| Texto completo | |
| Autor(es): |
Bastos, Marielle
;
Rossi, Mariana Correa
;
Afonso, Conrado Ramos Moreira
;
Grandini, Carlos Roberto
;
Kuroda, Pedro Akira Bazaglia
Número total de Autores: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T; v. 39, p. 10-pg., 2025-11-01. |
| Resumo | |
This study aims to develop novel biomedical Ti-based alloys from the Ti-20Nb-Ta system (Ta = 0, 10, and 20 wt %) with surfaces functionalized by bioactive elements (Ca and P) through micro-arc oxidation (MAO). EDS analysis confirmed that the produced alloys closely match the nominal composition and exhibit good chemical homogeneity. The MAO process generated porous ceramic layers enriched with Ca and P. Structural and microstructural characterization (SEM and XRD) revealed Ta as a beta-stabilizing element: Ti-20Nb exhibits an alpha ''+beta microstructure, Ti-20Nb-10Ta shows alpha ''+omega+beta phases, and Ti-20Nb-20Ta stabilizes as a single-phase beta alloy. Regarding the MAO coating, crystalline TiO2 in anatase and rutile phases was observed on Ti-20Nb and Ti-20Nb-10Ta, whereas only anatase was detected on Ti-20Nb-20Ta. Low XRD crystallinity indicates oxides of Ta and Nb on the MAO surfaces are predominantly amorphous. Mechanical characterization showed Ti-20Nb has the lowest elastic modulus (58 GPa), favoring mechanical compatibility with bone, while Ti-20Nb-20Ta exhibited the lowest hardness (250 HV). Ti-20Nb-10Ta presented higher hardness and modulus, attributed to the omega phase. Surface evaluation demonstrated that the rutile phase increased both hardness and water contact angle, improving surface hydrophobicity. Despite this, all alloys remained hydrophilic, with Ti-20Nb-20Ta showing the lowest contact angle (theta = 40 degrees) due to the absence of rutile. Overall, Ti-20Nb combines favorable mechanical properties for orthopedic applications (low modulus), whereas Ti-20Nb-20Ta offers superior surface characteristics, potentially enhancing implant integration and bioactivity. These findings provide a comprehensive understanding of the interplay between composition, microstructure, surface modification, and functional performance of Ti-Nb-Ta biomedical alloys. (AU) | |
| Processo FAPESP: | 24/01132-2 - Centro Multidisciplinar para o Desenvolvimento de Tecnologia Assistiva (CMDTA) |
| Beneficiário: | Carlos Roberto Grandini |
| Modalidade de apoio: | Auxílio à Pesquisa - Centros de Ciência para o Desenvolvimento |
| Processo FAPESP: | 23/16836-2 - Plataforma Multiusuário para obtenção de Pós através de Atomização Ultrasônica e Impressão 3D de Ligas de Titânio, multiprincipais e refratárias para Aplicações Biomédicas e Avançadas |
| Beneficiário: | Conrado Ramos Moreira Afonso |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa Infraestrutura - Pequeno Médio Porte |