Influence of microstructure of TC4 substrate on the MAO coating

Wu, Guolong; Wang, Ye; Sun, Min; Zhang, Qunli; Yao, Jianhua

doi:10.1080/02670844.2019.1693732

Cited by 23 publications

(15 citation statements)

References 43 publications

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“…This improvement in the wear resistance could be correlated to the major thickness and minor presence of defects of the PEO coatings obtained on the produced substrate. As hypothesized by Wu et al [36], the small pore size of the PEO coatings obtained on the AM-produced substrate indicated the formation of fine discharges that contribute to an increase in oxidation time, thickening, and reduction in the formations of micro-cracks in the morphology of the coatings. Added to that, the reduction in the duty cycle (38.5%) compared to the previous article (51%) may have increased the life of the coatings during the wear test, since high duty cycle values lead to embrittlement, due to strong discharges with long life cycles that damage the coatings forming micro-cracks, leading to an increased mass loss of coatings during the wear test [67,68].…”

Section: Resultsmentioning

confidence: 56%

“…In contrast, the commercially annealed Ti-6Al-4V alloy has α + β phases equiaxial microstructure, with grain size larger than that obtained by the L-PBF process. According to Wu et al [36], the non-equilibrium phases in the addictively manufactured Ti-6Al-4V substrate have a larger number of grain boundaries, due to its small grain size, providing more nucleation sites for the passive film in the initial stage of the PEO process. Moreover, the high-energy grain boundaries and other microstructural defects, arising from the microstructure obtained at high cooling rates, promoted a higher growth rate of the coatings obtained over the AM process, due to the storage of excess energy to accelerate the kinetics of the chemical reaction with smaller amounts of microcracks.…”

Section: Resultsmentioning

confidence: 99%

“…Wu et al [36] investigate the properties of PEO coatings formed on SLM Ti-6Al-4V alloy and the microstructure influence on growth behavior, showing that the coatings formed on the substrate produced by the SLM technique have fewer defects, small size pores, and major thickness than that forming in commercial Ti-6Al-4V alloy. However, the authors have carried out no tribological test.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Wear Resistance of Plasma Electrolytic Oxidation Coatings on Ti-6Al-4V Eli Alloy Processed by Additive Manufacturing

Santos

Castro

Baldin

et al. 2022

Metals

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The additive manufacturing (AM) technique can produce Ti-6Al-4V ELI (extra low interstitial) alloy for personalized biomedical devices. However, the Ti-6Al-4V ELI alloy presents poor tribological behavior. Regarding this, coatings are a feasible approach to improve the wear resistance of this alloy. In the literature, the tribological behavior of TiO2 coatings incorporated with Ca and P formed by one-step plasma electrolytic oxidation (PEO) on Ti-6Al-4V ELI alloy processed by AM has not been investigated. Thus, in the present work, it was studied the influence of Ti-6Al-4V ELI alloy processed by AM on the wear resistance and morphologic of the coating obtained by PEO (plasma electrolytic oxidation). In this way, three different voltages (200, 250, and 300 V) were employed for the PEO process and the voltage effect on the properties of the coatings. The coatings were characterized by contact profilometry, scanning electron microscopy, energy-dispersive spectroscopy, the sessile drop method, grazing-incidence X-ray diffraction, and wear tests, on a ball-on-plate tribometer. The increase in applied voltage promoted an increase in roughness, pore area, and a decrease in the pore population of the coatings. In addition, the coatings, mainly composed of anatase and rutile, showed good adhesion to the metallic substrate, and the presence of bioactive elements Ca and P were detected. The thickness of the coatings obtained by PEO increases drastically for voltages higher than 250 V (from 4.50 ± 0.33 to 23.83 ± 1.5 µm). However, coatings obtained with lower voltages presented thin and dense layers, which promoted a superior wear resistance (increase in wear rate from 1.99 × 10−6 to 2.60 × 10−5 mm3/s). Finally, compared to the uncoated substrate, the PEO coatings increased the wear resistance of the titanium alloy obtained by AM, also showing a superior wear resistance compared to the commercial Ti-6Al-4V alloy previously evaluated, being such a positive and promising behavior for application in the area of metallic implants.

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Section: Resultsmentioning

confidence: 56%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Wear Resistance of Plasma Electrolytic Oxidation Coatings on Ti-6Al-4V Eli Alloy Processed by Additive Manufacturing

Santos

Castro

Baldin

et al. 2022

Metals

View full text Add to dashboard Cite

show abstract

“…I corr was 5.392 × 10 −8 A cm −2 for S‐MAO and was 8.359 × 10 −8 A cm −2 for F‐MAO. [ 225 ] Obviously, S‐MAO has a higher corrosion resistance than F‐MAO, due to the fact that S‐MAO coating is thicker, and its pore size is smaller than F‐MAO coating. Furthermore, S‐MAO had a higher corrosion resistance than MAO‐treated selective EBM‐produced Ti6Al4V alloy, as shown in Figure a.…”

Section: Electrochemical Methodsmentioning

confidence: 99%

Surface Modification of Porous Titanium and Titanium Alloy Implants Manufactured by Selective Laser Melting: A Review

Liu,

Li,

Wang

et al. 2023

Adv Eng Mater

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Titanium (Ti) and its alloy implants with porous structure manufactured by selective laser melting (SLM) can match elastic modulus of human bone to reduce the stress‐shielding effect and satisfy the personalized requirement in orthopedic surgery. Compared with conventional casting and forging Ti and its alloy implants, SLM implants possess unique microstructural features and excellent comprehensive mechanical properties. However, the un‐melted powder particles inevitably adhere to the surfaces of SLM implants, which may result in excessive surface roughness and potential health risks. Moreover, there are significant issues encountered, such as bioactivity, toxicity, antibacterial activity, corrosion and wear resistance. Consequently, surface modification methods are essential to remove the un‐melted powder particles and improve biological and mechanical properties of SLM implants. Herein, the research efforts focus exclusively on chemical (acid treatment, alkali treatment, sol‐gel, chemical vapor deposition and atomic layer deposition) and electrochemical methods (anodization and microarc oxidation) for SLM Ti and its alloy implants, especially for porous structures. Particularly, the characteristics of these methods are summarized, and their commonly used pre‐ and post‐treatment methods are introduced. In addition, the development trends and challenges in surface modification of SLM Ti and its alloy implants are discussed.This article is protected by copyright. All rights reserved.

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“…Ti6Al4V (TC4) alloy has been widely used in marine, aerospace and biomedical fields due to its excellent properties such as low density, high specific strength, excellent corrosion resistance and biocompatibility [1,2]. Accordingly, it is one of the commonly used materials for additive manufacturing (AM) of components with functional and complex geometry.…”

Section: Introductionmentioning

confidence: 99%

Influence of Scanning Strategy on the Performances of GO-Reinforced Ti6Al4V Nanocomposites Manufactured by SLM

Miao

Liu

et al. 2020

Metals

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In this work, the effects of line (L-scanning strategy), stripe (S-scanning strategy), hollow square (H-scanning strategy) and chess board partition (C-scanning strategy) on the performances of graphene oxide reinforced Ti6Al4V matrix nanocomposites (GO/TC4) as fabricated by selective laser melting (SLM) were investigated. Numerical temperature field simulation of four different scanning strategies was utilized to investigate the effects of thermal concentration on SLM-processed GO/TC4 nanocomposites, linking to its micro-voids, surface roughness, porosity, microhardness and tribological properties. The proposed simulation scheme is validated by comparing the simulated thermal analysis with experimental results. Simulation results show that the thermal concentration effects of a part during SLM process is distinctive under different scanning strategies, with the slowest cooling rate of 64,977.5 °C/s that is achieved by C-scanning strategy specimen. The experimental results indicate that the performances of the L-scanning strategy or S-scanning strategy sample are seriously affected by the thermal concentration, causing a large number of micro-voids and defects. All the experimental results suggest that the sample using C-scanning strategy exhibits the optimal performance of all investigated specimens, which closely correlates with its lowest temperature gradients. This study highlights the importance of using a partition scanning strategy during SLM process, which can be easily extended to other powder bed fusion process.

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Influence of microstructure of TC4 substrate on the MAO coating

Cited by 23 publications

References 43 publications

Wear Resistance of Plasma Electrolytic Oxidation Coatings on Ti-6Al-4V Eli Alloy Processed by Additive Manufacturing

Wear Resistance of Plasma Electrolytic Oxidation Coatings on Ti-6Al-4V Eli Alloy Processed by Additive Manufacturing

Surface Modification of Porous Titanium and Titanium Alloy Implants Manufactured by Selective Laser Melting: A Review

Influence of Scanning Strategy on the Performances of GO-Reinforced Ti6Al4V Nanocomposites Manufactured by SLM

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