| Texto completo | |
| Autor(es): |
Bazaglia Kuroda, Pedro Akira
;
Grandini, Carlos Roberto
;
Moreira Afonso, Conrado Ramos
Número total de Autores: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T; v. 39, p. 9-pg., 2025-11-01. |
| Resumo | |
This study aimed to perform a comprehensive chemical and structural characterization of MAO coatings enriched with calcium, phosphorus, magnesium, and carbon, produced on the Ti-25Ta alloy and subsequently subjected to heat treatments at 600, 700, and 800 degrees C. A key challenge in MAO coatings on Ti-25Ta alloys is achieving and maintaining optimal chemical bonding, crystallinity, and structural stability after heat treatment, which are crucial for their mechanical and biological performance. High-resolution X-ray photoelectron spectroscopy (XPS) was employed to quantify the chemical composition and oxidation states of the coatings, providing detailed insights into the surface chemistry and phase evolution. The results demonstrated that the MAO coatings are highly sensitive to heat treatment, with significant modifications in phase composition and chemical states. Heat exposure led to partial reduction of TiO2, formation of sub-stoichiometric Ti2O3, and, at higher temperatures, the emergence of TiC and metallic Ti. In contrast, Ta2O5 remained thermally stable, reflecting the exceptional oxidation resistance of tantalum. The heat treatments also induced partial degradation of surface carbonates (CaCO3 and MgCO3) and the elimination of hydroxyl groups (OH-) due to condensation, while phosphate species remained largely intact. The study highlights the critical role of XPS in elucidating the detailed surface chemistry and phase transformations of MAO-treated Ti-25Ta coatings under thermal treatment conditions. (AU) | |
| Processo FAPESP: | 18/18293-8 - Ligas de titânio: transformações de fases e manufatura aditiva aplicadas na obtenção de materiais com gradientes funcionais |
| Beneficiário: | Rubens Caram Junior |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| 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 |
| Processo FAPESP: | 19/26517-6 - Influência da microestrutura e fases formadas na funcionalização da superfície de ligas beta Ti-25Ta-xZr |
| Beneficiário: | Pedro Akira Bazaglia Kuroda |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |