title: Chemical gradient in plasma-sprayed HA coatings.
abstract: The microstructure and inhomogeneous features of plasma-sprayed hydroxyapatite coatings on titanium substrates have been examined using the time-of-flight secondary ion mass spectroscopy (ToF-SIMS), micro-Raman spectroscopy and nano-indentation techniques. The crystalline and amorphous areas in coatings can be identified by the elastic modulus difference. The concentration gradient of O and OH ions was detected in the through-thickness direction of coatings. Lack of O and OH ions near the titanium interface implies the existence of phases other than HA, and might result in excessive adsorption of the coatings near the interface in HA-coated Ti implants.
authors.affiliation: Engineering Center of Biomaterials Research, Sichuan University, Chengdu, People's Republic of China.
authors.forename: J
authors.initials: J
authors.lastname: Wen
authors.forename: Y
authors.initials: Y
authors.lastname: Leng
authors.forename: J
authors.initials: J
authors.lastname: Chen
authors.forename: C
authors.initials: C
authors.lastname: Zhang
mesh_terms: D000497:Alloys; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D003460:Crystallization; D017886:Durapatite / Q000737:chemistry*; D004548:Elasticity; D008422:Materials Testing; D014025:Titanium / Q000737:chemistry*
chemical_list: D000497:Alloys; D020099:Coated Materials, Biocompatible; C031462:titanium alloy (TiAl6V4); D017886:Durapatite; D014025:Titanium