Beneficial effects of a WC addition in FAST-densified tungsten

Novak, Saša; Kocen, Matej; Zavašnik, Andreja Šestan; Galaţanu, A.; Galatanu, Magdalena; Tarancón, Sandra; Tejado, E.; Pastor, J.Y.; Jenuš, Petra

doi:10.1016/j.msea.2019.138666

Cited by 10 publications

(8 citation statements)

References 19 publications

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“…However, the samples have good densities, which increase with the diamond content. For W samples with larger WC insertions, improved mechanical properties have been observed [ 45 ].…”

Section: Resultsmentioning

confidence: 99%

Microengineering Design for Advanced W-Based Bulk Materials with Improved Properties

et al. 2023

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In fusion reactors, such as ITER or DEMO, the plasma used to generate nuclear reactions will reach temperatures that are an order of magnitude higher than in the Sun’s core. Although the plasma is not supposed to be in contact with the reactor walls, a large amount of heat generated by electromagnetic radiation, electrons and ions being expelled from the plasma will reach the plasma-facing surface of the reactor. Especially for the divertor part, high heat fluxes of up to 20 MW/m2 are expected even in normal operating conditions. An improvement in the plasma-facing material (which is, in the case of ITER, pure Tungsten, W) is desired at least in terms of both a higher recrystallization temperature and a lower brittle-to-ductile transition temperature. In the present work, we discuss three microengineering routes based on inclusions of nanometric dispersions, which are proposed to improve the W properties, and present the microstructural and thermophysical properties of the resulting W-based composites with such dispersions. The materials’ behavior after 6 MeV electron irradiation tests is also presented, and their further development is discussed.

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“…However, the samples have good densities, which increase with the diamond content. For W samples with larger WC insertions, improved mechanical properties have been observed [ 45 ].…”

Section: Resultsmentioning

confidence: 99%

Microengineering Design for Advanced W-Based Bulk Materials with Improved Properties

et al. 2023

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“…Before the FAST processing, the reaction chamber was purged several times with high-purity argon and evacuated again. During sintering, the pressure inside the chamber was below 10 Pa [23]. The added WC completely transforms to W 2 C, resulting in a W-W 2 C composite.…”

Section: Materials Irradiation and Testing Methodologymentioning

confidence: 99%

“…Microstructural analysis of as-sintered W-4W 2 C samples reveals isotropic nature of grains present in the sample. The EBSD studies presented in [23] showed that the W 2 C grains are mainly positioned at W grain boundaries, preferentially at triple junctions. The grain size analysis showed that the mean W 2 C grain size is approximately 1 μm, while for the W grains is 7.5 μm in diameter.…”

Section: W-wcmentioning

confidence: 96%

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Development of irradiation tolerant tungsten alloys for high temperature nuclear applications

Terentyev

Jenuš²,

Broco³

et al. 2022

Nucl. Fusion

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Development of refractory metals for application as plasma-facing armour material remains among priorities of fusion research programmes in Europe, China and Japan. Improving the resistance to high temperature recrystallization, enhancing material strength to sustain thermal fatigue cracking and tolerance to neutron irradiation are the key indicators used for the down selection of materials and manufacturing processes to be applied to deliver engineering materials. In this work we investigate the effect of neutron irradiation on mechanical properties and microstructure of several tungsten grades recently developed. Neutron irradiation campaign is arranged for screening purposes and therefore is limited to the fluence relevant for the ITER plasma facing components. At the same time, the neutron exposure covers a large span of irradiation temperatures from 600 up to 1000 °C. Four different grades are included in the study, namely: fine-grain tungsten strengthened by W-carbide (W-4wt.% W2C), fine-grain tungsten strengthened by Zr carbides (W-0.5% ZrC), W alloyed with 10 at.% chromium and 0.5 at.% yttrium (W-10Cr-0.5Y) and technologically pure W plate manufactured according to the ITER specification by Plansee (Austria). The strengthening by W2C and ZrC particles leads to an enhanced strength, moreover, the W-0.5ZrC material exhibits reduced DBTT (compared to ITER specification grade) and is available in the form of thick plate (i.e. high up-scaling potential). The W-10Cr-0.5Y grade is included as the material offering the self-passivation protection against the high temperature oxidation.

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“…tungsten oxides. Novak(Novak et al, 2020) reported a beneficial effect of WC small additions (5-10 vol.%) at the mechanical tests results (flexural strength at 600 o C <1500 MPa for W-10WC vol. ), especially comparing them not only to pure tungsten reference material, but also with TiC-doped tungsten composites with same proportions of binder.The results are shown in Figure1.28.…”

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Aqueous colloidal processing of W and WC-based composites, sintering and mechanical properties at high temperature

Ayala¹

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Acknowledgements / AgradecimientosEsta tesis doctoral es fruto del esfuerzo y del trabajo personal durante estos más de cuatro años, los cuales no habrían sido posibles sin el apoyo, la ayuda y la confianza de muchas personas a lo largo de este periodo. Gracias de todo corazón a todas ellas.En primer lugar, me gustaría agradecerle a mi director de tesis, el Dr. Antonio Javier Sánchez Herencia, por su constante guía y apoyo durante la realización de toda la tesis.Por su supervisión, su fuerza y su ayuda, por su paciencia conmigo y por las mañanas de reunión para organizar y ordenar ideas. Mil gracias por todo lo que has hecho por mí.Deseo también agradecerle a mi co-director de tesis, el Prof. José Ygnacio Pastor Caño, por su confianza durante este proyecto, así como el haber contado conmigo como una más dentro dentro del Departamento.Many thanks to Dr Laura Silvestroni from the Institute of Science and Technology of Ceramics (ISTEC-CNR), for accepting me as a member of her group, her guidance and support all over my stay in Italy and later. I will never forget how much I learnt from you.Agradezco también a la Dra. Begoña Ferrari por su indudable ayuda a la hora de organizar el trabajo, tanto experimental como escrito, y por poner sobre la mesa siempre su toque inconfundible de experiencia y liderazgo.Gracias también a Hyperion M&T, y en especial a Elena Tarrés, por suministrarnos los polvos de carburo de wolframio y, en general, por su interés durante el desarrollo de todo este trabajo.Muchísimas gracias a Sandra Tarancón, sin cuya ayuda no hubiera sido posible la realización de gran parte de la experimental de esta tesis. Gracias por compartir conmigo todo lo que sabes, por la confianza y por esas mañanas y tardes de SEM, y mil gracias también por aguantar mis largas explicaciones sobre coloide-química en los primeros pasitos de tu tesis. ¡Mucho ánimo y a por ella! Gracias también al personal del Departamento de Ciencia de Materiales de la UPM por hacerme sentir como en casa, con especial mención a Toñi y a Josemi, al que echamos todos muchísimo de menos. Agradecer a mis compañeros que imparten conmigo las prácticas de Física por su apoyo y su opinión ante dudas que me iban surgiendo. Con ellos, todo ha sido más fácil. VIMil gracias a mi Colloidal team: Joaco, Ana, Alvarito, Guille, Miguel, Zoilo, Oxel, Pablete, etc., así como a todos los que han pasado por el grupo para realizar sus TFGs o TFMs. Sois el mejor ejemplo que podría tener, las personas que me han cambiado la forma de trabajar y de afrontar los problemas. Con vosotros puedo decir que del ICV no solo me llevo a los mejores compañeros del mundo, sino también grandes amigos. Mil gracias por lo mucho que me habéis dado.Gracias también a mis compis de despacho: JJ, Trivi, Patri, Sara, Jorge, Jesús (el "Titi") y a mis chicas Eli y Berta, por hacer del día a día algo bastante ameno y divertido, y por estar ahí desde primera hora de la mañana. Y gracias también a los que estuvieron por el ICV de paso, como Marina y Mehdi, y al final dejaron huella en mí; y p...

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Beneficial effects of a WC addition in FAST-densified tungsten

Cited by 10 publications

References 19 publications

Microengineering Design for Advanced W-Based Bulk Materials with Improved Properties

Microengineering Design for Advanced W-Based Bulk Materials with Improved Properties

Development of irradiation tolerant tungsten alloys for high temperature nuclear applications

Aqueous colloidal processing of W and WC-based composites, sintering and mechanical properties at high temperature

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