title: The effect of NaOH concentration on the steam-hydrothermally treated bioactive microarc oxidation coatings containing Ca, P, Si and Na on pure Ti surface.
abstract: The microarc oxidation (MAO) coating covered pure Ti plates are steam-hydrothermally treated in autoclaves containing NaOH solutions with different concentrations of 0, 0.001, 0.01, 0.1 and 1mol·L(-1). Due to the composition of Ti, O, Ca, P, Si and Na elements in the MAO coating, anatase and hydroxyapatite (HA) crystals are generated from the previously amorphous MAO coating after the steam-hydrothermal treatment. Meanwhile, it is noticed that the amount of HA crystals increases but showing a decline trend in aspect ratio in morphologies with the increasing of NaOH concentration. Interestingly, the steam-hydrothermally treated MAO coatings exhibit better bonding strength with Ti substrate (up to 43.8±1.1MPa) than that of the untreated one (20.1±3.1MPa). In addition, benefiting from the corrosive attack of the dissolved NaOH in water vapor on the MAO coating, Ti-OH is also formed on the steam-hydrothermally treated MAO coating surface, which can trigger apatite nucleation. Thus, the steam-hydrothermally treated MAO coatings exhibit good apatite-inducing ability.
authors: Department of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China.
authors: Rui
authors: R
authors: Zhou
authors: Department of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China. Electronic address: daqingwei@hit.edu.cn.
authors: Daqing
authors: D
authors: Wei
authors: Department of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China.
authors: Jianyun
authors: J
authors: Cao
authors: Department of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China.
authors: Wei
authors: W
authors: Feng
authors: Department of Mechanical Engineering, School of Architecture and Civil Engineering, Harbin University of Science and Technology, Harbin 150001, PR China.
authors: Su
authors: S
authors: Cheng
authors: Department of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China.
authors: Qing
authors: Q
authors: Du
authors: Department of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China.
authors: Baoqiang
authors: B
authors: Li
authors: Department of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China.
authors: Yaming
authors: Y
authors: Wang
authors: Department of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China.
authors: Dechang
authors: D
authors: Jia
authors: Department of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China.
authors: Yu
authors: Y
authors: Zhou
mesh_terms: D001031:Apatites / Q000737:chemistry; D002118:Calcium / Q000737:chemistry*; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D017886:Durapatite / Q000737:chemistry; D010084:Oxidation-Reduction; D010758:Phosphorus / Q000737:chemistry*; D012825:Silicon / Q000737:chemistry*; D012964:Sodium / Q000737:chemistry*; D012972:Sodium Hydroxide / Q000737:chemistry*; D013227:Steam; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*
chemical_list: D001031:Apatites; D020099:Coated Materials, Biocompatible; D013227:Steam; C009495:titanium dioxide; D010758:Phosphorus; D012972:Sodium Hydroxide; D017886:Durapatite; D012964:Sodium; D014025:Titanium; D002118:Calcium; D012825:Silicon
keywords: Apatite-inducing ability; Fracture surface; Mechanical properties; Microarc oxidation; Steam-hydrothermal treatment