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Bond strength, compositional, and structural properties of hydroxyapatite coating on Ti, ZrO2-coated Ti, and TPS-coated Ti substrate

✍ Scribed by Yang, Yunzhi ;Ong, Joo L.

Publisher
John Wiley and Sons
Year
2003
Tongue
English
Weight
313 KB
Volume
64A
Category
Article
ISSN
0021-9304

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✦ Synopsis

Abstract

The effect of titanium plasma‐sprayed (TPS) and zirconia (ZrO~2~)‐coated titanium (Ti) substrates on the adhesive, compositional, and structural properties of plasma‐sprayed hydroxyapatite (HA) coatings were evaluated. X‐ray diffraction, Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy, energy dispersive spectroscopy, surface roughness, and adhesive strength were used to characterize the coatings. Apatite‐type and α‐tricalcium phosphate phases were observed for all HA coatings. A structural change due to the absence of a 960 cm^−1^ peak during FTIR analysis was observed for all HA coatings. The coating surfaces appeared rough and melted, with surface roughness correlating to the size of the starting powder. No significant difference in the Ca/P ratio of HA on Ti and TPS‐coated Ti substrates was observed. However, the Ca/P ratio of HA on ZrO~2~‐coated Ti substrate was significantly increased. Interfaces between all coatings and substrates were observed to be dense and tightly bound, except for HA coatings on TPS‐coated Ti substrate interface. However, an intermediate TPS or ZrO~2~ layer between the HA and Ti substrate resulted in a lower adhesive strength as compared to HA on Ti substrate. © 2003 Wiley Periodicals, Inc. J Biomed Mater Res 64A: 509–516, 2003

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