Authors: Naoshi Ozawa, Yoshihiro Ideta, Keiko Shimizu, Takeshi Yao
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Authors: Seiji Yamaguchi, Takeshi Yao
Abstract: Alumina is excellent biomaterial and used in hip prostheses, dental implants and so on. Wollastonite particles were deposited in pores of porous alumina by electrophoretic deposition and an alumina-wollastonite composite was produced. Apatite was formed both inside the pores and on the surface of the composite of the alumina-wollastonite composite by soaking in a simulated body fluid. It was indicated that the deposited wollastonite particles induced the apatite formation. Novel
composite material with both excellent mechanical properties and high bioactivity was developed.
863
Authors: Seiji Yamaguchi, Takeshi Yabutsuka, Mitsuhiro Hibino, Takeshi Yao
Abstract: Apatite pattern was prepared by electrophoretic deposition (EPD) transcribing resist pattern. A porous polytetrafluoroethylene (PTFE) film was used as a substrate and attached on a cathode. The cathode for EPD was stainless plate with resist pattern. EPD was performed with a suspension of wollastonite particles in acetone and wollastonite particles were deposited on the substrate in the form of the resist pattern. When the wollastonite-deposited substrate was soaked in
simulated body fluid (SBF), apatite was induced and then replaced wollastonite at the wollastonite deposited region on the substrate. As a result, apatite was formed in the pattern that traced the resist pattern. The minimum line width of the apatite pattern was about 100 µm.
659
Authors: Gregorio Vargas, P. Mondragón, Georgina García-Ruiz, Hugo H. Rodríguez, Alejandra Chávez-Valdez, Dora A. Cortés-Hernández
Abstract: Hydroxyapatite, porcelain and wollastonite coatings on stainless steel 316L were
produced by electrophoretic deposition (EPD) in ethanol and acetone using a voltage between 200
and 1000 V during 0.5 to 60 s. The particle size distribution of the starting suspension was 0.3 to
4.9 microns with an average size of 1.5 microns. The coatings were analyzed using scanning
electron microscopy. The amount of ceramic material on the surface of the metallic samples was
evaluated by determining their difference in weight before and after the electrophoretic deposition
process. The conductivity and zeta potential of the dispersing media were also evaluated.
Dense, homogeneous and crack-free green coatings were obtained. The deposition rate was higher
by using acetone as dispersing media. The higher zeta potential and the lower viscosity were
attributed to be the cause of the better electrophoretic deposition of the acetone and methanol
ceramic suspensions. Submicron particle coatings were then sintered between 800 and 1000 C
during 2 h. The sintered coatings presented a very homogeneous polycrystalline structure free of
cracks. The results show that the application of high voltage during short periods of time is an
effective method to obtain ceramic coatings with good sinterability.
263
Authors: Araki Toriyama, Kenichi Myoujin, Takayuki Kodera, Takashi Ogihara
Abstract: La0.8Sr0.2Ga0.8Mg0.2O3-δ (LSGM) precursor particles were successfully prepared by ultrasonic spray pyrolysis. LSGM thin films were prepared by the electrophoretic deposition (EPD) technique using ethanol containing iodine. The LSGM films were obtained by sintering at 1300 °C for 10 h. The X-ray diffraction patterns revealed that the diffraction peak of LSGM thin films was in agreement with the perovskite structure. The LSGM films attained a uniform thickness of 10 μm.
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