Abstract：
:The aim of the present study was to investigate the production of tetragonal zirconia (t-ZrO(2)) particles (experimental t-ZrO(2)) from monoclinic zirconia (m-ZrO(2)) and to evaluate the effect of the t-ZrO(2) content on the fracture toughness of alumina-zirconia composites by conducting ASTM E399 standard test. In the laboratory study, t-ZrO(2) powder was produced by heat treating m-ZrO(2) containing 10wt.% MgO. Alumina and alumina-zirconia composite powders containing various types and amounts of m-ZrO(2) and t-ZrO(2) were prepared (0-20 wt.%), shaped by slip casting to achieve a uniform distribution and homogeneous microstructure in accordance with the dimensions of ASTM E399 standards, dried, sintered at three different temperatures: 1400, 1500 and 1600 °C for two hours, and characterized. The results of the XRD analysis showed that t-ZrO(2) was produced at 1400 °C. In t-ZrO(2)-doped alumina composites, t-ZrO(2) partially transformed to m-ZrO(2) after sintering, whereas commercial t-ZrO(2) (Tosoh TZ-3Y) remained intact. SEM studies on samples sintered at 1600 °C revealed that the addition of zirconia inhibited abnormal grain growth of alumina, leading to a homogeneous and equiaxed grain structure, especially at high concentrations of zirconia. ZrO(2)-doping enhanced the fracture toughness of the composites, which increased with an increase in the t-ZrO(2) content. The maximum fracture toughness was 11.5 MPam(1/2) and was observed when the t-ZrO(2) content was equal to 20 wt.%. Alternatively, the maximum fracture toughness for pure alumina was 5.9 MPam(1/2).
journal_name
J Mech Behav Biomed Materauthors
Abi CB,Emrullahoğlu OF,Said Gdoi
10.1016/j.jmbbm.2012.11.007subject
Has Abstractpub_date
2013-02-01 00:00:00pages
123-31eissn
1751-6161issn
1878-0180pii
S1751-6161(12)00319-0journal_volume
18pub_type
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