A5019575070- Metal and Thin Film Mechanics
- Diamond and Carbon-based Materials Research
- Solar Thermal and Photovoltaic Systems
- Tribology and Wear Analysis
- MXene and MAX Phase Materials
- Semiconductor materials and devices
- Thermal Radiation and Cooling Technologies
- solar cell performance optimization
- Solar-Powered Water Purification Methods
- Thin-Film Transistor Technologies
- Photovoltaic System Optimization Techniques
- Copper Interconnects and Reliability
- Lubricants and Their Additives
- Boron and Carbon Nanomaterials Research
- Silicon and Solar Cell Technologies
- Advanced ceramic materials synthesis
- Adhesion, Friction, and Surface Interactions
- GaN-based semiconductor devices and materials
- Optical properties and cooling technologies in crystalline materials
- Quantum Mechanics and Applications
- ZnO doping and properties
- Quantum Information and Cryptography
- Cold Atom Physics and Bose-Einstein Condensates
- Gas Sensing Nanomaterials and Sensors
- Intermetallics and Advanced Alloy Properties
University of Coimbra
2020-2023
University of Minho
2017-2020
University of Sussex
2012
Self-lubricant films combine the intrinsic properties of high oxidation resistance coatings with lubricious elements deposited as monolayer and/or multilayered configuration, offering an opportunity to design green coating materials. The present paper reports influence Ag additions (range 0–3.2 at.%), considered low friction material, on morphology, structure, mechanical properties, thermal stability and TiSiN/TiN(Ag) by sputtering. surface morphology progressively changed from a...
In this work, the influence of Ag additions into CrAlN coatings on surface morphology, chemical composition, structure, hardness and oxidation behaviour was studied. Increasing content decreased size morphological features produced a more compact coatings. All displayed fcc structure typical transition metal nitrides; silver phase indexed for with concentration ≥8.6 at.%. XPS results confirmed that existed as nanoclusters within coating structure. A maximum around 23 GPa observed 8.6 at.%...
In this study, we compare the tribological performance of a multilayer TiSiN/Ti(Ag)N coating with TiSiN/TiN similar Si content in order to demonstrate effect solid lubricant phase, silver. For Al2O3 balls, hardness and reduced modulus determine coatings for tests conducted at room temperature (RT) against balls. At 550 °C, failed, whereas Ag-containing performed better due presence Ag contact, which decreased shear stress and, consequently, friction. TiAl6V4 was always than one. wear track...
In this work, the effect of Ag content on morphology, structure, mechanical properties, thermal stability, and oxidation resistance multilayered TiSiN/TiN(Ag) films, with Si concentration in range 6.3–7.0 at.%, is investigated. The coatings are deposited by DC reactive magnetron sputtering, increasing from 0 to 13.9 at.%. All exhibit a face-centered cubic structure (f.c.c NaCl type) diffraction peaks progressively increase content. hardness reduced elastic modulus as-deposited films decrease...
Abstract In the last decades, vanadium alloyed coatings have been introduced as potential candidates for self-lubrication due to their perfect tribological properties. this work, influence of V incorporation on wear performance and oxidation resistance TiSiN/CrN film deposited by direct current (DC) reactive magnetron sputtering is investigated. The results show that significantly decreases coatings. general, two layers are formed during process: i) Ti(V)O 2 top, followed a protective layer,...
The influence of V content on the morphology, structure, hardness (H) and reduced Young's modulus (E), adhesion, oxidation resistance TiAlSiN coatings is investigated. were produced by DC reactive magnetron sputtering, with increasing contents from 0, 4.8 11.0 at.%. All exhibit a fcc type structure. coating at.% shows highest values H E, whereas are similar for reference V. adhere well to substrates show dense compact columnar growth extending adhesive interlayer top surface coatings....
The work presents a detailed analysis of the synthesis, compositional, morphological, structural, mechanical and diverse atmosphere sliding characteristics reactive sputtered W–S–N coatings. aim is to perform an organized study explore performance in three different environments (room temperature, 200 °C dry N2) disseminate results promote application TMD-N coatings for actual industrial implementation. All are sub-stoichiometric sulphur with respect WS2 phase. show highly compact...
This work deals with the investigation of tribological performance DC magnetron sputtered W-S-N coatings under vacuum atmosphere, as part exploration multi-environment sliding properties solid lubricants. study is systematic testing lubricants in different environments, especially vacuum, which often ignored. The trend to test dry N2 by considering it replacement environment testing. approach not appropriate. In this work, a set was synthesized N-alloying content range 0–25.5 at.%. A maximum...