The Experts below are selected from a list of 36408 Experts worldwide ranked by ideXlab platform
Hiroki Habazaki - One of the best experts on this subject based on the ideXlab platform.
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two step plasma electrolytic oxidation of ti 15v 3al 3cr 3sn for wear resistant and adhesive coating
2011Co-Authors: S Tsunekawa, Y Aoki, Hiroki HabazakiAbstract:Abstract Ti–15V–3Al–3Cr–3Sn (Ti–15–3) is one of the important practical titanium alloys with high cold deformability and high mechanical strength, but its wear resistance is poor. This paper reports the formation of wear-resistant and adhesive ceramic coatings on Ti–15–3 by two-step plasma electrolytic oxidation (PEO). The PEO of Ti–15–3 has been carried out first in alkaline aluminate Electrolyte to form a wear-resistant oxide layer and then in Acid Electrolyte containing both phosphoric Acid and sulfuric Acid to improve adhesion of the coating. The coating formed in the alkaline aluminate Electrolyte is more than 10 μm thick, and highly crystalline. The main phase is Al2TiO5. This coating shows high wear resistance, but is not adherent to substrate due to the development of a number of voids and pores in the oxide layer close to the substrate. A new oxide layer with amorphous structure is formed next to the substrate in the subsequent PEO in the Acid Electrolyte, during which the voids are filled with a new oxide formed in the Acid Electrolyte, reducing the porosity. As a consequence, the adhesion of the coating is markedly improved without deteriorating the high wear resistance.
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two step plasma electrolytic oxidation of ti 15v 3al 3cr 3sn for wear resistant and adhesive coating
2011Co-Authors: S Tsunekawa, Y Aoki, Hiroki HabazakiAbstract:Abstract Ti–15V–3Al–3Cr–3Sn (Ti–15–3) is one of the important practical titanium alloys with high cold deformability and high mechanical strength, but its wear resistance is poor. This paper reports the formation of wear-resistant and adhesive ceramic coatings on Ti–15–3 by two-step plasma electrolytic oxidation (PEO). The PEO of Ti–15–3 has been carried out first in alkaline aluminate Electrolyte to form a wear-resistant oxide layer and then in Acid Electrolyte containing both phosphoric Acid and sulfuric Acid to improve adhesion of the coating. The coating formed in the alkaline aluminate Electrolyte is more than 10 μm thick, and highly crystalline. The main phase is Al2TiO5. This coating shows high wear resistance, but is not adherent to substrate due to the development of a number of voids and pores in the oxide layer close to the substrate. A new oxide layer with amorphous structure is formed next to the substrate in the subsequent PEO in the Acid Electrolyte, during which the voids are filled with a new oxide formed in the Acid Electrolyte, reducing the porosity. As a consequence, the adhesion of the coating is markedly improved without deteriorating the high wear resistance.
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stress generated porosity in anodic alumina formed in sulphuric Acid Electrolyte
2007Co-Authors: S J Garciavergara, G E Thompson, P Skeldon, Hiroki HabazakiAbstract:Abstract The generation of pores is investigated in anodic films formed at 5 mA cm−2 on aluminium in 0.4 M sulphuric Acid Electrolyte at 293 K. The study follows the behaviour of a fine tungsten tracer layer, initially located in the aluminium, during anodizing. Significantly, the tungsten is incorporated into the anodic film with negligible loss of the tracer to the Electrolyte. The findings indicate that pores develop primarily due to flow of film material in the barrier layer under the influences of the stresses of film growth. The flow of material from beneath pores toward the cell walls is accommodated by the increased thickness of the anodic film relative to that of the oxidized metal by a factor of about 1.35.
S Tsunekawa - One of the best experts on this subject based on the ideXlab platform.
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two step plasma electrolytic oxidation of ti 15v 3al 3cr 3sn for wear resistant and adhesive coating
2011Co-Authors: S Tsunekawa, Y Aoki, Hiroki HabazakiAbstract:Abstract Ti–15V–3Al–3Cr–3Sn (Ti–15–3) is one of the important practical titanium alloys with high cold deformability and high mechanical strength, but its wear resistance is poor. This paper reports the formation of wear-resistant and adhesive ceramic coatings on Ti–15–3 by two-step plasma electrolytic oxidation (PEO). The PEO of Ti–15–3 has been carried out first in alkaline aluminate Electrolyte to form a wear-resistant oxide layer and then in Acid Electrolyte containing both phosphoric Acid and sulfuric Acid to improve adhesion of the coating. The coating formed in the alkaline aluminate Electrolyte is more than 10 μm thick, and highly crystalline. The main phase is Al2TiO5. This coating shows high wear resistance, but is not adherent to substrate due to the development of a number of voids and pores in the oxide layer close to the substrate. A new oxide layer with amorphous structure is formed next to the substrate in the subsequent PEO in the Acid Electrolyte, during which the voids are filled with a new oxide formed in the Acid Electrolyte, reducing the porosity. As a consequence, the adhesion of the coating is markedly improved without deteriorating the high wear resistance.
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two step plasma electrolytic oxidation of ti 15v 3al 3cr 3sn for wear resistant and adhesive coating
2011Co-Authors: S Tsunekawa, Y Aoki, Hiroki HabazakiAbstract:Abstract Ti–15V–3Al–3Cr–3Sn (Ti–15–3) is one of the important practical titanium alloys with high cold deformability and high mechanical strength, but its wear resistance is poor. This paper reports the formation of wear-resistant and adhesive ceramic coatings on Ti–15–3 by two-step plasma electrolytic oxidation (PEO). The PEO of Ti–15–3 has been carried out first in alkaline aluminate Electrolyte to form a wear-resistant oxide layer and then in Acid Electrolyte containing both phosphoric Acid and sulfuric Acid to improve adhesion of the coating. The coating formed in the alkaline aluminate Electrolyte is more than 10 μm thick, and highly crystalline. The main phase is Al2TiO5. This coating shows high wear resistance, but is not adherent to substrate due to the development of a number of voids and pores in the oxide layer close to the substrate. A new oxide layer with amorphous structure is formed next to the substrate in the subsequent PEO in the Acid Electrolyte, during which the voids are filled with a new oxide formed in the Acid Electrolyte, reducing the porosity. As a consequence, the adhesion of the coating is markedly improved without deteriorating the high wear resistance.
Jing Huang - One of the best experts on this subject based on the ideXlab platform.
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investigations on physicochemical properties and electrochemical performance of sulfate chloride mixed Acid Electrolyte for vanadium redox flow battery
2019Co-Authors: Yadong Yang, Yimin Zhang, Li Tang, Jing Huang, Sui Peng, Xiao YangAbstract:Abstract In order to improve the energy density and battery efficiency of vanadium redox flow battery based on sulfate-chloride mixed Acid Electrolyte, the viscosity, conductivity and electrochemical performance of Electrolytes with different concentration compositions are investigated systematically. The viscosity of Electrolytes with four valences both increase with vanadium concentration, sulfate concentration and chloride ion concentration, the conductivity increase with sulfate concentration and chloride ion concentration but decrease with vanadium concentration. The results of electrochemical measurements indicate that the Electrolyte with 2.2 M vanadium concentration, 2.75 M sulfate concentration and 5.8 M chloride ion concentration presents the best electrochemical performance due to common effect of the viscosity, conductivity and active vanadium ion concentration. The battery performance of Electrolytes show that the ohmic polarization, concentration polarization and electrochemical polarization of Electrolytes have great influences on the charging and discharging voltage platform which leads to the change of battery efficiency. In consideration of the improvement of battery efficiency and capacity, the Electrolyte containing 2.2 M vanadium concentration, 2.75 M sulfate concentration and 5.8 M chloride ion concentration is selected as the optimum combination which can provide theoretical direction for the engineering application of vanadium redox flow battery based on sulfate-chloride mixed Acid Electrolyte.
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improved broad temperature adaptability and energy density of vanadium redox flow battery based on sulfate chloride mixed Acid by optimizing the concentration of Electrolyte
2019Co-Authors: Yadong Yang, Yimin Zhang, Jing HuangAbstract:Abstract In order to improve the energy density and broad temperature adaptability of vanadium redox flow battery based on sulfate-chloride mixed Acid Electrolyte, the stability and charge/discharging behavior of Electrolytes at a broad temperature range (-20-50 °C) are investigated systematically. The static stability tests of vanadium ions show that the 2.4 M vanadium concentration can keep stable for 10 days with the Electrolyte composition of chloride ion concentration is 6.0–7.0 M and sulfate concentration is 2.0–3.0 M. However, the static stability tests of chloride ions indicate that volatilization of hydrogen chloride can be avoided when chloride ion concentration is not exceeding 6.4 M. The cell performance of vanadium redox flow battery with optimized Electrolyte compositions indicates that the sulfate-chloride mixed Acid Electrolyte can operate at a wider temperature range and the charge cut-off voltage must be less than 1.7 V to prevent the chlorine evolution. This work not only systematically optimizes the composition of mixed Acid Electrolyte, but also provides theoretical direction to the engineering application of vanadium redox flow battery at extreme environment.
Yadong Yang - One of the best experts on this subject based on the ideXlab platform.
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investigations on physicochemical properties and electrochemical performance of sulfate chloride mixed Acid Electrolyte for vanadium redox flow battery
2019Co-Authors: Yadong Yang, Yimin Zhang, Li Tang, Jing Huang, Sui Peng, Xiao YangAbstract:Abstract In order to improve the energy density and battery efficiency of vanadium redox flow battery based on sulfate-chloride mixed Acid Electrolyte, the viscosity, conductivity and electrochemical performance of Electrolytes with different concentration compositions are investigated systematically. The viscosity of Electrolytes with four valences both increase with vanadium concentration, sulfate concentration and chloride ion concentration, the conductivity increase with sulfate concentration and chloride ion concentration but decrease with vanadium concentration. The results of electrochemical measurements indicate that the Electrolyte with 2.2 M vanadium concentration, 2.75 M sulfate concentration and 5.8 M chloride ion concentration presents the best electrochemical performance due to common effect of the viscosity, conductivity and active vanadium ion concentration. The battery performance of Electrolytes show that the ohmic polarization, concentration polarization and electrochemical polarization of Electrolytes have great influences on the charging and discharging voltage platform which leads to the change of battery efficiency. In consideration of the improvement of battery efficiency and capacity, the Electrolyte containing 2.2 M vanadium concentration, 2.75 M sulfate concentration and 5.8 M chloride ion concentration is selected as the optimum combination which can provide theoretical direction for the engineering application of vanadium redox flow battery based on sulfate-chloride mixed Acid Electrolyte.
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improved broad temperature adaptability and energy density of vanadium redox flow battery based on sulfate chloride mixed Acid by optimizing the concentration of Electrolyte
2019Co-Authors: Yadong Yang, Yimin Zhang, Jing HuangAbstract:Abstract In order to improve the energy density and broad temperature adaptability of vanadium redox flow battery based on sulfate-chloride mixed Acid Electrolyte, the stability and charge/discharging behavior of Electrolytes at a broad temperature range (-20-50 °C) are investigated systematically. The static stability tests of vanadium ions show that the 2.4 M vanadium concentration can keep stable for 10 days with the Electrolyte composition of chloride ion concentration is 6.0–7.0 M and sulfate concentration is 2.0–3.0 M. However, the static stability tests of chloride ions indicate that volatilization of hydrogen chloride can be avoided when chloride ion concentration is not exceeding 6.4 M. The cell performance of vanadium redox flow battery with optimized Electrolyte compositions indicates that the sulfate-chloride mixed Acid Electrolyte can operate at a wider temperature range and the charge cut-off voltage must be less than 1.7 V to prevent the chlorine evolution. This work not only systematically optimizes the composition of mixed Acid Electrolyte, but also provides theoretical direction to the engineering application of vanadium redox flow battery at extreme environment.
Y Aoki - One of the best experts on this subject based on the ideXlab platform.
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two step plasma electrolytic oxidation of ti 15v 3al 3cr 3sn for wear resistant and adhesive coating
2011Co-Authors: S Tsunekawa, Y Aoki, Hiroki HabazakiAbstract:Abstract Ti–15V–3Al–3Cr–3Sn (Ti–15–3) is one of the important practical titanium alloys with high cold deformability and high mechanical strength, but its wear resistance is poor. This paper reports the formation of wear-resistant and adhesive ceramic coatings on Ti–15–3 by two-step plasma electrolytic oxidation (PEO). The PEO of Ti–15–3 has been carried out first in alkaline aluminate Electrolyte to form a wear-resistant oxide layer and then in Acid Electrolyte containing both phosphoric Acid and sulfuric Acid to improve adhesion of the coating. The coating formed in the alkaline aluminate Electrolyte is more than 10 μm thick, and highly crystalline. The main phase is Al2TiO5. This coating shows high wear resistance, but is not adherent to substrate due to the development of a number of voids and pores in the oxide layer close to the substrate. A new oxide layer with amorphous structure is formed next to the substrate in the subsequent PEO in the Acid Electrolyte, during which the voids are filled with a new oxide formed in the Acid Electrolyte, reducing the porosity. As a consequence, the adhesion of the coating is markedly improved without deteriorating the high wear resistance.
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two step plasma electrolytic oxidation of ti 15v 3al 3cr 3sn for wear resistant and adhesive coating
2011Co-Authors: S Tsunekawa, Y Aoki, Hiroki HabazakiAbstract:Abstract Ti–15V–3Al–3Cr–3Sn (Ti–15–3) is one of the important practical titanium alloys with high cold deformability and high mechanical strength, but its wear resistance is poor. This paper reports the formation of wear-resistant and adhesive ceramic coatings on Ti–15–3 by two-step plasma electrolytic oxidation (PEO). The PEO of Ti–15–3 has been carried out first in alkaline aluminate Electrolyte to form a wear-resistant oxide layer and then in Acid Electrolyte containing both phosphoric Acid and sulfuric Acid to improve adhesion of the coating. The coating formed in the alkaline aluminate Electrolyte is more than 10 μm thick, and highly crystalline. The main phase is Al2TiO5. This coating shows high wear resistance, but is not adherent to substrate due to the development of a number of voids and pores in the oxide layer close to the substrate. A new oxide layer with amorphous structure is formed next to the substrate in the subsequent PEO in the Acid Electrolyte, during which the voids are filled with a new oxide formed in the Acid Electrolyte, reducing the porosity. As a consequence, the adhesion of the coating is markedly improved without deteriorating the high wear resistance.
