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Tribocorrosion behavior of NiTi biomedical alloy processed by an additive manuf...
Buciumeanu, Mihaela; Bagheri, Allen; Silva, Filipe Samuel; Henriques, Bruno Alexandre Pacheco de Castro; Lasagni, Andrés F.; Shamsaei, NimaThe purpose of the present study was to experimentally assess the synergistic effects of wear and corrosion on NiTi alloy in comparison with Ti-6Al-4V alloy, the most extensively used titanium alloy in biomedical applications. Both alloys were processed by an additive manufacturing laser beam directed energy deposition (LB-DED) technique, namely laser engineered net shaping (LENS), and analyzed via tribocorrosi...
Development of a novel hybrid Ti6Al4V–ZrO2 surface with high wear resistance by...
Madeira, Sara Cristina Soares; Buciumeanu, Mihaela; Nobre, D.; Carvalho, Óscar Samuel Novais; Silva, Filipe SamuelThe development of implant metal-free surfaces has gained attention since non-benefic results have been re-ported related to the metallic ions released from metal implants to the human body. Ceramic coatings have been proposed as a possible solution however, the detachment of these coatings, during implantation or even in function, can compromise its function. In order to overcome this problem, this work propos...
Design and surface characterization of micropatterned silica coatings for zirco...
Moreira, André; Madeira, Sara Cristina Soares; Buciumeanu, Mihaela; Fialho, Joana; Carvalho, Angela; Silva, Filipe Samuel; Monteiro, Fernando J.The use of zirconia as an alternative biomaterial for titanium implants has been increasing due to its biocompatibility, favorable aesthetic features, less potential for early plaque accumulation and mechanical properties. Despite the developed efforts, strategies to promote an effective osseointegration are still enough. In this sense and combining the silica properties to improve bone formation with the micro...
Ti6Al4V laser surface preparation and functionalization using hydroxyapatite fo...
Faria, D.; Abreu, C. S.; Buciumeanu, Mihaela; Dourado, N.; Carvalho, Óscar Samuel Novais; Silva, F. S.; Miranda, G.This work presents a novel texture design for implants surface functionalization, through the creation of line-shaped textures on Ti6Al4V surfaces and subsequent sintering of hydroxyapatite (HAp) powder into the designated locations. HAp-rich locations were designed to avoid HAp detachment during insertion, thus guaranteeing an effective osseointegration. This process starts by creating textured lines using a N...
Tribocorrosion behavior of veneering biomedical PEEK to Ti6Al4V structures
Sampaio, Miguel Ângelo Guimarães; Buciumeanu, Mihaela; Henriques, Bruno; Silva, Filipe Samuel; Souza, J. C. M.; Gomes, J. R.In dentistry, prosthetic structures must be able to support masticatory loads combined with a high biocompatibility and wear resistance in the presence of a corrosive environment. In order to improve the simultaneous wear and corrosion response of highly biocompatible prosthetic structures, a veneering poly-ether-ether-ketone (PEEK) to Ti6Al4V substrate was assessed by tribocorrosion analyses under conditions m...
Abrasive and sliding wear of resin composites for dental restorations
Souza, J. C. M.; Bentes, Ana Catarina Fernandes; Reis, Kelly; Gavinha, Sandra; Buciumeanu, Mihaela; Henriques, Bruno; Silva, Filipe Samuel; Gomes, J. R.The aim of this work was to study the abrasive and reciprocating sliding wear resistance of four commercial resin composites for dental restorations. Resin composite samples were divided into four groups considering the different materials and then separated for compressive, abrasive and sliding tests (n=10). Micro-abrasion tests were performed against a stainless steel rotating ball on 3 N normal load for 300 ...
Comparison between PEEK and Ti6Al4V concerning micro-scale abrasion wear on den...
Sampaio, Miguel Ângelo Guimarães; Buciumeanu, Mihaela; Henriques, B.; Silva, Filipe Samuel; Souza, J. C. M.; Gomes, J. R.In the oral cavity, abrasive wear is predictable at exposed tooth or restorative surfaces, during mastication and tooth brushing. Also, wear can occur at contacting surfaces between theTi-based prosthetic structures and implants in presence of abrasive compounds from food or tooth paste. Thus, the aim of this work was to compare the abrasive wear resistance of PEEK and Ti6Al4V on three-body abrasion related to ...
Improvement on sliding wear behavior of Al/Cast iron tribopair by CNT’s reinfor...
Carvalho, Óscar Samuel Novais; Buciumeanu, Mihaela; Soares, Delfim; Gomes, J. R.; Silva, Filipe SamuelThe results presented in this work show the wear characterization of Al-Si matrix composites reinforced by multiwall carbon nanotubes (MWCNTs) under dry reciprocating sliding conditions against a grey cast iron (GCI). The wear resistance is investigated as a function of the carbon nanotube (CNT) content that varied from 2 to 6 wt%. The results demonstrated that the CNT content plays a relevant role in the wear ...
Tribocorrosion behaviour of hot pressed CoCrMo−Al2O3 composites for biomedical ...
Doni, Z.; Alves, A. C.; Toptan, Fatih; Pinto, A. M. P.; Rocha, L. A.; Buciumeanu, Mihaela; Palaghian, L.; Silva, F. S.Alumina/alumina wear couple can lower the wear rates and thus metallic ion releasing on load bearing metallic implant materials. However, the low fracture toughness of ceramics is still a major concern. Therefore, the present study aims to process and to triboelectrochemically characterise the 5 and 10 vol.-%Al2O3 reinforced CoCrMo matrix composites. Corrosion and tribocorrosion behaviour of the composites were...
Dry sliding and tribocorrosion behaviour of hot pressed CoCrMo biomedical alloy...
Doni, Z.; Alves, A. C.; Toptan, Fatih; Gomes, J. R.; Ramalho, A.; Buciumeanu, Mihaela; Palaghian, L.; Silva, F. S.Alternative processing routes are being widely studied for biomedical implant materials. Hot pressing (HP) is a powder metallurgy (P/M) process that combines the pressing and sintering steps simultaneously and therefore, provides a simpler production route with further advantages. However, dry sliding and tribocorrosion behaviour of HP CoCrMo alloy is yet to be studied. Since the implants are exposed to wear st...