Microstructure of nanocrystalline TiO2 films produced by electrophoretic deposition on Ti–6Al–7Nb alloy

Abstract Nanocrystalline TiO 2 powders were electrophoretically deposited on the surface of Ti–6Al–7Nb alloy substrate. Post heat treatment at 850 °C was performed to improve the adhesion strength of the coating. The microstructure of the coating and substrate has been examined by light microscopy, scanning electron microscopy, analytical TEM methods (SAED, EDS) and X-ray diffraction. TEM investigations of cross-section thin foils allowed for detailed analysis of the coating microstructure. The TiO 2 film exhibited a nanocrystalline structure. SAED and XRD analyses show that the as-deposited nanocrystalline TiO 2 films exhibited anatase and rutile phase. The micromechanical properties (microhardness, Young's modulus) were measured. The results obtained show that TiO 2 films have low hardness and Young's modulus. During scratch tests any flaking or fracture was observed.

[1]  G. Rao,et al.  Preparation and phase transformation of anatase–rutile crystals in metal doped TiO2/muscovite nanocomposites , 2005 .

[2]  R. Mane,et al.  Unprecedented coloration of rutile titanium dioxide nanocrystalline thin films. , 2007, Micron.

[3]  Lech Pawlowski,et al.  MICROSTRUCTURAL CHARACTERIZATION OF PLASMA SPRAYED TIO2 FUNCTIONAL COATING WITH GRADIENT OF CRYSTAL GRAIN SIZE , 2006 .

[4]  Tadashi Kokubo,et al.  Structural dependence of apatite formation on titania gels in a simulated body fluid. , 2003, Journal of biomedical materials research. Part A.

[5]  F. Gennari,et al.  Enhancing Effect of Iron Chlorides on the Anatase‐Rutile Transition in Titanium Dioxide , 1999 .

[6]  Y. C. Feng,et al.  Characterization of elecrophoretically deposited nanocrystalline titanium dioxide films , 2006 .

[7]  A. Boccaccini,et al.  TiO2 coatings on silicon carbide and carbon fibre substrates by electrophoretic deposition , 2004 .

[8]  Liang Hong,et al.  Sol gel derived photocatalytic porous TiO2 thin films , 2005 .

[9]  P. Bouvier,et al.  Hot compaction of nanocrystalline TiO2 (anatase) ceramics. Mechanisms of densification: Grain size and doping effects , 2006 .

[10]  Aldo R. Boccaccini,et al.  Application of electrophoretic and electrolytic deposition techniques in ceramics processing , 2002 .

[11]  A. Boccaccini,et al.  Electrophoretic deposition of ceramic coatings on ceramic composite substrates , 2003 .

[12]  Kee-Rong Wu,et al.  Successive deposition of layered titanium oxide/indium tin oxide films on unheated substrates by twin direct current magnetron sputtering , 2006 .

[13]  Marcus Textor,et al.  Titanium in Medicine : material science, surface science, engineering, biological responses and medical applications , 2001 .

[14]  H. Liao,et al.  Microstructure and electrical properties of plasma sprayed porous TiO2 coatings containing anatase , 2004 .