Băilă Diana-Irinel

• Universitatea Națională de Știință și Tehnologie Politehnica București

Stereolithography (SLA), Digital Light Processing (DLP), and Fused Deposition Modeling (FDM) technologies have evolved a lot in the last decade, making 3D printers more and more accurate, faster, and at more and more affordable prices. The precision of the parts obtained through these technologies has reached the order of microns, and the materials...

Purpose The development of new advanced materials, such as photopolymerizable resins for use in stereolithography (SLA) and Ti6Al4V manufacture via selective laser melting (SLM) processes, have gained significant attention in recent years. Their accuracy, multi-material capability and application in novel fields, such as implantology, biomedical, a...

Photovoltaic (PV) solar panels suffer from efficiency losses due to the accumulation of dust on their surface during operation, as well as the loss of transparency in the top glass. The efficiency can be increased when hydrophobic films are deposited on the top glass of the solar cells. The top glass of solar cells must have three characteristics:...

Advancements in materials science and 3D printing technologies have opened up new avenues for developing low-cost robotic grippers with high-performance capabilities, making them suitable for various biomechatronic applications. In this research, it has been explored the utilization of high-performance polymer materials, such as Polyetherketoneketo...

This article presents the process of development, testing, and use of wrist–hand orthosis in the hand therapy of a teen patient with congenital paresis disease. A regular 3D-printed anatomically adjusted orthosis is modified with a set of sensors, to work as motion and interaction controller in virtual reality (VR). As the patient with this conditi...

This paper presents the outcomes of investigations conducted on the development procedure of a personalized prosthetic device for an adult patient. The individualization is achieved through 3D scanning, followed by semi-automated design using the AutoMedPrint system, and low-cost fused deposition modelling (FDM) technology for 3D printing. The pros...

Featured Application The work presented in this paper will be applied in the process of design and the production of customized, low-cost upper limb prostheses, using the AutoMedPrint technology. The developed extended reality (XR) applications will be used for training and facilitating communication with customers. Abstract This paper presents re...

Although the volumes of fiber reinforced polymer composites (FRPs) used for aircraft applications is a relatively small percentage of total use, the materials often find their most sophisticated applications in this industry. In aerospace the performance criteria placed upon materials can be far greater than in other areas � key aspects are lightwe...

In the last years, composite materials are increasingly used in automotive, aeronautic, aerospace, construction applications. Composite materials have been used in aerospace in applications such as engine blades, brackets, interiors, nacelles, propellers/rotors, single aisle wings, wide body wings. The fields of use of composite materials have mult...

Stereolithography (SLA) is the oldest additive manufacturing technology, and it is a 3D printing technology used to create industrial concept models, rapid prototypes or different parts with complex geometries in a very short time. By SLA technology, it is possible to manufacture parts with extremely high feature resolutions and quality surface fin...

In engineering practice, perhaps the most interesting aspect of woodworking deals with the relationship between wood and moisture. The plywood composite presents hygroscopicity characteristic, as the wood and reaction almost like a sponge, will gain or lose moisture from the air based upon the conditions of the surrounding environment. When the tre...

In the last years, additive manufacturing technologies have been developed, especially direct metal laser sintering, and used in the dental and medical implant domains. Cardiovascular stents have evolved from bioinert, bare metal cages to biomimetic devices that promote tissue regeneration or healing. In this paper, comparisons concerning mechanica...

In the last decade, additive manufacturing technologies and especially direct metal laser sintering (DMLS) had become a great sustainability development method which can be widely used in the industry for testing custom-designed materials to create highly complex geometry parts that cannot be made by conventional methods. Dental restorations are fr...

Additive manufacturing (AM) methods are widely used in the industrial production, such processes being controlled by a computer, that permit to create three-dimensional object by depositing materials, usually in layers. The objective of this article was to realize sintered compacts of Co-Cr powder doped with ZrO2 and with HAp, necessary to improve...

Acid rain is a major problem for animals, plants, buildings, and also for the top glass of photovoltaic (PV) solar panels and greenhouses. Air pollutants such as NOx, NH3, and H2S can mix with water in the atmosphere to form acid rain. It was discovered that atmospheric water vapor adsorbed on the surface of glass can also lead to corrosion of the...

Mechanical behavior and characteristics of two different types of materials: cast iron with lamellar graphite EN-GJL-250 and cast iron with spheroidal graphite EN-GJS-400-15 which were cast in ceramic molds using gravitational casting method has considered in this research. The ceramic molds were obtained by 3D printing method. First, a finite elem...

In recent years in the dental field, new types of materials and techniques for the manufacturing of dental crowns and analog implants have been developed to improve the quality of these products. The objective of this article was to perform the surface characterization and determine the properties of Co-Cr alloy samples fabricated by the direct met...

Antireflection coatings have been widely used to increase the absorption of solar collectors and to reduce surface reflection. Many techniques have been explored to prepare thin coatings, such as sputtering, chemical etching, chemical vapour deposition, and sol-gel method. SiO 2 -ZnO coatings were prepared on the surface of glass substrates via the...

Many industrial processes, such as chemical process and pharmaceuticals, use aggressive acidic and caustic solution which may result in an early failure of the components of plant. The various corrosion processes in harsh environments could be uniform corrosion, localized corrosion, galvanic corrosion, etc. In order to extend the life of components...

Since their advent, various 3D printing technologies have been developed, out of which the Fused Filament Fabrication, FFF has completely revolutionized the industry in the last years. Classical FFF printers are using a thermoplastic filament, which is heated to its melting point and then extruded layer by layer to materialize a three dimensional p...

In the last decade, additive manufacturing has greatly developed and the manufacture of cheaper 3D hybrid (multitool) printers has increased. Hybrid 3D printers are equipped with interchangeable heads for manufacture and permit multiple types of processing such as 3D printing, CNC cutting, laser engraving or deposition of pasty materials. The objec...

The purpose of this article is to characterize surface of 304L stainless steel coating by e-gun technology with thin films of Ta2O5 and ZnO. ZnO films are used in pharmaceutical industries, in cosmetics and in medicine, grace of their better anticorrosive, antibacterial and photo catalytic properties. Ta 2 O 5 films have rapidly evolved in medicine...

The aeronautical industry is a sector constantly looking for new materials and equipment because of its tendency to expand quickly. The Ti6Al4V titanium alloy is used frequently in the aeronautic, aerospace, automobile, chemical and medical industry because it presents high strength combined with low density (approximately 4.5 g/cm 3), good creep r...

Direct Metal Laser Sintering process is modern technology and is used in different industries, inclusive in medicine industry. The purpose of this study was to obtain sintered compacts of Co-Cr powder doped with ZrO2 in order to improve the bioactivity of the implants and the behavior in vitro after immersion in simulated biological fluid (SBF) for...

In medicine, the surgical instruments are realized using a variety of stainless steel, such as curved elevators. The quality and the price of surgical instruments differ in function of the manufacturing processes and the material used. This paper, presents a prototype of elevator, manufactured using two types of additive manufacturing process Direc...

In this paper, two prototypes of dental elevator was made by DMLS process, using a super alloy powder of Co - Cr (ST2724G), with Phenix Systems machine, type PXS & PXM Dental, one with a threaded tail and another with a cylindrical tail. The quality obtained for the elevator is better, thanks to the material used and to the manufacturing process. F...

The purpose of this paper is to realize some researches concerning the powder Co-Cr, the sintering compacts obtain after Direct Metal Laser Sintering manufacturing and the corrosion resistance in artificial saliva. The Co-Cr alloys are used frequently in dentistry to realize personalized dental crown, bridges, chapels, dental implants or microsurge...

The medical industry has greatly benefited from the aid of various additive manufacturing (AM) technologies, especially for applications that include the fabrication of bespoke implants and guides, devices and surgical instruments. Manufacturing functional prototypes that can behave as close as possible to the final product is a key factor in devel...

The purpose of this study was to determine the bioactivity of Co-Cr disks manufacturing by Direct Metal Laser Sintering (DMLS) process. The Co-Cr samples realized by DMLS process were coated with hydroxyapatite (HA) obtained by sol-gel method to improve the bioactivity of the implants. The Co-Cr samples coated with hydroxyapatite were immersed in s...

The purpose of this study was to evaluate the chemical and metallurgical aspects, mechanical properties and hardness of the Co-Cr alloy powders manufactured by sintering process DMLS and compared with Ni-Cr alloys used for personalized dental crowns.In dentistry are develop new methods to obtain personalized dental crowns quickly, the cost is not e...

The purpose of this study was to obtain Co-Cr sintered compacts doped with hydroxyapatite (HA) in order to improve the bioactivity of implants and the in vitro behavior after an immersion in simulated biological fluid (SBF 1x) for 7 days. Co-Cr powder (ST2724G) was used to realize four compacts doped with 5wt% HA, 10wt% HA, 15wt% HA and 20wt%HA. Th...

The selective laser sintering is a technique used to quickly fabricate a scale model of a physical part or assembly using three-dimensional computer aided design CAD data. This technique is used to obtain complex pieces in different domains like machine building industry, automotive industry, foundry and medicine. The selective laser sintering proc...

In dental microsurgery, different dental instruments are used for teeth microsurgery and related diseases. The dental instruments materials are very different, e.g., plastics, stainless steel, titanium alloy, cobalt chrome alloys, diamond powders. The dental instruments materials must be nontoxic for the human body, with good corrosion resistance,...

The purpose of this study was to evaluate the chemical and metallurgical aspects, mechanical properties and hardness of the stainless steel of Fe-Cr alloy, the stainless steel of Fe-Cr alloys coating with Ni and Cu-Zn alloys coating with Ni alloys used for microsurgical instruments manufacturing.In dentistry are develop new materials and methods to...

The functionality of biomaterials must assure a good osteointegration of endobone implants used for the maxilo-facial implants. Materials must present a gradient for porosity and one for composition (presents of a bioactive phase in titan matrix). The exterior porosity, in the contact zones with the bone tissue, favors the incipient cellular proces...

The selective laser sintering process use the coposites powders titan-hydroxyapatite to realize prothesis in orthopedy, for hip, for knee or for shoulder. The bone structure have in common the principal protein component: the collagen and a little amount of organics phases and a inorganic component hydroxyapatite. The functionality of biomaterials...

The behaviour of metallic powders is very important for manufacturing parts and for realize the prototypes. Manufacturing of the orthopaedic implants by selective laser sintering process can be used in medicine. The powders necessary for SLS process are biomaterials who must assure a good osteointegration of endobone implants like the Ti powder (Ti...

Titanium alloy TA6V is chemically inert and which only reacts at high temperatures with various gas, can be used in medicine for medical implants through the process of selective laser sintering. It also shows a low toxicity to the human body and adheres well as implant in the human body. Therefore titanium alloy powder necessary for selective lase...

In the last years, the solid electrolyte fuel cells have been the subject of many researches, especially in order to remedy the problems relating to the environment. Although the solid electrolyte mostly used in industry, is the zirconium doped in yttrium, however a potential candidate can be the oxide of cerium non doped. Indeed this oxide present...

Biomaterials used to selective laser sintering process are made by powders of stainless steel, titanium powders and composite powders titan- hydroxyapathite. The titan alloy TA6V is used frequently in ortopaedic prothesis because presents a good resistance to corrosion due to the titanium oxide layer on the surface of the metal who prevents the ach...