title: Influence of Starting Powders on Hydroxyapatite Coatings Fabricated by Room Temperature Spraying Method.
abstract: Three types of raw materials were used for the fabrication of hydroxyapatite coatings by using the room temperature spraying method and their influence on the microstructure and in vitro characteristics were investigated. Starting hydroxyapatite powders for coatings on titanium substrate were prepared by a heat treatment at 1100 °C for 2 h of bovine bone, bone ash, and commercial hydroxyapatite powders. The phase compositions and Ca/P ratios of the three hydroxyapatite coatings were similar to those of the raw materials without decomposition or formation of a new phase. All hydroxyapatite coatings showed a honeycomb structure, but their surface microstructures revealed different features in regards to surface morphology and roughness, based on the staring materials. All coatings consisted of nano-sized grains and had dense microstructure. Inferred from in vitro experiments in pure water, all coatings have a good dissolution-resistance and biostability in water.
authors.forename: Dong Seok
authors.initials: DS
authors.lastname: Seo
authors.forename: Jong Kook
authors.initials: JK
authors.lastname: Lee
authors.forename: Kyu Hong
authors.initials: KH
authors.lastname: Hwang
authors.forename: Byung Dong
authors.initials: BD
authors.lastname: Hahn
authors.forename: Seog Young
authors.initials: SY
authors.lastname: Yoon
mesh_terms: D000336:Aerosols / Q000737:chemistry* / Q000302:isolation & purification; D018786:Bone Substitutes / Q000032:analysis / Q000138:chemical synthesis; D020099:Coated Materials, Biocompatible / Q000032:analysis / Q000138:chemical synthesis*; D017886:Durapatite / Q000032:analysis / Q000737:chemistry*; D005740:Gases / Q000737:chemistry*; D008422:Materials Testing; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D011208:Powders; D013499:Surface Properties; D013696:Temperature
chemical_list: D000336:Aerosols; D018786:Bone Substitutes; D020099:Coated Materials, Biocompatible; D005740:Gases; D011208:Powders; D017886:Durapatite