19 documents found, page 1 of 2
Exploring the effect of low concentration of stannum in lead-free BCT-BZT piezo...
Coondoo, Indrani; Alikin, Denis; Abramov, Alexander; Figueiras, Fábio G.; Shur, Vladimir Y.; Miranda, GeorginaPiezoelectric, ferroelectric and electromechanical properties were studied at macroscopic and local scale level in stannum doped (Ba0.88Ca0.12)(SnxZr0.1-xTi0.9)O3 ceramics, with an objective to explore the effect of low content (0 x 0.5 at%) of the substituent (Sn) on the functional properties. The results exemplified that the substitution had an influence on the crystal lattice and microstructure that affe...
Chip morphology evaluation on turning of 316L stainless steel using laser surfa...
Guimarães, Bruno Miguel Pereira; Fernandes, Cristina; Figueiredo, Daniel; Silva, Filipe Samuel; Miranda, GeorginaEuro Powder Metallurgy 2023 Congress & Exhibition, 1 - 4 Outubro 2023. Lisboa, Portugal.; During machining processes, a large amount of heat is generated, especially in the cutting zone, due to the deformation of the material and to the friction of the chip along the surface of the cutting tool, resulting in, a wear increase and consequent reduction of tool life. Surface texturing can help improve these tools t...
Real-time cutting temperature measurement in turning of AISI 1045 steel through...
Guimarães, Bruno; Rosas, José; Fernandes, Cristina M.; Figueiredo, Daniel; Lopes, Hernâni; Paiva, Olga C.; Silva, Filipe Samuel; Miranda, GeorginaDuring machining processes, a high temperature is generated in the cutting zone due to deformation of the material and friction of the chip along the surface of the tool. This high temperature has a detrimental effect on the cutting tool, and for this reason, it is of the utmost importance to assess the cutting temperature in real time during these processes. Despite all the advances and investigation in this f...
Additive manufacturing of embedded thermocouples in WC-Co cutting tools for cut...
Guimarães, Bruno Miguel Pereira; Silva, Filipe Samuel; Fernandes, Cristina M.; Figueiredo, Daniel; Miranda, GeorginaA publicar em PowderMet2023, 18 - 21 jun. 2023, Caesars Palace, Las Vegas, USA; During machining processes, a large amount of heat is generated due to deformation of the material and friction of the chip along the surface of the tool, especially in the cutting zone. This high temperature strongly influences tribological phenomena and adhesion, tool wear, tool life, workpiece surface integrity and quality, chip ...
Influence of micro-textures on cutting insert heat dissipation
Rosas, José; Lopes, Hernani; Guimarães, Bruno; Piloto, P.A.G.; Miranda, Georgina; Silva, Filipe S.; Paiva, Olga C.Metal machining is one of the most important manufacturing processes in today’s pro- duction sector. The tools used in machining have been developed over the years to improve their performance, by reducing the cutting forces, the friction coefficient, and the heat generated during the cutting process. Several cooling systems have emerged as an effective way to remove the excessive heat generated from the chip-t...
The influence of surface finishing on laser heat treatments of a tool steel
Lagarinhos, J. N.; Santos, Simão; Miranda, Georgina; Afonso, Daniel; Torcato, Ricardo; Santos, Carlos; Oliveira, MartinhoLaser heat treatments (LHT) has received growing attention in the last years because of highly localized precision and manufacturing efficiency related to laser processing of moulds steel. Due of its strong resistance and ability to maintain hardness and strength at high temperatures, AISI P20 steel is one of the most widely used tool steel in the plastics injection mould industry. This work presents an experim...
Understanding drop spreading behaviour on WC-10wt%Co cutting tools – an experim...
Guimarães, B.; Silva, J.; Fernandes, Cristina Maria; Figueiredo, D.; Carvalho, O.; Miranda, Georgina; Silva, F. S.WC-Co cutting tools performance under demanding cutting conditions largely depend on the efficiency of the cutting fluid, mainly its ability to remove heat and reduce friction, both highly dependent on the wettability and drop spreading behaviour of the fluid. In this context, this study focuses on the spreading behaviour of machining cutting fluid and water in WC-10 wt%Co cutting tools surface. Contact angles ...
Osseointegration assessment of multi‐material Ti6Al4V‐β TCP implants: an experi...
Costa, Mafalda M.; Miranda, Alice; Bartolomeu, Flávio; Carvalho, Óscar; Matos, Sérgio; Silva, Filipe Samuel; Miranda, GeorginaIn the present study, mono- and multi-material laser textured Ti6Al4V implants are manufactured and characterized in vivo to explore their applicability in orthopedic implants. Laser surface texturing is used for manufacturing grooved Ti6Al4V implants while a pressure-assisted sintering technique is employed to impregnate beta-tricalcium phosphate into grooves for an improved bioactivity. After implantation int...
Mechanical properties of Ti6Al4V fabricated by laser powder bed fusion: a revie...
Bartolomeu, Flávio; Gasik, Michael; Silva, Filipe Samuel; Miranda, GeorginaTi6Al4V 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...
NiTi laser textured implants with improved in vivo osseointegration: an experim...
Costa, M.M.; Miranda, A.; Bartolomeu, F.; Carvalho, O.; Matos, S.; Miranda, Georgina; Silva, F.S.Laser surface texturing is a versatile approach for manufacturing implants with suitable surfaces for osseointegration. This work explores the use of laser to fabricate NiTi textured implants, testing two different 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 hi...