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      저자 : Kechao Zhou (검색결과 2 건)
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        Preparation of a Hydroxyapatite/β calcium phosphate coating with high bonding strength on a titanium substrate

        Fang Liu,Kechao Zhou,Zhiyou Li 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.5

        Hydroxyapatite/β-calcium phosphate coatings with a high bonding strength on titanium substrates were prepared by electrodeposited-hydrothermal synthesis and calcination. The phase composition, microstructure and bonding strength of the coatings were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and mechanical testing. It showed that electro-deposition coating phase mainly consisted of dicalcium phosphate dehydrate and hydroxyapatite. A single hydroxyapatite phase coating was obtained after a hydrothermal treatment for four hours in a solution of ammonia with a pH value above 12. After calcination below 700 oC, the phase composition of the coating remained the single hydroxyapatite phase. Then the β calcium phosphate phase appeared when the calcination temperature was above 800 oC. The quantity of β calcium phosphate could be controlled by adjusting the calcination parameters. For the specimens not pre-treated, calcination in air was beneficial to improve the bonding strength below 700 oC. Above 800 oC, the bonding strength decreased obviously because of the appearance of a loose and thick titanium nitride and titanium dioxide transition layer. The highest bonding strength in this study was obtained on the specimens pre-treated in a sodium hydroxide solution and calcined in an argon atmosphere at 900 oC.

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        Ordered porous TiO2 films obtained by freezing and the application in dye sensitized solar cells

        Xingxing Wang,Bingchu Yang,Kechao Zhou,Dou Zhang,Zhiyou Li,Conghua Zhou 한국물리학회 2015 Current Applied Physics Vol.15 No.5

        TiO2 films with ordered porous structure were prepared by freezing. By simply freezing wet TiO2 film on a cold copper plate, ice crystals could grow from bottom of film. Removing such ice crystals then led to ordered, micro-sized pores in the films. With assistance of scanning electron microscopy and N2 adsorptionedesorption isotherms, micro-structural properties of the films were studied. Coarsening behavior of ice crystals was analyzed based on evolvement of the micro-structure. It was found that, both larger film thickness and longer freezing time were beneficial for the formation of ordered porous structure, which was caused by enhanced ice crystals growth. The films were then used to fabricate photoanode of dye sensitized solar cells, of which the photo-to-electric power conversion efficiency was evaluated. It was observed that, solar cell made of ordered porous TiO2 film came out with 13% larger photo-current density comparing to that made of conventional doctor blading method, which is due to the enhanced light scattering by the ordered porous structure.

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