Monica Ferraris

Monica Ferraris
Polytechnic University of Turin | polito · DISAT - Department of Applied Science and Technology

MSc

About

314
Publications
38,231
Reads
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7,684
Citations
Additional affiliations
January 1991 - present
Polytechnic University of Turin
Position
  • Professor (Full)
Description
  • Materials Science and Technology
January 1990 - December 1991
Centro Ricerche FIAT
Position
  • Researcher
Description
  • Composites for automotive applications; scanning electron microscopy
October 1985 - December 1990
Centro Studi E Laboratori Telecom -CSELT, Torino, Italy
Position
  • Researcher
Description
  • synthesis of fluoride glasses for low loss optical fibers

Publications

Publications (314)
Article
Full-text available
This study evaluates the effectiveness of a silica preceramic polymer for joining and coating Plasma Electrolytic Oxidated (PEO) aluminum components at temperatures below 200 °C. PEO aluminum slabs were coated and joined with a silica precursor polymer (Durazane1800, Merck, Darmstadt, Germany), both with and without the addition of 48 wt% silica na...
Article
Full-text available
This study investigates the impact of exposure to aggressive environments, specifically saline conditions per ASTM B117 standard, on the shear strength of adhesive‐bonded joints, crucial for ensuring structural integrity in various industrial applications like automotive, aerospace, and construction. Using an epoxy‐based adhesive to bond AISI304 st...
Article
Today, aramid fibers are well known as a high‐performance and ideal material for reinforcement purposes in rubber product manufacturing including hoses, tires, cables, and conveyors composites. However, surface modification of aramid fiber is necessary to solve poor interfacial adhesion between aramid fibers and the rubber matrix. Accordingly, in t...
Article
Full-text available
Several techniques have been developed to confer antibacterial properties to cotton textiles using silver nanoparticles. However, the antimicrobial performance of such a modified fabric can drastically decrease after a washing treatment. The aim of this work has been to develop antibacterial composite coatings with improved water resistance, deposi...
Article
High photocatalytic activity layers were obtained by combining a TiO2 nanostructured coating support with 10 nm and 20 nm NiO layers synthesized by direct current (DC) magnetron sputtering. In order to improve the TiO2 crystallinity several sputtering process parameters were studied. The TiO2 and NiO/TiO2 coatings were characterized through XPS, XR...
Article
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This work reports about preparation of W/Fe co-sputtered layers between tungsten and steel in order to ease their coefficient of thermal expansion mismatch.Iron and tungsten have been gradually co-sputtered on W tiles with real time deposition parameters changing to obtain a graded interlayer: SEM, EDS, XPS, HR-TEM have been used to characterize th...
Article
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New antiviral drugs and new preventive antiviral strategies are a target of intense scientific interest. Thanks to their peculiar properties, nanomaterials play an important role in this field, and, in particular, among metallic materials, silver nanoparticles were demonstrated to be effective against a wide range of viruses, in addition to having...
Article
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Glass-to-metal interfaces play a crucial role in the robustness and the mechanical integrity of solid oxide cells, and it is well known that a sound interface improves the mechanical reliability of the whole stack. The present work focuses on the torsional behaviour of hourglass-shaped Crofer 22 APU stainless steel joined by a glass sealant specifi...
Article
The analysis of the radiation damage associated with energetic neutrons is a key factor for the application of glass-ceramics as joining materials in nuclear fusion plants. Triple ion beam irradiation is, currently, the only way to emulate the displacement damage and the effects of transmutation products induced by high energy neutrons at elevated...
Article
The robustness of the sealings used for the solid oxide cell (SOC) stack technology is crucial to prevent gases from mixing and failure. With a desire to increase the internal operating pressure the mechanical performance requirement of sealings increases. The mechanical behaviour of a glass-ceramic joined steel (Crofer 22 APU) and glass-ceramic in...
Article
Ox/ox CMC based on Nextel 610™ fibers with 75 wt% alumina – 25 wt% zirconia matrix have been joined by a glass-ceramic and tested in creep in four-point bending (DIN EN 820–4) up to 50 h at 850 °C and 1000 °C, between 32 and 41 MPa. As a comparison, the creep limit of the non-joined ox/ox CMC was investigated in this range and also at higher temper...
Article
Full-text available
Nowadays adhesive joints are more and more used; therefore, a precise and reliable shear strength measurement of these joints is necessary to design and predict a final components’ performance. This work aimed to assess the shear strength value of adhesively joined ceramics (SiC, Si3N4) and steel in the case of an elasto-plastic (ductile) joining m...
Article
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In this study, authors explore the application of modelling and Additive Layer Manufacturing (ALM) for creating and testing materials with interlocking structures aimed to reduce the stress concentration along the edges of a typical lap joint. The effectiveness of this approach is discussed by means of modelling and experimental validation of joint...
Article
Full-text available
The integration of oxygen transport membranes in industrial processes can lead to energy and economic advantages, but proof of concept membrane modules are highly necessary to demonstrate the feasibility of this technology. In this work, we describe the development of a lab-scale module through a comprehensive study that takes into consideration al...
Article
Aluminum alloys are well known light-weight alloys and very interesting materials to optimize the strength/weight ratio in order to reduce automotive vehicle weight, fuel consumption and CO2 emissions; unfortunately, they are also relatively soft and therefore cannot be used for high wear applications. The aim of this work was to develop an aluminu...
Article
Full-text available
A summary and update of the research on the design, process, and testing of glass and glass‐ceramic to metal seals for solid oxide cells (SOC) conducted during the last 13 years at the Politecnico di Torino, Italy, within our research group and with several international collaborations, is presented and discussed. Glass and glass‐ceramic‐based mate...
Chapter
The invention of bioactive glasses has undoubtedly represented an important watershed in the history of biomedicine, innovatively revolutionizing the key concept of biomaterials. Although 50 years have passed since the first bioactive glass (45S5 Bioglass®), these materials still continue to inspire numerous generations of researchers all over the...
Chapter
Following the general increase of population and industrial development, the management of resources through use of secondary source of raw materials, recycling and energy recovery from waste products are growing in importance. There are many challenges associated with each approach in which waste treatment and handling its by-products are among th...
Article
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Concentrated solar power (CSP) is an important option as a competitive, secure, and sustainable energy system. At the moment, cost-effective solutions are required for a wider-scale deployment of the CSP technology: in particular, the industrial exploitation of CSP has been so far hindered by limitations in the materials used for the central receiv...
Article
Full-text available
In this study, multifunctional stratified antibacterial and bioactive coatings were deposited and characterised. Initially, PEEK/bioactive glass (BG)/ mesoporous bioactive glass nanoparticle (MBGN) layers with a thickness of 110–120 μm were deposited on stainless steel substrates using electrophoretic deposition (EPD). Thin silver nanocluster-silic...
Article
This work addresses the integration of ceramic matrix composites (CMCs) and an Al alloy to obtain mechanically reliable and in-service durable CMC-Al alloy joints for high-performance road brake discs. Such a braking system is based on the use of CMC discs mounted onto a hub or stub axle by means of a mounting bell, manufactured in aluminium alloy....
Article
The widespread of viral airborne diseases is becoming a critical problem for human health and safety, not only for the common cold and flu, but also considering more serious infection as the current pandemic COVID-19. Even if the current heating, ventilating and air conditioning (HVAC) systems limit the disease transmission by air, the air filters...
Article
Incineration is the most common way to reduce the mass and the volume of municipal solid wastes. One of the most dangerous by-products of the incineration process is fly ash that contains a considerable amount of heavy metals. Therefore, its treatment is crucial to prevent the leaching of heavy metals into the environment. In the present work, two...
Article
A high performance adhesive is used to join Zerodur to a carbon fiber reinforced polymers (CFRPs) honeycomb (HC) in a sandwich structure for aerospace applications. The main problem of finding an adhesive with suitable thermomechanical stability and ease of application for use in large components, together with a lower curing temperature than 160 °...
Article
The aim of this work is to develop high‐performance adhesives to join carbon fiber reinforced composites (C/C) for use in aerospace applications; in order to guarantee sound mechanical strength, a low coefficient of thermal expansion, and ease of application on large components. Several different adhesive formulations, based on phenolic or cyanate‐...
Article
Full-text available
During the current pandemic of COVID-19 caused by the new Coronavirus SARS-CoV-2, the confinement measures slowed down the contagion, but did not completely avoid the disease diffusion for health workers, patients and the remaining population. The individual protection equipment (e.g. facial masks), filters for air conditioning systems and for medi...
Article
The Micro-Electrical Discharge Machining (Micro-EDM) technique has been employed to machine micro-patterns with shaped micro-slots on Ti6Al4V surfaces. Ti6Al4V substrates, with and without micro-slots, were bonded using a commercial epoxy adhesive. Optical microscopy and SEM were used to observe the micro-patterned Ti6Al4V surfaces before and after...
Article
Since reliable long term operation of SOFC and SOEC devices depends critically on the mechanical behavior of the sealant material, the current work focuses on the characterization of the shear strength by a torsion test of two different glass-ceramic sealants that are used to join Crofer22APU substrates in an application relevant configuration. The...
Article
Indoor air quality has great impact on health and wellbeing of the occupants. Although modern air filtration systems assure high air quality, however the filtration media itself needs to be protected from microbial contamination. Low maintenance and dirt accumulation along with humid conditions in air ventilation systems create a suitable environme...
Article
The design of interfaces, coupled with suitable joining materials and joining technologies, is a key parameter in component manufacturing and surface pre-treatments are crucial steps for the production of robust and reliable bonds. In this work, plasma pre-treatments on SiC and Si3N4 are studied and discussed. The pre-treated joined samples have sh...
Article
Full-text available
Nowadays glass is widely used in building applications and coupled to steel through adhesive joining. Reliable mechanical characterization of these joints is necessary to design and predict the final structure performance. In this framework, the aim of this paper is to measure the pure shear strength and elastic modulus for design and modelling of...
Article
Full-text available
A revision and update about the research activity done in the past 25 years at Politecnico di Torino (Italy) on design and testing of glasses and glass‐ceramics for the joining of Ceramic Matrix Composites (CMCs) will be presented and discussed. The “glass‐ceramic method” to obtain a thermo‐mechanically stable joint starting from a glass will be de...
Article
Full-text available
The aim of this work was to discuss the suitability of the joining process called “RM‐Wrap” (RM = Refractory Metals, ie, Mo, Nb, Ta, Zr) as a pressure‐less and tailorable technique to join several different ceramics such as SiC, alumina, and mullite (3Al2O3.2SiO2). In the RM‐Wrap joining technique the refractory metal foil is used as a wrap contain...
Article
An original method to increase the mechanical strength of adhesively joined carbon fiber-reinforced plastics (CFRPs) and honeycomb CFRP sandwich structures by etching is proposed, based on sulfuric acid etching of the CFRP surface. Etched composites are joined by a novel phenolic resin-based adhesive and are cured, and their cross section is observ...
Article
Full-text available
This work aims to evaluate the potential suitability of nonvitrified and vitrified bottom ashes to serve as substitute materials for both OPC and sand in mortars on an industrial scale. Three bottom ashes were selected as OPC substitutes: one was vitrified inside the incinerator plant (W1‐C), one was carbonated under ambient conditions for 3 months...
Article
Full-text available
This study aims at deposition and characterization of antibacterial, hydrophobic and semitransparent metal/plasma polymer nanocomposite coating, containing Ag nanoparticles, onto cotton fabrics intended to be used in medical applications. The nano composite coatings were obtained via a simple, one step and ecofriendly plasma based co-deposition app...
Article
Bacterial contamination and bone tissue overgrowth are currently the main issues for temporary fixation devices. The aim of this research is the development of innovative inorganic coatings able to reduce bacterial adhesion and bone tissue overgrowth without hampering cytocompatibility. 316L stainless-steel, Titanium grade4 and Titanium grade5 were...
Article
This work has focused on surface engineering coupled with brazing to join SiCf/SiC composites and to improve the joint strength. The surface engineering was carried out through the Selective Thermal Removal (STR) of SiC fibres from a SiCf/SiC composite to obtain “brush-like” surfaces; the modified composites were then joined by means of an AgCuTi b...
Article
Full-text available
Rice husk, an agricultural waste, is abundantly available in many countries such as China, India, Brazil, US, and South East Asia. Despite the massive production of rice husk, it is mainly disposed to landfill. In this work, utilization of rice husk for a potential waste‐water treatment is evaluated, along with subsequent encapsulation of the adsor...
Article
Excellent mechanical, thermal and chemical properties make Vectran™ fibres an attractive material to be used in high end applications. Its aerospace applications, as in inflatable light weight habitat module, require functional coating to provide antibacterial protection to ensure safe environment for the astronauts. In this study, woven Vectran™ f...
Article
Efficient joining materials and techniques are of critical importance for the integration of CMCs in high performance structures. Continuous oxide fiber Nextel ™ 610/alumina-zirconia composites were successfully joined to themselves by using a novel glass-ceramic based on the SiO 2 -CaO-Al 2 O 3 -MgO-Y 2 O 3 -ZrO 2 system.Crystallization kinetic of...
Article
The RM-wrap (RM = Refractory Metal) is a pressure-less, versatile and tailorable joining process: it consists of wrapping Si foils inside a refractory metal wrap (i.e., Mo, Nb, Ta) in order to prevent molten silicon from leaking outside the joined region and infiltrating the facing materials during the joining process. RM-wrap (RM = Mo, Nb, Ta) has...
Article
Recycling is a key environmental issue due to the decrease in global natural resources and constant increase of solid wastes. In this context, we used vitrified bottom ashes from municipal solid waste incinerators as a starting material to produce porous ceramics by employing inorganic salts as foaming agents. These ceramic foams, consolidated thro...
Article
Full-text available
Alumina dispersion-strengthened copper, Glidcop, is used widely in high-heat-load ultra-high-vacuum components for synchrotron light sources (absorbers), accelerator components (beam intercepting devices), and in nuclear power plants. Glidcop has similar thermal and electrical properties to oxygen free electrical (OFE) copper, but has superior mech...
Article
The thermosets are non-repairable and non-recyclable and non-repairable polymers. However, the introduction of reversible/dynamic chemical bonds into polymer networks has overcome such limitations of the thermoset composites. In this study, utilizing the dynamic polymer systems, a new approach to enhance the impact resistance of thermoset composite...
Article
Full-text available
Aluminium alloy foam is a lightweight material with high energy absorption properties and can potentially replace bulk Al-components. The aim of this work is to develop a brazing technique to join aluminium facing sheets to aluminium alloy foam to obtain aluminium foam sandwich panels for applications where high service temperature is a requirement...
Preprint
Full-text available
Alumina dispersion-strengthened copper, Glidcop, is used widely in high-heat-load ultra-high-vacuum components for synchrotron light sources (absorbers), accelerator components (beam intercepting devices) and in nuclear power plants. Glidcop has similar thermal and electrical properties to OFE (oxygen free electrical) copper, but has superior mecha...
Conference Paper
Full-text available
Lean duplex stainless steels have similar corrosion and better mechanical properties than the austenitic grades, which ensure their extensive spreading in industrial applications as a substitute of austenitic grades. In the construction of liquid tanks, however, it is often necessary to weld such steels with a range of fittings which are commonly f...
Article
Silicon carbide (SiC) fiber reinforced SiC matrix composites continue to undergo development for fusion applications worldwide because of inherent advantages of the material including low activation, high temperature capability, relatively low neutron absorption, and radiation resistance. This paper presents an international overview of recent achi...
Presentation
Full-text available
Hourglass specimen design for torsion testing at ORNL and Politechnico di Torino (M. Ferraris) and HFIR irradiation testing at ORNL. Hourglass shape designed to ensure pure torsion stress state and fracture within joint region. Testing on unirradiated specimens made at PNNL indicate joints are too strong for this specimen design as all failures occ...
Article
The joining of hypereutectic Al-Si alloy heat pipes to CRFP skins has been studied for radiator panel applications. Three different epoxy adhesives (two thermal conductive adhesives and one high-strength structural one) were used and mechanically characterised before and after thermal cycling. Two adhesives gave the most promising results, in terms...
Article
The aim of this work was to investigate and discuss the microstructure and interface reaction of a calcia-alumina based glass-ceramic (CA) with SiC. CA has been used for several years as a glass-ceramic for pressure-less joining of SiC based components. In the present work, the crystalline phases in the CA glass-ceramic and at the CA/SiC interface...
Article
SiC foams sandwiched between two Ceramic Matrix Composite (CMC) skins are of interest for several high temperature applications ranging from aeronautics to energy production. In this paper, SiC foams were joined to C/SiC composites by the “Mo-wrap” method to obtain sandwich structures. The Mo-wrap method is a recently developed joining technique: i...
Article
Chromium carbide modified C/C and Ti6Al4V were successfully joined using a TiCuZrNi brazing alloy in powder form. The braze/composite interface and the mechanical strength of C/C-Ti6Al4V joints were evaluated. The apparent shear strength of chromium carbide modified C/C joined to Ti6Al4V, measured by single lap test in compression, was 52±6 MPa, wh...
Article
Alumina (Nextel™ 610) fibre reinforced YAG-ZrO2 matrix composites were successfully joined by using different brazing alloys, metallic interlayers and a glass-ceramic. All joints were mechanically stable and free of cracks. Three commercial brazing alloys and a new alloy based on Ti/Cu/Al interlayers were selected to join these composites for appli...
Article
In order to improve the mechanical strength of sealants for solid oxide fuel cell (SOFC) stacks, several fillers were proposed in this work as reinforcement for a glass-ceramic sealant based on the system BaO-CaO-SiO2. The chosen reinforcement additives were metallic particles including nickel, a nickel-chromium alloy and silver, as well as ceramic...
Article
Bioactive and antibacterial coatings on stainless steel substrates were developed and characterized in this study. Silver nanocluster-silica composite coatings of 60-150 nm thickness were deposited using radio frequency (RF) co-sputtering on PEEK/bioactive glass (BG) layers (of 80-90 µm thickness) which had been electrophoretically deposited onto s...
Article
Full-text available
Flash joining of CVD-SiC coated C f /SiC samples with a Ti interlayer was achieved using a Spark Plasma Sintering machine. The influence of different heating powers and discharge times were investigated. The sample flash joined at a maximum heating power of 2.2 kW (peak electric current of 370 A) within 7 s showed the highest apparent shear strengt...
Article
Full-text available
Antibacterial functionality of cellulosic fibers has become an integral requirement for various applications. Silver is widely studied to functionalize textiles with antimicrobial properties and it can be applied via different routes, classified in wet and dry processes. Wet treatments can potentially influence the bulk properties of the textiles n...
Article
Surface engineering based on the Selective Thermal Removal (STR) of SiC fibers from SiCf/SiC composites was used to obtain a brush-like surface in view of joining processes. As observed through 3D confocal microscopy, the thermal treatment led to a selective removal of the surface fibers so that the specific surface increased. Wetting tests were pe...
Article
Learning from Nature is a humble and smart approach to fabricate implantable biomaterials with complex hierarchies and porous microstructures which can effectively mimic the natural tissues that they have to replace and regenerate. Biological structures such as corals, marine sponges, wood, and vegetal products can be used as sacrificial templates...
Article
With the goal of preventing abdominal infections after implanting prostheses for hernia repair, polypropylene prostheses were coated with a silver nanoclusters-silica composite (Ag/SiO2) layer, by means of a sputtering process, to confer antibacterial properties. The Ag/SiO2 coating was deposited, with good uniformity and adhesion, either onto hern...
Article
This study focuses on the design, characterization and testing of a new glass-ceramic sealant for Na-based batteries. The thermo-mechanical properties as well as the sintering behaviour of the new sealant have been characterized by thermal analyses and x-rays diffraction studies. The exothermic peak in the differential thermal analysis plots has be...
Chapter
Full-text available
This work developed a continuum damage mechanics model that incorporates thermal expansion combined with irradiation-induced swelling effects to study the origin of cracking observed in recent irradiation experiments. Micromechanical modeling using an Eshelby-Mori-Tanaka approach was used to compute the thermoelastic properties of the Ti3SiC2/SiC j...
Article
A MoSi2/Si composite obtained in situ by reaction of silicon and molybdenum at 1450°C in Ar flow is proposed as pressure-less joining material for C/SiC and SiC/SiC composites. A new “Mo-wrap” technique was developed to form the joining material and to control silicon infiltration in porous composites. MoSi2/Si composite joining material infiltrati...
Article
A coating made of silver nanocluster/silica composites has been deposited, via a radio frequency (RF) co-sputtering technique, for the first time onto stainless steel (AISI 304L) with the aim to improve its antibacterial properties. Different thermal treatments after coating deposition have been applied in order to optimize the coating adhesion, co...
Article
Bacterial issues in ophthalmic applications, with particular reference to postoperative infection of ocular implants, cause significant problems that often require additional, stressful and expensive treatments for the patients. In this work we applied silver-containing antibacterial costings on two kinds of polymeric ocular devices, i.e. silicone...
Conference Paper
The fission-fusion hybrid reactor (FFHR) constitutes a challenging playground for nuclear engineers. The CIRTEN consortium is responsible today for essentially all of the nuclear engineering research and education efforts in the Italian academia, with a spread of competences going from ITER, DEMO and, more generally, different fusion engineering ap...