Chapter 1 Zirconia-toughened Alumina for ... - Doc'INSA

The alloy Cobalt Chrome (CoCr) may be used as the solvent metal which acts similarly to Co metal. However, it differs in that the CoCr reacts with some of the dissolved carbon resulting in the precipitation of CoCr carbides. These carbides, like most carbides, are harder (abrasion resistant) than cobalt metal and results in a more wear. But bearings made of ceramics  -alumina ] and zirconia  have been shown to possess extremely low wear properties that make them suitable for both THA (total hip arthroplasty  ) and TKA(total knee arthroplasty ). When compared to the most commonly used bearing couple in joint arthroplasty, which consists of cobalt-chrome (CoCr) metal alloy articulating against UHMWPE[ ultrahigh-molecular-weight Poleethylene)offer significant reductions in bearing wear rates.

 The predicted stresses of the worst case at 30°flexion in combination with 2.0 mm cement layer thickness were below one quarter of the flexural strength of Zirconia Toughened Alumina (ZTA) ceramic (450 MPa).

 The following reference , I hope , will answer to most of your queries

PASTE/ CLICK:

 Ideal amount of zta to be mixed with Co-Cr alloy

 REACH/ CLiCK:

docinsa.insa-lyon.fr/these/2010/naglieri/06_chapter_1.pdf

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and screws), to improve function (cardiac pacemaker, contact lens) or correct ... Steady growth in the number of joint replacements is observed since the '70s, and .... First, the metal alloys, such as Co-Cr alloys, or stainless steel, are used for femoral ..... consisting in the combined effects of high stress at the crack tip, and the ...

 Chapter-I Zirconia -toughened Alumina for biomedical applications

1.1. Ceramics for  biomedical applicationa

 Especially look in:

 page 12- (Starting from  Alumina- Zirconia Composites) to page13 table-II)]

Thanks for your answer.