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Christian Coddet - One of the best experts on this subject based on the ideXlab platform.
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Correction to: Effect of Dry-Ice Blasting on Structure and Magnetic Properties of Plasma-Sprayed Fe-40Al Coating from Nanostructured Powders
Journal of Thermal Spray Technology, 2019Co-Authors: Bo Song, BERNARD HANSZ, Shujuan Dong, Hanlin Liao, Christian CoddetAbstract:The authors erroneously omitted.
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Deposition of NiCrBSi coatings by atmospheric plasma spraying and Dry-Ice Blasting: Microstructure and wear resistance
Surface and Coatings Technology, 2015Co-Authors: Shujuan Dong, H B Liao, Bo Song, Christian CoddetAbstract:Atmospheric plasma spraying (APS) offers a wide range of coatings with very different compositions and properties. Special attention has been paid to NiCrBSi alloys, as promising alternatives to hard chromium plating due to their high wear and corrosion resistance at high temperatures. In this study, Dry-Ice Blasting was combined simultaneously with plasma spraying in order to modify the characteristics of metal alloy coatings. A microstructural and tribological comparison between NiCrBSi coatings obtained by conventional APS and those via Dry-Ice Blasting is carried out. The main wear mechanisms are investigated by the characterization of the wear track and debris using scanning electron microscopy (SEM). It can be observed that coatings using Dry-Ice Blasting consisted of NiCrBSi splats with better flattening and higher percentage of amorphous phase. Oxidation is the main wear mechanism for both coatings. Material transfer takes place between the 100Cr6 ball and the NiCrBSi coating. Better tribological behavior was observed for Dry-Ice blasted NiCrBSi coatings at diverse sliding velocities.
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Dielectric properties of Al_2O_3 coatings deposited via atmospheric plasma spraying and Dry-Ice Blasting correlated with microstructural characteristics
Applied Physics A, 2015Co-Authors: Shujuan Dong, Bo Song, Hanlin Liao, Christian CoddetAbstract:In this work, atmospheric plasma spraying combined with Dry-Ice Blasting have been used to prepare alumina (Al_2O_3) coatings designed for insulating applications. The microstructural characteristics and dielectric properties of Al_2O_3 coatings were presented. The electrical insulating properties, i.e., dielectric strength and breakdown voltage, were investigated by dielectric breakdown test using direct current and alternating current. Relationships between dielectric properties and coating characteristics were discussed. The results showed that Dry-Ice Blasting used during atmospheric plasma spray process allowed the production of coatings with better dielectric properties than those prepared without Dry-Ice Blasting. The dielectric properties were correlated with the microstructural characteristics, not with phase composition.
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Effect of Dry-Ice Blasting on the deposition behavior of molybdenum particles onto aluminum and stainless steel substrates using plasma spraying: From single splat to coating
Surface and Coatings Technology, 2015Co-Authors: Shujuan Dong, H B Liao, Bo Song, Christian CoddetAbstract:Molybdenum splats usually exhibit splitting morphology onto aluminum and stainless steel substrates due to substrate melting and their own high surface tension using plasma spraying. In this study, Mo particles were sprayed onto different substrates, which were treated by Dry-Ice Blasting combined with substrate preheating. The splats were studied using detailed microstructural characterization with an emphasis on the splat shape. Moreover, the corresponding Mo coatings deposited onto different substrates were obtained. The results showed that the splitting splat formed on stainless steel was different from that on the aluminum surface. Dry-Ice Blasting combined with substrate preheating slightly modify the morphology of Mo splat sprayed on aluminum and stainless steel surfaces.
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suppression effect of decarburization by Dry Ice Blasting on plasma sprayed steel coatings structure wear performance and magnetic properties
Surface & Coatings Technology, 2014Co-Authors: Bo Song, BERNARD HANSZ, Shujuan Dong, Hanlin Liao, Christian CoddetAbstract:Abstract Steel coatings prepared by atmospheric thermal spraying with Dry-Ice Blasting were studied in terms of phase structure, magnetic and wear behaviors. It was found that Dry-Ice Blasting could suppress the volatilization of carbon during spraying process due to the exclusion effect of carbon dioxide gas sublimated from Dry-Ice pellets on the oxygen. Moreover, the fractographic observation of the deposited coatings proved the removal effect of Dry-Ice Blasting on the splashing particulates which were distributed with poor bonding strength between the splat layers. In addition, it has been found that the magnetic properties are sensitive to the direction in the coating, although steel coating presents a ferromagnetic character in the parallel and vertical directions. Steel coating deposited with Dry-Ice Blasting possesses a relatively lower saturation magnetization but has a superior wear resistance because of the suppression of decarburization during the spraying process.
Shujuan Dong - One of the best experts on this subject based on the ideXlab platform.
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Correction to: Effect of Dry-Ice Blasting on Structure and Magnetic Properties of Plasma-Sprayed Fe-40Al Coating from Nanostructured Powders
Journal of Thermal Spray Technology, 2019Co-Authors: Bo Song, BERNARD HANSZ, Shujuan Dong, Hanlin Liao, Christian CoddetAbstract:The authors erroneously omitted.
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Duplex and functionally graded Al@NiCr/8YSZ thermal barrier coatings on aluminum substrates
Journal of Alloys and Compounds, 2019Co-Authors: Panpan Liang, Shujuan Dong, Jinyan Zeng, Xiong Yang, Hao Zhang, Jianing Jiang, Longhui Deng, Xin ZhouAbstract:Abstract It is difficult to prepare non-ablative thermal barrier coatings (TBCs) on aluminum alloy owing to the sensitivity to oxygen and low melting temperature of the substrate and great difference of thermal expansion coefficient between the substrate and the coatings. In this work, the cladding-structured Al@NiCr was deposited as interlayer between the aluminum alloy substrate and the 8YSZ topcoat to enhance the bonding strength of TBCs. To avoid the oxidation of the bond coat and the substrate, different cooling systems were attempted. Al@NiCr/8YSZ functionally graded (FG) coatings were also designed and prepared on the aluminum alloy substrate. Microstructure, bonding strength and thermal cycling behavior were investigated and compared with the duplex TBCs. The results showed that selective oxidation of aluminum and chromium occurred for plasma-sprayed Al@NiCr interlayer, similar to traditional NiCrAlY bond coat. The aluminum oxides still wrap around NiCr splats in the coatings. With the application of Dry-Ice Blasting, Al@NiCr interlayer presents more significant decrease in the porosity and the oxides than traditional NiCrAlY as well as more improvement in the bonding strength. Al@NiCr/8YSZ FG coatings have incremental density from ceramic to metal side and uniform layer density. The bonding strength of FG coatings was about twIce as higher as that of the duplex ones. Al@NiCr/8YSZ TBCs on the aluminum alloy substrates exhibit an excellent thermal cycling lifetime.
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Lanthanum magnesium hexaluminate thermal barrier coatings with pre-implanted vertical microcracks: Thermal cycling lifetime and CMAS corrosion behaviour
Ceramics International, 2018Co-Authors: Jinyan Zeng, Shujuan Dong, Xiong Yang, Hao Zhang, Peifan Zhou, Xin ZhouAbstract:Abstract Atmospheric plasma-sprayed (APS) coatings have a layered structure as well as lower strain tolerance and a shorter lifetime than EB-PVD coatings. In this study, TBCs composed of a LaMgAl11O19 (LMA) top coat and a NiCrAlY bond coat were prepared by APS coupled with Dry-Ice Blasting to implant vertical microcracks in the top coat. The thermal cycling lifetime and CMAS corrosion behaviour of LMA-TBCs with pre-implanted vertical microcracks were investigated in detail. The results show that the LMA top coat possesses an improved proportion of vertical microcracks and that the corresponding TBC has an improved thermal cycling lifetime. The vertical microcracks in the top coats, which not only reduce the thermal stress but also improve the strain tolerance of TBCs, dramatically contribute to the improvement in the thermal cycling lifetime. Surprisingly, the CMAS corrosion resistance of LMA-type TBCs with implanted vertical microcracks is better than that of conventional TBCs with a typical layered structure.
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Correlation between microstructure, chemical components and tribological properties of plasma-sprayed Cr2O3-based coatings
Ceramics International, 2018Co-Authors: Xiong Yang, Shujuan Dong, Jinyan Zeng, Hao Zhang, Jianing Jiang, Longhui Deng, Jinshuang Wang, Xin ZhouAbstract:Abstract The wear resistance of chromium oxide (Cr 2 O 3 ) coatings could be improved by doping modification and changing the structural scale, etc. In this study, micrometric Cr 2 O 3 coatings were doped with different additives, CeO 2 and Nb 2 O 5 . Moreover, Cr 2 O 3 coatings were deposited from nanostructured feedstock by the combination process of plasma spraying and Dry-Ice Blasting. The correlation between the microstructure, chemical components and tribological properties of plasma-sprayed Cr 2 O 3 -based coatings was discussed based on the investigation of their porosity, hardness and friction behaviors. The results showed that the composite coatings doped with additives exhibited a higher microhardness, corresponding to a lower porosity than pure Cr 2 O 3 coating under the identical plasma-spray condition. CeO 2 constituent was found to improve the wear resistance of Cr 2 O 3 coating while Nb 2 O 5 incorporation corresponds to a steep rise in the friction coefficient. The mismatch of coefficient of thermal expansion (CTE) between Cr 2 O 3 and Nb 2 O 5 lamellae facilitated the origin of fatigue cracks and the formation of microfracture pits. Although the combination process promotes a porosity reduction, the nanostructured Cr 2 O 3 (n-Cr 2 O 3 ) coatings present a lower microhardness than micrometric coatings, due to their loosen microstructure from insufficient plasma power compared to microscaled coatings. The wear mechanisms of both the micro- and nanometric Cr 2 O 3 coatings are fatigue cracks and material transfer.
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significance of in situ Dry Ice Blasting on the microstructure crystallinity and bonding strength of plasma sprayed hydroxyapatite coatings
Journal of The Mechanical Behavior of Biomedical Materials, 2017Co-Authors: Shujuan Dong, Jinyan Zeng, Lifen Li, Xiong Yang, Hanlin LiaoAbstract:Abstract To obtain hydroxyapatite (HA) coatings with high crystallinity which have long-term stability in clinical applications, coarse powders were usually injected to less energetic plasma. However, the HA coatings accumulated by partly melted particles usually have high porosity and poor mechanical properties, especially poor bonding strength. In this work, by profiting its quenching and mechanical impact, Dry-Ice Blasting was in-situ employed during plasma spray process to improve the microstructure characterization and bonding strength of HA coatings. In addition, the influence of in-situ Dry-Ice Blasting on the phase composition and crystallinity of plasma-sprayed HA coatings was investigated. The results show that a significant reduction of porosity and an apparent increase in bonding strength are revealed in plasma-sprayed HA coatings due to the cleaning effect of Dry-Ice Blasting on the convex unmelted particles and splashing fragments. HA coatings prepared by the combination process of plasma spraying and Dry-Ice Blasting have a compromise structure with minimum globular pores but with pronounced microcracks. The disappearance of CaO phase and the increase in crystallinity also derive from the application of Dry-Ice Blasting.
Bo Song - One of the best experts on this subject based on the ideXlab platform.
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Correction to: Effect of Dry-Ice Blasting on Structure and Magnetic Properties of Plasma-Sprayed Fe-40Al Coating from Nanostructured Powders
Journal of Thermal Spray Technology, 2019Co-Authors: Bo Song, BERNARD HANSZ, Shujuan Dong, Hanlin Liao, Christian CoddetAbstract:The authors erroneously omitted.
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Deposition of NiCrBSi coatings by atmospheric plasma spraying and Dry-Ice Blasting: Microstructure and wear resistance
Surface and Coatings Technology, 2015Co-Authors: Shujuan Dong, H B Liao, Bo Song, Christian CoddetAbstract:Atmospheric plasma spraying (APS) offers a wide range of coatings with very different compositions and properties. Special attention has been paid to NiCrBSi alloys, as promising alternatives to hard chromium plating due to their high wear and corrosion resistance at high temperatures. In this study, Dry-Ice Blasting was combined simultaneously with plasma spraying in order to modify the characteristics of metal alloy coatings. A microstructural and tribological comparison between NiCrBSi coatings obtained by conventional APS and those via Dry-Ice Blasting is carried out. The main wear mechanisms are investigated by the characterization of the wear track and debris using scanning electron microscopy (SEM). It can be observed that coatings using Dry-Ice Blasting consisted of NiCrBSi splats with better flattening and higher percentage of amorphous phase. Oxidation is the main wear mechanism for both coatings. Material transfer takes place between the 100Cr6 ball and the NiCrBSi coating. Better tribological behavior was observed for Dry-Ice blasted NiCrBSi coatings at diverse sliding velocities.
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Dielectric properties of Al_2O_3 coatings deposited via atmospheric plasma spraying and Dry-Ice Blasting correlated with microstructural characteristics
Applied Physics A, 2015Co-Authors: Shujuan Dong, Bo Song, Hanlin Liao, Christian CoddetAbstract:In this work, atmospheric plasma spraying combined with Dry-Ice Blasting have been used to prepare alumina (Al_2O_3) coatings designed for insulating applications. The microstructural characteristics and dielectric properties of Al_2O_3 coatings were presented. The electrical insulating properties, i.e., dielectric strength and breakdown voltage, were investigated by dielectric breakdown test using direct current and alternating current. Relationships between dielectric properties and coating characteristics were discussed. The results showed that Dry-Ice Blasting used during atmospheric plasma spray process allowed the production of coatings with better dielectric properties than those prepared without Dry-Ice Blasting. The dielectric properties were correlated with the microstructural characteristics, not with phase composition.
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Effect of Dry-Ice Blasting on the deposition behavior of molybdenum particles onto aluminum and stainless steel substrates using plasma spraying: From single splat to coating
Surface and Coatings Technology, 2015Co-Authors: Shujuan Dong, H B Liao, Bo Song, Christian CoddetAbstract:Molybdenum splats usually exhibit splitting morphology onto aluminum and stainless steel substrates due to substrate melting and their own high surface tension using plasma spraying. In this study, Mo particles were sprayed onto different substrates, which were treated by Dry-Ice Blasting combined with substrate preheating. The splats were studied using detailed microstructural characterization with an emphasis on the splat shape. Moreover, the corresponding Mo coatings deposited onto different substrates were obtained. The results showed that the splitting splat formed on stainless steel was different from that on the aluminum surface. Dry-Ice Blasting combined with substrate preheating slightly modify the morphology of Mo splat sprayed on aluminum and stainless steel surfaces.
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suppression effect of decarburization by Dry Ice Blasting on plasma sprayed steel coatings structure wear performance and magnetic properties
Surface & Coatings Technology, 2014Co-Authors: Bo Song, BERNARD HANSZ, Shujuan Dong, Hanlin Liao, Christian CoddetAbstract:Abstract Steel coatings prepared by atmospheric thermal spraying with Dry-Ice Blasting were studied in terms of phase structure, magnetic and wear behaviors. It was found that Dry-Ice Blasting could suppress the volatilization of carbon during spraying process due to the exclusion effect of carbon dioxide gas sublimated from Dry-Ice pellets on the oxygen. Moreover, the fractographic observation of the deposited coatings proved the removal effect of Dry-Ice Blasting on the splashing particulates which were distributed with poor bonding strength between the splat layers. In addition, it has been found that the magnetic properties are sensitive to the direction in the coating, although steel coating presents a ferromagnetic character in the parallel and vertical directions. Steel coating deposited with Dry-Ice Blasting possesses a relatively lower saturation magnetization but has a superior wear resistance because of the suppression of decarburization during the spraying process.
BERNARD HANSZ - One of the best experts on this subject based on the ideXlab platform.
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Correction to: Effect of Dry-Ice Blasting on Structure and Magnetic Properties of Plasma-Sprayed Fe-40Al Coating from Nanostructured Powders
Journal of Thermal Spray Technology, 2019Co-Authors: Bo Song, BERNARD HANSZ, Shujuan Dong, Hanlin Liao, Christian CoddetAbstract:The authors erroneously omitted.
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suppression effect of decarburization by Dry Ice Blasting on plasma sprayed steel coatings structure wear performance and magnetic properties
Surface & Coatings Technology, 2014Co-Authors: Bo Song, BERNARD HANSZ, Shujuan Dong, Hanlin Liao, Christian CoddetAbstract:Abstract Steel coatings prepared by atmospheric thermal spraying with Dry-Ice Blasting were studied in terms of phase structure, magnetic and wear behaviors. It was found that Dry-Ice Blasting could suppress the volatilization of carbon during spraying process due to the exclusion effect of carbon dioxide gas sublimated from Dry-Ice pellets on the oxygen. Moreover, the fractographic observation of the deposited coatings proved the removal effect of Dry-Ice Blasting on the splashing particulates which were distributed with poor bonding strength between the splat layers. In addition, it has been found that the magnetic properties are sensitive to the direction in the coating, although steel coating presents a ferromagnetic character in the parallel and vertical directions. Steel coating deposited with Dry-Ice Blasting possesses a relatively lower saturation magnetization but has a superior wear resistance because of the suppression of decarburization during the spraying process.
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fabrication of fesib magnetic coatings with improved saturation magnetization by plasma spray and Dry Ice Blasting
Journal of Alloys and Compounds, 2014Co-Authors: Shujuan Dong, Chunming Deng, BERNARD HANSZ, Nouredine Fenineche, Bo Song, Xiaofeng Zhang, Hanlin Liao, Christian CoddetAbstract:Abstract Dry-Ice Blasting is applied in atmospheric plasma spraying process with an aim to deposit FeSiB magnetic coatings with improved saturation magnetization. Surface morphology, cross-sectional microstructure, phase composition, magnetic and mechanical properties of plasma-sprayed FeSiB coatings without and with the treatment of Dry-Ice Blasting were compared with those deposited with compressed air cooling. The results indicate that Dry-Ice Blasting has a significant effect on the surface morphology and cross-sectional microstructure of FeSiB coating. After the treatment of Dry-Ice Blasting, the splashes and oxides of FeSiB coating drastically decreases and the Fe0.9Si0.1 phase of the coating decreases while the Fe2B increases due to the efficient cooling effect. In addition, a notIceable improvement in the saturation magnetization and in mechanical properties has been obtained, corresponding to the structural and composition changes.
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Fabrication of FeSiB magnetic coatings with improved saturation magnetization by plasma spray and Dry-Ice Blasting
Journal of Alloys and Compounds, 2014Co-Authors: Shujuan Dong, Chunming Deng, BERNARD HANSZ, H B Liao, Nouredine Fenineche, Bo Song, Xiaofeng Zhang, Christian CoddetAbstract:Dry-Ice Blasting is applied in atmospheric plasma spraying process with an aim to deposit FeSiB magnetic coatings with improved saturation magnetization. Surface morphology, cross-sectional microstructure, phase composition, magnetic and mechanical properties of plasma-sprayed FeSiB coatings without and with the treatment of Dry-Ice Blasting were compared with those deposited with compressed air cooling. The results indicate that Dry-Ice Blasting has a significant effect on the surface morphology and cross-sectional microstructure of FeSiB coating. After the treatment of Dry-Ice Blasting, the splashes and oxides of FeSiB coating drastically decreases and the Fe0.9Si0.1 phase of the coating decreases while the Fe2B increases due to the efficient cooling effect. In addition, a notIceable improvement in the saturation magnetization and in mechanical properties has been obtained, corresponding to the structural and composition changes. ?? 2013 Elsevier B.V. All rights reserved.
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Suppression effect of decarburization by Dry-Ice Blasting on plasma-sprayed steel coatings: Structure, wear performance and magnetic properties
Surface and Coatings Technology, 2014Co-Authors: Bo Song, BERNARD HANSZ, H B Liao, Shujuan Dong, Christian CoddetAbstract:Steel coatings prepared by atmospheric thermal spraying with Dry-Ice Blasting were studied in terms of phase structure, magnetic and wear behaviors. It was found that Dry-Ice Blasting could suppress the volatilization of carbon during spraying process due to the exclusion effect of carbon dioxide gas sublimated from Dry-Ice pellets on the oxygen. Moreover, the fractographic observation of the deposited coatings proved the removal effect of Dry-Ice Blasting on the splashing particulates which were distributed with poor bonding strength between the splat layers. In addition, it has been found that the magnetic properties are sensitive to the direction in the coating, although steel coating presents a ferromagnetic character in the parallel and vertical directions. Steel coating deposited with Dry-Ice Blasting possesses a relatively lower saturation magnetization but has a superior wear resistance because of the suppression of decarburization during the spraying process. © 2014 Elsevier B.V.
Hanlin Liao - One of the best experts on this subject based on the ideXlab platform.
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Correction to: Effect of Dry-Ice Blasting on Structure and Magnetic Properties of Plasma-Sprayed Fe-40Al Coating from Nanostructured Powders
Journal of Thermal Spray Technology, 2019Co-Authors: Bo Song, BERNARD HANSZ, Shujuan Dong, Hanlin Liao, Christian CoddetAbstract:The authors erroneously omitted.
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substrate pre treatment by Dry Ice Blasting and cold spraying of titanium
Surface Engineering, 2018Co-Authors: S Dong, Hanlin LiaoAbstract:ABSTRACTWith the aim of avoiding the composition modification of titanium particles and substrate degradation during conventional thermal spray process, a combination process of cold spraying and Dry-Ice Blasting was used in the present study to deposit titanium coatings on different metallic substrates. Moreover, a tentative study on cold spraying of titanium coatings on non-metallic surfaces such as polymers was carried out by profiting the texturing potential of Dry-Ice Blasting. The deposition characteristics of titanium particles were examined in terms of deposition efficiency, coating microstructure, microhardness and bonding strength. Only several titanium particles were embedded into polymer with no build-up of a layer or coating in spite of Dry-Ice Blasting application. Titanium coatings coated on metallic substrates exhibited a porous structure and no obvious difference in outer and inner microstructure was distinguished. In addition, Dry-Ice Blasting has a positive improvement in bonding streng...
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significance of in situ Dry Ice Blasting on the microstructure crystallinity and bonding strength of plasma sprayed hydroxyapatite coatings
Journal of The Mechanical Behavior of Biomedical Materials, 2017Co-Authors: Shujuan Dong, Jinyan Zeng, Lifen Li, Xiong Yang, Hanlin LiaoAbstract:Abstract To obtain hydroxyapatite (HA) coatings with high crystallinity which have long-term stability in clinical applications, coarse powders were usually injected to less energetic plasma. However, the HA coatings accumulated by partly melted particles usually have high porosity and poor mechanical properties, especially poor bonding strength. In this work, by profiting its quenching and mechanical impact, Dry-Ice Blasting was in-situ employed during plasma spray process to improve the microstructure characterization and bonding strength of HA coatings. In addition, the influence of in-situ Dry-Ice Blasting on the phase composition and crystallinity of plasma-sprayed HA coatings was investigated. The results show that a significant reduction of porosity and an apparent increase in bonding strength are revealed in plasma-sprayed HA coatings due to the cleaning effect of Dry-Ice Blasting on the convex unmelted particles and splashing fragments. HA coatings prepared by the combination process of plasma spraying and Dry-Ice Blasting have a compromise structure with minimum globular pores but with pronounced microcracks. The disappearance of CaO phase and the increase in crystallinity also derive from the application of Dry-Ice Blasting.
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deposition and characterization of wc co hard metal coatings by high velocity oxy fuel process combined with Dry Ice Blasting
International Journal of Refractory Metals & Hard Materials, 2017Co-Authors: Shujuan Dong, Jinyan Zeng, Hanlin LiaoAbstract:Abstract The residual stresses arising during high velocity oxy-fuel (HVOF) process usually restrict the building up of thick coatings. The potential of in-situ Dry-Ice Blasting treatment during HVOF process to deposit thick WC-Co coatings with high quality due to its efficient cooling and mechanical peening was investigated in the present work. Characterization of WC–Co coatings deposited by HVOF combined with Dry-Ice Blasting was carried out and compared with that of the coatings prepared using conventional HVOF. Several techniques, including scanning electron microscopy, X-ray diffraction and energy dispersive spectroscopy, were used to characterize the microstructures and phase distribution of the powders and coatings. In addition, mechanical properties such as hardness and sliding wear resistance were evaluated. The results demonstrate that HVOF-sprayed WC-Co coating with Dry-Ice Blasting is characterized by compact construction, grain refinement as well as high hardness. Different from the prevention phenomenon of decarburization observed for plasma spraying of austenitic steel, WC decarburization still occurs for HVOF-sprayed WC-Co coating with Dry-Ice Blasting. The in-situ Dry-Ice Blasting treatment results in minute improvement in wear resistance of WC-Co coatings.
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Dielectric properties of Al_2O_3 coatings deposited via atmospheric plasma spraying and Dry-Ice Blasting correlated with microstructural characteristics
Applied Physics A, 2015Co-Authors: Shujuan Dong, Bo Song, Hanlin Liao, Christian CoddetAbstract:In this work, atmospheric plasma spraying combined with Dry-Ice Blasting have been used to prepare alumina (Al_2O_3) coatings designed for insulating applications. The microstructural characteristics and dielectric properties of Al_2O_3 coatings were presented. The electrical insulating properties, i.e., dielectric strength and breakdown voltage, were investigated by dielectric breakdown test using direct current and alternating current. Relationships between dielectric properties and coating characteristics were discussed. The results showed that Dry-Ice Blasting used during atmospheric plasma spray process allowed the production of coatings with better dielectric properties than those prepared without Dry-Ice Blasting. The dielectric properties were correlated with the microstructural characteristics, not with phase composition.
