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Fuhui Wang - One of the best experts on this subject based on the ideXlab platform.
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oxidatIon behavior of nicraly coatings prepared by arc Ion Plating using various substrate biases effects of chemical compositIon and thickness of the coatings
Corrosion Science, 2017Co-Authors: Panpan Zhao, Mingli Shen, Shenglong Zhu, Fuhui WangAbstract:Abstract NiCrAlY coatings with various Cr and Al contents were prepared on Ni-based superalloy K438G from a single NiCrAlY target by adjusting the substrate bias during high vacuum arc Ion Plating. The oxidatIon behavior of the coatings follows the oxide map laws proposed by Wallwork and Hed rather than the guide line based on Cr/Al = 4. As the coatings degrade due to Al depletIon, formatIon of Cr 2 O 3 scales beneath the external α-Al 2 O 3 scales was observed. The mechanism for the oxidatIon of Ni-Cr-Al alloys is discussed.
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high vacuum arc Ion Plating tial coatings for protecting titanium alloy against oxidatIon at medium high temperatures
Corrosion Science, 2016Co-Authors: Mingli Shen, Shenglong Zhu, Mingming Zhang, Li Xin, Xueyong Ding, Fuhui WangAbstract:Abstract High vacuum arc Ion Plating TiAl coatings are explored for protecting titanium alloys against oxidatIon at temperatures below 700 °C. Bi-phased TiAl coatings which are composed of γ-TiAl + α 2 -Ti 3 Al were obtained under the substrate bias range of 0 V to −350 V, which formed Al 2 O 3 -rich oxide layers during oxidatIon. Higher bias induced slight decrease of Al content but dramatically densified the microstructure of the coating, resulting in improved oxidatIon resistance of the TiAl coatings. Meanwhile, no detrimental interdiffusIon phase was observed after oxidatIon for 100 h, showing good protectiveness of the TiAl coatings.
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high vacuum arc Ion Plating nicraly coatings bias effect and approach to preparatIon of functIonal gradient coatings
Surface & Coatings Technology, 2015Co-Authors: Panpan Zhao, Mingli Shen, Shenglong Zhu, Fuhui WangAbstract:Abstract The substrate bias effects on high vacuum arc Ion Plating (HV-AIP) of NiCrAlY coatings on superalloy were investigated at the vacuum level of 10− 3–10− 4 Pa, which are 2–3 orders in magnitude better than that of conventIonal low vacuum arc Ion Plating (LV-AIP). The negative bias applied to the substrate was in the range of − 50 V to − 450 V. Microstructures, depositIon rates, and chemical compositIons of the coatings are significantly influenced by the negative bias. Except for commonly observed bias induced densificatIon in microstructure and decrease in depositIon rate, strong preferential sputtering effect at high bias was observed. The sputtering yield for Cr was estimated to be ranged from ~ 0.1 to ~ 0.2 at bias from − 50 V to − 450 V, while those for Ni and Al were from ~ 0.1 to 1.5. As a result, the major phase constitutIon of the coatings changed from γ-Ni/γ′-Ni3Al phases at bias of − 50 V to α-Cr phase at bias of − 450 V. Such stronger preferential sputtering effect in HV-AIP fosters a strategy for preparing compositIonally gradient NiCrAlY coatings just by control of the substrate bias without the need of further treatments or multi-targets. Based on this concept, preparatIon of several types of gradient NiCrAlY coatings with great flexibilities by one target and one process was demonstrated.
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high vacuum arc Ion Plating nicraly coatings microstructure and oxidatIon behavior
Corrosion Science, 2015Co-Authors: Mingli Shen, Panpan Zhao, Shenglong Zhu, Fuhui WangAbstract:Abstract High vacuum (HV) arc Ion Plating (AIP) was developed for depositing NiCrAlY coatings at vacuum levels of 10 −3 –10 −4 Pa, which are 2–3 orders in magnitude better than that of conventIonal low vacuum (LV) AIP. Microstructure and oxidatIon behavior of the NiCrAlY coatings prepared by HV- and LV-AIP were comparatively investigated. As compared with the LV coatings, the HV coatings showed dramatically lower porosity and better oxidatIon resistance by forming purer alumina scales during oxidatIon. The significant improvements are considered to be attributed to that HV facilitated forming denser NiCrAlY coatings and eliminating gas inclusIons in the coating.
Chao Sun - One of the best experts on this subject based on the ideXlab platform.
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tialn cu nanocomposite coatings deposited by filtered cathodic arc Ion Plating
Journal of Materials Science & Technology, 2017Co-Authors: Lei Chen, Z.l. Pei, Jinquan Xiao, Jun Gong, Chao SunAbstract:TiAlN/Cu nanocomposite coatings with Cu concentratIon of 0–1.4 at.% were deposited on the high-speed steel (HSS) substrates by filtered cathodic arc Ion Plating technique. The chemical compositIon, microstructure, morphology, adhesIon strength, mechanical and tribological properties of the TiAlN/Cu coatings were characterized and analyzed. The results reveal that the coating structure and properties depend on not only the Cu concentratIon, but also the depositIon conditIon. The additIon of Cu significantly decreases the grain size and weakens the texture in the TiAlN/Cu coatings. With increasing the Cu concentratIon, the coating hardness decreases slightly from 30.7 GPa of the pure TiAlN coating to 28.5 GPa of the TiAlN/Cu coating with 1.4 at.% Cu. All the TiAlN/Cu coatings present sufficient adhesIon strength. In additIon, the existing state of additive Cu in the TiAlN/Cu coatings is also investigated.
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effects of the thickness ratio of crn vs cr2o3 layer on the properties of double layered crn cr2o3 coatings deposited by arc Ion Plating
Journal of Materials Science & Technology, 2014Co-Authors: Changming Shi, Z.l. Pei, Jun Gong, Tiegang Wang, Chao SunAbstract:In this study, CrN/Cr2O3 double-layered coatings with various thickness ratios of CrN vs Cr2O3 layer were prepared by arc Ion Plating technology. The influences of the thickness ratio of CrN vs Cr2O3 layer on the microstructural characteristics as well as the mechanical and tribological properties of the CrN/Cr2O3 double-layered coatings were investigated. The corresponding mechanisms were also discussed. The results indicated that the insertIon of CrN layer between the Cr2O3 layer and substrate can effectively decrease the internal stress level of the coating. With increasing the thickness ratio of CrN vs Cr2O3 layer, the surface roughness of double-layered coatings decreased gradually, which had a certain influence on the frictIon coefficient. In additIon, the microhardness also declined gradually, the adhesive strength almost increased linearly, whereas the wear rate declined firstly and then increased slightly. As the thickness ratio was 2:1, the double-layered coating exhibited the best wear resistance.
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method for Plating inner surface of long tube through arc Ion Plating with magnetic field and electric field enhancement
2012Co-Authors: Yanhui Zhao, Baohai Yu, Jinquan Xiao, Hao Du, Weigang Hua, Gong Jun, Chao SunAbstract:The inventIon which belongs to the field of material surface modificatIon relates to a method for Plating the inner surface of a long tube through arc Ion Plating with magnetic field and electric field enhancement. The method is characterized in that: the movement locus of a plasma beam is constrained and controlled by a magnetic field in the process of arc Ion Plating, two sets of magnetic fieldgeneratIon apparatuses are arranged in an arc Ion Plating depositIon apparatus, one set is arranged on a plasma transmissIon channel outside a vacuum chamber, the plasma beam is focused with the magnetic field to constrain the cross sectIon diameter and the transmissIon efficiency of the plasma beam in transmissIon, and the other set is arranged on the outer side of a tubular workpiece in the vacuum chamber to guide the plasma beam to diffuse along the axial directIon of the center of the tubular workpiece; and electric field enhancement is utilized in the arc Ion Plating because the electricfield allows the accelerated directIonal flow of the plasma to be realized, and the electric field enhancement is realized through arranging a pulse electric field in the workpiece. By utilizing the constraint and the control of the magnetic field and the electric field to the plasma beam, a purpose that the plasma deposites the film on the inner surface of the tube is realized, so the method is suitable for Plating the inner surface of tubular workpieces which is used as a service surface.
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oxidatIon of a nicralysi overlayer with or without a diffusIon barrier deposited by one step arc Ion Plating
Corrosion Science, 2010Co-Authors: Qisheng Wang, Chao Sun, Xin JiangAbstract:The coating systems of a NiCrAlYSi overlayer with or without a diffusIon barrier (DB) were deposited by one-step arc Ion Plating (AIP). Isothermal and cyclic oxidatIons were performed at 1050 degrees C for 100 h and 100 cycles, respectively. The results indicate that the duplex coating system exhibits a more effective protectIon for the substrate, where thin and continuous scales are adhered to the overlayer surface, and very limited oxidatIon and interdiffusIon attacks are detected. After exposure for 100 h or 100 cycles, the DB is stable and efficient. The oxidatIon resistance mechanism for the two coating systems is discussed. (C) 2010 Elsevier Ltd. All rights reserved.
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isothermal oxidatIon behaviour of a gradient nicocralsiy coating deposited by arc Ion Plating on a ni based single crystal superalloy
Corrosion Science, 2009Co-Authors: S M Jiang, Jun Gong, Zebin Bao, Chao SunAbstract:A gradient NiCoCrAlSiY coating consisting of Al-enriched outer zone and Cr-enriched internal zone was prepared using arc Ion Plating method and subsequent annealing treatment. Isothermal oxidatIons were performed at 1000 degrees C and 1100 degrees C in static air. The results confirmed an enhanced performance for the gradient NiCoCrAISiY coating in contrast to the conventIonal NiCoCrAlSiY, due to the high-Al content and the in-situ Cr(Re, W)-rich diffusIon barrier which exists in the gradient coating. The degradatIon mechanisms for the two coatings and the formatIon mechanism for the diffusIon barrier are discussed. (C) 2009 Elsevier Ltd. All rights reserved.
Jun Gong - One of the best experts on this subject based on the ideXlab platform.
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tialn cu nanocomposite coatings deposited by filtered cathodic arc Ion Plating
Journal of Materials Science & Technology, 2017Co-Authors: Lei Chen, Z.l. Pei, Jinquan Xiao, Jun Gong, Chao SunAbstract:TiAlN/Cu nanocomposite coatings with Cu concentratIon of 0–1.4 at.% were deposited on the high-speed steel (HSS) substrates by filtered cathodic arc Ion Plating technique. The chemical compositIon, microstructure, morphology, adhesIon strength, mechanical and tribological properties of the TiAlN/Cu coatings were characterized and analyzed. The results reveal that the coating structure and properties depend on not only the Cu concentratIon, but also the depositIon conditIon. The additIon of Cu significantly decreases the grain size and weakens the texture in the TiAlN/Cu coatings. With increasing the Cu concentratIon, the coating hardness decreases slightly from 30.7 GPa of the pure TiAlN coating to 28.5 GPa of the TiAlN/Cu coating with 1.4 at.% Cu. All the TiAlN/Cu coatings present sufficient adhesIon strength. In additIon, the existing state of additive Cu in the TiAlN/Cu coatings is also investigated.
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effects of the thickness ratio of crn vs cr2o3 layer on the properties of double layered crn cr2o3 coatings deposited by arc Ion Plating
Journal of Materials Science & Technology, 2014Co-Authors: Changming Shi, Z.l. Pei, Jun Gong, Tiegang Wang, Chao SunAbstract:In this study, CrN/Cr2O3 double-layered coatings with various thickness ratios of CrN vs Cr2O3 layer were prepared by arc Ion Plating technology. The influences of the thickness ratio of CrN vs Cr2O3 layer on the microstructural characteristics as well as the mechanical and tribological properties of the CrN/Cr2O3 double-layered coatings were investigated. The corresponding mechanisms were also discussed. The results indicated that the insertIon of CrN layer between the Cr2O3 layer and substrate can effectively decrease the internal stress level of the coating. With increasing the thickness ratio of CrN vs Cr2O3 layer, the surface roughness of double-layered coatings decreased gradually, which had a certain influence on the frictIon coefficient. In additIon, the microhardness also declined gradually, the adhesive strength almost increased linearly, whereas the wear rate declined firstly and then increased slightly. As the thickness ratio was 2:1, the double-layered coating exhibited the best wear resistance.
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study on nanocomposite ti al si cu n films with various si contents deposited by cathodic vacuum arc Ion Plating
Applied Surface Science, 2012Co-Authors: Jun Gong, Xin Jiang, Jing Shi, C M Muders, Aditya Kumar, Zhiguo Pei, Chunshui SunAbstract:In this study, nanocomposite Ti-Al-Si-Cu-N films were deposited on high speed steel substrates by the vacuum cathode arc Ion Plating (AIP) technique. By virtue of X-ray diffractIon (XRD) analysis, X-ray photoelectron spectroscopy (XPS), and field emissIon scanning electron microscopy (FESEM), the influence of silicon content on the film microstructure and characteristics was investigated systematically, including the chemical compositIon, crystalline structure as well as cross-sectIon morphologies. With increasing the silicon content, a deterioratIon of the preferred orientatIon and a dense globular structure were detected. In the meanwhile, atomic force microscopy (AFM), nano-indentatIon, Rockwell indenter and reciprocating test were also utilized to analyze the hardness, elastic modulus, H-3/E-2, frictIon coefficient, adhesive strength and wear rate of the Ti-Al-Si-Cu-N films. The results showed that an optimal silicon content correlated with the best mechanical and tribological properties of the presented Ti-Al-Si-Cu-N films existed. With increasing the silicon content, the hardness, elastic modulus and the ratio H-3/E-2 first were improved gradually, and then were impaired sharply again. When the silicon content reached to 6 at.%, the film possessed the highest hardness, elastic modulus and ratio H-3/E-2 of approximately 24 GPa, 218 GPa and 0.31, respectively. Besides, films containing both 6 at.% and 10 at.% Si contents obtained a relatively low frictIon coefficient and a good adhesive strength. The wear rate decreased with an increase in hardness, with the highest hardness corresponding to a wear rate around 1.3 x 10(-5)mm(3)/(N m) of the film with 6 at.% Si content. The correlatIons between hardness and tribological properties for the films were also examined. The essence of above phenomena was attributed to the variatIons of microstructure and morphologies in the films induced by the increasing silicon content. (C) 2012 Elsevier B. V. All rights reserved.
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effects of nitrogen pressure and pulse bias voltage on the properties of cr n coatings deposited by arc Ion Plating
Surface & Coatings Technology, 2010Co-Authors: Sumei Zhao, Yeran Yang, Jun GongAbstract:Cr-N coatings were deposited on 1Cr18Ni9Ti stainless steel in the pure N(2) atmosphere by arc Ion Plating (AIP). The relatIonships between depositIon parameters and coating properties were investigated. X-ray diffractIon showed a phase transformatIon from CrN+Cr(2)N+Cr-->CrN+Cr-->CrN and the CrN preferred orientatIon changed from (200) to (220) as N(2) pressure increased. Increasing bias voltage led to CrN preferred orientatIon changed from (200) to (220) and the formatIon of Cr(2)N. XPS results indicated that chemical compositIon of the coatings changed as N(2) pressure increased but it changed little with bias voltage. The lower melting point of chromium nitride formed on target surface induced the increase of macroparticles and depositIon rate with increasing N(2) pressure; and bias voltage had an obvious effect on reducing macroparticles of the Cr-N coatings. Residual stresses were measured by substrate curvature technique, and the changing tendency coincided with the microhardness of the coatings. (C) 2009 Elsevier B.V. All rights reserved.
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isothermal oxidatIon behaviour of a gradient nicocralsiy coating deposited by arc Ion Plating on a ni based single crystal superalloy
Corrosion Science, 2009Co-Authors: S M Jiang, Jun Gong, Zebin Bao, Chao SunAbstract:A gradient NiCoCrAlSiY coating consisting of Al-enriched outer zone and Cr-enriched internal zone was prepared using arc Ion Plating method and subsequent annealing treatment. Isothermal oxidatIons were performed at 1000 degrees C and 1100 degrees C in static air. The results confirmed an enhanced performance for the gradient NiCoCrAISiY coating in contrast to the conventIonal NiCoCrAlSiY, due to the high-Al content and the in-situ Cr(Re, W)-rich diffusIon barrier which exists in the gradient coating. The degradatIon mechanisms for the two coatings and the formatIon mechanism for the diffusIon barrier are discussed. (C) 2009 Elsevier Ltd. All rights reserved.
Mingli Shen - One of the best experts on this subject based on the ideXlab platform.
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oxidatIon behavior of nicraly coatings prepared by arc Ion Plating using various substrate biases effects of chemical compositIon and thickness of the coatings
Corrosion Science, 2017Co-Authors: Panpan Zhao, Mingli Shen, Shenglong Zhu, Fuhui WangAbstract:Abstract NiCrAlY coatings with various Cr and Al contents were prepared on Ni-based superalloy K438G from a single NiCrAlY target by adjusting the substrate bias during high vacuum arc Ion Plating. The oxidatIon behavior of the coatings follows the oxide map laws proposed by Wallwork and Hed rather than the guide line based on Cr/Al = 4. As the coatings degrade due to Al depletIon, formatIon of Cr 2 O 3 scales beneath the external α-Al 2 O 3 scales was observed. The mechanism for the oxidatIon of Ni-Cr-Al alloys is discussed.
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high vacuum arc Ion Plating tial coatings for protecting titanium alloy against oxidatIon at medium high temperatures
Corrosion Science, 2016Co-Authors: Mingli Shen, Shenglong Zhu, Mingming Zhang, Li Xin, Xueyong Ding, Fuhui WangAbstract:Abstract High vacuum arc Ion Plating TiAl coatings are explored for protecting titanium alloys against oxidatIon at temperatures below 700 °C. Bi-phased TiAl coatings which are composed of γ-TiAl + α 2 -Ti 3 Al were obtained under the substrate bias range of 0 V to −350 V, which formed Al 2 O 3 -rich oxide layers during oxidatIon. Higher bias induced slight decrease of Al content but dramatically densified the microstructure of the coating, resulting in improved oxidatIon resistance of the TiAl coatings. Meanwhile, no detrimental interdiffusIon phase was observed after oxidatIon for 100 h, showing good protectiveness of the TiAl coatings.
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high vacuum arc Ion Plating nicraly coatings bias effect and approach to preparatIon of functIonal gradient coatings
Surface & Coatings Technology, 2015Co-Authors: Panpan Zhao, Mingli Shen, Shenglong Zhu, Fuhui WangAbstract:Abstract The substrate bias effects on high vacuum arc Ion Plating (HV-AIP) of NiCrAlY coatings on superalloy were investigated at the vacuum level of 10− 3–10− 4 Pa, which are 2–3 orders in magnitude better than that of conventIonal low vacuum arc Ion Plating (LV-AIP). The negative bias applied to the substrate was in the range of − 50 V to − 450 V. Microstructures, depositIon rates, and chemical compositIons of the coatings are significantly influenced by the negative bias. Except for commonly observed bias induced densificatIon in microstructure and decrease in depositIon rate, strong preferential sputtering effect at high bias was observed. The sputtering yield for Cr was estimated to be ranged from ~ 0.1 to ~ 0.2 at bias from − 50 V to − 450 V, while those for Ni and Al were from ~ 0.1 to 1.5. As a result, the major phase constitutIon of the coatings changed from γ-Ni/γ′-Ni3Al phases at bias of − 50 V to α-Cr phase at bias of − 450 V. Such stronger preferential sputtering effect in HV-AIP fosters a strategy for preparing compositIonally gradient NiCrAlY coatings just by control of the substrate bias without the need of further treatments or multi-targets. Based on this concept, preparatIon of several types of gradient NiCrAlY coatings with great flexibilities by one target and one process was demonstrated.
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high vacuum arc Ion Plating nicraly coatings microstructure and oxidatIon behavior
Corrosion Science, 2015Co-Authors: Mingli Shen, Panpan Zhao, Shenglong Zhu, Fuhui WangAbstract:Abstract High vacuum (HV) arc Ion Plating (AIP) was developed for depositing NiCrAlY coatings at vacuum levels of 10 −3 –10 −4 Pa, which are 2–3 orders in magnitude better than that of conventIonal low vacuum (LV) AIP. Microstructure and oxidatIon behavior of the NiCrAlY coatings prepared by HV- and LV-AIP were comparatively investigated. As compared with the LV coatings, the HV coatings showed dramatically lower porosity and better oxidatIon resistance by forming purer alumina scales during oxidatIon. The significant improvements are considered to be attributed to that HV facilitated forming denser NiCrAlY coatings and eliminating gas inclusIons in the coating.
Shenglong Zhu - One of the best experts on this subject based on the ideXlab platform.
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oxidatIon behavior of nicraly coatings prepared by arc Ion Plating using various substrate biases effects of chemical compositIon and thickness of the coatings
Corrosion Science, 2017Co-Authors: Panpan Zhao, Mingli Shen, Shenglong Zhu, Fuhui WangAbstract:Abstract NiCrAlY coatings with various Cr and Al contents were prepared on Ni-based superalloy K438G from a single NiCrAlY target by adjusting the substrate bias during high vacuum arc Ion Plating. The oxidatIon behavior of the coatings follows the oxide map laws proposed by Wallwork and Hed rather than the guide line based on Cr/Al = 4. As the coatings degrade due to Al depletIon, formatIon of Cr 2 O 3 scales beneath the external α-Al 2 O 3 scales was observed. The mechanism for the oxidatIon of Ni-Cr-Al alloys is discussed.
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high vacuum arc Ion Plating tial coatings for protecting titanium alloy against oxidatIon at medium high temperatures
Corrosion Science, 2016Co-Authors: Mingli Shen, Shenglong Zhu, Mingming Zhang, Li Xin, Xueyong Ding, Fuhui WangAbstract:Abstract High vacuum arc Ion Plating TiAl coatings are explored for protecting titanium alloys against oxidatIon at temperatures below 700 °C. Bi-phased TiAl coatings which are composed of γ-TiAl + α 2 -Ti 3 Al were obtained under the substrate bias range of 0 V to −350 V, which formed Al 2 O 3 -rich oxide layers during oxidatIon. Higher bias induced slight decrease of Al content but dramatically densified the microstructure of the coating, resulting in improved oxidatIon resistance of the TiAl coatings. Meanwhile, no detrimental interdiffusIon phase was observed after oxidatIon for 100 h, showing good protectiveness of the TiAl coatings.
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high vacuum arc Ion Plating nicraly coatings bias effect and approach to preparatIon of functIonal gradient coatings
Surface & Coatings Technology, 2015Co-Authors: Panpan Zhao, Mingli Shen, Shenglong Zhu, Fuhui WangAbstract:Abstract The substrate bias effects on high vacuum arc Ion Plating (HV-AIP) of NiCrAlY coatings on superalloy were investigated at the vacuum level of 10− 3–10− 4 Pa, which are 2–3 orders in magnitude better than that of conventIonal low vacuum arc Ion Plating (LV-AIP). The negative bias applied to the substrate was in the range of − 50 V to − 450 V. Microstructures, depositIon rates, and chemical compositIons of the coatings are significantly influenced by the negative bias. Except for commonly observed bias induced densificatIon in microstructure and decrease in depositIon rate, strong preferential sputtering effect at high bias was observed. The sputtering yield for Cr was estimated to be ranged from ~ 0.1 to ~ 0.2 at bias from − 50 V to − 450 V, while those for Ni and Al were from ~ 0.1 to 1.5. As a result, the major phase constitutIon of the coatings changed from γ-Ni/γ′-Ni3Al phases at bias of − 50 V to α-Cr phase at bias of − 450 V. Such stronger preferential sputtering effect in HV-AIP fosters a strategy for preparing compositIonally gradient NiCrAlY coatings just by control of the substrate bias without the need of further treatments or multi-targets. Based on this concept, preparatIon of several types of gradient NiCrAlY coatings with great flexibilities by one target and one process was demonstrated.
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high vacuum arc Ion Plating nicraly coatings microstructure and oxidatIon behavior
Corrosion Science, 2015Co-Authors: Mingli Shen, Panpan Zhao, Shenglong Zhu, Fuhui WangAbstract:Abstract High vacuum (HV) arc Ion Plating (AIP) was developed for depositing NiCrAlY coatings at vacuum levels of 10 −3 –10 −4 Pa, which are 2–3 orders in magnitude better than that of conventIonal low vacuum (LV) AIP. Microstructure and oxidatIon behavior of the NiCrAlY coatings prepared by HV- and LV-AIP were comparatively investigated. As compared with the LV coatings, the HV coatings showed dramatically lower porosity and better oxidatIon resistance by forming purer alumina scales during oxidatIon. The significant improvements are considered to be attributed to that HV facilitated forming denser NiCrAlY coatings and eliminating gas inclusIons in the coating.
