Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/27979
Title: Preparation of titania-hydroxyapatite coating on NiTi via a low-temperature route
Authors: Shi, P
Geng, F
Cheng, FT
Issue Date: 2006
Source: Materials letters, 2006, v. 60, no. 16, p. 1996-1999
Abstract: A low-temperature route consisting of four simple steps was employed in preparing a titania-hydroxyapatite coating on NiTi. NiTi was first treated with hydrogen peroxide to form a thick titania gel, which was then partially transformed to a titanate hydrogel by alkali hydrothermal treatment. The hydrogel was subsequently soaked in a solution containing calcium and dihydrogen phosphate ions to form a dicalcium phosphate dihydrate (DCPD, CaHPO 4·2H 2O) coating containing some β-tricalcium phosphate (β-TCP, β-Ca 3(PO 4) 2). Finally, the DCPD and β-TCP were partly or totally transformed to hydroxyapatite (HA, Ca 10(PO 4) 6(OH) 2) by NaOH treatment. EDS analysis showed an overall Ca/P ratio of 1.55 for the final calcium phosphate coating, while XRD analysis revealed that the calcium phosphate coating was biphasic, being composed of HA (Ca/P = 1.67) together with some untransformed DCPD (Ca/P = 1.0).
Keywords: Calcium phosphate
Chemical method
Hydrogen peroxide
Hydrothermal
Hydroxyapatite
Titania
Publisher: Elsevier
Journal: Materials letters 
ISSN: 0167-577X
EISSN: 1873-4979
DOI: 10.1016/j.matlet.2005.12.066
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