Formation of bioceramic coatings containing hydroxyapatite on the titanium substrate by micro-arc oxidation coupled with electrophoretic deposition

Aluminium layers were coated onto the surface of pure titanium using hot-dip aluminising technology, and then the aluminium layers were in situ oxidised to form oxide ceramic coatings, using the micro-arc oxidation (MAO) technique. The microstructure and composition distribution of the hot-dip aluminium coatings and ceramic layers were studied by using scanning electron microscopy and energy-dispersive X-ray spectroscopy. The phase structure of the MAO layers was studied using X-ray diffraction. The surface composition of the MAO layer was studied by X-ray photoelectron spectroscopy. The wear resistance of the pure titanium substrate and the ceramic layers coated on its surface were evaluated by using the ball-on-disc wear method. Therefore, aluminising coatings, which consist of a diffusion layer and a pure aluminium layer, could be formed on pure titanium substrates using the hot-dip aluminising method. The MAO method enabled the in-situ oxidation of hot-dip pure aluminium layers, which subsequently led to the formation of ceramic layers. Moreover, the wear resistance values of the ceramic layers were significantly higher than that of the pure titanium substrate.

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Electrophoretic deposition of carbon nanotubes–hydroxyapatite nanocomposites on titanium substrate

Materials Science and Engineering C ◽

10.1016/j.msec.2010.05.007 ◽

2010 ◽

Vol 30 (7) ◽

pp. 1043-1049 ◽

Cited By ~ 59

Author(s):

Yu Bai ◽

Madhav Prasad Neupane ◽

Il Song Park ◽

Min Ho Lee ◽

Tae Sung Bae ◽

...

Keyword(s):

Carbon Nanotubes ◽

Electrophoretic Deposition ◽

Titanium Substrate

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ADVANCEMENT IN PREPARATION OF HYDROXYAPATITE/BIOGLASS GRADED COATINGS BY ELECTROPHORETIC DEPOSITION

Surface Review and Letters ◽

10.1142/s0218625x05007669 ◽

2005 ◽

Vol 12 (05n06) ◽

pp. 773-779 ◽

Cited By ~ 5

Author(s):

LIANG YAO ◽

CHUANZHONG CHEN ◽

DIANGANG WANG ◽

QUANHE BAO ◽

JIE MA

Keyword(s):

Influencing Factors ◽

Electrophoretic Deposition ◽

Deposition Time ◽

Complex Shape ◽

Good Method ◽

Processing Parameters ◽

Porous Surface ◽

Graded Coatings ◽

Dispersion Media ◽

Bioceramic Coatings

Electrophoretic deposition is a good method in the preparation of hydroxyapatite/bioglass graded coatings. Its processing parameters are easy to be operated. As it is nonbeeline process, it can be used in the deposition of complex shape and porous surface. This paper reviewed the advancement of the graded coatings in recent years, concluded the principles, characters, steps of electrophoretic deposition of bioceramic coatings and analyzed influencing factors in detail, such as granularity of suspension, aging of suspension, dispersion media, PH of suspension, electricity, voltage, deposition time, pretreatment of substrate and sintering. The foreground of hydroxyapatite/bioglass graded coatings is expected.

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Direct preparation of CaTi4 (PO4)6 coatings on the surface of titanium substrate by micro arc oxidation

Journal of Materials Science Materials in Medicine ◽

10.1007/s10856-007-3115-5 ◽

2007 ◽

Vol 18 (12) ◽

pp. 2275-2281 ◽

Cited By ~ 8

Author(s):

Zhongwei Zhao ◽

Shimei Wen

Keyword(s):

Titanium Substrate ◽

Micro Arc Oxidation ◽

Direct Preparation

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Development of Hydroxyapatite Thin Film on Titanium Substrate by Electrophoretic Deposition

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.284-286.901 ◽

2005 ◽

Vol 284-286 ◽

pp. 901-904 ◽

Cited By ~ 2

Author(s):

Chang Kuk You ◽

Xian Wei Meng ◽

Tae Yub Kwon ◽

Yu Zhong Yang ◽

J.L. Ong ◽

...

Keyword(s):

Electrophoretic Deposition ◽

Coating Thickness ◽

Applied Voltage ◽

Counter Electrode ◽

Coating Layer ◽

Sol Gel ◽

Titanium Substrate ◽

Powder Concentration ◽

Ha Coating ◽

Nano Size

Electrophoretic deposition was used for HA coating on dental implants with different coating thickness. The HA coating thickness was examined in terms of applied voltage and time, and powder concentration in suspension. Nano-size HA and SiO2-CaO-P2O5-B2O3 bioglass powders were synthesized by sol-gel method. Polyvinyl alcohol (3 wt%) as a binder was resolved in ethyl alcohol, then, nano HA powder was dispersed ultrasonically in the mixture for 15 min and pH was adjusted with HNO3 for positive charging on particle. Titanium substrate was held on cathode and counter electrode was platinum. HA with 0.5 % and 0.03 % of powder concentration was deposited electrophoretically at 10~20 V for 1~20 minutes. The thickness of as-deposited HA layer decreased from nearly 80 µm (0.5 %, 20 V, 10 min) to 4~5 µm (0.03%, 10V, 1 min) as powder concentration, applied voltage and time decreased, respectively. The surface of HA coating layer deposited in lower powder concentration showed much more homogeneous and relatively dense morphology, in contrast, the surface in thick suspension became rough or porous and was easily spalled. In a co-deposition of HA and bioglass, co-deposited glass played an important role in increasing bonding strength between coating layer and substrate. It is believed that electrophoretic deposition method can be one of alternatives for relatively thin and easy HA coating.

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