1,720,995 research outputs found
Mechanical properties and microstructure of (CeO2)-stabilised ZrO2/Al2O3 composites
No full textIn this investigation a series of Al2O3-ZrO2 composites materials were prepared using unstabilised ZrO2 or different amount of either Y2O3 or CeO2 for stabilising the ZrO2 in its metastable tetragonal form. The mechanical properties (hardness, bend strength and toughness) were measured and the influence of the different micro structure obtained as well as the role of phase transformation and micro cracks has been assessed
Il ruolo della spettrometria di massa nell'analisi termica differenziale di materiali ceramici avanzati
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Mechanical properties of flo-deflocculated and milled powders in the Al2O3/ZrO2(CeO2) system
No full textSamples of alumina, zirconia and their mixtures were prepared using powders produced by two different processes. The first process only involved the flo-deflocculation of diluted suspensions whereas the second required two steps, first flo-deflocculation and then ball milling of the slurries. Materials comprising a matrix containing a relatively small quantity of the dispersed phase (20 vol% and 80 vol% ZrO2) show better properties when they are produced from flo-deflocculated powders. When samples contain a large quantity of the dispersed phase, milling after flo-deflocculation is beneficial because it provides better homogeneity, which provides greater density and strength although toughness is not significantly improved
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