The Experts below are selected from a list of 33303 Experts worldwide ranked by ideXlab platform
Zhiping Wang - One of the best experts on this subject based on the ideXlab platform.
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thermal cycling behavior of thermal barrier coatings with mcraly bond coat Irradiated by high current pulsed electron beam
ACS Applied Materials & Interfaces, 2016Co-Authors: Peng Lv, Qingfeng Guan, Xiaojing Xu, Jinzhong Lu, Zhiping WangAbstract:Microstructural modifications of a thermally sprayed MCrAlY bond coat subjected to high-current pulsed electron beam (HCPEB) and their relationships with thermal cycling behavior of thermal barrier coatings (TBCs) were investigated. Microstructural observations revealed that the rough Surface of air plasma spraying (APS) samples was significantly remelted and replaced by many interconnected bulged nodules after HCPEB irradiation. Meanwhile, the parallel columnar grains with growth direction perpendicular to the coating Surface were observed inside these bulged nodules. Substantial Y-rich Al2O3 bubbles and varieties of nanocrystallines were distributed evenly on the top of the modified layer. A physical model was proposed to describe the evaporation–condensation mechanism taking place at the Irradiated Surface for generating such Surface morphologies. The results of thermal cycling test showed that HCPEB-TBCs presented higher thermal cycling resistance, the spalling area of which after 200 cycles accounted...
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isothermal oxidation behaviour of thermal barrier coatings with cocraly bond coat Irradiated by high current pulsed electron beam
Applied Surface Science, 2014Co-Authors: Qingfeng Guan, Zhiping Wang, Jingxin SuAbstract:Abstract Thermal sprayed CoCrAlY bond coat Irradiated by high-current pulsed electron beam (HCPEB) and thermal barrier coatings (TBCs) prepared with the Irradiated bond coat and the ceramic top coat were investigated. The high temperature oxidation resistance of these specimens was tested at 1050 °C in air. Microstructure observations revealed that the original coarse Surface of the as-sprayed bond coat was significantly changed as the interconnected bulged nodules with a compact appearance after HCPEB irradiation. Abundant Y-rich alumina particulates and very fine grains were dispersed on the Irradiated Surface. After high temperature oxidation test, the thermally grown oxide (TGO) in the initial TBCs grew rapidly and was comprised of two distinct layers: a large percentage of mixed oxides in the outer layer and a relatively small portion of Al2O3 in the inner layer. Severe local internal oxidation and extensive cracks in the TGO layer were discovered as well. Comparatively, the Irradiated TBCs exhibited thinner TGO layer, slower TGO growth rate, and homogeneous TGO composition (primarily consisting of Al2O3). The results indicate that TBCs with the Irradiated bond coat have a much higher oxidation resistance.
Qingfeng Guan - One of the best experts on this subject based on the ideXlab platform.
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thermal cycling behavior of thermal barrier coatings with mcraly bond coat Irradiated by high current pulsed electron beam
ACS Applied Materials & Interfaces, 2016Co-Authors: Peng Lv, Qingfeng Guan, Xiaojing Xu, Jinzhong Lu, Zhiping WangAbstract:Microstructural modifications of a thermally sprayed MCrAlY bond coat subjected to high-current pulsed electron beam (HCPEB) and their relationships with thermal cycling behavior of thermal barrier coatings (TBCs) were investigated. Microstructural observations revealed that the rough Surface of air plasma spraying (APS) samples was significantly remelted and replaced by many interconnected bulged nodules after HCPEB irradiation. Meanwhile, the parallel columnar grains with growth direction perpendicular to the coating Surface were observed inside these bulged nodules. Substantial Y-rich Al2O3 bubbles and varieties of nanocrystallines were distributed evenly on the top of the modified layer. A physical model was proposed to describe the evaporation–condensation mechanism taking place at the Irradiated Surface for generating such Surface morphologies. The results of thermal cycling test showed that HCPEB-TBCs presented higher thermal cycling resistance, the spalling area of which after 200 cycles accounted...
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isothermal oxidation behaviour of thermal barrier coatings with cocraly bond coat Irradiated by high current pulsed electron beam
Applied Surface Science, 2014Co-Authors: Qingfeng Guan, Zhiping Wang, Jingxin SuAbstract:Abstract Thermal sprayed CoCrAlY bond coat Irradiated by high-current pulsed electron beam (HCPEB) and thermal barrier coatings (TBCs) prepared with the Irradiated bond coat and the ceramic top coat were investigated. The high temperature oxidation resistance of these specimens was tested at 1050 °C in air. Microstructure observations revealed that the original coarse Surface of the as-sprayed bond coat was significantly changed as the interconnected bulged nodules with a compact appearance after HCPEB irradiation. Abundant Y-rich alumina particulates and very fine grains were dispersed on the Irradiated Surface. After high temperature oxidation test, the thermally grown oxide (TGO) in the initial TBCs grew rapidly and was comprised of two distinct layers: a large percentage of mixed oxides in the outer layer and a relatively small portion of Al2O3 in the inner layer. Severe local internal oxidation and extensive cracks in the TGO layer were discovered as well. Comparatively, the Irradiated TBCs exhibited thinner TGO layer, slower TGO growth rate, and homogeneous TGO composition (primarily consisting of Al2O3). The results indicate that TBCs with the Irradiated bond coat have a much higher oxidation resistance.
Jingxin Su - One of the best experts on this subject based on the ideXlab platform.
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isothermal oxidation behaviour of thermal barrier coatings with cocraly bond coat Irradiated by high current pulsed electron beam
Applied Surface Science, 2014Co-Authors: Qingfeng Guan, Zhiping Wang, Jingxin SuAbstract:Abstract Thermal sprayed CoCrAlY bond coat Irradiated by high-current pulsed electron beam (HCPEB) and thermal barrier coatings (TBCs) prepared with the Irradiated bond coat and the ceramic top coat were investigated. The high temperature oxidation resistance of these specimens was tested at 1050 °C in air. Microstructure observations revealed that the original coarse Surface of the as-sprayed bond coat was significantly changed as the interconnected bulged nodules with a compact appearance after HCPEB irradiation. Abundant Y-rich alumina particulates and very fine grains were dispersed on the Irradiated Surface. After high temperature oxidation test, the thermally grown oxide (TGO) in the initial TBCs grew rapidly and was comprised of two distinct layers: a large percentage of mixed oxides in the outer layer and a relatively small portion of Al2O3 in the inner layer. Severe local internal oxidation and extensive cracks in the TGO layer were discovered as well. Comparatively, the Irradiated TBCs exhibited thinner TGO layer, slower TGO growth rate, and homogeneous TGO composition (primarily consisting of Al2O3). The results indicate that TBCs with the Irradiated bond coat have a much higher oxidation resistance.
Jin Zhang - One of the best experts on this subject based on the ideXlab platform.
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Surface modification of 316l stainless steel with high intensity pulsed ion beams
Surface & Coatings Technology, 2007Co-Authors: Xingyuan Wang, Jin ZhangAbstract:Abstract The Surface of 316L stainless steel was Irradiated by high-intensity pulsed ion beams (HIPIB) at ion current density of 100, 200 and 300 A/cm 2 with 10 shots. The Surface morphology and the phase structure in the near Surface region of original and treated samples were analyzed with scanning electron microscope (SEM) and X-ray diffraction (XRD). Electron probe microanalysis (EPMA) was used to study the distribution of elements on the Irradiated Surfaces. It is found that the HIPIB irradiation can smooth the Surface of the targets, and a preferred orientation presents in the Surface layer of the treated samples. Otherwise, selective ablation of impurities occurs during the interaction between HIPIB and the targets. Due to the compress stress wave induced by the bombardment, the microhardness is increased significantly in a depth range of up to 200 μm, which reduces the friction coefficient of the treated Surfaces and improves the wear resistance of them. Because the grain size reduces and the impurities content decreases in the Irradiated Surface layer, the electrochemical corrosion resistance is enhanced. In addition, HIPIB irradiation prolongates the fatigue life of 316L at room temperature due to a combination of the smooth Surface and the high dislocation density in the Surface layer of the treated samples.
J S Zhang - One of the best experts on this subject based on the ideXlab platform.
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Surface modification of 316l stainless steel with high intensity pulsed ion beams
Surface & Coatings Technology, 2007Co-Authors: Xianbing Wang, M K Lei, J S ZhangAbstract:Abstract The Surface of 316L stainless steel was Irradiated by high-intensity pulsed ion beams (HIPIB) at ion current density of 100, 200 and 300 A/cm 2 with 10 shots. The Surface morphology and the phase structure in the near Surface region of original and treated samples were analyzed with scanning electron microscope (SEM) and X-ray diffraction (XRD). Electron probe microanalysis (EPMA) was used to study the distribution of elements on the Irradiated Surfaces. It is found that the HIPIB irradiation can smooth the Surface of the targets, and a preferred orientation presents in the Surface layer of the treated samples. Otherwise, selective ablation of impurities occurs during the interaction between HIPIB and the targets. Due to the compress stress wave induced by the bombardment, the microhardness is increased significantly in a depth range of up to 200 μm, which reduces the friction coefficient of the treated Surfaces and improves the wear resistance of them. Because the grain size reduces and the impurities content decreases in the Irradiated Surface layer, the electrochemical corrosion resistance is enhanced. In addition, HIPIB irradiation prolongates the fatigue life of 316L at room temperature due to a combination of the smooth Surface and the high dislocation density in the Surface layer of the treated samples.
