STUDY OF PREPARATION AND CHARACTERIZATION OF HYDROXYAPATITE COATINGS BY SOL-GEL TECHNIQUE

Sutapa Roy Ramanan (School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, Kampus Kejuruteraan, Malaysia)
Ramanan Venkatesh (School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, Kampus Kejuruteraan, Malaysia)

ASEAN Journal on Science and Technology for Development
Vol. 19 No. 1 (2002): ASEAN Journal on Science and Technology for Development (AJSTD)

Hydroxyapåtite (HAP) coatings were prepared on glass substrates by sol-gel dip coating method, using a isopropanol solution of calcium nitrate and 2-butanol solution of phosphorous pentoxide as starting precursors and mixing them to get a coating solution with Ca/P ratio of 1.67. The prepared coatings were dried at 150°C and subsequently  fired at 500°C to obtain dense coatings. Multilayer coatings were prepared to increase the final thickness. For some samples, SiO2, TiO2, Al2O, and Zr02 coatings modified the interface between the glass and HAP. X-ray diffraction, scanning electron microscopy, FTIR and DTA/TG were used for characterization. All the coatings obtained at 500°C in air had only crystalline hydroxyapatite phase, characteristics FTIR signature peaks of HAP and dense and smooth morphology with the apparent presence of micropores. The cross-sectional microstructure of the coatings showed presence of smooth interface.