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Journal ArticleDOI: 10.1080/02670844.2020.1748349

Fabrication of Sr-functionalized micro/nano-hierarchical structure ceramic coatings on 3D printing titanium

04 Mar 2021-Surface Engineering (Taylor & Francis)-Vol. 37, Iss: 3, pp 373-380
Abstract: Effective and fast osseointegration is significantly affected by the topographic features and chemical compositions of titanium (Ti)-based orthopedic implants. In this study, strontium (Sr) ions fu...

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Topics: Titanium (55%), Osseointegration (51%), Ceramic (51%)
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5 results found


Patent
23 Aug 2019-
Abstract: The invention discloses a method for rapidly introducing function ions on the surface of titanium alloy, and belongs to the technical field of titanium alloy medical plant material surface functionalization modified treatment. The method comprises the steps that firstly, TC4 is adopted as an electrolytic anode, an electrolytic cell is adopted as an electrolytic cathode, and a volcano shaped porouscoating is formed on the surface of a TC4 sample through the plasma high temperature and high pressure transient sintering effect; then, a hydrothermal reaction method is used for introducing function ions into the coating, and meanwhile, the hydrophilicity is improved. The various function ions are evenly distributed on the surface of titanium alloy, and the adhesion and proliferation capabilityof osteogenesis cells is improved. According to the method, the coating can be prepared on the surface of the titanium alloy conveniently and rapidly, the ingredient of a solution is regulated in thefollow-up hydrothermal process, the function ions of Cu, Zn, Mg, Ce, Sr and the like are introduced to the surface of the coating, antibacterial or osteogenesis and other performances of a biologicalmedical metal material are improved, and the good application prospect is achieved in the fields of surface modification of medical implant materials and the like.

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Topics: Surface modification (59%), Titanium alloy (57%), Coating (55%) ... show more

4 Citations


Open accessJournal ArticleDOI: 10.2147/IJN.S280130
Cong Feng1, Yonghao Wu1, Quanle Cao1, Xiangfeng Li1  +2 moreInstitutions (1)
Abstract: Background There is still a big challenge to achieve a balance between mechanical characteristics and biological properties in biphasic calcium phosphate (BCP) ceramics. Purpose The present study focused on the in-situ whisker growth on BCP ceramics via different hydrothermal treatments and investigated the influences of these whiskers on the mechanical property and biological performance of the ceramics. Methods Five kinds of BCP ceramics with in-situ whisker growth, ie, BCP-C, BCP-HNO3, BCP-Citric, BCP-NaOH, BCP-CaCl2 and BCP-Na3PO4 were fabricated by different hydrothermal treatments. The phase compositions, morphologies, crystal structures and mechanical strengths of the obtained BCP ceramics were firstly characterized. Then, the in vitro cell adhesion, proliferation and alkaline phosphatase (ALP) activity of bone marrow stromal cells (BMSCs) on the BCP ceramics were evaluated. Lastly, the effects of in-situ whisker growth on the bone-like apatite formation abilities of BCP ceramics were also investigated by immersing them in simulated body fluid (SBF). Results The results demonstrated that the hydrothermal conditions, especially the hydrothermal media, were crucial to determine the phase composition and morphology of the in-situ whisker. Especially among the five media used (HNO3, Citric, NaOH, CaCl2 and Na3PO4), the Na3PO4 treatment resulted in the shortest whisker with a unique hollow structure, and kept the original biphasic composition. All five kinds of whiskers increased the mechanical strength of BCP ceramics to some extent, and showed the good ability of bone-like apatite formation. The in vitro cell study demonstrated that the in-situ whisker growth had no adverse but even positive effect on the adhesion, proliferation and ALP activity of BMSCs. Conclusion Due to the growth of in-situ whiskers, the mechanical property and biological performance of the obtained BCP ceramics could increase simultaneously. Therefore, in-situ whiskers growth offers a promising strategy for the expanded application of BCP ceramics to meet the requirements of regenerative medicine.

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Topics: Whisker (53%), Simulated body fluid (52%)

1 Citations


Journal ArticleDOI: 10.1016/J.CERAMINT.2021.09.168
Xin Xu1, Junyi Zhang2, Jiang Pan3, Desheng Liu3  +5 moreInstitutions (3)
Abstract: Three-dimensional (3D) printing of ceramics has attracted increasing attention in various fields. However, the pyrolysis of organic components used for binding or polymerization in 3D printing commonly causes a large shrinkage (up to 30 %–40 %), high porosity, and cracking or deformation, severely limiting practical applications. In this study, 3D printing of Al2O3 ceramic architectures with ultra-low shrinkage is realized by introducing inorganic binder aluminum dihydrogen phosphate (Al(H2PO4)3, AP) as a ceramic precursor. Compared to organic binders, the inorganic AP binder can undergo crystallization conversion, which reduces mass loss during sintering at high temperatures, resulting in low shrinkage. Moreover, AP can be used as a rheological modifier to regulate the printability of the ceramic ink for direct ink writing of Al2O3 ceramic architectures, such as wood-piled scaffolds, honeycomb structures, and tubes with high fidelity. The resultant Al2O3 structural ceramics sintered at 1250 °C exhibit good mechanical performance and structural integrity. Most importantly, the linear shrinkage of the printed ceramics is less than 5 %, which is several times lower than that of ceramics with organic binders. This study provides a viable strategy for fabricating high-performance ceramic architectures with good dimensional fidelity for practical applications.

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Topics: Shrinkage (60%), Ceramic (58%)

1 Citations


Open accessJournal ArticleDOI: 10.1039/D0RA01079K
Ruiyan Li1, Yongjie Wei1, Long Gu1, Yanguo Qin1  +1 moreInstitutions (1)
26 May 2020-RSC Advances
Abstract: Tantalum (Ta) is an element with high chemical stability and ductility that is used in orthopedic biomaterials. When utilized, it can produce a bioactive surface and enhance cell–material interactions, but currently, there exist scarce effective methods to introduce the Ta element onto the surface of implants. This work reported a sol–gel-assisted approach combined with micro-arc oxidation (MAO) to introduce Ta onto the surface of the titanium (TC4) substrate. Specifically, this technique produced a substrate with a hierarchically rough structured topography and introduced strontium ions into the film. The films were uniform and continuous with numerous crater-like micropores. Compared with the TC4 sample (196 ± 35 nm), the roughness of Ta (734 ± 51 nm) and Ta–Sr (728 ± 85 nm) films was significantly higher, and both films (Ta and Ta–Sr) showed increased hydrophilicity when compared with TC4, promoting cell attachment. Additionally, the in vitro experiments indicated that Ta and Ta–Sr films have the potential to enhance the recruitment of cells in the initial culture stages, and improve cell proliferation. Overall, this work demonstrated that the application of Ta and Ta–Sr films to orthopedic implants has the potential to increase the lifetime of the implants. Furthermore, this study also describes an innovative strategy to incorporate Ta into implant films.

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1 Citations


Journal ArticleDOI: 10.1007/S42235-020-0097-1
Yongjie Wei1, Yang Hu1, Mingrui Li1, Dongdong Li1Institutions (1)
Abstract: Tantalum (Ta) alloys have been widely used as bone repair materials due to their excellent biocompatibility. In present work, zinc (Zn) incorporated ceramic coatings with micro/nano hierarchical structure were successfully fabricated on Ta by micro-arc oxidation and hydrothermal treatment. The content of Zn ions is about (1.35 ± 0.3) wt%. Cortex-like rough morphology (Ra: 1.504 µm) with irregular vermiform slots can be clearly observed on the surface of Ta. More importantly, the coatings resembling the structure of natural bone can release Zn, Ca, and P ions in a controlled and sustained manner. The corrosion resistance of Ta is greatly improved after functionalized with ceramic coatings, confirming by potentiodynamic polarization tests. The bonding strength between the coatings and substrates can be up to 18.9 N. Furthermore, the surface of MAOs-HT@Ta is covered by bonelike apatite after immersed in Simulated Body Fluid (SBF) for three weeks, showing excellently bioactivity. These results suggest that the innovative Zn-incorporated micro/nano hierarchical coatings on Ta may be used as promising candidates for orthopedic implants.

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Topics: Simulated body fluid (55%), Ceramic (50%)
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32 results found


Journal ArticleDOI: 10.1016/J.BIOMATERIALS.2003.09.048
Long-Hao Li1, Young-Min Kong1, Hae-Won Kim1, Young-Woon Kim1  +3 moreInstitutions (1)
01 Jun 2004-Biomaterials
Abstract: The surface of a titanium (Ti) implant was modified by micro-arc oxidation (MAO) treatment. A porous layer was formed on the Ti surface after the oxidation treatment. The phase and morphology of the oxide layer were dependent on the voltage applied during the oxidation treatment. With increasing voltage, the roughness and thickness of the film increased and the TiO2 phase changed from anatase to rutile. During the MAO treatment, Ca and P ions were incorporated into the oxide layer. The in vitro cell responses of the specimen were also dependant on the oxidation conditions. With increasing voltage, the ALP activity increased, while the cell proliferation rate decreased. Preliminary in vivo tests of the MAO-treated specimens on rabbits showed a considerable improvement in their osseointegration capability as compared to the pure titanium implant.

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Topics: Titanium (55%), Anatase (53%), Oxide (53%) ... show more

619 Citations


Journal ArticleDOI: 10.1016/J.BIOMATERIALS.2003.09.103
Won-Hoon Song1, Youn-Ki Jun1, Yong Han2, Yong Han1  +1 moreInstitutions (2)
01 Aug 2004-Biomaterials
Abstract: Biomimetic apatite coatings on micro-arc oxidized titania films were investigated and their apatite-inducing ability was evaluated in a simulated body fluid (1.0 SBF) as well as in a 1.5 times concentrated SBF (1.5 SBF). Titania-based films on titanium were prepared by micro-arc oxidation at various applied voltages (250-500 V) in an electrolytic solution containing beta-glycerophosphate disodium salt pentahydrate (beta-GP) and calcium acetate monohydrate (CA). Macro-porous, Ca- and P-containing titania-based films were formed on the titanium substrates. The phase, Ca and P content, morphology, and thickness of the films were strongly dependent on the applied voltage. In particular, Ca- and P-containing compounds such as CaTiO3, beta-Ca2P2O7 and alpha-Ca3(PO4)2 were produced at higher voltages (>450 V). When immersed in 1.0 SBF, a carbonated hydroxyapatite was induced on the surfaces of the films oxidized at higher voltages (>450 V) after 28 days, which is closely related to the Ca- and P-containing phases. The use of 1.5 SBF shortened the apatite induction time and apatite formation was confirmed even on the surface of the films oxidized at 350 V, which suggests that the incorporated Ca and P in the titania films play a similar role to the Ca- and P-containing compounds in the SBF.

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Topics: Simulated body fluid (63%), Apatite (51%)

392 Citations


Journal ArticleDOI: 10.1016/J.CORSCI.2017.01.025
Lan-Yue Cui1, Shang-Dong Gao1, Ping-Ping Li1, Rong-Chang Zeng1  +3 moreInstitutions (2)
01 Apr 2017-Corrosion Science
Abstract: A micro-arc oxidation (MAO)/polymethyltrimethoxysilane (PMTMS) hybrid coating was fabricated via MAO processing and subsequent sealing with alkaline treatment and PMTMS. The surface morphologies, chemical compositions and corrosion resistances of the coatings were investigated using FE-SEM, FTIR, XRD and electrochemical and hydrogen evolution measurements. The results indicated that the alkaline treatment was beneficial to the silane treatment and that the MAO coating was efficiently sealed by the PMTMS film. The MAO/PMTMS coating significantly enhanced the corrosion resistance of the AZ31 alloy due to its self-healing function. Additionally, we suggest and discuss a corrosion mechanism for the coating.

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Topics: Coating (63%), Pitting corrosion (60%), Corrosion (58%) ... show more

209 Citations


Journal ArticleDOI: 10.1016/J.MATDES.2015.07.086
Yi Wang1, Huijun Yu1, Chuanzhong Chen1, Zhao Zhihuan1Institutions (1)
15 Nov 2015-Materials & Design
Abstract: Titanium and its alloys are expected to be ideal materials for biomedical applications. Various approaches have been used for biological properties improvement. Among various surface modification techniques, micro-arc oxidation (MAO), which can produce porous, adhesive and bioactive coatings for implantation, has aroused considerable attention. This paper gives a brief overview of biological assessment of bioactive coatings. It focuses mainly on the strategies of improving biological properties of MAO coated titanium and its alloys. The influence of the electrolyte, process parameters, pretreatment and post-treatment on the coating characteristics (surface micrograph, adhesion strength and biological compatibility etc.) is detailed in this article. MAO assisted by other methods to achieve superior biocompatibility is also discussed. Finally, the trend of development in the future is forecasted.

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Topics: Titanium (51%), Titanium alloy (51%), Biocompatibility (50%) ... show more

198 Citations


Journal ArticleDOI: 10.1016/J.APSUSC.2014.11.030
Abstract: In this paper, the micro-arc oxidation (MAO) coatings were performed on pure Ti and Ti6Al4V samples at 180 V. The results indicated that unlike the volcanic morphology of oxide layer on pure Ti, a cortex-like morphology with irregular vermiform slots was seen on MAO/Ti6Al4V sample. According to polarization curves, the corrosion resistance of untreated samples was significantly increased by MAO process. The electrochemical impedance spectroscopy analysis showed a lower capacitance of barrier layer (led to higher resistance) for MAO/Ti specimens. This indicates that corrosive ions diffusion throughout the oxide film would be more difficult resulted in a higher corrosion resistance. Tribocorrosion results illustrated that the potential of untreated samples was dropped sharply to very low negative values. However, the lower wear volume loss was achieved for Ti6Al4V alloy. SEM images of worn surfaces demonstrated the local detachment of oxide layer within the wear track of MAO/Ti sample. Conversely, no delamination was detected in MAO/Ti6Al4V and a mild abrasive wear was the dominant mechanism.

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Topics: Tribocorrosion (60%), Corrosion (53%), Oxide (51%) ... show more

112 Citations


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