Memorias de investigación
Ponencias en congresos:
Self-passivating tungsten alloys of the system W-Cr-Y: characterization and testing
Año:2016
Áreas de investigación
  • Ingenierías
Datos
Descripción
Tungsten is presently the main candidate material for the first wall armour of future fusion reactors. However, if a loss of coolant accident with simultaneous air ingress into the vacuum vessel occurs, the temperature of the in-vessel components would exceed 1000oC, leading to the undesirable formation of volatile and radioactive tungsten oxides. A way to prevent this serious safety issue is the addition of oxide-forming alloying elements to pure tungsten which, in presence of oxygen at high temperatures, promote the development of a self-passivating oxide layer and protects tungsten against further oxidation. In this work, bulk tungsten alloys of the W-Cr-Y system with different concentrations of the alloying elements are studied in order to establish their optimum composition for lowest possible oxidation rate and best self-passivating behaviour together with acceptable thermal and mechanical properties. The materials are manufactured by mechanical alloying and subsequent densification by hot isostatic pressing. Microstructural investigations of the bulk material and the thin oxide layer developed after oxidation as well as the thermal conductivity and mechanical properties of the alloys at different temperatures are presented. The W-Cr-Y alloys exhibit an ultrafine grained microstructure with an average grain size around 100 nm. A summary of the results of different tests under conditions relevant to the expected operation as first wall material is shown: oxidation tests under isothermal and accident-like conditions; high heat flux tests at GLADIS (Garching Large Divertor Sample Test Facility) up to 2 MW/m2 , according to the power load expected at the blanket first wall; and thermal-shock tests at JUDITH (Juelich Divertor Test Facility Hot Cells) to simulate e.g. loads by photon flashes occurring at the first wall of a DEMO. Compared to previous alloys of the system W-Cr-Ti, the W-Cr-Y alloys exhibit significantly lower oxidation rates both under isothermal and accident-like conditions.
Internacional
Si
Nombre congreso
29th Symposium on Fusion Technology
Tipo de participación
960
Lugar del congreso
Praga, Republica Checa
Revisores
Si
ISBN o ISSN
00000000
DOI
Fecha inicio congreso
05/09/2016
Fecha fin congreso
09/09/2016
Desde la página
434
Hasta la página
434
Título de las actas
29th Symposium on Fusion Technology Book of abstracts
Esta actividad pertenece a memorias de investigación
Participantes
  • Autor: Carmen García-Rosales Materials Department, CEIT-IK4, Paseo de Manuel Lardizabal 15, E-20018 San Sebastian, Spain;Tecnun, University of Navarra, Paseo de Manuel Lardizabal 15, E-20018 San Sebastian, Spain
  • Autor: Aida Calvo Materials Department, CEIT-IK4, Paseo de Manuel Lardizabal 15, E-20018 San Sebastian, Spain;Tecnun, University of Navarra, Paseo de Manuel Lardizabal 15, E-20018 San Sebastian, Spain
  • Autor: Nerea Ordas Materials Department, CEIT-IK4, Paseo de Manuel Lardizabal 15, E-20018 San Sebastian, Spain;Tecnun, University of Navarra, Paseo de Manuel Lardizabal 15, E-20018 San Sebastian, Spain
  • Autor: Iñigo Iturriza Materials Department, CEIT-IK4, Paseo de Manuel Lardizabal 15, E-20018 San Sebastian, Spain
  • Autor: Freimut Koch Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, D-85748 Garching, Germany
  • Autor: Karsten SCHLUTER Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, D-85748 Garching, Germany
  • Autor: Henri Greuner Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, D-85748 Garching, Germany
  • Autor: Rudolf Neu Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, D-85748 Garching, Germany
  • Autor: Gerald Pintsuk Institute of Energy and Climate Research ¿ Plasmaphysics, Partner of the Trilateral Euregio Cluster (TEC), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
  • Autor: Andrey LITNOVSKY Institute of Energy and Climate Research ¿ Plasmaphysics, Partner of the Trilateral Euregio Cluster (TEC), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
  • Autor: Tobias Wegener Institute of Energy and Climate Research ¿ Plasmaphysics, Partner of the Trilateral Euregio Cluster (TEC), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
  • Autor: Marcin RASINSKI Institute of Energy and Climate Research ¿ Plasmaphysics, Partner of the Trilateral Euregio Cluster (TEC), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
  • Autor: Jose Ygnacio Pastor Caño UPM
  • Autor: Elena Maria Tejado Garrido UPM
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Materiales Estructurales Avanzados y Nanomateriales
  • Centro o Instituto I+D+i: CENTRO INVEST. MATERIALES ESTRUCTURALES (CIME)
  • Departamento: Ciencia de Materiales