A5028944442- Electrodeposition and Electroless Coatings
- Gas Dynamics and Kinetic Theory
- Rocket and propulsion systems research
- Aluminum Alloys Composites Properties
- High-Temperature Coating Behaviors
- Metal and Thin Film Mechanics
- Advanced ceramic materials synthesis
- Gas Sensing Nanomaterials and Sensors
- Thermal and Kinetic Analysis
- Advanced Chemical Sensor Technologies
- Material Properties and Applications
- Corrosion Behavior and Inhibition
- Advanced materials and composites
- High Temperature Alloys and Creep
- Additive Manufacturing and 3D Printing Technologies
- Electrocatalysts for Energy Conversion
- Thermochemical Biomass Conversion Processes
- Energetic Materials and Combustion
- Intermetallics and Advanced Alloy Properties
- Carbon Nanotubes in Composites
- Insect Pheromone Research and Control
- Adsorption and biosorption for pollutant removal
- Nanotechnology research and applications
- Zeolite Catalysis and Synthesis
- Catalysis and Hydrodesulfurization Studies
Sapienza University of Rome
2012-2024
National Interuniversity Consortium of Materials Science and Technology
2019-2024
This study aims to develop medium P (MP, 6 wt%) and high (HP, 11 Ni-P-ZrO2 nanocomposites on F22 steel substrate using an original lead-free surfactant-free solution quantitatively relate nanocomposite characteristics microhardness improvement corrosion resistance. Incorporation, dispersion distribution of the nanosized reinforcing phase were evaluated by coupling Scanning Electron Microscope (SEM) imaging acquisition with procedure for image processing analysis. X-ray Diffraction (XRD)...
Biochar has been used in various applications, e.g., as a soil conditioner and remediation of contaminated water, wastewater, gaseous emissions. In the latter application, biochar was shown to be suitable alternative activated carbon, providing high treatment efficiency. Since is by-product waste pyrolysis, its use allows for compliance with circular economics. Thus, this research aims obtain detailed characterization three carbonaceous materials: an carbon (CARBOSORB NC 1240®) two biochars...
Carbon-phenolic ablators can efficiently protect space vehicles from the extreme temperatures typical of reentry phase in a planet's atmosphere. Their performances are attributed to low thermal conductivity and decomposition phenolic resin. These phenomena strongly influenced by materials microstructure. In present work, standard polyvinylpyrrolidone (PVP)-modified carbon-phenolic were manufactured characterized: influence PVP on final microstructure chemistry was studied through SEM-EDS,...
Abstract In turbomachinery systems, combustion with excess air and the use of hydrocarbons result in generation a environment characterized by high concentration oxygen, nitrogen, CO2 H2O, along other compounds. The utilization syngas or molecular hydrogen as fuel source has been observed to an increase quantity water that interacts at elevated temperatures turbine materials. context transition low-emission energy sources, it is challenging predict long-term effects on component durability...
This study aims to develop Ni-P coatings with high P content (≥11 wt.%) reinforced WC nanoparticles on F22 steel substrates. The introduction of conductive in the plating solution dramatically increases reactivity solution, and consequently a tuning deposition parameters, terms temperature concentration, is required obtain nanocomposite improved mechanical properties. coatings’ porosity incorporation dispersion reinforcing phase as function concentration were analyzed by quantitative image...
The influence of two different fluoride-based activator salts (NH4F and AlF3) was studied for diffusion aluminide coatings obtained via pack cementation on a Ni-based superalloy (René 108DS). resistance to oxidation hot corrosion assessed as function the concentration used during synthesis process by means cementation. Two concentrations were selected (respecting equimolarity fluoride in synthesis) compared terms morphology, thickness composition, well microstructural evolution after high...
A new lead-free electroless Ni-P plating solution was developed for the deposition of coatings with medium phosphorus content (MP, 6–9 wt%), and its composition optimized to obtain deposits high (HP, 10–14 wt%). Cleaning activation treatments were studied in terms effectiveness influence on rate. The concentration reagents (nickel salt, complexing agent, reducing agent stabilizer) studied, their combined effect P rate investigated. obtained analyzed by SEM XRD thermally treated at 400 °C 600...
This work focuses on the possible application of gold nanoparticles flexible cotton fabric as acetone- and ethanol-sensitive substrates by means impedance measurements. Specifically, citrate- polyvinylpyrrolidone (PVP)-functionalized (Au NPs) were synthesized using green well-established procedures deposited fabric. A complete structural morphological characterization was conducted UV-VIS Fourier transform infrared (FT-IR) spectroscopy, atomic force microscopy (AFM), scanning electron (SEM)....
Abstract During the ballistic atmospheric re-entry, a space vehicle has to withstand huge thermo-mechanical solicitations because of its high velocity and friction with atmosphere. According kind re-entry mission, heat fluxes can be very (in order some MW m −2 ) ;thus, an adequate thermal protection system is mandatory in preserve structure vehicle, payload and, for manned crew. Carbon phenolic ablators have been chosen several missions they are able dissipate incident flux efficiently....
SiC/SiC ceramic matrix composites (SiCf/SiC CMCs) are regarded as the new materials for hot-section components of aircraft gas turbine engines, since they have one-third density metallic superalloys, a higher temperature capability, good mechanical strength, and excellent thermal shock resistance. However, high-temperature water-vapor-rich combustion gases can induce severe surface recession phenomena in leading to component failure. For this reason, it is necessary design protective...
Carbon nano/micro-structures used as fillers in metallic lightweight alloy matrix composites are receiving considerable attention scientific research and industrial applications. Aluminum magnesium the most studied light metals matrices metal materials, principally for their low density (respectively 2.7 g/cm3 1.7 g/cm3) melting temperature (around 660 °C both metals). A good interaction between is first step to obtain an increase bulk properties; furthermore, manufacturing procedure of...
Abstract Ablative materials represent a widespread solution for shielding space vehicles from overheating during reentry phase in atmosphere where the high heating fluxes and consequent temperatures cannot be compatible with vehicle structure safety of payload and/or crew. In this work, two different kinds carbon-phenolic ablators density 0.3 g/cm 3 were manufactured their mechanical thermal properties experimentally evaluated. The protection performances developed assessed hypersonic plasma...
Abstract Carbon‐phenolic ablators are very efficient heat shields for atmospheric reentry vehicles: they able to protect a capsule from hyper thermal environments characterized by intense fluxes (>1 MW/m 2 ) and high temperature (also exceeding 300°C). Ablative materials can be modified the addition of nano‐fillers in order improve their performance: small amounts (in 2–5 wt%) enhance matrix material properties, guarantying weight saving too. In this work, three different kinds ceramic...
The issues in dispersing any form of carbon metal matrix is the major problem field composites with reinforcement (MMCcr). low wettability molten metals and difference density are some difficulties to obtain a good dispersion fibers and, as consequence, an improvement critical properties for wide range application (mechanical properties, electrical optical properties). For this reason, aim work metallic coated fiber enhance interaction between matrix. Moreover, also could be adjusted...
Aluminum is a very useful structural metal employed in different industrial sectors, particular it used large quantities automotive, aeronautic and nautical industries. The main reasons of its wide use are: good oxidation resistance, excellent ductility, low melting temperature (660 °C) density (2.71 g/cm3). However, order to reduce the emissions fuel consumption necessary overall weight vehicles by increasing mechanical properties material. improvement normally achieved through...