title: Formation and growth of calcium phosphate on the surface of oxidized Ti-29Nb-13Ta-4.6Zr alloy.
abstract: The bioconductivity of a new biomedical titanium alloy Ti-29Nb-13Ta-4.6Zr achieved by a combination of surface oxidation and alkali treatment is reported in this paper. Oxidation treatment at 400 degrees C for 24 h was found to result in the formation of a hard layer on the surface of the alloy. Immersion in a protein-free simulated body fluid and fast calcification solution led to the growth of calcium phosphate (Ca-P) phase on the oxidized and alkali-treated alloy, and the new bioconductive surface was still harder than the substrate. The surface processes during various treatment and immersion processes were investigated in detail, and the morphology of the calcium phosphate crystals was shown to be determined by the concentrations of Ca and P in the solution.
authors.affiliation: Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, PR China.
authors.forename: S J
authors.initials: SJ
authors.lastname: Li
authors.forename: R
authors.initials: R
authors.lastname: Yang
authors.forename: M
authors.initials: M
authors.lastname: Niinomi
authors.forename: Y L
authors.initials: YL
authors.lastname: Hao
authors.forename: Y Y
authors.initials: YY
authors.lastname: Cui
mesh_terms: D002130:Calcium Phosphates / Q000737:chemistry*; D011232:Chemical Precipitation; D008855:Microscopy, Electron, Scanning; D009556:Niobium / Q000737:chemistry*; D010084:Oxidation-Reduction; D013499:Surface Properties; D013635:Tantalum / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction; D015040:Zirconium / Q000737:chemistry*
chemical_list: D002130:Calcium Phosphates; C481486:Ti-29Nb-13Ta-4.6Zr alloy; C485828:alpha-tricalcium phosphate; C485830:tetracalcium phosphate; D009556:Niobium; D013635:Tantalum; C485838:calcium phosphate, monobasic, anhydrous; C020243:calcium phosphate; D015040:Zirconium; D014025:Titanium; C485829:calcium phosphate, dibasic, anhydrous