在钛基上电泳沉积羟基磷灰石生物陶瓷涂层的研究

将羟基磷灰石(HAP)电泳沉积在钛基材上，得到了结构稳定的HAP生物陶瓷涂层。研究了电场强度、悬浮液温度、电泳时间、分散介质及HAP浓度对涂层形貌的影响。通过红外光谱仪(FTIR)和X射线衍射仪(XRD)对涂层的组成及结构进行了分析，并采用扫描电镜(SEM)对涂层煅烧前后的微观形貌进行了观察。结果表明：在正丁醇作为分散剂、悬浮液温度30℃、电场强度250V／cm、电泳时间300s以及HAP浓度5．0g／L的条件下可制得形貌较好的HAP生物陶瓷涂层；经二次电泳沉积及煅烧后得到的HAP生物陶瓷涂层均匀致密．     

电泳沉积磷灰石生物陶瓷涂层的研究进展

羟基磷灰石(HA)生物涂层材料是最有发展前途的生物硬组织替代材料之一.电泳沉积具有装置简单,操作方便,非线性,沉积温度低等特点,可以解决传统HA生物陶瓷涂层制备工艺上的各种不足.文中探讨了电泳沉积的各种工艺影响因素,综合介绍了国内外有关电泳沉积HA复合(梯度)生物涂层和电泳沉积与其它方法复合制备HA生物涂层的研究报道,进而提出了相应的设想和展望.     

电化学方法制备磷酸钙生物陶瓷镀层

电化学方法是制备磷酸钙生物陶瓷镀层的重要方法之一,具有其它方法无可比拟的优点。基于电化学原理有三种技术可用于制备生物活性陶瓷镀层一电沉积技术、电化学复合共沉积技术和电泳沉积技术。本文对这三种技术用于制备磷酸钙生物陶瓷镀层的原理、特点及应用作了评述。     

钛合金表面电泳沉积氟羟基磷灰石涂层

采用沉淀法制备了氟掺杂的氟羟基磷灰石(FHA,Ca_(10)(PO_4)_6OH_(2–x)F_x(x=0~2))粉体,并采用电泳沉积在钛合金(Ti_6Al_4V)表面制备了FHA涂层。通过改变沉积电压、时间及电极间距获得不同沉积量的涂层,采用X射线衍射、扫描电子显微镜研究了电压、时间、电极间距以及热处理对涂层形貌、物相组成和涂基结合强度的影响,确定制备FHA涂层的最佳沉积工艺和热处理制度。结果表明:控制沉积电压15 V、沉积时间1 min、电极间距1 cm的条件下沉积涂层并在N_2气氛下900℃保温1 h热处理可制得涂层质量好,涂基结合强度高的FHA生物陶瓷涂层。     

电泳沉积功能陶瓷涂层技术

本文评述了功能陶瓷悬浮液的稳定性、电泳沉积技术原理、以及该技术在制备生物陶瓷、超导陶瓷、铁电陶瓷、耐磨耐高温陶瓷等功能陶瓷涂层方面的应用。讨论了电流、电压、分散介质及陶瓷本身特性等因素对电泳沉积过程和功能陶瓷沉积层性能的影响。     

生物活性陶瓷涂层材料的制备及研究进展

介绍了生物活性陶瓷涂层材料的种类以及制备生物活性陶瓷涂层材料的主要方法:等离子喷涂、溶胶-凝胶法、电沉积和激光熔覆等,并且介绍了各个方法的对生物陶瓷涂层的工艺参数、界面结合等因素进行分析,最后展望了生物陶瓷涂层的发展前景,并提出了生物陶瓷涂层材料今后的研究方向。     

金属表面电泳法制备陶瓷涂层的研究进展

陶瓷涂层具有耐磨、耐蚀、耐高温和抗微生物侵蚀等性能。介绍了国内外用电泳沉积法制备生物陶瓷涂层、碳化硅陶瓷涂层、氧化钛陶瓷涂层、氧化铝陶瓷涂层、氧化硅陶瓷涂层及氧化锆陶瓷涂层的研究进展,揭示了防腐领域中陶瓷涂层存在的问题,提出了解决方法并展望了未来的研究方向。     

湿法合成羟基磷灰石生物陶瓷材料的研究

本文主要研究了羟基磷灰石生物陶瓷材料的湿法制备工艺及其性状，通过IR、DSC／TG和XRD等测试手段分析，得出了湿法合成HAP的最佳工艺条件，热处理到700℃可以制备高纯度的羟基磷灰石生物陶瓷材料。     

无机生物涂层材料研究进展及应用

无机生物涂层材料是综合利用金属基体的高强度、高韧性、高塑性以及生物陶瓷的表面活性和生物相容性的优点，成为材料科学领域及生物医学工程领域研究的热点。文章详细介绍了惰性生物陶瓷涂层材料、生物活性玻璃涂层和生物陶瓷涂层的分类、性能及其应用。另外，对无机生物涂层材料的各种制备方法作了详细介绍，最后对无机生物涂层材料的研究前景作了展望。     

电泳沉积-烧结两步法制备C/SiC复合材料

采用电泳沉积法在石墨基体上制备厚度可控的Si涂层,考察了电泳沉积参数(电压、沉积时间、固含量及添加剂量)对涂层沉积量的影响。所制备的Si涂层通过烧结与石墨基体发生在位反应形成SiC涂层。涂层成分的XRD分析表明烧结后生成β-SiC。用SEM观察涂层烧结前后的形貌,烧结后Si渗入基体内部。孔径分布数据表明所形成的SiC涂层导致石墨孔径变小。1200℃的抗氧化实验表明涂层起到了良好的防护作用。实验提供了一种制备C/SiC复合材料的新方法。     

等离子体喷涂生物陶瓷涂层

综合介绍了文献及中国科学院上海硅酸盐研究所在等离子体喷涂生物涂层方面的近期研究进展。羟基磷灰石涂层已在临床上获得应用,但使用效果仍然受其较低的结合强度和结晶度所制约。通过优化喷涂工艺和制备羟基磷灰石基复合涂层,可有效提高羟基磷灰石涂层的结合强度和结晶度。此外,为了获得综合性能优良的植入体材料,制备了多种新型的生物活性陶瓷涂层。纳米氧化钛涂层经合适工艺的后处理可具有良好的生物活性,由于其与钛合金基体有较高的结合强度,在体液环境下具有高稳定性和生物相容性,使纳米氧化钛涂层成为一种具有发展前景的植入体涂层候选材料。新型生物活性硅酸钙涂层具有良好的生物活性,与骨组织能形成有效结合。此外,对这些新型涂层的生物活性机制也做了必要的描述。     

The effect of lignin on the structure and characteristics of composite coatings electrodeposited on titanium

Composite coatings based on lignin, obtained by electrophoretic deposition (EPD) on titanium, were investigated. The aim of this work was to produce hydroxyapatite/lignin (HAP/Lig) coatings on titanium and to investigate the effect of the lignin concentration on microstructure, morphology, phase composition, thermal behavior and cytotoxicity of the HAP/Lig coatings. An organosolv lignin was used for the production of the composite coatings studied in this research. The properties of HAP/Lig coatings were characterized using X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM), thermogravimetric analysis (TGA), attenuated total reflection Fourier transform infrared spectroscopy (ATR-FT-IR) and X-ray photoelectron spectroscopy (XPS), as well as the MTT test of cytotoxicity. The results showed that higher lignin concentrations protected the HAP lattice during sintering, thereby improving the stability of the HAP/Lig coatings. The cell survival of peripheral blood mononuclear cells (PBMC) after proliferation indicates that the HAP/Lig coating with 1 wt% Lig electrodeposited on titanium was non-toxic with significant promise as a potential bone-repair material.     

羟基磷灰石生物陶瓷涂层制备方法评述

根据医用生物陶瓷羟基为磷灰石及医用金属材料的生物，力学特性，本文认为在金属基体表面涂覆羟基磷灰石是综合金属材料及生物陶瓷材料各自优越性阳有希望的途径这一。评述了羟基磷灰石涂层的制备方法，论证了较为优化的涂层结构。     

Influence of strontium and niobium on the physical and biological performance of hydroxyapatite as a bioactive coating on implant materials

The coating of hydroxyapatite (HAP) on the surface of bio-inert metallic implants to augment their bioactivity is in use for the last two decades. Substitution of various materials in HAP further improves the functionality of these coatings. We demonstrate coating of Ti6Al4V alloy sheets with strontium and niobium reinforced HAP using microwave (MW) irradiation technique. Physical characterization revealed, uniform semicrystalline hydroxyapatite coating with enhanced surface roughness and microhardness. The increased surface roughness was accompanied by higher wettability and more protein adsorption. Electrochemical corrosion assessment showed a dramatic increase in corrosion potential and a noticeable decline in corrosion current density suggesting an enhanced anticorrosive behaviour. These implants also exhibited improved hemocompatibility and bacteriostatic properties. Cell viability and confocal microscopy studies of the coated samples showed enhanced cell attachment on the surface. We propose microwave irradiation as a fast and hassle-free alternative for one-pot synthesis and deposition of ionic substituted HAP on metallic implants.     

Calcium phosphate coatings prepared by aerosol-gel

The aerosol-gel process has been assayed for the deposition of calcium phosphate (CaP) coatings. The deposition conditions have been preliminarily studied in order to obtain polycrystalline hydroxyapatite (HAP) coatings. The evolution of composition, structure and morphology was monitored by FTIR, XRD and SEM techniques as a function of the sintering temperature. HAP coatings deposited on TiAlV substrates were further characterized by Auger and indentation techniques in order to measure their quantitative composition and adhesive strength, respectively. The results corroborate the high quality of aerosol-gel derived HAP coatings.     

HA生物活性陶瓷涂层制备方法研究进展

阐述了国内外学者对金属基羟基磷灰石生物活性涂层的研究状况,论述了羟基磷灰石涂层的制备方法,认为该材料是最具有发展前景的生物硬组织替代材料之一。     

Enhancement of mechanical properties of hydroxyapatite coating prepared by electrophoretic deposition method

The addition of bio-inert ceramics such as alumina and zirconia can significantly improve the mechanical properties of hydroxyapatite bioactive coatings and increase their biocompatibility. In the present study, the surface of a titanium substrate was coated by the electrophoretic deposition method (EPD). Moreover, the reaction bonding process has been used to precipitate the nanocomposite containing the hydroxyapatite (HA), alumina, yitteria-stabilized zirconia (YSZ). The coating process was performed by an electrical power supply and a suspension of hydroxyapatite, aluminum, and YSZ nanopowders. For preparing a suspension consisting of 50% isopropanol and 50% acetone, 0.6 g/L of iodine was used as a stabilizer. Green and sintered coatings were analyzed by FE-SEM and XRD. In addition, the mechanical properties such as bonding strength, hardness, and toughness were measured. The hardness, bonding strength, and toughness of the HA coating were 107 ± 10.3 HV, 10.8 ± 3.2MPa, and 0.72MPa√m, respectively, while those of the HA-Al₂O₃-YSZ nanocomposite coating were 213 ± 1.8 HV, 35 ± 1.6MPa, and 1.6MPa√m, respectively.     

Development of hydroxyapatite coatings on laser textured 316 LSS and Ti-6Al-4V and its electrochemical behavior in SBF solution for orthopedic applications

The current work focused on the development of hydroxyapatite (HAP) coating on laser textured metallic implants using electrophoretic deposition. HAP was synthesized by sol-gel technique and its phase purity and surface morphology were confirmed by FT-IR, XRD and SEM analysis. 316 L SS and Ti-6Al-4V metal implants were polished and the surface was modified using Nd-YAG laser operating at a pulse interval of 10 ns at various overlapping rate of 0%, 25% and 50%. The laser treated surface was characterized for its surface roughness using surface profilometry and surface morphology. The surface roughness of the metallic implants was increased by increase in the overlapping rate. The prepared HAP powder was electrophoretically deposited on bare and laser textured Ti-6Al-4V and 316 L stainless steel followed by vacuum sintering at 300 °C for 2 h. Scratch analysis results showed an improvement in adhesion strength for the HAP coatings on laser treated specimens than untreated metal. Corrosion efficiency of the coated samples was studied in SBF solution using EIS and potentiodynamic polarization studies. The result from the corrosion experiments proved increased corrosion resistance property of laser textured coated samples when compared to bare alloy due to higher adhesion of HAP coating on the metal surface.     

热处理对钛基体表面电泳沉积GO/HA生物活性涂层的影响

采用电泳沉积法在钛基体表面制备氧化石墨烯(GO)/羟基磷灰石(Ca₁₀(PO₄)₆(OH)₂, HA)复合涂层,通过XRD和SEM等测试手段对不同热处理条件下得到的GO/HA涂层进行表征。研究结果表明,热处理有助于促进涂层中HA结晶度的提高,600 ℃和800 ℃的热处理温度并没有导致HA发生热分解,但有可能破坏了涂层中GO的有序晶体结构。GO/HA涂层具有优异的生物活性,但随热处理温度的升高,涂层的润湿性和生物活性下降。热处理过程有利于涂层致密,加强涂层与基体的结合,800 ℃热处理后的涂层结合强度高达25.31 MPa。