C. Bartùli

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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Slurry Aluminizing of Nickel Electroless Coated Nickel-Based Superalloy

Thomas Kepa, Gilles Bonnet, Giulia Pedrizzetti, Virgilio Genova et autres

Nickel-based superalloys require protective low-activity aluminide coatings to withstand high-temperature oxidation and corrosion in turbine applications. As opposed to conventional gas processes, this study investigates the mechanisms of formation of alternative low-activity nickel aluminide coatings on the René N5 superalloy through electroless …

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Slurry Aluminizing Mechanisms of Nickel-Based Superalloy and Applicability for the Manufacturing of Platinum-Modified Aluminide Coatings

Giulia Pedrizzetti, Virgilio Genova, Erica Scrinzi, Rita Bottacchiari et autres

The slurry aluminizing process is widely employed to enhance the oxidation and corrosion resistance of nickel-based superalloys used in high-temperature environments such as gas turbines and aerospace engines. This study investigates the effects of the concentration of Al vapors in the reactor …

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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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Effect of ceramic nano‐particles on the properties of a carbon‐phenolic ablator

Laura Paglia, Caterina Mapelli, Virgilio Genova, Maria Paola Bracciale et autres

Abstract Carbon‐phenolic ablators are very efficient heat shields for atmospheric reentry vehicles: they are able to protect a capsule from hyper thermal environments characterized by intense heat fluxes (>1 MW/m2) and very high temperature (also exceeding 300°C). Ablative materials can be modified …

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Diffusion aluminide coating modified via electroless nickel plating for Ni-based superalloy protection

Virgilio Genova, Giulia Pedrizzetti, Laura Paglia, Francesco Marra et autres

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Design of New Carbon-Phenolic Ablators: Manufacturing, Plasma Wind Tunnel Tests and Finite Element Model Rebuilding

Laura Paglia, Virgilio Genova, Jacopo Tirillò, C. Bartùli et autres

Abstract Ablative materials represent a widespread solution for shielding space vehicles from overheating during a reentry phase in atmosphere where the high heating fluxes and the consequent high temperatures cannot be compatible with the vehicle structure and with the safety of the …

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Diffusion Aluminide Coatings for Hot Corrosion and Oxidation Protection of Nickel-Based Superalloys: Effect of Fluoride-Based Activator Salts

Virgilio Genova, Laura Paglia, Giovanni Pulci, C. Bartùli et autres

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). The resistance to oxidation and hot corrosion was assessed as a function of the concentration …

Thermochemical characterization of polybenzimidazole with and without nano-ZrO2 for ablative materials application

Laura Paglia, Virgilio Genova, Maria Paola Bracciale, C. Bartùli et autres

Abstract During the ballistic atmospheric re-entry, a space vehicle has to withstand huge thermo-mechanical solicitations because of its high velocity and the friction with the atmosphere. According to the kind of the re-entry mission, the heat fluxes can be very high (in …

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Manufacturing, thermochemical characterization and ablative performance evaluation of carbon-phenolic ablative material with nano-Al2O3 addition

Laura Paglia, Virgilio Genova, Francesco Marra, Maria Paola Bracciale et autres

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Amorphous Steel Coatings Deposited by Cold-Gas Spraying

Mario Tului, C. Bartùli, Alessia Bezzon, Angelo Luigi Marino et autres

Cold-gas spray (CGS) deposition of amorphous steel coatings starting from a commercial feedstock powder containing boron, tungsten, and silicon was investigated. Microstructural characterization, carried out by X-ray diffraction (XRD), transmission electron microscopy, and backscattered electron diffraction (EBSD) analysis, confirmed the amorphous nature …

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Hot Corrosion Resistance of Laser-Sealed Thermal-Sprayed Cermet Coatings

Lidia Baiamonte, C. Bartùli, Francesco Marra, Annamaria Gisario et autres

Hot corrosion affects the components of diesel engines and gas turbines working at high temperatures, in the presence of low-melting salts and oxides, such as sodium sulfate and vanadium oxide. Thermal-sprayed coatings of nickel–chromium-based alloys reinforced with ceramic phases, can improve the …

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