films and ionic liquids for wear and cor...
Omiya, Takeru; Cavaleiro, Albano; Figueiredo, Nuno M.; Gouttebaron, Rachel; Felten, Alexandre; Ferreira, FábioThis study examines the integration of ionic liquids (ILs) with gadolinium diamond-like carbon (Gd-DLC) films as a means of addressing the environmental drawbacks associated with conventional additives, such as zinc dialkyldithiophosphates. Tribological testing initially revealed that higher concentrations of gadolinium in the DLC resulted in improved wear resistance. Further observation of the wear tracks conf...
Tribological study of W-S-(C) sputtered coatings sliding against aluminium at e...
Vuchkov, Todor; Sunny, Saniat Jahan; Cavaleiro, AlbanoAluminium metal forming is often performed at elevated temperatures which can cause significant galling, damage to the produced parts and increased manufacturing costs. Self-lubricating thin films deposited by magnetron sputtering are good candidates for alleviating this issue. In this study we deposited three types of films containing transition metal dichalcogenides, of which one consisted only of WSx and two...
Exploring tribological characteristics of ZrN-MoSN composite films fabricated v...
Luan, Jing; Lu, Hongying; Xu, Junhua; Fernandes, Filipe; Evaristo, Manuel; Ma, Bingyang; Xie, Fuxiang; Cavaleiro, Albano; Ju, HongboAchieving the stringent demands of sustainable tribological industrial applications poses a significant challenge, particular in optimizing the self-lubricant performance of nitride-based films. This paper tackled this challenge by designing and depositing a series of ZrN-MoSN composite films with varying (Mo + S)/Zr ratios, employing RF magnetron sputtering, aimed to enhance the tribological properties through...
Can ZrAlN thin films be used as thermistor sensors for temperature assessment?
Martins, Bruno; Patacas, Carlos; Cavaleiro, Albano; Faia, Pedro; Bondarchuk, Oleksandr; Fernandes, FilipeThe electrical characteristics and conduction mechanisms of ZrAlN thin films for their potential use as thermistor sensors were assessed. Various compositions of Zr1-xAlxN were synthesized by sputtering and studied up to 200 °C to understand their sensitivity and applicability. Among the compositions studied, the ones with x = 0.34 and x = 0.46 showed the highest sensitivities, reaching values close to 3000 K. ...
Expanding the applications of the wear-resistant titanium aluminum nitride thin...
Martins, Bruno; Patacas, Carlos; Cavaleiro, Albano; Faia, Pedro; Zorro, Fátima; Carbo-Argibay, Enrique; FGerreira, Paulo J.; Fernandes, FilipeThis study investigates an approach to temperature sensing by integrating Titanium Aluminum Nitride (TiAlN), originally engineered for wear and corrosion applications, as a temperature sensor within a multilayered thin film system. A nitride multilayer system was developed by physical vapor deposition (PVD) using a single four-target magnetron sputtering chamber; intermediate vacuum interruption steps were empl...
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...
Exploring tribological characteristics of ZrN-MoSN composite films fabricated v...
Luan, Jing; Lu, Hongying; Xu, Junhua; Fernandes, Filipe; Fernandes, Filipe; Evaristo, Manuel; Ma, Bingyang; Xie, Fuxiang; Cavaleiro, Albano; Ju, HongboAchieving the stringent demands of sustainable tribological industrial applications poses a significant challenge, particular in optimizing the self-lubricant performance of nitride-based films. This paper tackled this challenge by designing and depositing a series of ZrN-MoSN composite films with varying (Mo + S)/Zr ratios, employing RF magnetron sputtering, aimed to enhance the tribological properties through...
Nano-multilayered ZrN‒Ag/Mo‒S‒N film design for stable anti-frictional performa...
Ju, Hongbo; Luan, Jing; Xu, Junhua; Cavaleiro, Albano; Evaristo, Manuel; Fernandes, Filipe; Fernandes, FilipeA multilayer film, composed by ZrN-Ag (20 nm) and Mo-S-N (10 nm) layers, combining the intrinsic lubricant characteristics of each layer was deposited using DC magnetron sputtering system, to promote lubrication in a wide-range of temperatures. The results showed that the ZrN-Ag/Mo-S-N multilayer film exhibited a sharp interface between the different layers. A face-centered cubic (fcc) dual-phases of ZrN and Ag...
Design and magnetron sputtering of nanomultilayered W2N/Ag-SiNx films: Microstr...
Luan, Jing; Kong, Fanlin; Evaristo, Manuel; Fernandes, Filipe; Zhou, Yazhou; Cavaleiro, Albano; Ju, Hongbo; Fernandes, FilipeNovel multilayered films were engineered by integrating W2N and Ag-SiNx layers in a multilayer structure to obtain improved hardness and tribological properties. The films were fabricated by alternating magnetron sputtering, depositing 40 nm layers of W2N with varying thickness of Ag-SiNx layers varying in thickness from 4 to 20 nm. The effect of the increase thickness of the Ag-SiNx layers in the films microst...