title: Sol-gel derived porous hydroxyapatite coatings.
abstract: The preparation of hydroxyapatite coatings on alumina substrates by a sol-gel method was investigated. A mixed ethanol solution of Ca(NO3)2.4H2O and P2O5 was used as a dipping source. The samples were characterized by solid-state 31P nuclear magnetic resonance spectroscopy, differential thermal analysis, thermogravimetry, X-ray diffraction, scanning electron microscopy and infrared reflection spectroscopy. The coating obtained at 500 degrees C had good hydroxyapatite crystallinity, adhesive strength of about 10 MPa and dense morphology. The coating obtained at 750 degrees C also had good crystallinity and adhesive strength but porous morphology.
authors.affiliation: Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China.
authors.forename: W
authors.initials: W
authors.lastname: Weng
authors.forename: J L
authors.initials: JL
authors.lastname: Baptista