16 documents found, page 1 of 2
Bioinspired piezoelectric composite material with antibacterial effect
Pinto, João Pedro Figueiredo; Padrão, Jorge; Gasik, M.; Carvalho, Óscar Samuel Novais; Silva, Filipe SamuelBacterial resistance is becoming more widespread due to healthcare and agriculture antibiotics' excessive use. Current solutions are focused on preventing biofilm formation with chemical surface coatings (antibiotics) that kill the bacteria once they arrive on the surface. This approach makes bacteria even more multi-drug resistant. Additionally, the use of contaminated shoe soles can impart microbial dissemina...
Influence of temperature processing on the microstructure and hardness of the 4...
Cunha, A.; Marques, A.; Gasik, M.; Trindade, B.In this study, samples of 420 stainless steel were obtained by hot pressing from powder at temperatures from 1,100 to 1,200°C. The aim was to explore the influence of the processing temperature on their grain size, microstructure, densification and mechanical properties. The results showed that it is possible to produce dense samples at these sintering temperatures. The sintering temperature influenced the dens...
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. [...]
Multi-material cellular structured orthopedic implants design: in vitro and bio...
Costa, Ana Mafalda Meneses; Lima, Rui Augusto Ribeiro; Alves, N.; Silva, Nuno André Martins; Gasik, M.; Silva, Filipe Samuel; Bartolomeu, FlávioIn this study, Selective Laser Melting (SLM) was used to produce mono-material Ti64Al4V-and NiTi-cubic cellular structures with an open-cell size and wall thickness of 500 mu m and 100 mu m, respectively. Bioactive beta-tricalcium phosphate (beta TCP) and polymer poly-ether-ether ketone (PEEK) were used to fill the produced structures open-cells, thus creating multi-material components. These structures were ch...
3D Multi-Material-Selective-Laser-Melting: technology, fabrication and prototypes
Bartolomeu, Flávio; Pires, J.; Marques, A.; Cunha, A.; Carvalho, O.; Gasik, M.; Silva, F. S.[Excerpt] Contrarily to nature, human traditional strategies and inventions both from process and products point of view, use brute force, heavy and inefficient, single and inanimate material (like brick, steel and glass) solutions with unoptimized architectures [1] . To create and developed superior engineering solutions, advanced manufacturing technologies are necessary to evolve from mono-material to multi-m...
Multi-material cellular structured orthopedic implants design: In vitro and bio...
Costa, M.M.; Lima, R.; Alves, N.; Silva, N.A.; Gasik, M.; Bartolomeu, F.; Miranda, G.In this study, Selective Laser Melting (SLM) was used to produce mono-material Ti64Al4V- and NiTi-cubic cellular structures with an open-cell size and wall thickness of 500 μm and 100 μm, respectively. Bioactive beta-tricalcium phosphate (βTCP) and polymer poly-ether-ether ketone (PEEK) were used to fill the produced structures open-cells, thus creating multi-material components. These structures were character...
Multi-material cellular structured orthopedic implants design: in vitro and bio...
Costa, M. M.; Lima, R.; Alves, N.; Silva, N. A.; Gasik, M.; Silva, F. S.; Bartolomeu, F.; Miranda, GeorginaIn this study, Selective Laser Melting (SLM) was used to produce mono-material Ti64Al4V- and NiTi-cubic cellular structures with an open-cell size and wall thickness of 500 μm and 100 μm, respectively. Bioactive beta-tricalcium phosphate (βTCP) and polymer poly-ether-ether ketone (PEEK) were used to fill the produced structures open-cells, thus creating multi-material components. These structures were character...
Development of β-TCP-Ti6Al4V structures: driving cellular response by modulatin...
Costa, M. M.; Lima, Rui Augusto Ribeiro; Fonseca, Francisca Rocha Melo; Bartolomeu, Flávio; Alves, N.; Miranda, Alice Augusta Macedo; Gasik, M.Load-bearing implants success is strongly dependent on several physical and chemical properties that are known to drive cellular response. In this work, multi-material β-TCP-Ti6Al4V cellular structures were designed to combine Ti6Al4V mechanical properties and β-Tricalcium Phosphate bioactivity, in order to promote bone ingrowth as the bioactive material is being absorbed and replaced by newly formed bone. In t...
A study on the production of thin-walled Ti6Al4V parts by selective laser melting
Miranda, Maria Georgina Macedo; Faria, Susana; Bartolomeu, Flávio; Pinto, E.; Alves, N.; Peixinho, Nuno; Gasik, M.; Silva, Filipe SamuelSelective Laser Melting (SLM) is an extremely versatile technology especially suited for the manufacturing of thin-walled parts. Micro-sized parts are highly influenced and dependent on the SLM processing parameters; thus being indispensable to assess the influence of processing parameters on SLM fabrication, as isolated parameters but also their interactions. In this study, the influence of SLM laser power and...
Predicting the output dimensions, porosity and elastic modulus of additive manu...
Bartolomeu, Flávio; Fonseca, Jaime C.; Peixinho, Nuno; Alves, N.; Gasik, M.; Silva, Filipe Samuel; Miranda, Maria Georgina MacedoSLM accuracy for fabricating porous materials is a noteworthy hindrance when aiming to obtain biomaterial cellular structures owing precise geometry, porosity, open-cells dimension and mechanical properties as outcomes. This study provides a comprehensive characterization of seventeen biomaterial Ti6Al4V-based structures in which experimental and numerical investigations (compression stress-strain tests) were c...