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Investigation into phase transformation of Yttria stabilized zirconia femoral heads
Dissertation (MEng)--University of Pretoria, 2010.
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University of Pretoria
2013
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| _version_ | 1867613625609355264 |
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| access_status_str | Open Access |
| author2 | Burger, N.D.L (Nicolaas Daniel Lombard) |
| author_browse | Burger, N.D.L (Nicolaas Daniel Lombard) |
| author_facet | Burger, N.D.L (Nicolaas Daniel Lombard) |
| collection | Thesis |
| dc_rights_str_mv | © 2010, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Dissertation (MEng)--University of Pretoria, 2010. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/26215 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:39:07.647Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2013 |
| publishDateRange | 2013 |
| publishDateSort | 2013 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/26215 Investigation into phase transformation of Yttria stabilized zirconia femoral heads Burger, N.D.L (Nicolaas Daniel Lombard) adrian.hohls@cmti.co.za Hohls, Adrian Christian Phase transformation Y-tzp Yttria stabilised tetragona zirconia Femoral heads UCTD Dissertation (MEng)--University of Pretoria, 2010. 27 Retrieved Yttria Stabilised Tetragonal Zirconia (Y-TZP) femoral heads were studied for the occurrence of tetragonal to monoclinic phase transformation and the effects that such transformation has on the bearing surface. The mean monoclinic percentage found is 53.6% with 25 of the samples having transformed more than 20%. This finding nullifies earlier predictions that it would take 25 to 30 years to transform to a monoclinic content of 30 to 40% inside the human body (Chevalier, Drouin&Calés 1997). It was however shown that Hot Isostatic Pressed (HIP’ed) Y-TZP femoral heads have a better, though still not adequate, resistance to phase transformation in the human body than non-HIP’ed femoral heads. Results of various investigations show that this transformation degrades the surface condition of the femoral heads, which in turn increases wear and subsequently decreases the survival rate of the prosthesis due to a greater risk of aseptic loosening. It is postulated that a great contributing factor to the phase transformation is increased temperatures inside the bearing couple, due to inadequate lubrication between the two bearing surfaces. Tetragonal to monoclinic phase transformation and its associated effects renders Y-TZP femoral heads less attractive for hip replacements. Mechanical and Aeronautical Engineering unrestricted 2013-09-07T03:55:06Z 2011-07-14 2013-09-07T03:55:06Z 2011-04-06 2010 2011-07-11 Dissertation Hohls, AC 2010, Investigation into phase transformation of Yttria stabilized zirconia femoral heads, MEng dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://hdl.handle.net/2263/26215 > E11/320/gm http://hdl.handle.net/2263/26215 http://upetd.up.ac.za/thesis/available/etd-07112011-163318/ © 2010, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | Phase transformation Y-tzp Yttria stabilised tetragona zirconia Femoral heads UCTD Investigation into phase transformation of Yttria stabilized zirconia femoral heads |
| title | Investigation into phase transformation of Yttria stabilized zirconia femoral heads |
| title_full | Investigation into phase transformation of Yttria stabilized zirconia femoral heads |
| title_fullStr | Investigation into phase transformation of Yttria stabilized zirconia femoral heads |
| title_full_unstemmed | Investigation into phase transformation of Yttria stabilized zirconia femoral heads |
| title_short | Investigation into phase transformation of Yttria stabilized zirconia femoral heads |
| title_sort | investigation into phase transformation of yttria stabilized zirconia femoral heads |
| topic | Phase transformation Y-tzp Yttria stabilised tetragona zirconia Femoral heads UCTD |
| url | http://hdl.handle.net/2263/26215 http://upetd.up.ac.za/thesis/available/etd-07112011-163318/ |