Journal
SURFACE & COATINGS TECHNOLOGY
Volume 204, Issue 21-22, Pages 3387-3392Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2010.03.058
Keywords
Hydroxyapatite; Aluminium oxide; Electrophoretic deposition; Reaction bonding; Sintering; Coatings
Funding
- Natural Science Foundation of China [20573086]
- National Basic Research Program of China [2007CB935603]
- National Key Technology R&D Program of China [2007BAE05B04]
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The major difficulty in fabricating hydroxyapatite (HA) coating on titanium substrate using the electrophoretic deposition (EPD) process is the full densification and crack prevention of the coating under the restricted sintering temperature. In this work, a combination of electrophoretic deposition and reaction bonding process was developed for the fabrication of HA/alumina (Al2O3) composite coating and HA functionally gradient coating (FGC) on titanium substrates at a relatively low sintering temperature of 850 degrees C. The results showed that the reaction bonding process enhances the coating's densification. The HA FGC with a thickness of about 40 mu m was crack-free and exhibited obvious gradient variation in chemical composition and microstructure. The HA FGC also exhibited much higher bonding strength than HA coating with the same thickness. (C) 2010 Elsevier B.V. All rights reserved.
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