Abstract
Abstract Hydroxyapatite coatings were fabricated by a room temperature spray method on zirconia substratesand the influence of heat-treatment on their microstructure was also investigated. Phase composition of coatedhydroxyapatite films was similar to the starting powder, but the grain size of hydroxyapatite particles was reducedto the size of nano-scale about 100 nm. Grain size, particle compactness, and adhesiveness to zirconia ofhydroxyapatite coatings were increased with heat-treatment temperature, but some of cracks by heat-treatmentabove 1100 o C were initiated between hydroxyapatite coatings and zirconia substrate. Heat-treated hydroxyapa-tite layers show the dissolution in SBF solution for 5 days. Hydroxyapatite-coated specimen heat-treated at1100 o C for 1 h has a good biocompatibility, which specimen induced the nanocrystalline hydroxyapatite precipi-tates on the coating surface by the immersion in SBF solution for 5 days. (Received December 26, 2014; Revised December 31, 2014; Accepted January 6, 2015)Key words : Hydroxyapatite coating, Room temperature spray, Zirconia, Heat-treatment
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