78 documents found, page 1 of 8
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...
Microstructure, Mechanical, and Tribological Properties of Mo2N/Ag-SiNx Nanomul...
Fernandes, Filipe; Luan, Jing; Wang, Lei; Dong, Songtao; Ferreira, Fábio; Mo, Changpan; Cavaleiro, Albano; Ju, HongboThe multilayered Mo2N/Ag-SiNx self-lubricant films were designed and deposited using a DC (Direct Current) magnetron sputtering system under mixed gas atmosphere of N2 and Ar. The modulation ratio (thickness ratio of Mo2N to Ag-SiNx) was fixed at 2:1, while the modulation periods (thickness of Mo2N and its adjacent Ag-SiNx layer) were set at 20, 40, and 60 nm. The results indicated that all multilayer films, re...
Nitrogen alloyed MoSe2 coatings – Role of optimized morphology, structure and m...
Fernandes, Filipe; Yaqub, Talha Bin; Nadeem, Irfan; Yaqoob, Khurram; Kalin, Mitjan; Cavaleiro, AlbanoTransition metal dichalcogenide (TMD) coatings are gaining increasing interest among the scientific community as eco-friendly solutions for reducing friction, improving energy conservation, and lowering carbon footprints. N-alloyed MoSe2 coatings (MoSeN), a subset of TMDs, remain largely underexplored, with no research on their frictional performance across various sliding environments. Herein, an in-depth anal...
Mutually enhanced mechanical and tribological properties in magnetron sputtered...
Fernandes, Filipe; Luan, Jing; Wang, Lei; Dong, Songtao; Choukourov, Andrei; Yang, Junfeng; Kalin, Mitjan; Cavaleiro, Albano; Ju, HongboAchieving simultaneous enhancement of both mechanical and self-lubricating properties by incorporating soft lubricants into nitride films has been a longstanding challenge in the development of solid lubricant materials. This paper introduced a novel approach to overcome this challenge by developing coherent-structured Mo2N/Ag-SiNx multilayered films using radio frequency (RF) magnetron sputtering. The multilay...
Zirconium aluminum nitride thin films for temperature sensing applications
Fernandes, Filipe; Martins, Bruno; Patacas, Carlos; Cavaleiro, Albano; Faia, Pedro; Alves, Cristiana F. Almeida; Carbo-Argibay, EnriqueThis study explores the development and characterization of zirconium aluminum nitride (ZrAlN) thin films produced via magnetron sputtering for temperature sensing applications. The sensor film is integrated into a fully nitride multilayer coating and designed to work in harsh environments. The ZrAlN demonstrated stable semiconductor behavior up to 750 °C, making it suitable for high-temperature thermistors, wi...
Tribological performance of different alloyed DLC and AlTiSiN coatings when sli...
Fernandes, Filipe; Pérez-Salinas, Cristian; Evaristo, Manuel; Cavaleiro, Albano; Kumar, Ch. Sateesh; Lacalle, L. Norberto LópezMachining Ni alloys such as Inconel 718 is challenging due to its good mechanical properties, low thermal conductivity and low elastic modulus, which causes high cutting temperatures at the chip-tool interface. The use of self-lubricating coatings, such as DLCs coatings has potential to improve significantly the machinability of Ni alloys. This research work aims to explore how different DLC, DLC-Si, DLC-W coat...
Design of DC semi-industrial magnetron-sputtered W-Ti-N/Ag composite films: Ins...
Fernandes, Filipe; Luan, Jing; Wang, Yiping; Dong, Songtao; Evaristo, Manuel; Cavaleiro, Albano; Ju, HongboA semi-industrial magnetron sputtering system was employed to deposit a series of W-Ti-N/Ag composite films with varying Ag content, aiming to provide practical parameters for industrial-scale PVD applications. The films were deposited by DC sputtering a W + 30 wt%Ti alloy target and an Ag target in an Ar and N2 atmosphere. The results indicated that the composite films, regardless of Ag content, exhibited a fa...
Performance evaluation of TiAlSiN and TiSiN/TiSiVN coatings during high-speed d...
Fernandes, Filipe; Kumar, Ch. Sateesh; Lacalle, Luis Norberto López de; Cavaleiro, Albano; Cavaleiro, Diogo; Kalin, Mitjan; Prajapati, RamanandThis study investigates the tribo-mechanical performance of uncoated, TiAlSiN-coated, and TiSiN/TiSiVN multilayer-coated Al2O3/SiC ceramic tools during dry turning of AISI 316 L austenitic steel across three successive passes at varying cutting speeds. Key machining outputs, including cutting forces, surface roughness, cutting temperature, and tool wear (flank and crater), were analyzed with a focus on oxide fo...
Real-time temperature monitoring during titanium alloy machining with cutting t...
Fernandes, Filipe; Martins, Bruno; Patacas, Carlos; Cavaleiro, Albano; Faia, PedroThis study explores the integration of titanium aluminum nitride (TiAlN) and zirconium aluminum nitride (ZrAlN) thin-film sensors into cutting tools for real-time temperature monitoring during machining of Ti6Al4V titanium alloy. These sensors, integrated into a multilayer coating for electrical and wear shielding, were deposited directly onto the tool surfaces and calibrated for temperatures up to 750 °C. Due ...
Mutual promotion on the mechanical and tribological properties of the nacre-lik...
Hongbo, Ju; Luan, Jing; Wang, Yiping; Bondarev, Andrey; Evaristo, Manuel; Geng, Yaoxiang; Xu, Junhua; Cavaleiro, Albano; Fernandes, FilipeThe inverse relationship between the tribological and mechanical properties of environmentally friendly self-lubricant films, induced by the addition of soft lubricant agents that can diffuse quickly at elevated temperatures, has hindered the widespread use of these materials in industrial applications. This paper took this challenge to break through the above established relationship by developing novel nacre-...