Densification and properties of zirconia prepared by three different sintering techniques
2007 (English)In: Ceramics International, ISSN 0272-8842, E-ISSN 1873-3956, Vol. 33, no 8, 1603-1610 p.Article in journal (Refereed) Published
Densification of nanocrystalline yttria stabilized zirconia (YSZ) powder with 8 mol% Y2O3, prepared by a glycine/nitrate smoldering combustion method, was investigated by spark plasma sintering, hot pressing and conventional sintering. The spark plasma sintering technique was shown to be superior to the other methods giving dense materials (>= 96%) with uniform morphology at lower temperatures and shorter sintering time. The grain size of the materials was 0.21, 0.37 and 12 mu m after spark plasma sintering, hot pressing and conventional sintering, respectively. Total electrical conductivity of the materials showed no clear correlation with the grain size, but the activation energy for spark plasma sintered materials was slightly higher than for materials prepared by the two other densification methods. The hardness, measured by the Vickers indentation method, was found to be independent on grain size while fracture toughness, derived by the indentation method, was slightly decreasing with increasing grain size.
Place, publisher, year, edition, pages
2007. Vol. 33, no 8, 1603-1610 p.
grain size, electrical conductivity, hardness, YSZ, densification, fracture toughness
IdentifiersURN: urn:nbn:se:kth:diva-89033DOI: 10.1016/j.ceramint.2006.07.005ISI: 000250424800032OAI: oai:DiVA.org:kth-89033DiVA: diva2:502656
QC 201203052012-02-142012-02-142012-03-05Bibliographically approved