33 documents found, page 1 of 4
Ti6Al4V-Ag active antibacterial surfaces by laser powder bed fusion for biomedi...
Rodrigues, Flávio Gabriel Silva; Faria, Ana; Bartolomeu, Flávio; Silva, Filipe Samuel; Madeira, SaraBacterial infections pose significant challenges in biomedical applications, often leading to severe complications. The traditional reliance on antibiotics to manage these infections is rapidly increasingly the antibiotic-resistant bacteria problem. This resistance makes many conventional treatments less effective, encouraging the interest of new approaches that do not rely on antibiotics. Consequently, the dev...
3D Multi-Material Laser Powder Bed Fusion of 420 stainless steel-Cu parts for P...
Cunha, Ângela Sofia Varela; Marques, Ana Cristina Ribeiro; Silva, Filipe Samuel; Carvalho, Óscar Samuel Novais; Bartolomeu, Flávio; Gasik, MichaelPlastic injection molding is one of the fastest-growing industries in the world. However, although it presents numerous advantages, the costs associated with the mold and machine are high and, therefore, this process is only profitable for mass production. Moreover, the reduction in the cycle time, more specifically the cooling time, has been a never-ending challenge since it has a direct influence on productio...
Innovative piezoelectric composite material for Footwear Soles with antibacteri...
Rodrigues, Flávio Gabriel Silva; Silva, Filipe Samuel; Bartolomeu, Flávio; Madeira, Sara Cristina Soares; Pinto, João Pedro Figueiredo[Excerpt] Bacteria possess remarkable adaptability, and their escalating resistance to antibiotics poses a formidable challenge to public health. Thus, the exploration of alternative strategies becomes essential in addressing surface contamination by bacteria. To develop effective preventive measures, it is crucial to comprehend the mechanisms underlying bacterial adhesion and biofilm formation[1,2]. Although a...
Inconel 718–Copper bimetallic joints fabricated by 3D multi-material laser powd...
Marques, Ana Cristina Ribeiro; Carvalho, Óscar Samuel Novais; Silva, Filipe Samuel; Bartolomeu, Flávio; Pereira, Sónia; Alexandrino, PauloUsually, aerospace components are subjected to high demanding operating conditions in terms of mechanical and thermal stresses. The structural integrity of these components is assured by the use of high strength and temperature-resistant materials such as Inconel alloys. However, these alloys are known to have low thermal conductivity, which makes it difficult to extract heat from inside the component. Copper-b...
Multi-material Inconel 718 – Aluminium parts targeting aerospace applications: ...
Marques, A.; Guimaraes, B.; Bartolomeu, Flávio; Miranda, G.; Silva, Filipe Samuel; Carvalho, O.In this study, the combination of Inconel 718 (IN718) alloy, widely used in aerospace applications, and a highly conductive low-density Aluminium (Al) was hypothesized to achieve a disruptive solution with improved thermal conductivity and significantly lower weight, key aspects of aerospace industry. A multi-material IN718 - Al solution was designed and later fabricated by combining laser surface texturing and...
Innovative 3D-printed osteogenic-stimulating structures for orthopaedic implants
Dias, Juliana Marques; Silva, Filipe Samuel; Gasik, Michael; Bartolomeu, Flávio; Miranda, Maria Georgina Macedo[Excerpt] According to The Lancet, "Total hip arthroplasty is the surgery of the century". In the upcoming decades, approximately 10 million total hip and knee arthroplasties (THA and TKA) are expected annually, aiming to restore complete joint functionality and enable pain-free mobility. However, more than 20% of the existing implant solutions induce severe bone resorption, ultimately requiring revision surger...
NiTi laser textured implants with improved in vivo osseointegration: an experim...
Costa, M. M.; Miranda, Alice Augusta Macedo; Bartolomeu, Flávio; Carvalho, Óscar Samuel Novais; Matos, S.; Miranda, G.; Silva, Filipe SamuelLaser surface texturing is a versatile approach for manufacturing implants with suitable surfaces for os-seointegration. This work explores the use of laser to fabricate NiTi textured implants, testing two dif-ferent groove-based designs. Their performance was evaluated in vivo through implantation in Sprague Dawley rats' femur, being then analyzed after 4 and 12 weeks of implantation. Push-out experiments and ...
3D Multi-Material Laser Powder Bed Fusion: a disruptive approach to design/manu...
Bartolomeu, Flávio; Carvalho, O.; Pires, J.; Cunha, A.; Marques, A.; Gasik, M.; Silva, Filipe Samuel[Excerpt] Engineering has been so far a mono-dimension tool where components are mono-material, dense unoptimized and designed for one or two requirements, due to processes’ limitations. Traditional components diverge entirely from lightweight and multi-material nature structures endowed with a high level of multi-functionality. [...]
Mechanical properties of Ti6Al4V fabricated by laser powder bed fusion: a revie...
Bartolomeu, Flávio; Gasik, Michael; Silva, Filipe Samuel; Miranda, Maria Georgina MacedoTi6Al4V alloy is an ideal lightweight structural metal for a huge variety of engineering applications due to its distinguishing combination of high specific mechanical properties, excellent corrosion resistance and biocompatibility. In this review, the mechanical properties of selective laser-melted Ti6Al4V parts are addressed in detail, as well as the main processing and microstructural parameters that influen...
Multi-functional Inconel 718 - Pure Copper parts fabricated by 3D multi-materia...
Marques, Ana Cristina Ribeiro; Cunha, Ângela Sofia Varela; Gasik, Michael; Carvalho, Óscar Samuel Novais; Silva, Filipe Samuel; Bartolomeu, FlávioCurrently, most aerospace components are under extreme operating conditions such as high fluid pressure, mechanical loads, and thermal stresses [1,2]. The structural integrity of the component is assured by the use of high strength and temperature resistant materials as well distinct cooling mechanisms [1,2]. Inconel 718 (Inc718) is usually used in aerospace components (e.g rocket engines) due to their resistan...