Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Powder metallurgical manufacturing of Graphene reinforced titanium composites
Submission Author:
Fernanda Signor , RS
Co-Authors:
Fernanda Signor, Gabriela Emanuelle Valeriano Soares de Souza, Sérgio Noal Alves, Maurício Zubaran, Paulo Mareze, Natalia Daudt
Presenter: Fernanda Signor
doi://10.26678/ABCM.COBEM2023.COB2023-2149
Abstract
Titanium shows a combination of mechanical strength, corrosion resistance and biocompatibility, which makes it one of the major construction materials for aerospace and biomedical industries. However, when compared to other metals alloys such as high strength aluminum alloys, titanium shows a low stiffness and higher density. An alternative to increase stiffness while reducing weight is the use of metal matrix composite with addition of reinforcement materials. Graphene has been reported as a promising reinforcement for metal matrix composites (MMCs) due its combination of stiffness, strength, thermal properties and low density. Another interesting characteristic of graphene is its antimicrobial properties. Therefore, graphene reinforced titanium is attractive for titanium both biomedical and aerospace industries can be benefit: for demonstration dental implants can be benefit from the combination of titanium biocompatibility and graphene antimicrobial properties while aerospace components can be benefit from the combination of titanium specific strength and graphene stiffness. In the present work, manufacturing of graphene-reinforced titanium composites using a powder metallurgy route was investigated. For that, Ti parts with 0, 0.2 and 0.4 wt,% of graphene were produced by warm compaction of metal injection molding (MIM) feedstocks. MIM is an established PM route for fabrication of complex shaped parts. Warm compaction was used in this study due to its similarity with MIM process and the possibility to process a small amount of materials. Prior to the feedstock production, graphene was mixed to the titanium powder in a roll milling, then the MIM feedstock was produced by adding the titanium-graphene mixture to a binder system. After warm compaction, the green parts were thermally debinded and sintered in a vacuum furnace. Microstructure was analyzed by light and scanning electron microscopy. Porosity was measured by weight measurements using the Archimedes principle and by image analyses. Hardness values were measured using a Vickers Microhardness Tester. Graphene addition did not result in a significant change in microstructure or porosity values. However, the hardness values decreased from 219.8 ± 15.6 to 191.6 ± 8.8 with graphene addition. Young Modulus analysis by vibroacoustic test and compression tests are currently being realized and the results will be presented. The results obtained so far indicated MIM is a promising route for manufacturing graphene reinforced metal matrix composites.
Keywords
Titanium-Graphene, Metal Matrix Composites, powder metallurgy, mechanical test, Vibroacoustic Test
