The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
Xinhong Wang - One of the best experts on this subject based on the ideXlab platform.
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FORMATION MECHANISM OF TITANIUM CARBIDE CRYSTAL IN LASER SYNTHESIZED METAL-CERAMIC COMPOSITE COATING
Surface Review and Letters, 2011Co-Authors: Zhongwen Zhang, Xinhong Wang, Zengda ZouAbstract:In situ titanium carbide reinforced iron-based composite coating was deposited on mild carbon steel using laser surface engineering (LSE) with Ferrotitanium and graphite as precursor. The microstructure and phase constituents of the deposited coating were characterized. Formation mechanism of titanium carbide crystal in the composite coating was elucidated by correlating the morphology of titanium carbide and the thermal cycle experienced by the precursor during the laser treatment. It was demonstrated that titanium carbide was formed in situ as a result of the metallurgical reaction between Ferrotitanium and graphite following a liquid-precipitation route. Different morphologies of titanium carbide crystal (dendrite and fishbone) correspond to the primary and eutectic titanium carbide respectively.
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Microstructure and wear properties of Fe–TiC surface composite coating by laser cladding
Journal of Materials Science, 2008Co-Authors: Xinhong Wang, Min Zhang, Zengda ZouAbstract:AISI 1045 steel surface was alloyed with pre-placed Ferrotitanium and graphite powders by using a 5-kW CO2 laser. In situ TiC particles reinforced Fe-based surface composite coating was fabricated. The microstructure and wear properties were investigated by means of scanning electron microscopy, transmission electron microscopy, and X-ray diffraction, as well as dry sliding wear test. The results showed that TiC carbides with cubic or flower-like dendritic form were synthesized via in situ reaction between Ferrotitanium and graphite in the molten pool during laser cladding process. The TiC carbides were distributed uniformly in the composite coating. The TiC/matrix interface was found to be free from cracks and deleterious phase. The coatings reinforced by TiC particles revealed higher wear resistance than that of the substrate.
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IN SITU SYNTHESIS OF TiC–TiB2 REINFORCED FeCrSiB COMPOSITE COATING BY LASER CLADDING
Surface Review and Letters, 2007Co-Authors: Zengda Zou, Xinhong WangAbstract:TiC and TiB 2 reinforced iron based metal matrix composite (MMC) coating was synthesized on mild carbon steel by laser cladding employing B 4 C , Ferrotitanium, and FeCrSiB mixed powders. The microstructure and chemical composition were analyzed by means of SEM, EPMA, and XRD. Results show that the coating mainly consists of α– Fe(Ni) , TiB 2, TiC , B 6 Fe 23, Cr 2 B , and M 23 C 6. TiB 2, and TiC reinforcements are formed in situ through the reaction between B 4 C and Ferrotitanium. Hardness and wear measurement results show that the hardness and wear resistance of the composites are much higher than that of the as-received sample.
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Microstructure and properties of the TiC/Fe-based alloy hardfacing layers
Journal of Materials Science, 2005Co-Authors: Xinhong Wang, Shiyao Qu, S.l. SongAbstract:TiC/Fe-based alloy hardfacing layers were obtained by shielded metal arc welding (SMAW), in which H08A bare electrode was coated with a powder mixture of Ferrotitanium, rutile, graphite, calcium carbonate and calcium fluoride. TiC particles are produced by direct metallurgical reaction between Ferrotitanium and graphite during welding. The particles of TiC with cubic shape are distributed evenly in the Fe-rich matrix in the hardfacing layers, the particle size is about 3–5 μ m. The microstructure and mechanical properties of the hardfacing layers are markedly affected by the amounted of the Ferrotitanium and graphite in the coating of the electrode. The wear properties of the hardfacing layers are superior to the substrate AISI 1045 steel. The coefficient of friction data of the hardfacing layers do not show significant fluctuations.
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IN SITU SYNTHESIS OF TiC–TiB2 REINFORCED FeCrSiB COMPOSITE COATING BY LASER CLADDING
1Co-Authors: Zengda Zou, Xinhong WangAbstract:TiC and TiB2 reinforced iron based metal matrix composite (MMC) coating was synthesized on mild carbon steel by laser cladding employing B4C, Ferrotitanium, and FeCrSiB mixed powders. The microstructure and chemical composition were analyzed by means of SEM, EPMA, and XRD. Results show that the coating mainly consists of α–Fe(Ni), TiB2, TiC, B6Fe23, Cr2B, and M23C6. TiB2, and TiC reinforcements are formed in situ through the reaction between B4C and Ferrotitanium. Hardness and wear measurement results show that the hardness and wear resistance of the composites are much higher than that of the as-received sample.Composite materials, coating, in situ synthesized, laser cladding, TiC–TiB2
Zengda Zou - One of the best experts on this subject based on the ideXlab platform.
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FORMATION MECHANISM OF TITANIUM CARBIDE CRYSTAL IN LASER SYNTHESIZED METAL-CERAMIC COMPOSITE COATING
Surface Review and Letters, 2011Co-Authors: Zhongwen Zhang, Xinhong Wang, Zengda ZouAbstract:In situ titanium carbide reinforced iron-based composite coating was deposited on mild carbon steel using laser surface engineering (LSE) with Ferrotitanium and graphite as precursor. The microstructure and phase constituents of the deposited coating were characterized. Formation mechanism of titanium carbide crystal in the composite coating was elucidated by correlating the morphology of titanium carbide and the thermal cycle experienced by the precursor during the laser treatment. It was demonstrated that titanium carbide was formed in situ as a result of the metallurgical reaction between Ferrotitanium and graphite following a liquid-precipitation route. Different morphologies of titanium carbide crystal (dendrite and fishbone) correspond to the primary and eutectic titanium carbide respectively.
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Microstructure and wear properties of Fe–TiC surface composite coating by laser cladding
Journal of Materials Science, 2008Co-Authors: Xinhong Wang, Min Zhang, Zengda ZouAbstract:AISI 1045 steel surface was alloyed with pre-placed Ferrotitanium and graphite powders by using a 5-kW CO2 laser. In situ TiC particles reinforced Fe-based surface composite coating was fabricated. The microstructure and wear properties were investigated by means of scanning electron microscopy, transmission electron microscopy, and X-ray diffraction, as well as dry sliding wear test. The results showed that TiC carbides with cubic or flower-like dendritic form were synthesized via in situ reaction between Ferrotitanium and graphite in the molten pool during laser cladding process. The TiC carbides were distributed uniformly in the composite coating. The TiC/matrix interface was found to be free from cracks and deleterious phase. The coatings reinforced by TiC particles revealed higher wear resistance than that of the substrate.
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IN SITU SYNTHESIS OF TiC–TiB2 REINFORCED FeCrSiB COMPOSITE COATING BY LASER CLADDING
Surface Review and Letters, 2007Co-Authors: Zengda Zou, Xinhong WangAbstract:TiC and TiB 2 reinforced iron based metal matrix composite (MMC) coating was synthesized on mild carbon steel by laser cladding employing B 4 C , Ferrotitanium, and FeCrSiB mixed powders. The microstructure and chemical composition were analyzed by means of SEM, EPMA, and XRD. Results show that the coating mainly consists of α– Fe(Ni) , TiB 2, TiC , B 6 Fe 23, Cr 2 B , and M 23 C 6. TiB 2, and TiC reinforcements are formed in situ through the reaction between B 4 C and Ferrotitanium. Hardness and wear measurement results show that the hardness and wear resistance of the composites are much higher than that of the as-received sample.
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IN SITU SYNTHESIS OF TiC–TiB2 REINFORCED FeCrSiB COMPOSITE COATING BY LASER CLADDING
1Co-Authors: Zengda Zou, Xinhong WangAbstract:TiC and TiB2 reinforced iron based metal matrix composite (MMC) coating was synthesized on mild carbon steel by laser cladding employing B4C, Ferrotitanium, and FeCrSiB mixed powders. The microstructure and chemical composition were analyzed by means of SEM, EPMA, and XRD. Results show that the coating mainly consists of α–Fe(Ni), TiB2, TiC, B6Fe23, Cr2B, and M23C6. TiB2, and TiC reinforcements are formed in situ through the reaction between B4C and Ferrotitanium. Hardness and wear measurement results show that the hardness and wear resistance of the composites are much higher than that of the as-received sample.Composite materials, coating, in situ synthesized, laser cladding, TiC–TiB2
Jihua Huang - One of the best experts on this subject based on the ideXlab platform.
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Fabrication of TiC/Fe–Ni cermet coatings by reactive thermal spraying of Fe–Ti–Ni–C composite powder
Powder Metallurgy, 2011Co-Authors: Haitao Wang, Shuaifeng Zhang, Jihua Huang, J. Zhu, Hua Zhang, Xingke ZhaoAbstract:A mixture of Ferrotitanium, nickel powders and sucrose was heated with an intention of carbonising the sucrose. The tiny Ferrotitanium, nickel particles are bound by the carbon obtained from pyrolysis of the sucrose to form a unique structure of Fe–Ti–Ni–C composite powder for reactive thermal spraying. The carbon is a reactive constituent as well as the binder in the composite powder. TiC/Fe–Ni cermet coating was prepared by reactive plasma spraying of this powder. A mass of TiC particles were in situ synthesised and uniformly distributed in the Fe–Ni alloy matrix without residuals of raw materials in the coating. The coating is consisted of two different areas: one is the composite area, where lots of spherical fine TiC particles (100–500 nm) are homogeneously distributed within the Fe–Ni alloy matrix; the other is a small fraction of TiC accumulation. The volume fraction of composite area is >87%.
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Fabrication of TiC–Fe cermet coating by plasma spraying of Fe–Ti–C powder using sucrose as carbon source
Materials Science and Technology, 2010Co-Authors: Haitao Wang, Shuaifeng Zhang, Jihua Huang, J. Zhu, Hua Zhang, Xingke ZhaoAbstract:Abstract A mixture of Ferrotitanium and sucrose was heated to carbonise the sucrose, so the Ferrotitanium particles were bound by the carbon obtained from the pyrolysis of sucrose. Then a Fe–Ti–C composite powder was made for reactive thermal spraying, which could avoid separation of Ti and C during spraying. The carbon is a reactive constituent as well as the binder in the composite powder. While this powder was used to deposit cermet coating by plasma spraying, a mass of TiC particles were in situ synthesised and uniformly distributed within metallic matrix. Average microhardness and surface hardness of the TiC–Fe coating are about 1672·5 HV0·2 and 91·4 HR(15 N) respectively. Adhesive strength value of the coating reaches 61·86 MPa. Finally, the cermet coating has good wear resistance performance.
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Microstructure of cermet coating prepared by plasma spraying of Fe–Ti–C powder using sucrose as carbonaceous precursor
Journal of Alloys and Compounds, 2008Co-Authors: Haitao Wang, Jihua Huang, J. Zhu, Hua Zhang, Xinke ZhaoAbstract:Abstract In this paper, a kind of Fe–Ti–C composite powder for reactive plasma spraying (RPS) was prepared by heating a mixture of Ferrotitanium and sucrose as a carbonaceous precursor, with an intention of carbonizing the sucrose. The tiny Ferrotitanium particles were bound by the carbon obtained from the carbonization of sucrose. The carbon was a reactive element as well as a binder in the composite powder. While the composite powder was sprayed to deposit TiC/Fe composite coating by RPS, it was proved that the reaction between Ti and C was performed completely to form TiC, without impurity or residual raw materials in the coating. The composite coating is mainly composed of layers in which a mass of TiC particles are uniformly distributed and enwrapped within the crystal grains of metallic matrix, and the TiC particles in these layers are spherical or near-spherical in submicron-scale or nano-scale sizes.
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Reactive flame spraying of TiC–Fe cermet coating using asphalt as a carbonaceous precursor
Surface & Coatings Technology, 2005Co-Authors: Huiyuan Liu, Jihua HuangAbstract:Abstract In this paper, a kind of Ti–Fe–C compound powder for reactive flame spray (RFS), using Ferrotitanium and asphalt as raw materials, was prepared. The main feature of the process was that asphalt, as a carbonaceous precursor, is used as the origin of carbon. The agglomerated Ti–Fe–C compound spraying powder was prepared by heating a mixture of Ferrotitanium and asphalt to pyrolyze the asphalt. The carbon by the pyrolysis of the asphalt was a reactive constituent as well as a binder in the compound powders. TiC/Fe cermet coating was prepared by RFS of the compound powder. XRD and SEM were employed to analyze the phase composition and microstructure of the compound powder and coating. The hardness and wear resistance of the coatings were tested. The results show that: The Ti–Fe–C compound powder has a very tight structure, which can avoid the problem that reactive constituent particles are separated during spraying. The TiC–Fe cermet coating by RFS presents typical morphology of thermal spraying coating with two different laminated layers: one is the composite reinforcement layer in which the round fine TiC particles are dispersed within the α-Fe matrix, the other is the layer of TiC accumulation. The TiC/Fe cermet coating by RFS shows high hardness and wear resistance property: the surface hardness of the TiC/Fe cermet coating is 65 + 6(HR30N). In the same fretting conditions, the wear area of Ni60 coating is much more than that of the TiC/Fe cermet coating.
X. H. Wang - One of the best experts on this subject based on the ideXlab platform.
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In situ synthesised TiC particles reinforced Fe based composite coating produced by laser cladding
Materials Science and Technology, 2009Co-Authors: X. H. Wang, Z.d. ZouAbstract:Abstract Fe based composite coating reinforced by in situ synthesised TiC particles has been fabricated from a precursor mixture of Ferrotitanium (Fe–Ti) alloy and graphite powders by laser cladding. The microstructure and wear properties were analysed by means of scanning electron microscopy, transmission electron microscopy and X-ray diffraction, as well as dry sliding wear test. The results showed that TiC carbides were formed via in situ reaction between Ferrotitanium (Fe–Ti) and graphite in the molten pool during laser cladding process. The morphologies of TiC were of dendritic, cubic or flower-like shape; and the TiC carbides were distributed uniformly in the composite coating. Compared to the substrate, the hardness and the wear resistance of the coatings reinforced by TiC particles were significantly enhanced, but the coating possesses a lower friction coefficient.
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In situ production of Fe–TiC surface composite coatings by tungsten-inert gas heat source
Surface and Coatings Technology, 2006Co-Authors: X. H. Wang, S.l. Song, Min Zhang, Z.d. Zou, Fang HanAbstract:Abstract In the present study, AISI 1045 steel surfaces were alloyed with pre-placed graphite, Ferrotitanium and Fe–Cr–B–Si powders by using a tungsten-inert gas (TIG) heat source. The effects of welding parameters and thickness of the pre-placed powder layers on the microstructure and properties of the coatings were also investigated. The results indicated that TiC particles can be obtained by direct metallurgical reaction between Ferrotitanium and graphite during the TIG welding process. Most of TiC particles were uniformly distributed in the surface coating. The microhardness showed a gradient variation from the molten boundary to the top surface of the coatings, and it was influenced by the thickness of the pre-placed powder layer and the welding parameters. The surface composite coating exhibited a higher hardness and lower wear rate than that of the substrate due to the formation of TiC carbides.
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microstructure and wear properties of fe based hardfacing coating reinforced by tic particles
Journal of Materials Processing Technology, 2005Co-Authors: X. H. Wang, Shiyao Qu, S.l. SongAbstract:Abstract In the present study, Fe-based hardfacing coating reinforced by TiC particles was obtained by manual shielded metal arc welding (SMAW) in which H08A bare electrode was coated with fluxes, to which different measures of Ferrotitanium, rutile, graphite, calcium carbonate and calcium fluoride had been added. The microstructure and wear properties of the hardfacing coating were studied by means of scanning electron microscopy (SEM), transmission electron microscopy (TEM), an X-ray diffractometer (XRD) and a wear test. The results indicate that TiC particles are produced by direct metallurgical reaction between Ferrotitanium and graphite during welding. TiC particles are uniformly dispersed in the matrix of lath martensite and retained austenite with particle sizes in the range 3–5 μm. Fe-based hardfacing coating reinforced by TiC particles is found to possess better wear resistance and lower coefficient of friction than that of AISI 1045 steel substrate.
S.l. Song - One of the best experts on this subject based on the ideXlab platform.
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In situ production of Fe–TiC surface composite coatings by tungsten-inert gas heat source
Surface and Coatings Technology, 2006Co-Authors: X. H. Wang, S.l. Song, Min Zhang, Z.d. Zou, Fang HanAbstract:Abstract In the present study, AISI 1045 steel surfaces were alloyed with pre-placed graphite, Ferrotitanium and Fe–Cr–B–Si powders by using a tungsten-inert gas (TIG) heat source. The effects of welding parameters and thickness of the pre-placed powder layers on the microstructure and properties of the coatings were also investigated. The results indicated that TiC particles can be obtained by direct metallurgical reaction between Ferrotitanium and graphite during the TIG welding process. Most of TiC particles were uniformly distributed in the surface coating. The microhardness showed a gradient variation from the molten boundary to the top surface of the coatings, and it was influenced by the thickness of the pre-placed powder layer and the welding parameters. The surface composite coating exhibited a higher hardness and lower wear rate than that of the substrate due to the formation of TiC carbides.
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microstructure and wear properties of fe based hardfacing coating reinforced by tic particles
Journal of Materials Processing Technology, 2005Co-Authors: X. H. Wang, Shiyao Qu, S.l. SongAbstract:Abstract In the present study, Fe-based hardfacing coating reinforced by TiC particles was obtained by manual shielded metal arc welding (SMAW) in which H08A bare electrode was coated with fluxes, to which different measures of Ferrotitanium, rutile, graphite, calcium carbonate and calcium fluoride had been added. The microstructure and wear properties of the hardfacing coating were studied by means of scanning electron microscopy (SEM), transmission electron microscopy (TEM), an X-ray diffractometer (XRD) and a wear test. The results indicate that TiC particles are produced by direct metallurgical reaction between Ferrotitanium and graphite during welding. TiC particles are uniformly dispersed in the matrix of lath martensite and retained austenite with particle sizes in the range 3–5 μm. Fe-based hardfacing coating reinforced by TiC particles is found to possess better wear resistance and lower coefficient of friction than that of AISI 1045 steel substrate.
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Microstructure and properties of the TiC/Fe-based alloy hardfacing layers
Journal of Materials Science, 2005Co-Authors: Xinhong Wang, Shiyao Qu, S.l. SongAbstract:TiC/Fe-based alloy hardfacing layers were obtained by shielded metal arc welding (SMAW), in which H08A bare electrode was coated with a powder mixture of Ferrotitanium, rutile, graphite, calcium carbonate and calcium fluoride. TiC particles are produced by direct metallurgical reaction between Ferrotitanium and graphite during welding. The particles of TiC with cubic shape are distributed evenly in the Fe-rich matrix in the hardfacing layers, the particle size is about 3–5 μ m. The microstructure and mechanical properties of the hardfacing layers are markedly affected by the amounted of the Ferrotitanium and graphite in the coating of the electrode. The wear properties of the hardfacing layers are superior to the substrate AISI 1045 steel. The coefficient of friction data of the hardfacing layers do not show significant fluctuations.