共查询到19条相似文献,搜索用时 203 毫秒
1.
为了使钛合金(Ti-6Al-4V)具有生物活性,可在其表面施加生物活性羟基磷灰石(HA)涂层。对比了声电沉积法和碱热处理法实验结果,采用扫描电镜(SEM)、X射线衍射仪(XRD)、电子能谱(EDS)、傅立叶红外透射光谱(FTIR)以及划痕测试等进行了分析。结果表明,直接采用声电沉积法在钛合金表面制备的羟基磷灰石涂层,经热处理后存在龟裂剥落现象;通过碱热处理法,对钛合金基体表面进行预处理,然后,借助声电沉积法,在钛金属表面沉积了透钙磷石涂层,经热碱液处理转变成的羟基磷灰石涂层,涂层完整,未出现剥落。经进一步高温烧结处理,所制涂层仍呈片状形貌,其由部分含钠的羟基磷灰石组成,而且HA涂层破坏的临界载荷未烧结前的4.365N提高至烧结后的8.175N。 相似文献
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钛合金表面声电沉积/碱热处理法制备HA涂层研究 总被引:1,自引:0,他引:1
为了使钛合金(Ti-6Al-4V)具有生物活性,可在其表面施加生物活性羟基磷灰石(HA)涂层.对比了声电沉积法和碱热处理法实验结果,采用扫描电镜(SEM)、X射线衍射仪(XRD)、电子能谱(EDS)、傅立叶红外透射光谱(FTIR)以及划痕测试等进行了分析.结果表明,直接采用声电沉积法在钛合金表面制备的羟基磷灰石涂层,经热处理后存在龟裂剥落现象;通过碱热处理法,对钛合金基体表面进行预处理,然后,借助声电沉积法,在钛金属表面沉积了透钙磷石涂层,经热碱液处理转变成的羟基磷灰石涂层,涂层完整,未出现剥落.经进一步高温烧结处理,所制涂层仍呈片状形貌,其由部分含钠的羟基磷灰石组成,而且HA涂层破坏的临界载荷未烧结前的4.365 N提高至烧结后的8.175N. 相似文献
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为了制备生物活性与表面质量良好HA/TC4钙磷复合涂层,对仿生矿化法制备钛基羟基磷灰石过程中,干燥和沉积次数对涂层表面的影响进行了研究。试验采用划分相同温度梯度的干燥方案,以24h为总沉积时间,划分2次、3次干燥和沉积,利用X射线衍射(XRD)、扫描电镜(SEM)和能谱分析(EDS)对涂层形貌进行分析。结果表明:3次干燥和沉积后,HA钙磷涂层表面裂纹尺寸控制在宽5~13μm、长71~269μm的范围内,同时涂层均匀性也得到改善;3次沉积后钙磷比为5.81,HA的结晶度得到提高。同时,利用薄膜测厚仪测得3次沉积后涂层的厚度从33μm依次增加至39μm,拉伸试验结果显示3次沉积后结合强度可以增加至12.41MPa。采用仿生法、选择3次干燥和沉积后得到的涂层在表面形貌、涂层厚度、生物活性以及表面结合强度等方面均有利于临床应用。 相似文献
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碳/碳复合材料表面声电沉积/碱热处理复合工艺制备羟基磷灰石生物活性涂层研究 总被引:8,自引:0,他引:8
通过碱热处理工艺对碳/碳复合材料表面阴极声电沉积的磷酸钙生物陶瓷涂层进行处理,使其转变为磷灰石涂层,采用SEM,EDAX,FTIR,XRD等研究了涂层组成、结构和形貌的变化,并采用拉伸测试评价了涂层与基体的结合力,用SEM观察了涂层的断口形貌.结果表明:用声电沉积技术获得的片状透钙磷石涂层经碱热处理后而得到磷灰石涂层,涂层与基体形成了化学键合,且结合紧密,涂层的形貌没有显著变化,但涂层的致密度有所增加;拉伸测试表明涂层与基体的结合强度最大可达4.2 MPa 以上,涂层的失效部位主要在涂层内部,其失效方式为涂层的内聚破坏和界面脱粘. 相似文献
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为寻找适合于热解碳表面电泳沉积羟基磷灰石涂层的分散介质,借助于SEM、XRD和自动生化分析仪研究了不同非水分散介质对电泳沉积涂层的影响。结果表明,分散介质的种类对电泳沉积层的强度及附着能力有很大的影响,采用乙二醇作为分散介质可以显著地提高电泳沉积层的强度和附着能力。分散介质的粘度影响电泳沉积速度,采用粘度较高的乙二醇作为分散介质时,提高温度可显著提高电泳沉积速度。羟基磷灰石在乙二醇中的溶解度显著高于在乙醇和正丁醇中的溶解度,羟基磷灰石在分散介质中的溶解度越高,越容易导致电泳沉积层中羟基磷灰石颗粒的团聚,当烧结温度高于1 000℃时,沉积层中颗粒的团聚对涂层烧结性能没有明显影响。电泳沉积分散介质不会影响羟基磷灰石粉末的晶体结构。 相似文献
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钛基材上电化学沉积羟基磷灰石 总被引:1,自引:0,他引:1
通过电沉积法在经过阳极氧化的钛基材表面沉积磷酸钙盐涂层,再经碱热处理使磷酸钙涂层转变为羟基磷灰石涂层。扫描电镜(SEM)观察了阳极氧化后生成的TiO2纳米管的微观结构,以及生成的羟基磷灰石的形貌。X射线衍射仪(XRD)分析了涂层的相组成,同时测定了涂层与基体的结合强度。试验结果表明:电沉积涂层CaHPO4·2H2O经碱处理后转变为羟基磷灰石;电沉积添加双氧水与钛基材经过阳极氧化后使得涂层与基体结合强度有所提高。模拟体液浸泡试验表明涂层具有良好的生物活性。 相似文献
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一种制备仿生生物活性钙磷涂层的新方法 总被引:10,自引:0,他引:10
提出了一种在导电材料表面制备仿生生物活性钙磷涂层的新方法,即首先经阴极声电化学处理材料使表面带上含钙离子的功能化基团,然后浸入过饱和溶液,钙磷晶体在功能化表面上发生异相成核生长,从而形成薄膜或涂层。根据该方法,成功地在碳/碳复合材料表面制备了仿生五水磷酸八钙涂层,实现了生物惰性碳/碳复合材料表面生物活化改性。 相似文献
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目的 制备结晶度较高且裂纹较少的羟基磷灰石涂层。方法 采用等离子喷涂法,在不同功率下,于钛合金表面制备羟基磷灰石涂层。通过水蒸气处理法,在不同温度下处理羟基磷灰石涂层。使用扫描电子显微镜(SEM)和X射线衍射仪(XRD)分析羟基磷灰石的表面形貌和晶体结构。结果 当等离子喷涂功率从20 kW增大到29 kW时,羟基磷灰石涂层的沉积效率先增大后稳定,涂层结晶度先增大后减小,涂层中氧化钙的含量先增大后稳定。当喷涂功率为23 kW时,羟基磷灰石涂层结晶度较高。水蒸气处理能明显去除涂层中的α-磷酸三钙、β-磷酸三钙和氧化钙,当水蒸气处理温度从140 ℃增大到200 ℃时,羟基磷灰石涂层晶粒由棒状向颗粒状转变,涂层结晶度不断增大,涂层中磷酸四钙的含量先减小后增大,较高的温度会造成涂层表面微裂纹的产生。在模拟体液中浸泡后,经过水蒸气处理的涂层表面会诱导生成较纯的羟基磷灰石。180 ℃水蒸气处理后的涂层表面会沉积一层均匀的羟基磷灰石,生物活性较高。结论 羟基磷灰石涂层的结晶度随等离子喷涂功率的增大,先增大后减小,随水蒸气处理温度的上升而增大。在合适条件下制得的羟基磷灰石涂层具有较高的生物活性。 相似文献
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电流密度对声电沉积生物活性透钙磷石涂层结构和形貌的影响 总被引:5,自引:0,他引:5
通过声电沉积工艺在碳/碳复合材料表面制备了生物活性透钙磷石涂层,采用SEM、FFIR、XRD研究了超声场中电流密度对涂层组成结构和形貌的影响。发现在一定工艺条件下,随电流密度增加,涂层的平均晶粒尺寸减小,致密度增加;当电流密度小于l0mA/cm^2时涂层形貌为片状,l0mA/cm^2-26mA/cm^2时为粒状,32mA/cm^2时为花菜心状。且涂层中透钙磷石晶体的择优取向也发生变化,择优晶面依次为(021)、(111)、(220)。同时还讨论了涂层微观结构变化机理。 相似文献
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采用微弧氧化处理技术,在纯钛TA2表面制备了含钙磷的多孔复合氧化膜,用SEM、XRD、EPMA等分析了电解液成分对氧化膜形貌、成分、相构成及生物活性的影响。结果表明:纯钛表面微弧氧化后原位生成的含钙磷多孔性复合氧化膜由锐钛矿相TiO2,金红石相TiO2和基体Ti组成;随电解液中钙磷摩尔比(Ca/P)值的增大,表面孔洞数量增多、直径变小,膜中Ca/P值增大,锐钛矿相TiO2减少、金红石相TiO2增多;当电解液中Ca/P=5时得到的氧化膜的Ca/P值为1.528,将该样品经碱液处理后再在快速钙化溶液(FCS)中浸泡2 d后即有羟基磷灰石HA形成,表明其具有良好的生物活性。 相似文献
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Electrophoretic deposition of titanium/silicon-substituted hydroxyapatite composite coating and its interaction with bovine serum albumin 总被引:1,自引:0,他引:1
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. 相似文献
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炭/炭复合材料声电沉积钙磷生物活性涂层的生长机理 总被引:5,自引:0,他引:5
通过声电沉积在炭/炭复合材料表面制备钙磷生物活性涂层,采用SEM(带EDAX),XDR,FTIR研究电沉积时间对钙磷生物活性涂层的形貌、结构和组成的影响.实验结果表明:沉积初始先在炭/炭表面形成无定形层,片状磷酸氢钙(DCPD)在其表面生长,随着电沉积时间的延长,逐渐向针状的羟基磷灰石Ca10(PO4)6(OH)2(HA)转变,涂层厚度和n(Ca)/n(P)不断增加,涂层的结晶度和电解液的pH值下降.涂层为缺钙磷灰石.同时探讨了在炭/炭复合材料表面钙磷生物活性涂层的生长机理. 相似文献
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目的提高镁合金表面的耐腐蚀和耐磨损性能。方法采用非平衡磁控溅射离子镀技术与化学镀技术相结合,在GW83镁合金表面制备Ni+C复合膜层。通过扫描电子显微镜和拉曼光谱分析了薄膜的形貌、成分和结构。利用电化学和浸泡后ICP-AES测试,评价了该复合碳膜涂层的耐腐蚀性能。同时采用摩擦磨损试验获得Ni+C复合膜层的磨损寿命。结果 Ni+C复合膜层致密均匀,表面孔隙率极低,表面碳层为典型的类石墨膜并且含有大量的无序结构。相对于GW83镁合金来说,Ni+C复合膜层的存在导致在3.5%Na Cl溶液中的腐蚀电位正移了301 m V,腐蚀电流密度从186μA/cm2降低至11μA/cm2。浸渍后ICP-AES试验显示,Ni+C涂覆的镁合金GW83的金属离子释放量更低。摩擦磨损试验表明,Ni+C涂层的磨损寿命为7000 s,与镁合金基体相比,Ni+C复合涂层极大地提高了其磨损寿命。结论在该Ni+C复合膜层中,表面碳层较致密,与Ni层结合良好,显著提高了基体的耐腐蚀性能。此外由于存在较厚的Ni中间层,对膜层起到了较大的支撑作用,Ni+C复合膜层从而延长了基体镁合金的磨损寿命。 相似文献
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Xibo Pei Jian Wang Qianbing Wan Lijuan KangMinglu Xiao Hong Bao 《Surface & coatings technology》2011,205(19):4380-4387
Functionally graded carbon nanotubes/hydroxyapatite (CNTs/HA) composite coatings have been fabricated by laser cladding technique using CNTs/HA composite powders. As the feedstock for laser deposition, CNTs/HA composite powders were prepared by ball-milling different weight ratios (1%, 3% and 5%) of CNTs with HA powders. CNTs/HA composite coatings were fabricated with CNTs/HA composite powders and functionally graded coating was fabricated by sequentially depositing different CNTs/HA composite coatings on pure titanium. The phase composition, microstructure, micro-hardness, bonding strength and in vitro cellular responses of the composite coatings and the functionally graded composite coating were studied. The results show that the crystallinity of CNTs/HA composite coatings increased with increasing amount of CNTs in the powder mixture. The CNTs were dispersed homogeneously in the coatings to form an interconnected web and the cylinder graphic structure of CNTs was not changed after laser irradiation. Compared with pure HA coating, the maximum increase of the micro-hardness of CNTs/HA composite coatings was 46.8% and the micro-hardness of the functionally graded coating increased gradually through the thickness of this coating. Furthermore, the bonding strength of the functionally graded coating was nearly twice higher than that of pure HA coating. The in vitro cellular biocompatibility tests reveal that the functionally graded composite coating has comparable in vitro bioactivity with pure HA coating. 相似文献
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电泳沉积法制备HA/Ti0,复合涂层 总被引:1,自引:0,他引:1
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. 相似文献
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Xiong Xin-bo Zeng Xie-rong Zou Chun-li Li Ping Fan Yun-bo 《Surface & coatings technology》2009,204(1-2):115-119
Hydrothermal post-treatment was used to convert monetite coating fabricated by induction heating method on H2O2 treated C/C (HT-C/C) composites to an adherent HA coating. The monetite coatings were hydrothermally treated for 4 h at 373 K, 403 K, 423 K, and 453 K in a 50 mL autoclave. After hydrothermal post-treatment, the structure, morphology and the chemical composition of these HA coatings were characterized with XRD, FTIR SEM and EDS. A scratch test was conducted to measure the strength of the adhesion of the coatings to the HT-C/C substrate. The results showed that the degree of crystallinity and the Ca/P ratio of the HA coatings increased with increasing hydrothermal temperature. The submicron-level morphology and adhesion of the HA coatings were highly affected by the hydrothermal temperature. From the results, it can be suggested that 423 K was the best hydrothermal treatment temperature for the HA coatings which were transformed from the monetite coatings produced by the induction heating method on HT-C/C composites. 相似文献
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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… 相似文献