| Texto completo | |
| Autor(es): |
Goncalves, Vinicius Richieri Manso
;
Caha, Ihsan
;
Alves, Alexandra Cruz
;
Toptan, Fatih
;
Rocha, Luis Augusto
Número total de Autores: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | METALS; v. 12, n. 6, p. 17-pg., 2022-06-01. |
| Resumo | |
Novel in-situ Ti-based matrix composites (TMCs) were developed through the reactive hot pressing of Ti + NbC powder blends. Due to the chemical reaction that occurred in the solid-state during processing, the produced samples were composed of an Nb-rich beta-Ti phase that formed a metallic matrix along with Ti2C as a reinforcing phase. By employing different proportions of Ti:NbC, the phase composition of the alloys was designed to contain different ratios of alpha-Ti and beta-Ti. The present work investigated the corrosion and tribocorrosion behavior of the composites, compared to unreinforced Ti, in a phosphate-buffered solution (PBS) at body temperature. Corrosion tests included potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). Tribocorrosion tests were carried out using a ball-on-plate tribometer with sliding performed at open circuit potential (OCP) and under anodic potentiostatic conditions. Results showed that the stabilization of the beta phase in the matrix led to a decrease in the hardness. However, the formation of the in-situ reinforcing phase significantly improved the tribocorrosion behavior of the composites due to a load-carrying effect, lowering the corrosion tendency and kinetics under sliding. Furthermore, localized corrosion was not observed at the interface between the reinforcing phase and the matrix. (AU) | |
| Processo FAPESP: | 19/07953-0 - Síntese in-situ de compósitos de matriz à base de Ti com gradiente funcional produzidos por rota metalúrgica líquida de baixo custo |
| Beneficiário: | Vinícius Richieri Manso Gonçalves |
| Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Doutorado Direto |
| Processo FAPESP: | 17/24300-4 - Um novo conceito para produzir materiais bio-funcionalizados com gradiente de propriedades para implantes ortopédicos |
| Beneficiário: | Luís Augusto Sousa Marques da Rocha |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 18/00746-6 - Desenvolvimento e caracterização de compósitos in-situ de matriz de Ti-Nb para aplicação biomédica |
| Beneficiário: | Vinícius Richieri Manso Gonçalves |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado Direto |