2025 - Sustainable Industrial Processing Summit
SIPS2025 Volume 5. Meyers Intl. Symp. / Composite

Editors:F. Kongoli, P. Assis, H.A.C. Lopera, S. Diaz, S.N. Monteiro, V.S. Candido
Publisher:Flogen Star OUTREACH
Publication Year:2025
Pages:316 pages
ISBN:978-1-998384-46-4 (CD)
ISSN:2291-1227 (Metals and Materials Processing in a Clean Environment Series)
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    FEASIBILITY OF COLD SINTERING PROCESSING OF PURE NIOBIUM FOR ADVANCED APPLICATIONS

    Pedro Henrique Poubel Mendonça da Silveira1; Ary Machado de Azevedo1; Derick Horrana Souza Trindade1; PLÍNIO HONORATO MUELLA PEIXOTO1; MARLLON FRAGA SILVA1; Lisley Madeira Coelho1; Sergio Monteiro1; Marcelo Henrique Prado da Silva1;
    1MILITARY INSTITUTE OF ENGINEERING, Rio de Janeiro, Brazil;
    Type of Paper: Regular
    Id Paper: 53
    Topic: 18

    Abstract:

    Niobium is a strategic material for Brazil, a country that holds the largest global reserves of this element. However, its sintering presents significant challenges, mainly due to the high reactivity of the metal, which promotes oxide formation and hinders consolidation. This study aimed to investigate the feasibility of cold sintering of niobium at different temperatures, seeking to minimize oxidative effects and enable new technological applications. The material used was supplied by CBMM (Companhia Brasileira de Metalurgia e Mineração), and experiments were conducted at temperatures of 125 °C, 150 °C, and 175 °C. To promote the formation of a transient liquid phase, niobium powders were mixed with 10 wt.% of absolute ethanol. Sintering was performed under a simultaneous pressure of 300 MPa, with a holding time of 30 minutes at each specified temperature. After processing, the samples were characterized through density measurements, scanning electron microscopy (SEM), and X-ray diffraction (XRD) analyses. The results indicated that cold sintering of niobium was effective even at the relatively low temperatures employed. XRD analysis revealed only minor peaks corresponding to the NbO phase, indicating a low incidence of oxidation during the process. These findings demonstrate the feasibility of cold sintering pure niobium, paving the way for the development of new components and applications, with advantages in reducing processing temperatures and preserving metallic properties. The use of cold sintering techniques thus represents a promising alternative for processing highly reactive metals such as niobium.

    Keywords:

    Cold Sintering Process; Niobium; XRD; SEM

    Cite this article as:

    Poubel Mendonça da Silveira P, Machado de Azevedo A, Souza Trindade D, HONORATO MUELLA PEIXOTO P, FRAGA SILVA M, Madeira Coelho L, Monteiro S, Prado da Silva M. (2024). FEASIBILITY OF COLD SINTERING PROCESSING OF PURE NIOBIUM FOR ADVANCED APPLICATIONS. In F. Kongoli, P. Assis, H.A.C. Lopera, S. Diaz, S.N. Monteiro, V.S. Candido (Eds.), Sustainable Industrial Processing Summit Volume 5 Meyers Intl. Symp. / Composite (pp. 205-206). Montreal, Canada: FLOGEN Star Outreach