Enhanced tungsten densification via modified Field-Assisted Sintering

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F25%3A00645693" target="_blank" >RIV/61389021:_____/25:00645693 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S2352492825014515" target="_blank" >https://www.sciencedirect.com/science/article/pii/S2352492825014515</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.mtcomm.2025.112939" target="_blank" >10.1016/j.mtcomm.2025.112939</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Enhanced tungsten densification via modified Field-Assisted Sintering

Popis výsledku v původním jazyce

Field-assisted sintering (FAST) is a promising method for achieving high-density materials from powders. Its potential for producing tungsten with suitable properties for plasma-facing components (PFCs) in fusion reactors has recently garnered significant attention. While FAST offers advantages over traditional powder metallurgy, it is hindered by limitations including the maximum achievable current density passing through the specimen, which can restrict material improvements. This study presents a straightforward method to significantly increase current density by encapsulating tungsten powder within a graphite foil coated with electrically insulating boron nitride on one side. The resulting tungsten specimens exhibited improved microstructural and mechanical properties compared to those sintered using standard graphite foil. This enhancement is attributed to increased current density, facilitating densification and local temperature elevation. While elevated carbon saturation and minor tungsten carbide formation occurred, their impact on mechanical properties was negligible due to their confinement to the specimen edges. Moreover, our study demonstrates that modifying a single sintering parameter significantly influences tungsten properties, enabling tailored material characteristics. Decreasing sintering temperature or duration resulted in suboptimal material properties. Conversely, extending the sintering time or employing a vacuum atmosphere significantly enhanced tungsten density and improved the overall mechanical properties. These findings highlight the versatility of our approach, which can be adapted to various FAST configurations for producing tungsten components potentially suitable for PFCs applications.

Název v anglickém jazyce

Enhanced tungsten densification via modified Field-Assisted Sintering

Popis výsledku anglicky

Field-assisted sintering (FAST) is a promising method for achieving high-density materials from powders. Its potential for producing tungsten with suitable properties for plasma-facing components (PFCs) in fusion reactors has recently garnered significant attention. While FAST offers advantages over traditional powder metallurgy, it is hindered by limitations including the maximum achievable current density passing through the specimen, which can restrict material improvements. This study presents a straightforward method to significantly increase current density by encapsulating tungsten powder within a graphite foil coated with electrically insulating boron nitride on one side. The resulting tungsten specimens exhibited improved microstructural and mechanical properties compared to those sintered using standard graphite foil. This enhancement is attributed to increased current density, facilitating densification and local temperature elevation. While elevated carbon saturation and minor tungsten carbide formation occurred, their impact on mechanical properties was negligible due to their confinement to the specimen edges. Moreover, our study demonstrates that modifying a single sintering parameter significantly influences tungsten properties, enabling tailored material characteristics. Decreasing sintering temperature or duration resulted in suboptimal material properties. Conversely, extending the sintering time or employing a vacuum atmosphere significantly enhanced tungsten density and improved the overall mechanical properties. These findings highlight the versatility of our approach, which can be adapted to various FAST configurations for producing tungsten components potentially suitable for PFCs applications.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20506 - Coating and films

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Materials Today Communications

ISSN

2352-4928

e-ISSN

2352-4928

Svazek periodika

46

Číslo periodika v rámci svazku

June

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

12

Strana od-do

112939

Kód UT WoS článku

001507544400001

EID výsledku v databázi Scopus

2-s2.0-105006478593