Tetragonal Zirconia Polycrystals TZP

Ce-TZP [211] and Ce-Y-TZP [212] exhibit martensitic transformation-associated shape memory. For example, the 8Ce-0.50Y-TZP exhibits a complete shape memory recovery under a recoverable strain of 1.2% at a relatively high 

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Tetragonal zirconia polycrystals (TZPs). These ceramics contain 100 percent tetragonal phase and small amounts of yttria and other rare-earth additives. With bend strength exceeding 2000 MPa, these ceramics are among the strongest known. 

As a metal, zirconium is used in bone and muscle implant materials. The combination of mechanical properties and excellent biocompatibility makes tetragonal zirconia polycrystal (TZP) ceramics one of the best biomaterials for prosthetic joints. (Covacci et al. 1999). 

Fig. 51. (a) Temperature-pressure phase diagram of pure Zr02 [244] and (b) the zirconia-rich section of a Zr02-Y203 phase diagram [245]. Shaded areas indicate the ranges of compositions for partially stabilized zirconia (PSZ) and tetragonal zirconia polycrystals (TZP) [246]. 

Explain why tetragonal zirconia polycrystal (TZP) and Mg-partially stabilized zirconia (PSZ) ceramics have higher toughness than alumina ceramics. 

Partially stabilized zirconia (PSZ) and tetragonal zirconia polycrystals (TZP)... 

Bioceramic Applications The performance requirements of yttria-stabilized tetragonal zirconia polycrystal (TZP) to form biocompatible, strong components for use as hip, knee, and dental prostheses, and which demonstrate long-term resistance against aggressive body fluids and mechanical wear and tear, during a predicted lifetime of 15-20 years in the human body, include ... 

Figure 8.15 Schematic illustration of the transformation-toughening mechanism in tetragonal zirconia polycrystal (TZP) ceramics, as visualized by atomic force microscopy. (AFM images reproduced from Ref [13J] with kind permission of Wiley-Blackwell Publishing.)...

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