Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Manufacturing of copper-nickel parts by 3D extrusion pastes
Submission Author:
Ana Cavalheiro , RS , Brazil
Co-Authors:
Ana Cavalheiro, Luana Crozatti Rocha , Marcelle Melo de Oliveira, Allana Anniele Barros da Silva , Luana Dalla Vecchia de Lima, Natalia Daudt
Presenter: Ana Cavalheiro
doi://10.26678/ABCM.COBEM2023.COB2023-1295
Abstract
Additive manufacturing (AM) is a key technology for boosting the Brazilian industry in the world scenario, having great potential for application in the aerospace industry. In the case of aerospace materials, outstanding properties to overcome the adverse operating conditions and complex geometries to reduce weight are commonly required. AM technologies have a great potential to achieve these requirements while reducing raw material consumption. Among the metal additive manufacturing, the sinter-based technologies have growing attention due the possibility of production of isotropic components in a shorter time. These technologies combine the versatility of 3D printing with traditional powder metallurgical routes. 3D extrusion of viscous pastes is one of the prominent sinter-based technologies, which was initially developed for production of ceramic components. This technology forms a green part by 3D extrusion layer by layer of a highly viscous paste loaded with the ceramic or metal particles. After printing, post processing consisting of debinding and sintering is performed. In our research group, we are currently developing strategies to adapt 3D extrusion-based processes for production of aerospace metal alloys. Nickel alloys stand out for aerospace engines applications due to their great strength at high temperatures. Moreover, copper as an alloying component shows advantages, increasing corrosion resistance and electrical properties, besides increasing ductility. Nickel alloys have high density, whereas developing strategies to manufacture more complex shapes to reduce weight are still required. Therefore, the fabrication of nickel-copper alloys by 3D extrusion was investigated in this study. Elemental nickel and copper powders were used as starting powders. Water based solution using PVA as binder was added to the elemental powders and mechanically mixed. The powder load was varied from 70 to 85 wt %. Green samples were produced by uniaxial compaction of the viscous pastes and by 3D extrusion. Afterwards, samples were debinded at 500 ºC and sintered at 1050 ºC under high vacuum. At last, the sintered samples were metallography prepared. In this article will be presented the results of microstructural characterization by light microscopy, scanning electron microscopy and X-ray diffraction.Furthermore, the results of porosity measured by Archimedes method and its effects on the mechanical properties will be discussed.The results obtained so far will contribute to adapt and validate 3D extrusion for development and fabrication of aerospace metals.
Keywords
Nickel alloy, Copper, processing, extrusion, Additive manufacturing
