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Preparation and Properties of Fluor-hydroxyapatite Coating on Pure Titanium by Sol-Gel

Author: WangSanJun
Tutor: YangSen
School: Inner Mongolia University of Technology
Course: Materials Processing Engineering
Keywords: Pure titanium Sol - gel FHA Laser gas nitriding Bonding strength
CLC: TG174.4
Type: Master's thesis
Year: 2009
Downloads: 64
Quote: 0
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Abstract


Bio - active coating was prepared in the metal surface of the implant , can be a good biological activity of bioceramics , biocompatible metal , high strength and good toughness together. Coating interfacial bonding the low crystallinity defects will lead to the dissolution of the coating surface after implantation and the shedding of the coating , causing implantation failure . In this study, the use of the laser gas nitriding technology using the sol - gel method in the preparation of pure titanium and laser gas nitriding surface of pure titanium FHA bioactive coating on titanium surface preparation TiN dendrite surface . OM, SEM, EDS and XRD were used to study the crystallization temperature and cited fluorine content , the phase composition of the coating surface morphology , microstructure , and interfacial bonding strength of the coating and the substrate was tested . The following conclusions: the use of the laser gas nitriding can achieve surface modification of pure titanium , the modified layer tissue mainly composed of TiN dendrite . Laser gas nitriding the a titanium abrasion and corrosion resistance can be significantly improved . After 600 ° C , 700 ° C and 800 ℃ formed after the crystallization treatment FHA coatings were developed in a good apatite phase, but also with increasing the crystallization temperature , the coating formed in the diffraction peak intensity of the apatite getting stronger, but the high crystallization temperature causes the base part of the oxidation, which led to the emergence of the coating TiO2 phase . The thickness of the coating layer with increasing crystallization temperature and gradually thickening. The introduction of fluorine is conducive to raise the degree of crystallinity of the hydroxyapatite . FHA coating actual Ca / P value close to the theoretical value of the Ca / P formulated in the sol . The coating morphology and the fluorine content of the solution associated with the cited fluorine content increases, so that the difference becomes smaller coefficient of thermal expansion of the coating and the substrate , the coating crack tapers becomes less . TiN dendrite of the surface of the specimen of the laser gas nitriding FHA coating provides additional surface area , while infiltration coating dendrite coating has a \The bonding strength of the substrate and FHA laser gas nitriding polished substrate is about 2 times . With the cited increase in the amount of fluorine , the bonding strength of the coating and the substrate is gradually enhanced . The fluorine-containing coating has good stability and biological activity .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Corrosion control and protection > Metal surface protection technology
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