电泳沉积法制备HA/Ti0，复合涂层

羟基磷灰石是一种最有发展前途的生物材料之一.采用电泳沉积方法在钛合金基体上制备了HA/TiO2生物陶瓷涂层.将HA和TiO2粉体分散到正丁醇溶液中,再加入三乙醇胺,通过zeta电位确定了稳定的悬浮液中三乙醇胺和HA/TiO2的含量.研究了沉积电压和电泳时间对HA/TiO2涂层形貌和沉积量的影响.制得均匀致密涂层的适宜电压范围为250～350V.研究结果表明:由于电场强度随沉积时间改变,HA/TiO2沉积量随着沉积时间的增加表现出2段沉积速率不同的线性增长.     

水热电化学沉积HA/TiO_2复合涂层物相及性能

采用水热电化学沉积法制备HA/TiO2复合涂层,研究电解液中TiO2加入量和沉积温度对HA/TiO2复合涂层物相组成及表面形貌的影响,同时对复合涂层的结合强度、生物活性进行了研究。结果表明,HA/TiO2复合涂层由HA和TiO2组成,其中HA晶体含量随电解液中TiO2加入量的增加而减小;HA晶体尺寸随电沉积温度升高呈增大趋势;在120℃,15 g/L TiO2条件下,电沉积HA/TiO2复合涂层的结合强度达到18 MPa。TiO2的加入没有影响涂层的生物活性。     

微波诱导羟基磷灰石 / 钛合金界面反应的研究

为改善钛合金和HA涂层的界面相容性,采用电泳法在钛合金表面预先沉积均匀的HA涂层,再于1200℃下进行微波处理。通过对涂层相结构的分析,证明在微波诱导作用下,形成了梯度结构的涂层。梯度过渡层由TiO2和TiO组成的致密氧化层、CaTiO3和微量HA组成,能够缓解HA涂层与钛合金热膨胀系数不匹配的问题,减少涂层开裂,提高涂层与基体的结合强度。     

电沉积制备氧化石墨烯-羟基磷灰石复合涂层

采用电沉积方法在钛表面制备氧化石墨烯-羟基磷灰石(Graphene oxide/Hydroxyapatite,GO/HA)复合涂层,通过调整GO的浓度,研究GO对所得涂层晶体结构及生物学性能的影响。采用扫描电镜(SEM)、透射电镜(TEM)、X射线衍射(XRD)仪、傅里叶变换红外光谱(FTIR)、拉曼光谱分析所得涂层的表面形貌和物相构成,用SEM观察涂层表面MG63成骨样细胞生长情况。结果表明,电沉积法可在钛表面制备GO/HA复合涂层,且随GO浓度增加,HA结晶度增加。此外,复合涂层较单纯HA涂层更能促进成骨样细胞早期粘附。     

电泳沉积HA／Ti复合涂层的结合强度和热稳定性

为了制备均匀致密、结合强度较高的电泳陶瓷涂层,用正丁醇作分散介质,在Ti基底上电泳沉积HA/Ti复合涂层。研究了Ti基底处理、烧结温度控制以及悬浮液配方等因素对涂层结合强度的影响。用扫描电镜(SEM)对热处理后涂层形貌和结构进行观察,采用红外光谱仪(FTIR)、X射线衍射仪(XRD)、差示扫描量热仪(DSC/TG)对涂层的组成和热稳定性进行了表征。结果表明:用H2O2/NH3·H2O处理Ti基底,700℃下烧结,Ti含量为44.6%的HA/Ti复合涂层结合强度可达到23.2MPa。     

脉冲电化学沉积制备n-HA/ZrO2复合涂层

用脉冲电化学沉积法在生物医用钛金属表面成功制备了纳米RA/ZrO2复合涂层,涂层中的成分均以离子形式沉积到基材上,得到ZrO2均匀分布的HA/ZrO2复合涂层.脉冲电位为-3.5 V时有利于离子的沉积结晶,有利于复合涂层的沉积.复合涂层的成分、结构、形貌及生物活性等的研究结果表明:复合涂层烧结前成分为HA、OCP及碱式硝酸锫,高温烧结后得到均匀致密HA/ZtO2复合涂层.检测表明HA/ZrO2复合涂层能够诱导磷灰石生成,具有较好的生物活性.     

电泳沉积法在Ni-W基带上制备YBa_2Cu_3O_(7-δ)超导厚膜(英文)

研究La0.4Sr0.6TiO3(LSTO)缓冲层和YBa2Cu3O7-δ(YBCO)超导厚膜的低成本制备技术。采用X射线衍射分析LSTO和YBCO膜的晶体取向,利用标准四引线法分析LSTO薄膜的导电性能和YBCO厚膜的超导性能。首先采用金属有机沉积法(MOD)成功在Ni-W基带上制备取向较好、表面光滑致密的LSTO缓冲层;然后采用电泳沉积(EPD)技术制备YBCO超导厚膜。研究电泳沉积电压和沉积时间对YBCO涂层性能的影响。结果表明:138V下电泳沉积35 min所制备的YBCO涂层,临界电流密度可达600 A/cm2(0 T,77 K)。     

等离子喷涂HA/(HA+TiO2)复合生物涂层的研究

用X射线衍射仪(XRD)、电子探针(EPMA)等检测手段，以大气等离子喷涂法在纯钛表面制备的羟基磷灰石HA／(HA TiO2)复合涂层及其热处理为研究对象，探讨了TiO2在羟基磷灰石复合涂层中的作用。结果表明，喷涂后的(HA TiO2)过渡层中交替分布的HA和TiO2结合致密；HA／(HA TiO2)涂层表面裂纹比对应纯HA涂层的细小，涂层内部结合致密，证实TiO2的加入具有缓和应力的作用。     

晶化处理对HA/(HA+TiO2)涂层组织结构的影响

用X射线衍射仪（XRD）、电子探针（EPMA）等检测手段，以晶化处理对大气等离子喷涂法在纯钛表面制备的HA／（HA＋TiO2）复合涂层为研究对象，探讨了晶化处理对HA／（HA＋TiO2）涂层组织结构和成分分布的影响。结果表明：晶化处理后HA／（HA＋TiO2）涂层结晶度明显提高；（HA＋TiO2）过渡层中交替分布的HA和TiO2结合致密；涂层表面裂纹比对应纯HA涂层细小，涂层内部结合致密，证实TiO2的加入具有缓和应力的作用。     

原子层沉积制备的燃料喷嘴表面钝化层的抗结焦性能

采用原子层沉积(ALD)技术在燃油喷嘴模拟实验件表面制备了TiO2、TiO2/Al2O3和TiO2/Ru 3种结焦抑制涂层,在实验温度为800 K,燃油流速为1.26 m/s的条件下对有涂层试样与无涂层试样的抗积碳性能进行了测试.结果 表明:TiO2涂层有效地降低了试样表面的粗糙度,阻止了基底易结焦元素(Fe、Cr)的暴露,同时减弱了结焦前驱体的黏附,积碳速率仅为0.0149％/h,和无涂层试样相比,积碳速率降低约一个数量级,相比于TiO2/Al2O3和TiO2/Ru涂层,抗结焦效果最优.     

Electrophoretic deposition of hydroxyapatite coatings on titanium from dimethylformamide suspensions

Hydroxyapatite powders were prepared by a chemical precipitation method and electrophoretically deposited on pure Ti surgical substrates. The powders were suspended in dimethylformamide (DMF). The zeta potential, electromobility and the conductivity of the HA suspension was characterized at various pH values to identify the most stable dispersion conditions. The effect of applied voltage and deposition time on deposition rate, deposition thickness and coating morphology were studied. The coating morphology and composition were characterized by scanning electron microscopy (SEM). The crystalline phase of HA before and after electrophoretic deposition was examined using X- ray diffraction (XRD). Transition electron microscope (TEM) indicated that HA consisted of needle-shaped crystallites.     

低压沉积-微弧氧化制备钛金属HA-TiO2复合膜层

采用低压沉积-微弧氧化法,在钛金属表面直接制备了具有生物活性的HA-TiO2复合膜层,通过XRD和SEM分别分析了膜层的相结构和表面形貌,探讨了沉积参数对膜层中HA含量与表面形貌的影响.结果表明:低压沉积处理是微弧氧化法制备HA-TiO2复合膜层的必要条件;复合膜层主要由金红石型和锐钛矿型TiO2及HA组成,HA以白色...     

Surface characterization of plasma sprayed pure and reinforced hydroxyapatite coating on Ti6Al4V alloy

Hydroxyapatite coatings suffer from poor mechanical properties like fretting fatigue, toughness and abrasive wear resistance. These properties can be enhanced by incorporation of secondary ceramic and metallic reinforcements in HA. An attempt has been made to deposit HA and HA reinforced with 10 wt.% (80Al₂O₃-20TiO₂) by plasma spray process on Ti6Al4V substrate. These coatings have been characterized using SEM/EDAX, XRD and FTIR spectroscopy. Corrosion studies have been done in SBF solution. Bio compatibility study is not included in this work. Reinforcement has enhanced the tensile strength. There is marginal improvement in microhardness and surface roughness with reinforcement. Both pure and reinforced coatings show superior resistance against corrosion in simulated body fluid.     

Electrophoretic deposition of titanium/silicon-substituted hydroxyapatite composite coating and its interaction with bovine serum albumin

Silicon-substituted hydroxyapatite (Ca10(PO4)6-x(SiO4)x(OH)2-x, Si-HA) composite coatings on a bioactive titanium substrate were prepared by electrophoretic deposition technique with the addition of triethanolamine (TEA) to enhance the ionization degree of Si-HA suspension. The surface structure was characterized by XRD, SEM, XRF, EDS and FTIR. The bond strength of the coating was investigated. The results show that the depositing thickness and the images of Si-HA coating can be changed with the variation of deposition time. The XRD spectra of Ti/Si-HA coatings show the characteristic diffraction peaks of HA, and the incorporation of silicon changes the lattice parameter of the crystal. The FTIR spectra shows that the most notable effect of silicon substitution is the decrease of intensities of -OH and PO43- groups with the silicon contents increasing. XRD and EDS element analyses present that the content of silicon in the coating increases with increasing silicon concentration in the suspension. The bioactive TiO2 coating formed may improve the bond strength of the coatings. The interaction of Ti/Si-HA coating with BSA is much greater than that of Ti/HA coating, suggesting that the incorporation of silicon in HA is significant to improve the bioactive performance of HA.     

Effect of Spray Distance on Microstructure and Tribological Performance of Suspension Plasma-Sprayed Hydroxyapatite–Titania Composite Coatings

Hydroxyapatite (HA)–titania (TiO₂) composite coatings prepared on Ti6Al4V alloy surface can combine the excellent mechanical property of the alloy substrate and the good biocompatibility of the coating material. In this paper, HA–TiO₂ composite coatings were deposited on Ti6Al4V substrates using suspension plasma spray (SPS). X-ray diffraction, scanning electron microscopy, Fourier infrared absorption spectrometry and friction tests were used to analyze the microstructure and tribological properties of the obtained coatings. The results showed that the spray distance had an important influence on coating microstructure and tribological performance. The amount of decomposition phases decreased as the spray distance increased. The increase in spray distance from 80 to 110 mm improved the crystalline HA content and decreased the wear performance of the SPS coatings. In addition, the spray distance had a big effect on the coating morphology due to different substrate temperature resulting from different spray distance. Furthermore, a significant presence of OH^? and CO₃ ^2? was observed, which was favorable for the biomedical applications.     

溶胶凝胶法制备TiO_2/HA复合生物活性涂层及其体外活性

通过溶胶凝胶法在纯钛基体上制备了羟基磷灰石(HA)/TiO2复合生物活性涂层。HA和TiO2溶胶由前驱体制得,按不同摩尔比直接混合两种溶胶来制备混合溶胶。HA可以提高钛基的生物活性,TiO2可以提高涂层与基体的物理、化学相容性和结合强度。粘结拉伸结果表明,复合涂层与基体结合良好,比纯HA涂层与基体的结合强度提高约47%。复合涂层试样于SBF中浸泡4、7和14d的SEM分析结果表明,复合涂层表面的类骨磷灰石生成量较高。成骨细胞实验结果表明,复合涂层上细胞铺展良好。     

Electrochemical deposition of hydroxyapatite coatings on titanium

1 Introduction Titanium implants have been used widely for various types of bone-anchored reconstructions due to their excellent corrosion resistance and mechanical properties. However, titanium exhibits poor osteoinductive properties, fortunately, which…     

Synthesis and Characterization of Hydroxyapatite/TiO<Subscript>2</Subscript> Coatings on the β-Type Titanium Alloys with Different Sintering Parameters using Sol-Gel Method

In this study, hydroxyapatite (HA) based composite films were successfully syntheses on the β-type Ti29Nb13Ta4.6Zr (TNTZ). The solutionized TNTZ substrates coated with HA and HA/Titania (TiO₂) bioactive composite coatings by sol-gel method under various sintering parameters related to sintering temperatures and heating ramp rates. Microstructural observations of the coatings revealed that apatite was formed on the substrates. The hardness values of the coatings increase with increasing both the sintering temperature and the TiO₂ concentration in the coatings layer. However, it was found that the heating ramp rate of the sintering was not affecting the hardness values so much. Also, the hardness values of the HA/TiO₂ composite coatings at all sintering temperatures were higher than only HA coated TNTZ samples due to the existence TiO₂ phases in the HA matrix. Results indicating that the doping of HA with TiO₂, improve the physical consistency between the coating layer and the substrates and provide a better inter-particle bonding due to the existence TiO₂ phases in the HA.     

Electrophoretic deposition of bioactive glass/polymer composite coatings with and without HA nanoparticle inclusions for biomedical applications

Electrophoretic deposition (EPD) methods have been developed for the fabrication of composite bioactive glass–hydroxyapatite (HA)–chitosan and bioactive glass–HA–alginate composite coatings. Two different strategies have been utilized, which are based on the use of cationic chitosan and anionic alginate biopolymers. The mechanism of cathodic deposition of chitosan is based on the pH increase at the cathode surface, whereas the pH decrease at the anode surface enabled the deposition of alginate coatings. The use of chitosan and alginate enabled the electrosteric stabilization and deposition of bioactive glass and HA particles. Composite coatings were obtained on various conductive substrates and studied by thermogravimetric analysis (TGA), differential thermal analysis (DTA), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The composition of the coatings can be varied by variation of bioactive glass and HA concentrations in the suspensions. The proposed method offers the advantages of room temperature fabrication of bioactive composite coatings that are suitable for biomedical applications.