Francesco Marra

High-power Powder Bed Fusion–Laser Based of Dragon Copper: Microstructure, mechanical properties, and application to next-generation gravitational wave detectors

Francesco Filoscia, Valerio Pettinacci, Marco Ricci, Giulia Pedrizzetti et autres

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Enhancing copper processability via carbon nanotubes reinforcement in Powder Bed Fusion - Laser Based: Dragon Copper

V. Pettinacci, Francesco Filoscia, Ravi Prakash Yadav, Daniele Cortis et autres

Powder Bed Fusion - Laser Based (PBF-LB) is a widely used additive manufacturing technology for metallic materials, but its application to pure copper remains challenging due to its high reflectivity in the near-infrared (NIR) wavelength range, commonly employed in commercial laser systems. …

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Scandium and Yttrium/Ytterbium Disilicates as Environmental Barrier Coatings: Microstructural Characterization and High-Temperature Water Vapor Exposure Tests

Laura Paglia, Giulia Pedrizzetti, Rita Bottacchiari, C. Bartùli et autres

Abstract Ceramic matrix composites (CMCs), particularly SiC/SiC, exhibit outstanding properties making them ideal for applications in the hot sections of aircraft engines. However, they require protection against high-temperature water vapor corrosion: To address this challenge, environmental barrier coatings (EBCs) are currently one …

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Deposition of high-velocity oxygen-fuel (HVOF) coatings on laser-powder bed fused (L-PBF) parts subjected to in-situ laser remelting treatments

Maria Francesca Bonilauri, Matteo Perini, Sasan Amirabdollahian, Laura Paglia et autres

In this work, we focused on enhancing the adhesion between High Velocity Oxygen-Fuel (HVOF) sprayed coatings and Laser-Powder Bed Fused (L-PBF) substrates by modifying the substrate surface through in-situ laser remelting treatments. Additionally, we investigated whether deposition on laser-treated substrates affected the …

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High-temperature Corrosion and Oxidation Behavior of Nickel/Cobalt-based Superalloys Operating with Hydrogen Mixtures

Francesco Marra, Giovanni Pulci, Laura Paglia, M. Tonti et autres

Abstract In turbomachinery systems, combustion with excess air and the use of hydrocarbons result in the generation of a combustion environment characterized by a high concentration of oxygen, nitrogen, CO2 and H2O, along with other combustion compounds. The utilization of syngas or …

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Influence of microstructural parameters on thermal cycling behavior of DVC-TBC systems

Giulia Pedrizzetti, Erica Scrinzi, Elvira Giubbolini, Rita Bottacchiari et autres

This study presents a novel approach to characterizing crack distribution and bond coat roughness in Thermal Barrier Coatings (TBCs) with dense vertically cracked (DVC) top coats and MCrAlY bond coats, aiming to correlate microstructural features with durability and failure mechanisms. A MATLAB®-based …

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Carbon-Phenolic Ablators Modified by Ceramic Nanofilms Deposited via Atomic Layer Deposition (ALD) Technique

Rita Bottacchiari, Laura Borgese, Laura Paglia, Giulia Pedrizzetti et autres

Ablative materials are widely employed to protect space vehicles from the extreme thermal conditions experienced during their flight into a planetary atmosphere. Carbon-phenolic ablators are composed of a phenolic matrix and a fibrous carbon reinforcement. In the present study, the fibrous reinforcement …

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Effect of Dehydrogenation and Heat Treatments on the Microstructure and Tribological Behavior of Electroless Ni-P Nanocomposite Coatings

Giulia Pedrizzetti, Enrico Baroni, Michele Gragnanini, Rita Bottacchiari et autres

High phosphorus Ni-P coatings, both unreinforced and modified by the addition of alumina (Al2O3) and zirconia (ZrO2) nanoparticles, were manufactured by electroless deposition technique and heat-treated with different temperature and duration schedules. The effect of dehydrogenation (200 °C for 2 h) and …

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Influence of Deposition Temperature and WC Concentration on the Microstructure of Electroless Ni-P-WC Nanocomposite Coatings with Improved Hardness and Corrosion Resistance

Giulia Pedrizzetti, Virgilio Genova, Michelangelo Bellacci, Erica Scrinzi et autres

This study aims to develop Ni-P coatings with high P content (≥11 wt.%) reinforced with WC nanoparticles on F22 steel substrates. The introduction of conductive WC in the plating solution dramatically increases reactivity of the plating solution, and consequently a tuning of …

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Micro and nanostructured carbon-phenolic ablators modified by PVP addition

Laura Paglia, Rita Bottacchiari, Flavio Cognigni, Sara Cerra et autres

Carbon-phenolic ablators can efficiently protect space vehicles from the extreme temperatures typical of the reentry phase in a planet’s atmosphere. Their performances are attributed to the low thermal conductivity and to the decomposition of the phenolic resin. These phenomena are strongly influenced …

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Ytterbium Disilicate/Monosilicate Multilayer Environmental Barrier Coatings: Influence of Atmospheric Plasma Spray Parameters on Composition and Microstructure

Giulia Di Iorio, Laura Paglia, Giulia Pedrizzetti, Virgilio Genova et autres

SiC/SiC ceramic matrix composites (SiCf/SiC CMCs) are regarded as the new materials for the hot-section components of aircraft gas turbine engines, since they have one-third of the density of metallic superalloys, a higher temperature capability, good mechanical strength, and excellent thermal shock …

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Microstructural, mechanical and corrosion characterization of electroless Ni-P composite coatings modified with ZrO2 reinforcing nanoparticles

Giulia Pedrizzetti, Laura Paglia, Virgilio Genova, Serena Cinotti et autres

This study aims to develop medium P (MP, 6 wt%) and high P (HP, 11 wt%) Ni-P-ZrO2 nanocomposites on F22 steel substrate using an original lead-free and surfactant-free solution and to quantitatively relate nanocomposite characteristics to microhardness improvement and corrosion resistance. Incorporation, …

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