Effect of CeO2 addition on densification and microstructure of Al2O3–YSZ composites

The relationship between microstructure and fracture toughness of zirconia toughened alumina (ZTA) added with MgO and CeO2

“…The Vickers hardness increased from 14.51 GPa to 14.99 GPa with the addition of 1.0 wt.% CeO 2 , while the fracture toughness increased to 6.59 ± 0.23 MPa · √m with 1.0 wt.% CeO 2 addition. However, the presence of CeAl 11 O 18 reduced the Vickers hardness and fracture toughness of the overall ceramics, which is in agreement with observations made by Akin et al [22]. …”

“…The formation of CeAl 11 O 18 promotes bonding between Al 2 O 3 and CeO 2 , which also has a contributing effect on the mechanical properties of the composite. Moreover, CeO 2 exhibits sensitivity to the sintering atmosphere and can form nonstoichiometric oxides such as Ce 2 O 3 when sintering at low oxygen pressure atmosphere [22]. As shown in Fig.…”

Effects of TiO2 addition on the phase, mechanical properties, and microstructure of zirconia-toughened alumina ceramic composite

“…For the ZTA -7 wt % TiO 2 sample however, the crack propagation encountered a higher number of crack deflection. Crack deflections are known to strengthen ceramic composites [23][24][25][26][27]. The increase in the fracture toughness from 5.93 MPa.¥m (0 wt% TiO 2 ) to 6.64 MPa.¥m (7 wt% TiO 2 ) could be explained by the mainly intergranular propagation path.…”

Investigation of the microstructure, mechanical properties and cell viability of zirconia-toughened alumina composites reinforced with carbon nanotubes

“…The densification behavior of Al 2 O 3 and Al 2 O 3 YSZ binary composites have been reported in our previous studies. 16),23) Briefly, the addition of 10 vol % YSZ increased the starting and completion temperatures of pure Al 2 O 3 due to the higher melting temperature of YSZ. Further addition of YSZ resulted in the formation of fine grained microstructure and enhanced sintering by reducing the onset and final temperatures of shrinkage.…”

“…This is due to their high hardness (³23 GPa), high Young's modulus (³400 GPa), biocompatibility, high wear and chemical resistance, and moderate flexure strength (³595 MPa). 16) 18) However, failure of the alumina components (with time in service) can originate from the slow crack growth characteristic of alumina. 19),20) The incorporation of zirconia into alumina ceramics results in zirconia-toughened alumina (ZTA) ceramics.…”