Micro-mechanical and high heat load testing of W-Y2O3 ODS armourmaterials fabricated by novel chemical method and SPS
(English)In: Journal of nanoparticle research, ISSN 1388-0764, E-ISSN 1572-896XArticle in journal (Other academic) Submitted
Oxide-dispersed strengthened (ODS) - tungsten based composites can be fabricated using several methods. In this study W-Y2O3 composite powders were synthesized by an innovative chemical process yielding ultrafine to micron range grains that were subsequently compacted using spark plasma sintering (SPS). Micro-mechanical tests were conducted to investigate the elastic and fracture properties of sintered compacts with grain size from ultrafine to several microns. For the evaluation of the developed material for plasma facing armour application in the fusion reactor, high heat load tests have been performed in an electron beam test facility. Surface effects, i.e. roughening, particle erosion and crack formation in dependence of base temperature and power density, were determined for an applied number of 100 ELM like loads with a pulse duration of 1 ms. The crack paths at the surface and particularly versus the bulk material were investigated to determine the resistance of the material to the formation of cracks parallel to the surface which finally would limit the thermal transfer and lead to local overheating and probably melting. Furthermore, the thermal stability of material, i.e. the resistance to recrystallization was determined by thermal annealing up to 1800 °C and during the electron beam tests by applying heat loads that lead to a surface temperature increase of> 2000°C.
ODS-tungsten, W-Y2O3, Thermal shock test, nano indentation, armour material, PFC, high heat load
Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-101164OAI: oai:DiVA.org:kth-101164DiVA: diva2:546616
QS 20122012-08-242012-08-242012-08-28Bibliographically approved