Volume 29, Number 1 (Jun 2010)                   jame 2010, 29(1): 31-43 | Back to browse issues page


XML Persian Abstract Print


Download citation:
BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks
Send citation to:

S. Salehi, M. H. Fathi, K. Raeissi. Fabrication and characterization of nanostructured hydroxyapatite (HA)/ yttria stabilized zirconia (YSZ) composite coatings with various contents of yttria. jame. 2010; 29 (1) :31-43
URL: http://jame.iut.ac.ir/article-1-509-en.html

Biomaterials Group, Department of Materials Engineering, Isfahan University of Technology, Isfahan
Abstract:   (2096 Views)
The addition of ZrO2 particles to the HA coating has received considerable attention because ZrO2 particles increase the bonding strength between HA coating and substrate. In this study, nanostructured hydroxyapatite (HA)/yttria stabilized zirconia (YSZ) coatings were prepared by a sol–gel method. It was found that at 950ºC, the dominant phases were HA and tetragonal (t)-zirconia in 3YSZ, cubic (c)-zirconia in 8 YSZ and t-c-Zirconia in 5YSZ phases with the small amounts of β-tricalcium phosphate (β-TCP) and CaZrO3. The crystallite size of the coating was about ~20-30 nm for tetragonal and cubic zirconia grain size and 40-80 nm for hydroxyapatite grain size. Crack-free and homogeneous HA/YSZ composite coatings were obtained with no observable defects. In vitro evaluation in 0.9% NaCl showed that Ca2+ dissolution rate of composite coatings was lower than that of pure HA coatings. The decrease in electrochemical performance of these coated samples in comparison with the uncoated type 316L St.St could be associated with chloride ion and water penetration into the coating, transport of ions through the coating, and the subsequent electrochemical reactions at the coating–metal interface.
Full-Text [PDF 987 kb]   (641 Downloads)    
Type of Study: Research | Subject: General
Received: 2015/02/9 | Accepted: 2015/05/5 | Published: 2015/05/5

Add your comments about this article : Your username or email:
Write the security code in the box

Send email to the article author


© 2015 All Rights Reserved | Journal of Advanced Materials in Engineering (Esteghlal)

Designed & Developed by : Yektaweb

تحت نظارت وف بومی آسپا-وف