Hardness and Fracture Toughness of Alumina-Doped Tetragonal Zirconia with Different Yttria Contents

Abstract

The 0.75 to 3.0 mol% Y 2 O 3 -stabilized tetragonal ZrO 2 (Y-TZP) and Al 2 O 3 /Y-TZP fine-grained ceramics with 0.2 to 0.7 mass% of alumina were produced by a colloidal technique and low-temperature sintering. Trace alumina addition enhanced the densification of Y-TZP. The influence of the resulting density, microstructure, the yttria-stabilizer and the alumina content on the hardness and toughness were studied. The bulk 2.7Y-TZP ceramic with an average grain size of 110 nm reached a hardness of 13.6 GPa and fracture toughness of 11.2 MPaÁm 1=2 . Y-TZP ceramics with a reduced yttria-stabilizer content were found to reach a fracture toughness of 13.

Nanobioceramic Composites: A Study of Mechanical, Morphological, and Thermal Properties

“…Similar results were also reported by Vasylkiv et al (2003). This is also observed in case of the specific gravity (SG) analysis, which shows that the SG decreases as the CNF wt.% increases.…”

Field assisted sintering of graphene reinforced zirconia ceramics

“…Materials such as Y 2 O 3 , MgO, CeO 2 and SiC have been added as a second phase to prepare ZrO 2 -based composites with increased fracture toughness [5][6][7][8]. For example, Oleg Vasylkiv et al [9] used a colloidal technique at low-temperature to produce yttria-stabilized tetragonal zirconia (Y-TZP) and Al 2 O 3 /Y-TZP fine-grained ceramics. The 1.5 mol.% Y-TZP ceramics reached the maximum fracture toughness of 14.5 MPa Á m 1/2 .…”

Fracture Toughness of Yttria-Stabilized Cubic Zirconia (8Y-CSZ) Doped with Pure Silica

“…3,5) For an application to electrolytes, however, information is necessary on the fracture strength of silica doped Y-CSZ. This is because the solid electrolytes suffer thermal and external stresses and because the fracture strength of Y-CSZ is relatively low [6][7][8][9] owing to lack of the transformation toughening 10,11) that works in tetragonal zirconia. However, little information has been obtained on the fracture strength of silica-doped Y-CSZ.…”