共查询到19条相似文献,搜索用时 78 毫秒
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采用电泳沉积方法在钛基材表面制得羟基磷灰石(hydroxyapatite,HA)/葡萄糖复合涂层,经烧结处理得到多孔HA涂层。采用红外光谱仪、扫描电镜、X射线衍射和热重分析表征了涂层的组成、表面形貌、物相组成及热稳定性,黏结-拉伸实验测定涂层与基体的结合强度,人体模拟体液(simulated body fluid,SBF)浸泡测定涂层的生物亲合性。结果表明:经700℃烧结处理,复合涂层中的葡萄糖微粒热分解得到多孔HA涂层,孔径为2~20μm,涂层与基体的结合强度可达17.6MPa;在1.5倍SBF(各离子浓度为SBF的1.5倍)中浸泡5d后,多孔HA涂层表面碳磷灰石化,呈现良好的生物亲合性。 相似文献
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仿生法制备钛合金/羟基磷灰石复合涂层的研究 总被引:4,自引:0,他引:4
本研究了仿生溶液中钛合金表面沉积羟基磷灰石的技术路线。钛合金经抛磨、清洗.进行酸碱活化处理后,置于模拟体液(SBF)中,最终在钛合金基体上生成羟基磷灰石涂层。 相似文献
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以纯钛粉为原料,采用选区激光烧结(SLS)技术制备不同孔隙率仿生人工骨试样。测试烧结试样表面抗压强度,将试样表面处理后,在4倍模拟体液(SBF)中浸泡,利用X射线衍射、扫描电子显微镜和能谱分析表面涂层的物相组成,观察多孔试样的表面、纵切面及孔内涂层形貌,计算表面涂层的钙磷比。讨论了激光扫描速率和扫描间距对试样孔隙率的影响。结果表明:SLS可以获得内部连通微孔结构的试样。经过4倍模拟体液中浸泡8 d,在2组试样外表面及孔内均产生类骨磷灰石涂层,实现了HA钙磷涂层的三维生长。孔隙率较高的试样抗压强度为117 MPa,其表面诱导羟基磷灰石沉积的能力更强,且表面涂层的钙磷比与自然骨更接近,涂层的综合性能更好。 相似文献
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采用仿生法在改性模拟体液中于镁合金表面制备了羟基磷灰石(HA)涂层和氧化石墨烯/羟基磷灰石(GO/HA)复合涂层。利用扫描电子显微镜(SEM)和X射线衍射(XRD)对两种涂层进行了形貌和结构表征,通过析氢量测量、极化曲线和交流阻抗等方法分别研究了裸镁合金、含HA涂层及GO/HA涂层镁合金在pH为7.4的模拟体液(SBF)和3.5%NaCl溶液中的腐蚀行为。结果表明,氧化石墨烯增加了羟基磷灰石涂层的致密性,含GO/HA复合涂层的AZ91镁合金耐腐蚀性能最好,相对于裸镁合金,其腐蚀电流密度降低了一个数量级,析氢量降低了52%。 相似文献
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以三嵌段共聚物F127为模板剂,采用溶胶--凝胶法在AZ31镁合金表面制备了介孔45S5生物玻璃陶瓷涂层。通过扫描电子显微镜和比表面积测试等方法表征了涂层的表面形貌和介孔结构,探讨了F127在介孔结构形成中的作用机理以及介孔对涂层性能的影响,并通过浸泡实验研究了镁合金及其涂层在模拟体液(SBF)中的降解行为。结果表明:制得的涂层表面均匀、无裂纹,与基体形成良好的界面结合。在模拟体液中,该涂层能够显著地降低镁合金基体的腐蚀速率和诱导羟基磷灰石的沉积,有效地改善镁合金的耐蚀性和生物活性。 相似文献
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《陶瓷》2020,(4)
笔者采用化学沉淀法制备羟基磷灰石/碳纳米管复合粉体(HA/CNTs),并将这种复合粉体作为电解液的添加剂,采用微弧氧化的方法制备镁合金表面羟基磷灰石/碳纳米管(MAO/HA/CNTs)复合涂层。然后对制备的复合粉体分别采用扫描电子显微镜(SEM)、傅里叶红外光谱(FTIR)、X射线衍射分析(XRD)和电化学工作站研究其表面形貌、物相组成、以及对微弧氧化图层表面形貌和在模拟体液(SBF)中可以承受腐蚀的不同能力。研究结果显示,复合粉体在微弧氧化过程中均匀地沉积在镁合金表面,有很好的保护作用。所制备的羟基磷灰石/碳纳米管(HA/CNTs)复合粉体结晶良好,无任何杂质;电化学工作站中,MAO/HA/CNTs样品的腐蚀电位为-0.2~-2.0 V,通过在模拟体液中浸泡了7 d之后,其表面沉积了大量的亚纳米级的颗粒沉淀物,通过实验对镁基体和MAO样品进行试验,发现镁基体相比于MAO样品,具有的耐腐蚀性比较好,生物活性比较高。 相似文献
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《合成材料老化与应用》2017,(1)
通过电泳沉积的方法在生物医用钛基体表面制备羟基磷灰石(HA)/Al/壳聚糖(CS)复合涂层,通过高温烧结分解CS颗粒并制备钛基多孔HA/Al_2O_3复合生物陶瓷涂层。通过粘结-拉伸实验测定涂层与基材的结合强度;XRD和SEM对涂层的物相组成和形貌进行表征;CHI660C电化学工作站测试涂层在模拟体液中的耐蚀性能。研究表明,经过热处理后的涂层为表面可形成平均孔径为5μm的多孔HA/Al_2O_3,涂层厚度可达25μm,涂层中的HA颗粒致密粘连,Al在高温条件下反应成Al_2O_3从而使涂层与基体的结合强度最高可达30.5MPa,涂层的涂覆使Ti金属在人体模拟体液中具有良好的耐腐蚀能力。 相似文献
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Bioactive Calcium Phosphate Coating on Sodium Hydroxide-Pretreated Titanium Substrate by Electrodeposition 总被引:1,自引:0,他引:1
Ji-Ho Park Doug-Youn Lee Keun-Taek Oh Yong-Keun Lee Kyoung-Nam Kim 《Journal of the American Ceramic Society》2004,87(9):1792-1794
This study examined the characteristics of calcium phosphate coatings deposited on a NaOH-pretreated titanium substrate by electrodeposition in a modified simulated body fluid (SBF) immediately after electrodeposition as well as after the coatings had been immersed in the SBF for 5 d in order to determine the effects of a NaOH pretreatment on the bioactive coating prior to electrodeposition. The results showed that a dense and uniform coating that consisted of brushite and hydroxyapatite had formed on the NaOH-pretreated titanium substrate by electrodeposition. This coating had transformed to a bonelike apatite during immersion in the SBF. This was attributed to the increased surface area of the modified titanium formed after the NaOH treatment as well as the Na+ ions released from that surface. Therefore, a NaOH pretreatment is recommended as an effective method for preparing a bioactive calcium phosphate coating by electrodeposition. 相似文献
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《Ceramics International》2016,42(16):18466-18473
To improve the bioactivity of titanium and its alloys, dense and uniform apatite coatings were prepared on Ti6Al4V titanium substrates using microwave assisted aqueous chemical method. The influence of the pretreatment to the titanium substrates and the Ca/P molar ratio of the microwave solution on the coating deposition and morphology, as well as the bioactivity of the coated samples were studied. Results showed that during the microwave process, alkali treatment followed by heat treatment to the titanium substrates would promote the rapid deposition of hydroxyapatite to form coating. And the morphologies of the apatite coatings could be adjusted by the Ca/P molar ratio of the microwave solution. After immersion test in simulated body fluid (SBF), the coated titanium alloy exhibits a good bioactivity by inducing the formation of apatite depositions. 相似文献
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Hydroxyapatite coatings were directly prepared on anodized titanium by electro-deposition method in a modified simulated body fluid. The configuration, structure and bioactivity of the coating were investigated with scanning electron microscopy (SEM), X-ray diffraction analyzer (XRD) and Fourier transform infrared spectroscopy (FTIR) techniques. The results demonstrated that pure and homogeneous hydroxyapatite coating can be obtained without any post-treatment. The prepared coating showed good bioactivity in simulated body fluid (SBF). The time required for a fully covered dense hydroxyapatite coatings was 4 days immersion in SBF. 相似文献
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Sanosh Kunjalukkal Padmanabhan Francesca Gervaso Marina Carrozzo Francesca Scalera Alessandro Sannino Antonio Licciulli 《Ceramics International》2013,39(1):619-627
Wollastonite/hydroxyapatite composite scaffolds are proposed as bone graft. An investigation on scaffold with varying reinforcing wollastonite content fabricated by polymeric sponge replica is reported. The composition, sintering behavior, morphology, porosity and mechanical strength were characterized. All the scaffolds had a highly porous well-interconnected structure. A significant increase in mechanical strength is achieved by adding a 50% wollastonite phase. The most mechanically resistant (50/50) wollastonite/hydroxyapatite scaffolds were soaked in both simulated body fluid (SBF) and Tris–HCl solution in order to assess bioactivity and biodegradability. A carbo-hydroxyapatite layer formed on their surfaces when immersed in SBF. The biodegradability tests reveals that the composite scaffold shows a higher degradation rate compared to pure hydroxyapatite used as comparison. These results demonstrate that the incorporation of a 50% of wollastonite phase in hydroxyapatite matrix is effective in improving the strength and the bioactive and biodegradable properties of the porous scaffolds. 相似文献
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This article presents some results concerning chitosan apatite composites obtained by two different methods. First method is based on phosphorylation, calcification and soaking in different calcium phosphate growth media (1.5 × SBF (simulated body fluid), Ca‐PTris (calcium phosphorous tris) and the second method is based on mixing of calcium deficient apatite powder with a chitosan solution. This research is focused on studying and understanding the effect of using different methods on Ca:P ratio of composites. The Ca:P ratio of composites formed in 1.5 × SBF are closer to that of bone when compared with the Ca:P ratio of composites formed in Ca‐PTris solution and Ca:P ratio of composites formed by mixing of calcium deficient apatite powder with a chitosan solution. The Ca:P ratio of the composite (1.75) immersed in 1.5 × SBF for 35 day is similar to the theoretical value of hydroxyapatite (1.67) and equal to the theoretical value of human bone (1.75). POLYM. COMPOS., 2009. © 2008 Society of Plastics Engineers 相似文献
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《Ceramics International》2016,42(5):5772-5777
3D porous bioactive glass (BG) scaffolds were fabricated by the foam replication technique combining sol–gel and electrophoretic deposition (EPD) processes. A special EPD set-up was built to optimize the scaffolds fabrication, which results in the rapid production of BG-based scaffolds in comparison to the traditional time-consuming foam replication technique normally used for the same kind of BG scaffolds. The influences of parameters related to the BG sol (aging time) as well as to the electrically driven process (deposition voltage) were studied and discussed in terms of the final scaffolds microstructure. Bioactivity of the samples, in terms of hydroxycarbonate apatite (HCA) formation in simulated body fluid (SBF), was determined after 1 day of immersion in SBF, confirming the suitability of the new scaffolds for bone regeneration applications. 相似文献
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采用紫外辐射技术对金红石型二氧化钛进行表面改性处理,然后将其浸入模拟体液中初步探讨紫外辐射技术对其矿化性能的影响。X射线衍射和傅立叶变换红外光谱分析。结果表明,紫外辐射可显著提高金红石型二氧化钛诱导矿化的能力,浸入模拟体液中2d和7d可诱导碳酸羟基磷灰石生成;而未改性处理的金红石型二氧化钛短时间内难以诱导生成矿化层。 相似文献