Hydroxyapatite coating on porous zirconia
Miao, Xigeng, Hu, Y.Q. , Liu, Jianli , & Huang, Xiao (2007) Hydroxyapatite coating on porous zirconia. Materials Science and Engineering C : Biomimetic Materials, Sensors and Systems, 27(2), pp. 257-261.
Since hydroxyapatite has excellent biocompatibility and bone bonding ability, porous hydroxyapatite ceramics have been intensively studied. However, porous hydroxyapatite bodies are mechanically weak and brittle, which makes shaping and implantation difficult. One way to solve this problem is to introduce a strong porous network onto which hydroxyapatite coating is applied. In this study, porous zirconia and alumina-added zirconia ceramics were prepared by ceramic slurry infiltration of expanded polystyrene bead compacts, followed by firing at 1500 degrees Celsius. Then a slurry of hydroxyapatite-borosilicate glass mixed powder was used to coat the porous ceramics, followed by firing at 1200 degrees Celsius. The porous structures without the coating had high porosities of 51% to 69%, a high pore interconnectivity, and sufficiently large pore window sizes (300um–500um). The porous ceramics had compressive strengths of 5.3~36.8MPa and Young’s moduli of 0.30~2.25GPa, favorably comparable to the mechanical properties of cancellous bones. In addition, porous hydroxyapatite surface was formed on the top of the composite coating, whereas a borosilicate glass layer was found on the interface. Thus, porous zirconia-based ceramics were modified with a bioactive composite coating for biomedical applications.
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|Item Type:||Journal Article|
|Keywords:||Zirconia, porosity, hydroxyapatite, coating, compressive strength|
|Subjects:||Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > BIOMEDICAL ENGINEERING (090300) > Biomaterials (090301)|
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering|
Current > Institutes > Institute of Health and Biomedical Innovation
|Copyright Owner:||Copyright 2007 Elsevier|
|Copyright Statement:||Reproduced in accordance with the copyright policy of the publisher.|
|Deposited On:||29 Mar 2007|
|Last Modified:||29 Feb 2012 23:25|
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