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  • 1
    Electronic Resource
    Electronic Resource
    Bioactivity, Wear and Corrosion Resistant Properties of Rare Earth/Calcium Phosphate Composite Coatings (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 1194-1197 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Rare earth/calcium phosphate composite coatings were fabricated on the surface of Ti-6Al-4Vby micro-arc oxidation (MAO) technique. The wear properties and corrosion resistant of rare earth/calcium phosphate composite coatings in the simulated body fluid (SBF) have been investigated and thebioactivity of the composite coatings were evaluated. The results show that the friction coefficient of thecomposite coatings in the SBF is only 0.15~0.18 and the anode polarization potential of the coating hasbeen obviously enhanced about 0.18V compared with that of coatings of calcium phosphate coatings. Sothe composite coatings have excellent wear and corrosion resistant properties. XRD analysis indicatesthat the composite coatings can induce hydroxyapatite to form on its surface after soaked in SBF for 9d,which shows that the composite coatings own good bioactivity
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.1194.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Bioactive and Stability of Calcium Phosphate-Polypyrrole Composite Coatings by Electrochemical Deposition (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 1198-1200 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This study examined the bioactive and stability of calcium phosphate- polypyrrole(ppy)composite coatings on titanium alloys by electrochemically deposition in simulated body fluid (SBF).Change of coatings mass and SBF pH during coatings soaked in SBF indicated that ppy reduces thedecomposition of coatings. The surface morphology of coatings characterized by SEM showed that thestability of composition coating was superior to that of single coating. XRD indicated that ppy inducesCO32- enter calcium phosphate coating, which showed that the composite coatings possess betterbioactive. Thus, this electrochemical deposition provides an effective method of ppy incorporation atphysiological temperature, which can offer excellent bioactive and stability of coatings, with a potentialfor sustained release of therapeutic agents as required for metallic implant fixation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.1198.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Study on Porous Titanium Biomedical Materials (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 1212-1214 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The bioactivity of porous titanium is poor. Alkali treatment and heat treatment were used inporous titanium to induce apatite biocoatings on the surface of porous titanium and improve thebioactivity of porous titanium. The results indicate that grass-blade fibre Na2TiO3 and amorphous rutileform on alkali and heat treatment samples and (102) plane Ti disappeared. Octacalcium phosphate (OCP)and Hydroxyapatite (HA) were found on the surface of samples in simulation body fluid (SBF) for 2w.The intensity of OCP and HA increased with time of samples in vivo increased. Ti-OH formed on thesurface of the gel was explained by the point of view of negative and positive ion exchange. Themechanism of formation of OCP and HA induced by Na2TiO3 and TiO2 gel was studied
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.1212.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Hydroxyapatite Graded Coatings Made through Subsonic Thermal Spraying (2003)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 423-425 (May 2003), p. 327-330 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/07/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.423-425.327.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Effects of Ingredients and Post-Heat Treatment on Phase Transformation and Structure of Bioactive Composite Coatings (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 280-283 (Feb. 2007), p. 1619-1622 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Bioactive composite coatings containing sub-layer and working-layer with differentingredients were prepared using subsonic thermal spraying technology and then heat-treated at 700°C for 1h. Two types of bioglasses, named BG1 and BG2, and Y2O3 were used as additives of the sublayer and working layer respectively. Phase transformation and structure changes of the coatings were investigatedwith XRD, DSC and SEM. Results showed that the phases of as-sprayed Ti/BG1 sub-layer were TiN, TiO2 (rutile and anatase), etc. Post-heat treatment changed the phase composition. TiN and anatase transformed into rutile and some new phases generated, which often enriched at pores and cracks. In the working-layer, part of nano-hydroxyapatite powders decomposed during coating preparation. Y2O3impaired the decomposition to some extent and BG2 enhanced greatly. Post-heat treatment increased the crystallinity of all coatings effectively. The analysis of TG-DSC showed that BG2 added in working-layer crystallized at 700°
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.280-283.1619.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Preparation and Characterization of the Porous Hydroxyapatite/Silk Fibroin Composite Scaffolds with Interconnected Ducts (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 1190-1193 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Porous hydroxyapatite (HA) bioceramic matrix with interconnected ducts was obtained using aporogen burnout technique at 1200°C. The HA/silk fibroin (SF) composite scaffolds were developed withthe SF sponges formed inside the pores and ducts of the bioceramics by first introducing HA/SF slurriesinto the pores and ducts followed by a freeze-drying process. Phase components and morphology ofmaterials were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM),respectively. Porosity was measured by Archimedean method. Compressive strength was also measured.The simulated body fluids (SBF) experiments were conducted to evaluate bioactivity. The results showthat hydroxyapatite is the main phase compositions after sintering at 1200°C. The porosity of compositescaffolds reaches 70%~80%. The sizes of pores and ducts of HA matrix range from 150μm to 400μm andthe pore sizes of SF sponges formed inside the macroporous structure of bioceramics are approximately100μm,a structure favorable for bone tissue in-growth. The compressive strength of the compositescaffolds is greatly improved in comparison with that of HA matrix. In the SBF tests, a layer of randomlyoriented apatite crystals form on the scaffold surface after sample immersion in SBF. The cell cultureexperiments show that the osteoblast cells are attached and proliferated on the surface of the compositescaffold, which suggest good bioactivity and cellular compatibility of the composite material
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.1190.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Study on the Subsonic Thermal Sprayed Ti/Bioglass Composite Coatings on Titanium Alloy (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 475-479 (Jan. 2005), p. 2427-2430 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Ti/bioglass composite coatings on titanium alloy were prepared by a subsonic thermal spraying technology. Mixtures of titanium and bioglass powders with different proportions were used as feedstock. The effect of soaking of bioglass on the bond strength of between coatings and substrate was discussed. The bond strength and residual stress were investigated. The morphology was observed using scanning electron microscopy (SEM). The results showed that TiO2, CaTi4(PO4)6, CaTiO3, NaTi2(PO4)3 formed during thermal spraying process and the residual stress in the coatings was in compressive state. After the coatings were heat-treated, soaking of bioglass made some particles achieve metallurgical bond. Furthermore, new bioglass was formed and the compressive stress was increased. The phenomenon of bioglass healing up the cracks in the heat-treated coatings was observed through SEM, which reduced the porosity of the interface layer resulting in the significant increase of the bond strength
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/09/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.475-479.2427.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Study on Tissue Engineering Scaffolds of Silk Fibroin-Chitosan/ Nano-Hydroxyapatite Composite (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 971-975 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The porous scaffolds of silk fibroin-chitosan /nano-hydroxyapatite (SF-CS / n-HA) werefabricated through the freeze- drying technique. Component, structure and morphology of scaffoldswere studied by infrared (IR), X-ray diffusion (XRD) and scanning electron microscope (SEM), andthe mechanical properties of the scaffolds were measured. The simulated body fluid (SBF)experiments were conducted to assess the bioactivity of the scaffolds. Results indicate that chemicalbinding is formed between HA and organics, the macropore diameter of the scaffolds varies from150 to 400μm. The porous scaffolds with interconnected pores possess a high porosity of 78%-91%and compressive strength of 0.26 -1.96MPa, which can be controlled by adjusting the concentrationof organic phases and prefreezing temperature. In the SBF tests, a layer of randomly orientedbone-like apatite crystals formed on the scaffold surface, which suggested that the compositematerial had good bioactivity. Studies suggest the feasibility of using SF-CS /n-HA compositescaffolds for bone tissue engineering
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.971.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Electrochemically Assisted Co-Precipitation of Electrically Conducting Polymer with Calcium Phosphate Coatings on Ti Alloys (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1632-1634 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Electrically conducting polymer containing calcium phosphate coating (ppy/brushite) wasmade on the Ti-6Al-4V surface by means of electrochemically assisted co-precipitation. This studyexamined the effects of the electrically conducting polymer on electrochemically assisted co-precipitationof ppy/ brushite onto titanium alloys. Electrochemically assisted co-precipitation of ppy/ brushite coatingsresulted in an increase in the thickness and adhesion of coatings compared to those of coatings of singlecalcium phosphate at the same deposition conditions. The surface morphology of coatings characterizedby SEM showed that the morphology of ppy/ brushite was superior to that of brushite. XRD indicated thatppy did not change the phase of brushite. Thus, this electrochemically assisted co-precipitation techniqueprovides an effective method of polypyrrole incorporation at physiological temperature, which can offerexcellent thickness, adhesion and structure of coatings, with a potential for sustained release oftherapeutic agents as required for metallic implant fixation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1632.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Simulation In Vitro of Subsonic Flame Sprayed Titanium/Biological Glass Composite Coating (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1696-1698 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: 20wt% bioactive glass was added to the pure titanium power by means of subsonic flamespraying. Soak test in vitro was performed with the sprayed samples after heat treatment, and thepolarization curve was determined. The result shows that pH of the solution varied during the 60 himmersion of the coating in the simulated body fluid. This related to the fact that TiO2.CaTi4O9.NaTiO2etc were dissolved and precipitated in the coating. With different immersion time, the coating weightincreased first, and then decreased. The self-corrosion potential and morphology of the coating wereinfluenced by different polarization corrosion rate. When the polarization corrosion rate was low, itcontributed to the growth of bone-like apatite, and then the corrosion was restrained. In simulated bodyfluid, absorption, dissolution, and the formation and growth of new phases took place in the coating.Bone-like apatite may form on the coating surface, which indicates the excellent biocompatibility of8Ti2G bio-composite coating
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1696.pdf
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