Reaction kinetics and phase evolution of nanoporous TaC from metallic precursors.
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| Title: | Reaction kinetics and phase evolution of nanoporous TaC from metallic precursors. |
|---|---|
| Authors: | Ott, Catherine1 (AUTHOR), Peters, Adam2 (AUTHOR), McCue, Ian1 (AUTHOR) ian.mccue@northwestern.edu |
| Source: | Acta Materialia. Apr2026, Vol. 307, pN.PAG-N.PAG. 1p. |
| Subjects: | Carburization, Activation energy, Ultra-high-temperature ceramics, Phase transitions, Microstructure, Metal compounds, Chemical kinetics |
| Abstract: | Ultra-high temperature ceramics (UHTCs) are promising materials for use in next-generation aerospace structures but have processing challenges, particularly with respect to densification. Here, a nano-sized UHTC powder precursor was synthesized via atmospheric pressure gas-phase carburization of nanoporous tantalum to the ultra-high-temperature ceramic, TaC, at unconventionally low temperatures (700–900 °C). First, a 1-D moving interface model was constructed to predict carburization depth and compare data from the present work to that in the literature, and the model was validated for finite geometries (i.e., powders). Then, the kinetic properties of Ta conversion in a carburizing environment were examined over a range of temperatures to determine rate-limiting behavior and activation energy for the process. It was found that the apparent activation energy for carburization was initially low, and conversion proceeded much faster than predicted, suggesting accelerated carbon diffusion pathways. Detailed microstructural analysis was carried out on in-house atomized powders, which did not show evidence of grain boundary diffusion. Instead, it revealed that the effects of residual strain and defects from processing may play a significant role in the carburization rates of tantalum. [Display omitted] [ABSTRACT FROM AUTHOR] |
| Copyright of Acta Materialia is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 191709242 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Reaction kinetics and phase evolution of nanoporous TaC from metallic precursors. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Ott%2C+Catherine%22">Ott, Catherine</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Peters%2C+Adam%22">Peters, Adam</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22McCue%2C+Ian%22">McCue, Ian</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> ian.mccue@northwestern.edu</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Acta+Materialia%22">Acta Materialia</searchLink>. Apr2026, Vol. 307, pN.PAG-N.PAG. 1p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Carburization%22">Carburization</searchLink><br /><searchLink fieldCode="DE" term="%22Activation+energy%22">Activation energy</searchLink><br /><searchLink fieldCode="DE" term="%22Ultra-high-temperature+ceramics%22">Ultra-high-temperature ceramics</searchLink><br /><searchLink fieldCode="DE" term="%22Phase+transitions%22">Phase transitions</searchLink><br /><searchLink fieldCode="DE" term="%22Microstructure%22">Microstructure</searchLink><br /><searchLink fieldCode="DE" term="%22Metal+compounds%22">Metal compounds</searchLink><br /><searchLink fieldCode="DE" term="%22Chemical+kinetics%22">Chemical kinetics</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Ultra-high temperature ceramics (UHTCs) are promising materials for use in next-generation aerospace structures but have processing challenges, particularly with respect to densification. Here, a nano-sized UHTC powder precursor was synthesized via atmospheric pressure gas-phase carburization of nanoporous tantalum to the ultra-high-temperature ceramic, TaC, at unconventionally low temperatures (700–900 °C). First, a 1-D moving interface model was constructed to predict carburization depth and compare data from the present work to that in the literature, and the model was validated for finite geometries (i.e., powders). Then, the kinetic properties of Ta conversion in a carburizing environment were examined over a range of temperatures to determine rate-limiting behavior and activation energy for the process. It was found that the apparent activation energy for carburization was initially low, and conversion proceeded much faster than predicted, suggesting accelerated carbon diffusion pathways. Detailed microstructural analysis was carried out on in-house atomized powders, which did not show evidence of grain boundary diffusion. Instead, it revealed that the effects of residual strain and defects from processing may play a significant role in the carburization rates of tantalum. [Display omitted] [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Acta Materialia is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.actamat.2026.121980 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 1 StartPage: N.PAG Subjects: – SubjectFull: Carburization Type: general – SubjectFull: Activation energy Type: general – SubjectFull: Ultra-high-temperature ceramics Type: general – SubjectFull: Phase transitions Type: general – SubjectFull: Microstructure Type: general – SubjectFull: Metal compounds Type: general – SubjectFull: Chemical kinetics Type: general Titles: – TitleFull: Reaction kinetics and phase evolution of nanoporous TaC from metallic precursors. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Ott, Catherine – PersonEntity: Name: NameFull: Peters, Adam – PersonEntity: Name: NameFull: McCue, Ian IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 04 Text: Apr2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 13596454 Numbering: – Type: volume Value: 307 Titles: – TitleFull: Acta Materialia Type: main |
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