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| Hauptseite > Publikationsdatenbank > Scaling Methods for the Production of Tungsten Fiber-Reinforced Composites via Chemical Vapor Deposition |
| Hauptseite > Publikationsdatenbank > Scaling Methods for the Production of Tungsten Fiber-Reinforced Composites via Chemical Vapor Deposition |
| Book/Dissertation / PhD Thesis | FZJ-2025-04171 |
2025
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag
Jülich
ISBN: 978-3-95806-851-3
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Please use a persistent id in citations: urn:nbn:de:0001-2602031017272.453302525860 doi:10.34734/FZJ-2025-04171
Abstract: The transition toward a sustainable and resource-efficient energy ecosystem has revealed the limitations of existing materials. Emerging technologies, including concentrated solar power (CSP) systems and nuclear fusion reactors, call for significant advancements in material science to achieve mechanical stability, thermal resistance, and even radiation tolerance at exceptional levels. This necessity becomes particularly apparent under the extreme conditions encountered by plasma-facing components (PFCs) in nuclear fusion devices. Tungsten fiber-reinforced composites (WFRCs), such as tungsten fiber-reinforced tungsten (Wf/W), have emerged as promising candidates to meet these stringent requirements and could play a key role in the future advancement of these cutting-edge technologies. This dissertation addresses the persistent challenges of scaling the production of these composite materials from laboratory research to industrial applications. The primary objective is to transform the chemical vapor deposition (CVD) technique, which is traditionally used for thin-film systems in the semiconductor industry, into a scalable process for WFRC production. To achieve this goal, this thesis primarily focuses on the further development of the existing WILMA chemical processing facility at Forschungszentrum Jülich in Germany. The findings are detailed in two previously published articles, which constitute integral parts of this thesis, and are further supplemented by content intended for a forthcoming third publication. The first publication [1] addresses the brittle fracture behavior of pure tungsten at room temperature and aims to ensure consistent material properties of Wf/W composites. For the first time, the fatigue behavior of such composite materials under cyclic mechanical loading conditions was successfully extrapolated, thereby establishing a new reproducibility benchmark and demonstrating that these composites are capable of meeting the strict quality standards of industrial applications.The second publication [2] examines the combination of established consolidation methods and introduces a novel approach to enhance the resilience of critical ceramic interfaces and tungsten fibers in the context of elevated stresses typically faced during sintering processes. The proposed strategy provides new perspectives for the integration of tungsten fibers into a range of matrix materials, thereby potentially broadening the prospective scope of applications for WFRCs. The forthcoming third publication focuses on the chemical vapor infiltration (CVI) technique for the production of Wf/W composites. Extensive modifications to the WILMA chemical processing facility enabled the first successful implementation of CVI at a process-relevant scale, resulting in reduced production time and costs, enhanced material design flexibility, and expanded opportunities for joining tungsten with other materials. The initial prototype sample demonstrated substantial advancements in fiber volume fraction andfracture energy, achieving values that exceeded those of currently used materials by more than two orders of magnitude. Building on these promising results, an optimized design was developed to further increase the production capacity and permit recycling. The advanced setup has already been successfully implemented and is scheduled for comprehensive testing in the near future. In conclusion, this work lays a robust foundation for the potential commercialization of WFRCs while underscoring the necessity for further material characterization and process optimization.
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