7 documents found, page 1 of 1
High-temperature strength multi-functional multi-material structures for aerosp...
Marques, Ana Cristina RibeiroO funcionamento de um rocket engine consiste em expelir gás a alta temperatura para produzir impulso e levantá-lo do solo. As temperaturas de combustão são extremamente elevadas, pelo que o arrefecimento destes componentes é crítico para evitar a sua destruição. No entanto, alguns engines são mais difíceis de arrefecer devido à sua grande área superficial, o que leva a uma diminuição da temperatura de funcionam...
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...
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-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...
3D Multi-Material Laser Powder Bed Fusion: an innovative 420 stainless steel-Cu...
Cunha, Ângela Sofia Varela; Marques, Ana Cristina Ribeiro; Silva, Filipe Samuel; Gasik, Michael; Trindade, Bruno; Carvalho, Óscar Samuel NovaisThe plastic injection molding industry is one of the fastest-growing industries in the world since it produces a huge amount of plastic-based components of various types and sizes for the electronics, automotive, pharmaceutical, and aerospace industries [1,2]. However, although it presents numerous advantages (high dimensional and geometric precision, repeatability, and adaptability to a wide range of materials...
Optimization of zirconia surface textured designs using Nd:Yag laser for biomed...
Marques, Ana Cristina Ribeiro; Cunha, Ângela Sofia Varela; Henriques, Bruno Alexandre Pacheco de Castro; Madeira, Sara Cristina SoaresThe development of surface textured designs has influence in primary stability of surgically placed implants since a textured surface allows to firmer mechanical link to the surrounding tissue. Laser technology has been investigated to develop new surface designs on green zirconia compacts by cold pressing. Nd:Yag laser were used to produce several strategies and different laser parameters (laser power, speed a...
Production and optimization of 316L stainless steel dimples by laser surface te...
Cunha, Ângela Sofia Varela; Ferreira, Ana Rita Machado; Marques, Ana Cristina Ribeiro; Trindade, Bruno; Silva, Filipe SamuelSurface patterning is of increasing interest in modern manufacturing processes to achieve better results in terms of wear resistance and friction of mechanical parts and tools and, consequently, to improve their lifetime in service conditions [1]. Several approaches have been used to modify the surface properties of steel components, namely deposition of coatings, sandblasting, and texturing by electron beam, e...