A5001994314- High-Temperature Coating Behaviors
- Diamond and Carbon-based Materials Research
- Tribology and Wear Analysis
- Advanced materials and composites
- Orbital Angular Momentum in Optics
- Advanced Electron Microscopy Techniques and Applications
- Near-Field Optical Microscopy
- Lubricants and Their Additives
- High Entropy Alloys Studies
- Metamaterials and Metasurfaces Applications
- Digital Holography and Microscopy
- Advanced ceramic materials synthesis
- Flame retardant materials and properties
- Metal Alloys Wear and Properties
- Electron and X-Ray Spectroscopy Techniques
- Advanced X-ray Imaging Techniques
- Additive Manufacturing and 3D Printing Technologies
- Magnetic properties of thin films
- Metal and Thin Film Mechanics
- Additive Manufacturing Materials and Processes
- Plasmonic and Surface Plasmon Research
- Scientific Research and Philosophical Inquiry
- Fluid Dynamics and Heat Transfer
- Glass properties and applications
- Particle Dynamics in Fluid Flows
University of Nottingham
2019-2025
The University of Texas at Arlington
2020-2024
University of Modena and Reggio Emilia
2014-2022
Istituto Nanoscienze
2016-2018
University of Ottawa
2017
Institute for Advanced Studies in Basic Sciences
2017
Institute of Materials for Electronics and Magnetism
2017
University of Rochester
2017
National Academies of Sciences, Engineering, and Medicine
2016
University of Bologna
2014
Abstract Electron waves that carry orbital angular momentum (OAM) are characterized by a quantized and unbounded magnetic dipole moment parallel to their propagation direction. When interacting with materials, the wavefunctions of such electrons inherently modified. Such variations therefore motivate need analyse electron wavefunctions, especially wavefronts, obtain information regarding material’s structure. Here, we propose, design demonstrate performance device based on nanoscale...
Abstract Electron waves give an unprecedented enhancement to the field of microscopy by providing higher resolving power compared their optical counterpart. Further information about a specimen, such as electric and magnetic features, can be revealed in electron because electrons possess both moment charge. In-plane structures materials studied experimentally using effect Lorentz force. On other hand, full mapping has hitherto remained challenging. Here we measure nanoscale out-of-plane...
Free electron beams that carry high values of orbital angular momentum (OAM) possess large magnetic moments along the propagation direction. This makes them an ideal probe for measuring electronic and properties materials, as well fundamental experiments in magnetism. However, their generation requires use complex diffractive elements, which usually take form nano-fabricated holograms. Here, we show how limitations current fabrication such holograms can be overcome by using beam lithography....
WC-Co coatings have been used as wear resistant in aero engines for decades, and research is still ongoing to further improve the performance of these through compositional modifications reduce wear. The are unlubricated sliding protection compressor parts such as; compressor, disc mid-span stiffeners aerofoils. In this study, two different graphene nanoplatelets (GNPs) were introduced into (88–12 wt %) coating a hybrid thermal spray technique. Under correct injection conditions, HVOF leads...
ABSTRACT Final year individual projects have always been the culmination of a student's curriculum at university, requiring knowledge and skills gained over whole course. However, with time, their scope aim moved from more traditional research‐oriented one to modular structure, where specific are demonstrated assessed. This work contributes understanding current role research, cutting‐edge research in particular, final an engineering context: its importance, value contribution student...
Due to the restrictions and mediocre performance of current methods coating complex shaped parts in which line sight processes currently struggle, development new is essential, with High Velocity Oxy-Fuel (HVOF) thermal spray coatings being a good candidate. In this study, compact Oxy-Air Fuel (HVOAF) torch designed coat internal surfaces was traversed within cylindrical pipes diameters (IDs) 70 mm, 90 mm 110 WC-10Co-4Cr applied commercially available powder feedstock. Powder microstructures...
NiCrFeSiB alloys reinforced with WC-Co are potentially useful composite coating materials for use in applications which resistance to sliding wear, hot corrosion and high temperature is required. Furthermore these offer an advantage over WC-CoCr coatings where a more ductile A powder feedstock containing 50/50 mixture of WC-Co/NiCrFeSiB was sprayed by HVOAF (high velocity oxy-air fuel) thermal spray torch, developed Monitor Coatings Castolin Eutectic internal diameter applications, two sets...
Nickel based superalloy are in demand for high temperature applications and their corrosion, erosion wear resistance have been investigated a long time. chromium (NiCr) alloys widely used corrosion resistant coatings, while carbide nickel (CrC-NiCr) preferred coatings at temperature. In this study CrNiAlCY were deposited via liquid fuelled velocity oxy fuel (HVOF) thermal spray using two parameters tested as coatings. Effects of processing on microstructure mechanical properties the...
Abstract The bonding mechanisms of a wide range metallic materials in cold spraying have been studied, mainly attributed to adiabatic shear instability (ASI) at high strain rates, whereas the impact and deformation behavior entropy alloys (HEAs) onto various substrates has not widely explored. HEAs characterized by excellent strain-hardening ability resistance localization, which can influence their mechanism during spray. In this study, experimental numerical analyses single-particle...
Graphene has become a promising candidate to protect surfaces against friction due its strength and lubricating ability. In this study, graphene nano platelets (GNP) thin films have been deposited onto stainless steel substrates by axially injecting GNP suspension through high velocity oxy fuel thermal spray gun. The tribological performance of the under dry sliding wear was investigated unlubricated ball on disc test sintered alumina counter body 5 N load. understanding behaviour GNPs will...
A novel process, relatively fast and scalable compared to existing ones, has been used incorporate carbon nanotubes (CNT) 0.5 wt% onto commercial WC-Co thermal spray powder. Nano enabled WC-Co/CNT coatings were obtained by internal diameter HVOAF at three different powers (48, 41 34 kW). general increase in microhardness decrease fracture toughness found when adding CNT. Also, carbide retention index upon was improved lowering the process temperature CNT, reaching 99% low power case with The...
Gadolinium zirconate (GZ) is an attractive material for thermal barrier coatings (TBCs). However, a single layer GZ coating has poor cycling life compared to Yttria Stabilized Zirconia (YSZ). In this study, Solution Precursor High Velocity Oxy-Fuel (SP-HVOF) spray was used produce double GZ/YSZ TBC and the performance with YSZ TBC. The temperature behaviour of solution precursor studied, splat tests were carried out obtain optimised parameter. tests, single-layer reached 20 % failure at 85 ±...
Abstract The rapid development of cold spraying technology for additive manufacturing engineering components has made it a viable option developing thick deposits from high-entropy alloys (HEAs). microstructure cold-sprayed CoCrFeNiMn deposit was investigated in this study using electron backscattered diffraction, scanning microscopy, and finite element analysis (FEA). limited studies on the impact deformation behavior HEA during spraying, limiting our understanding phenomena, interactions...
The addition of graphene-based nanomaterials is known to improve the tribology properties materials by lowering coefficient friction and reducing wear. covering small areas with thin films routinely carried out; however, a fast efficient way large represents an outstanding challenge. Here we present method for deposition graphene nanoplatelets (GNPs) on stainless steel substrates based suspension high-velocity oxy fuel thermal spray. GNPs were radially injected into combustion jet, providing...
Yttrium aluminium garnet (YAG) is a promising topcoat material for thermal barrier coatings due to its high temperature stability and better CMAS (calcium-magnesium-alumino-silicate) resistance. YAG topcoats were deposited by suspension solution precursor high-velocity oxy-fuel (HVOF) spray. The relationships between processing, microstructure final properties studied through range of characterization techniques cycling tests. the as-sprayed from stoichiometric (SP-YAG) had distributed pores...
Magnesium nanoparticles (NPs) with initial size in the 10–50 nm range were synthesized by inert gas condensation under helium flow and deposited on room temperature substrates. The morphology crystal structure of NPs ensemble investigated as a function deposition time complementary electron microscopy techniques, including high resolution imaging chemical mapping. With increasing amount material, strong coarsening phenomena observed at temperature: small disappeared while large faceted...
Beam shaping - the ability to engineer phase and amplitude of massive massless particles has long interested scientists working on communication, imaging foundations quantum mechanics. In light optics, electromagnetic waves (photons) can be achieved using techniques that include, but are not limited to, direct manipulation beam source (as in X-ray Free Electron Lasers (XFELs) Synchrotrons), deformable mirrors, spatial modulators, mode converters holograms. The recent introduction holographic...