Development and characterization of zirconia-alumina composites for orthopedic implants
authors Sequeira, S; Fernandes, MH; Neves, N; Almeida, MM
nationality International
journal CERAMICS INTERNATIONAL
author keywords ZrO2; Y2O3 stabilized ZrO2; Al2O3; Biomedical applications
keywords LOW-TEMPERATURE DEGRADATION; MECHANICAL-PROPERTIES; IN-VITRO; CERAMICS; 3Y-TZP; MICROSTRUCTURE; TRANSFORMATION; BIOMATERIAL; GRANULES; POWDERS
abstract In this study, three different grades of alumina toughened zirconia composites (ATZ) (from 80 to 90 wt% of zirconia), and three grades of zirconia toughened alumina (ZTA) from 80 to 90 wt% of alumina were developed. Two types of stabilized zirconia were used: 3 mol% yttria stabilized zirconia used on the ATZ, and 2 mol% yttria stabilized zirconia for the ZTA. The composite powders were obtained by spray-drying with a controlled granulometric distribution. Uniaxial and cold isostatic pressing were performed. High density ceramics with densification above 97% were obtained after a low temperature sintering (1400 degrees C) leading to enhanced mechanical properties. Higher values of fracture toughness and flexural strength were achieved for the ATZ samples (up to 5 MPa m(1/2) and 1394 MPa respectively), while ZTA samples presented higher values of hardness (up to 1846 HV). Aging tests showed that ZTA samples did not present monoclinic zirconia after 96 h. MTT and alkaline phosphatase activity assays were performed on the sintered samples. This study shows that ATZ and ZTA composites with good mechanical properties, aging resistance and osteoblastic cytocompatibility can be attained.
publisher ELSEVIER SCI LTD
issn 0272-8842
isbn 1873-3956
year published 2017
volume 43
issue 1
beginning page 693
ending page 703
digital object identifier (doi) 10.1016/j.ceramint.2016.09.216
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000390624600098
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journal analysis (jcr 2017):
journal impact factor 3.057
5 year journal impact factor 2.882
category normalized journal impact factor percentile 94.444
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