Microstructure and mechanical properties of alumina 5vol% zirconia nanocomposites prepared by powder coating and powder mixing routes

Physical and mechanical properties of Ta2O5 doped zirconia-toughened alumina (ZTA) composites

“…This can be significantly improved by the addition of yttria stabilized zirconia, which improves both the flexural strength and fracture toughness [1]. Zirconia -toughened-alumina (ZTA) materials have been used for decades for wear parts and cutting tools due to their high strength, hardness, toughness and abrasion resistance [2].…”

The Peculiarities of Structure Formation and Properties of Zirconia-Based Nanocomposites with Addition of Al2O3 and NiO

“…Hardness values for 3Y-ZrO 2 -Al 2 O 3 composite increased slightly from 12.0 ± 0.2 to 12.45 ± 0.3 GPa and for 3Y-ZrO 2 -NiO composite from 12.0 ± 0.2 to 12.1 ± 0.3 GPa. We know that the absolute fracture toughness values obtained by the indentation method could be overestimated, but this technique has been approved by many authors to provide the estimation of the fracture toughness values for samples with high-density levels, where the porosity cannot have effect on crack propagation [11, 24–28]. …”

“…These stresses are conditioned with CTE mismatch between matrix material and inclusions. The calculation of the level of residual stresses ( q ) and its influence on fracture toughness values was done with the equation from Li [11] or Kern [28] studies, …”

Development and mechanical characterization of novel ceramic foams fabricated by gel-casting

“…From a compositional point of view, considering the effect of the dispersion of fine ZrO 2 grains in an alumina matrix on its mechanical behavior [33][34][35], the formation and propagation of the cracks in the ceramic walls of the porous components could be controlled by the exploitation of aluminazirconia composites.…”

“…Alumina-zirconia composite ceramics are widely used for various structural applications, due to their increased mechanical properties produced by the dispersion of fine ZrO 2 grains inside the alumina matrix. In fact, the dispersion of 5-20 vol% tetragonal zirconia particles in the alumina matrix can significantly improve the fracture toughness of the neat matrix due to the tetragonal/monoclinic transformation of the zirconia phase under loading [33][34][35]. Most of the current applications of alumina-zirconia composites are based on dense, fully sintered materials, without porosity.…”