HA/TiO 2 composite coating were fabricated via adding TiO 2 powder in the electrolyte by electrodeposition.The influence of current dens ity and deposition time on the content of TiO 2 in the coating,the influence of ...HA/TiO 2 composite coating were fabricated via adding TiO 2 powder in the electrolyte by electrodeposition.The influence of current dens ity and deposition time on the content of TiO 2 in the coating,the influence of the content of TiO 2 in the coating on the bonding strength of coating and the influence of sinte ring temperature on the structure and the bonding strength of coating were inves tigated.The experiment results show that the content of TiO 2 in the coating increase with reducing the current density and prolonging the deposition time,the bonding strength improve with increasing the content of TiO 2 in the coating,which can obtain18.7MPa when the weight percent TiO 2 in the coating attain72.2%.The addition of TiO 2 in the coating reduces the thermal expansion co - efficient of the coating,improves the bonding strength of coating and change s the fracture mechanism of the coat - ing from adhesion failure to cohesive failure.HA in the composite coatings i s decomposed by the catalysis reac - tion of TiO 2 at the temperature of sinter850 ℃ .Differential scanning calorimetry and X - ray diffractometry analy - ses showed that the chemical reaction between HA and TiO 2 lead to the product are α- TCP and CaTiO 3 at the temperature of sinter1200 ℃ .In order to prevent the coating from decomposing and attain hign bonding st rength,the sintering temperature should be less than820 ℃ .展开更多
采用脉冲电化学沉积法成功地在生物医用钛金属表面制备出均匀的纳米HA/ZrO2复合涂层.通过热处理提高涂层的致密性,同时保留涂层的微纳结构.考察了热处理后复合涂层的成分、形貌、生物相容性及生理稳定性.X射线衍射分析表明,复合涂层成分...采用脉冲电化学沉积法成功地在生物医用钛金属表面制备出均匀的纳米HA/ZrO2复合涂层.通过热处理提高涂层的致密性,同时保留涂层的微纳结构.考察了热处理后复合涂层的成分、形貌、生物相容性及生理稳定性.X射线衍射分析表明,复合涂层成分为HA和ZrO2.扫描电镜观察发现,热处理后复合涂层的致密性有所提高.研究发现,ZrO2的加入大大降低了HA/ZrO2复合涂层中钙离子的释放速度,提高了HA/ZrO2复合涂层的生理稳定性.纳米划痕实验结果表明,HA/ZrO2复合涂层具有较好的结合强度.通过培养成骨细胞考察了复合涂层的生物相容性.A lam ar B lue检测表明,HA/ZrO2复合涂层表面细胞黏附及增殖能力较好.ALP检测发现,热处理后HA/ZrO2复合涂层表面的细胞分化能力较强.综合细胞培养结果显示,HA/ZrO2复合涂层有较好的生物相容性.展开更多
The composite films consisting of hydroxyapatite (HAP) submicron particles embedded in the gel composed of the titania nanoparticles were prepared on commercial Ti6Al4V plates with titania buffer layer obtained by a s...The composite films consisting of hydroxyapatite (HAP) submicron particles embedded in the gel composed of the titania nanoparticles were prepared on commercial Ti6Al4V plates with titania buffer layer obtained by a spin-coating technique. The films were calcined in air at various temperatures, and the bioactivities of the films were investigated by immersing them in acellular simulated body fliud (SBF). X-ray diffraction(XRD), Fourier transform infrared spectroscopy (FTIR), Field emission-scanning electron microscopy(FESEM) and Energy dispersive X-ray (EDS) analysis were employed to investigate the phase formation and structure of the films before and after immersion, and the variations of Ca and P contents in SBF were measured by Inductively Coupled Plasma Spectroscopy(ICP). The results show that the as-prepared films were dense, homogeneous, all well-crystallized, and there was a close interfacial bond between the film and the substrate. The characterisatics of the grown layer on the surfaces of the HAP/TiO2 films after immersion in SBF for different periods of time are specially discussed.展开更多
文摘HA/TiO 2 composite coating were fabricated via adding TiO 2 powder in the electrolyte by electrodeposition.The influence of current dens ity and deposition time on the content of TiO 2 in the coating,the influence of the content of TiO 2 in the coating on the bonding strength of coating and the influence of sinte ring temperature on the structure and the bonding strength of coating were inves tigated.The experiment results show that the content of TiO 2 in the coating increase with reducing the current density and prolonging the deposition time,the bonding strength improve with increasing the content of TiO 2 in the coating,which can obtain18.7MPa when the weight percent TiO 2 in the coating attain72.2%.The addition of TiO 2 in the coating reduces the thermal expansion co - efficient of the coating,improves the bonding strength of coating and change s the fracture mechanism of the coat - ing from adhesion failure to cohesive failure.HA in the composite coatings i s decomposed by the catalysis reac - tion of TiO 2 at the temperature of sinter850 ℃ .Differential scanning calorimetry and X - ray diffractometry analy - ses showed that the chemical reaction between HA and TiO 2 lead to the product are α- TCP and CaTiO 3 at the temperature of sinter1200 ℃ .In order to prevent the coating from decomposing and attain hign bonding st rength,the sintering temperature should be less than820 ℃ .
文摘采用脉冲电化学沉积法成功地在生物医用钛金属表面制备出均匀的纳米HA/ZrO2复合涂层.通过热处理提高涂层的致密性,同时保留涂层的微纳结构.考察了热处理后复合涂层的成分、形貌、生物相容性及生理稳定性.X射线衍射分析表明,复合涂层成分为HA和ZrO2.扫描电镜观察发现,热处理后复合涂层的致密性有所提高.研究发现,ZrO2的加入大大降低了HA/ZrO2复合涂层中钙离子的释放速度,提高了HA/ZrO2复合涂层的生理稳定性.纳米划痕实验结果表明,HA/ZrO2复合涂层具有较好的结合强度.通过培养成骨细胞考察了复合涂层的生物相容性.A lam ar B lue检测表明,HA/ZrO2复合涂层表面细胞黏附及增殖能力较好.ALP检测发现,热处理后HA/ZrO2复合涂层表面的细胞分化能力较强.综合细胞培养结果显示,HA/ZrO2复合涂层有较好的生物相容性.
文摘The composite films consisting of hydroxyapatite (HAP) submicron particles embedded in the gel composed of the titania nanoparticles were prepared on commercial Ti6Al4V plates with titania buffer layer obtained by a spin-coating technique. The films were calcined in air at various temperatures, and the bioactivities of the films were investigated by immersing them in acellular simulated body fliud (SBF). X-ray diffraction(XRD), Fourier transform infrared spectroscopy (FTIR), Field emission-scanning electron microscopy(FESEM) and Energy dispersive X-ray (EDS) analysis were employed to investigate the phase formation and structure of the films before and after immersion, and the variations of Ca and P contents in SBF were measured by Inductively Coupled Plasma Spectroscopy(ICP). The results show that the as-prepared films were dense, homogeneous, all well-crystallized, and there was a close interfacial bond between the film and the substrate. The characterisatics of the grown layer on the surfaces of the HAP/TiO2 films after immersion in SBF for different periods of time are specially discussed.
