Influence of pore characteristics on microstructure, mechanical properties and corrosion resistance of selective laser sintered porous Ti–Mo alloys for biomedical applications

Xie, Fangxia; He, Xiaocong; Cao, Shunli; Mei, Min; Qu, Xuanhui

doi:10.1016/j.electacta.2013.04.105

Cited by 125 publications

(68 citation statements)

References 52 publications

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“…The formation of fine pores on porous Ti-15Mo alloy should be mainly attributed to the sintering necks and Kirkendall effect, which was also reported on the sintered porous NiTi alloy [44]. The diffusion rate of Mo atoms in Ti particles is much slower than that of the self-diffusivity of Ti [45], which is susceptible to the unbalanced mass transfer and the formation of Kirkendall pores [25]. The formation mechanism of the large pore is a geometrical heredity effect of space-holder NH 4 HCO 3 particles [46].…”

Section: Resultsmentioning

confidence: 68%

“…The Mo element is diffused into the Ti lattice (α-Ti), resulting in the formation of β-Ti after sintering, since Mo is a β-stabilized element. In addition, the proportion of β phase increases with increasing the Mo contents [8,25]. For the dense Ti-Mo alloys prepared by casting or smelting, the Ti-Mo alloys can obtain a fully stabilized β phase Ti alloy at room temperature after solution treatment under rapid cooling when the Mo content reaches higher than 10 wt.% [8].…”

Section: Resultsmentioning

confidence: 99%

“…Recently, there are some reports about the porous TiMo alloys prepared by different methods, such as vacuum sintering [9,10], gelcasting [23], selective laser sintering [24,25] and atmosphere protection conventional sintering [21,26]. Microwave sintering is a new powder metallurgy sintering method to prepare the porous metallic materials, such as porous NiTi alloys [27,28], porous Ti6Al4V/ TiC/HA composites [29] and porous Ti/CaP composites [30].…”

Section: Introductionmentioning

confidence: 99%

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Preparation and bioactive surface modification of the microwave sintered porous Ti-15Mo alloys for biomedical application

Zhang

Bao

et al. 2017

Sci. China Mater.

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Biomedical porous Ti-15Mo alloys were prepared by microwave sintering using ammonium hydrogen carbonate (NH 4 HCO 3 ) as the space holder agent to adjust the porosity and mechanical properties. The porous Ti-15Mo alloys are dominated by β-Ti phase with a little α-Ti phase, and the proportion of α and β phase has no significant difference as the NH 4 HCO 3 content increases. The porosities and the average pore sizes of the porous Ti-15Mo alloys increase with increase of the contents of NH 4 HCO 3 , while all of the compressive strength, elastic modulus and bending strength decrease. However, the compressive strength, bending strength and the elastic modulus are higher or close to those of natural bone. The surface of the porous Ti-15Mo alloy was further modified by hydrothermal treatment, after which Na 2 Ti 6 O 13 layers with needle and flake-like clusters were formed on the outer and inner surface of the porous Ti-15Mo alloy. The hydrothermally treated porous Ti-15Mo alloy is completely covered by the Ca-deficient apatite layers after immersed in SBF solution for 14 d, indicating that it possesses high apatiteforming ability and bioactivity. These results demonstrate that the hydrothermally treated microwave sintered porous Ti15Mo alloys could be a promising candidate as the bone implant.

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Section: Resultsmentioning

confidence: 68%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Preparation and bioactive surface modification of the microwave sintered porous Ti-15Mo alloys for biomedical application

Zhang

Bao

et al. 2017

Sci. China Mater.

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“…debate in the literature as to its applicability. For example, Xie et al 46 have applied the two circuit models to analyze the EIS data of the porous Ti-Mo alloys with different porosity levels in a 0.9 wt% NaCl solution at 37…”

Section: Characterization Of Oxide Scales By Impedance Spectroscopymentioning

confidence: 99%

Oxidation resistance of Mo(Si_1−xAl_x)₂ nanocrystalline films and characterization of their oxide scales by electrochemical impedance spectroscopy

Munroe

et al. 2014

RSC Adv.

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To explore the influence of Al alloying on the oxidation resistance of MoSi 2 , four Mo(Si 1Àx Al x ) 2 nanocrystalline films, with differing Al contents, were fabricated on Ti-6A1-4V substrates by a doublecathode glow discharge technique and their cyclic oxidation behavior was characterized at 500 C in air.The oxidation kinetics of the four Mo(Si 1Àx Al x ) 2 films was found to obey a subparabolic behavior with respect to the overall exposure, and their oxidation resistance was improved by Al additions. On the other hand, the electrochemical behavior of the oxide scales developed on the four Mo(Si 1Àx Al x ) 2 nanocrystalline films in a 3.5 wt% NaCl solution was studied using electrochemical-impedance spectroscopy (EIS). The impedance data showed that with increasing oxidation time, the oxide scales transformed from a homogeneous and dense structure to a duplex structure consisting of a porous outer layer and a denser inner layer. The resistance of the oxide scales increased with increasing Al addition, implying an enhanced protective ability of the oxide scales by Al alloying in media containing chlorine ions. The findings represent a step forward in improving the surface integrity of alloy components used in the hot zones of jet engines.

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“…In fact, the addition of different elements can enhance specific properties of the material. For example, the addition of Mo to Ti enhances its porosity, thus reducing its Young's modulus [23]; the addition of Ta to Ti forms a stable coating on the surface of the Ti from the high chemical activity of Ta imparting higher chemical stability and corrosion resistance to the Ti-Ta alloy [24,25]; and the addition of Nb to Ti improves shape memory, which is beneficial to its application in the biomedical field [18,26].…”

Section: Introductionmentioning

confidence: 99%

Antibacterial Properties and Corrosion Resistance of the Newly Developed Biomaterial, Ti–12Nb–1Ag Alloy

Chao

Chiu

et al. 2017

Metals

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Currently, the development of biomaterials has focused on having a low Young's modulus, biocompatibility, corrosion resistance, and antibacterial properties. Ti-Nb alloys have higher research value due to their excellent corrosion resistance and low Young's modulus. In recent years, the antibacterial properties of materials have been enhanced by the addition of Ag and Cu. Therefore, the corrosion resistance and antibacterial properties of the Ti-12Nb-1Ag alloy formulated in the current study were investigated and compared to those of commonly used Ti alloys, G2 pure Ti (ASTM B348 CP Grade 2), and Ti-6Al-4V, via electrochemical and E. coli antibacterial tests. Meanwhile, we also carried out a microstructural analysis to investigate the composition of the alloy. The results were as follows: (1) The electrochemical test demonstrated that Ti-12Nb-1Ag had a higher corrosion resistance than Ti-6Al-4V, which is similar to the properties of pure Ti. (2) The E. coli antibacterial test demonstrated that the sterilization rate of Ti-12Nb-1Ag was higher than that of the Ti-6Al-4V alloy and pure Ti. (3) The microstructural analysis revealed that Ti-12Nb-1Ag had an acicular martensite structure, with nano-Ag precipitates observed. Based on the results of the E. coli antibacterial test and the principles of sterilization of nano-precipitates and Ag, we inferred that the nano-Ag precipitates of Ti-12Nb-1Ag enhanced the antibacterial properties of the newly developed biomaterial, which is, namely, the Ti-12Nb-1Ag alloy.

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Influence of pore characteristics on microstructure, mechanical properties and corrosion resistance of selective laser sintered porous Ti–Mo alloys for biomedical applications

Cited by 125 publications

References 52 publications

Preparation and bioactive surface modification of the microwave sintered porous Ti-15Mo alloys for biomedical application

Preparation and bioactive surface modification of the microwave sintered porous Ti-15Mo alloys for biomedical application

Oxidation resistance of Mo(Si_1−xAl_x)₂ nanocrystalline films and characterization of their oxide scales by electrochemical impedance spectroscopy

Antibacterial Properties and Corrosion Resistance of the Newly Developed Biomaterial, Ti–12Nb–1Ag Alloy

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Influence of pore characteristics on microstructure, mechanical properties and corrosion resistance of selective laser sintered porous Ti–Mo alloys for biomedical applications

Cited by 125 publications

References 52 publications

Preparation and bioactive surface modification of the microwave sintered porous Ti-15Mo alloys for biomedical application

Preparation and bioactive surface modification of the microwave sintered porous Ti-15Mo alloys for biomedical application

Oxidation resistance of Mo(Si1−xAlx)2 nanocrystalline films and characterization of their oxide scales by electrochemical impedance spectroscopy

Antibacterial Properties and Corrosion Resistance of the Newly Developed Biomaterial, Ti–12Nb–1Ag Alloy

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Oxidation resistance of Mo(Si_1−xAl_x)₂ nanocrystalline films and characterization of their oxide scales by electrochemical impedance spectroscopy