Processing of different alumina–zirconia composites by slip casting

Three different alumina–zirconia composites: Sintering, microstructure and mechanical properties

“…The finer particles of Y-PSZA was responsible to its higher specific surface area with respect to that of Al 2 O 3 and Y-PSZ. The higher S g of the ZN powders with respect to that of Al 2 O 3 was attributed to the fine-sized ZrO 2 on the Al 2 O 3 particles [6]. Table 1 shows the green density values of the different Al 2 O 3 -ZrO 2 composites.…”

“…The more frequent particle diameters of 10.5ZN were in the same range as those of Al 2 O 3 ; whereas, for the 22ZN powder the more frequent particle diameters became greater (0.40-0.60 mm). Although the Zr (IV) precursor route avoided the formation of ZrO 2 aggregates on the Al 2 O 3 particles [6], it let to aggregates of some Al 2 O 3 particles with very fine ZrO 2 uniformly distributed. The diameters of the Al 2 O 3 aggregates increased with increasing the ZrO 2 content.…”

“…For the colloidal method, zirconium (IV)-propoxide solution (70 wt% in 1-propanol) (Sigma-Aldrich, Ireland) was added dropwise to a stable alumina (A16) suspension in absolute ethanol; this method was described in a previous paper [6]. The compositions used to prepare Al 2 O 3 -ZrO 2 composites are summarized in Table 1.…”

“…In a recent paper we reduced the ZrO 2 particle size by using a Zr (IV) precursor route [6]; smaller particles with respect to the classical powder mixing route, homogeneously distributed on the Al 2 O 3 particle surfaces were obtained. Szutkowska [7] studied the fracture resistance behavior of sintered alumina-10 wt% zirconia (E7 vol% ZrO 2 ) produced either with unstabilized ZrO 2 or 3 mol% yttria-partially stabilized zirconia powders; he measured the fracture toughness of these composites and pure alumina by different methods.…”

Humic Acid as Dispersant of an Alumina Suspension and its Rheological Behaviour

“…The properties of alumina such as high mechanical strength, resistance to thermal shock, resistance to wear, non-oxidizability and low thermal conductivity have motivated the studies in this area, including alumina composites with other metallic oxides in order to further improve some of these properties [1][2][3] .…”