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学者姓名:杨冠军

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Molecular dynamics simulation and experimental verification for bonding formation of solid-state TiO2 nano-particles induced by high velocity collision EI SCIE
期刊论文 | 2019 , 45 (4) , 4700-4706 | Ceramics International
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Abstract :

Collision processes of solid-state nano-sized ceramic particles were investigated by molecular dynamics (MD) simulation in order to clarify their bonding mechanisms. Effect of particle temperature on particle bonding formation was examined, and collision behavior of nano-sized TiO2 particle was discussed in terms of particle deformations. Microstructures and bonding qualities of bonded nano-sized TiO2 particles induced by high velocity collision were examined by high resolution transmission electron microscope (HR-TEM) to verify the MD results. Simulation results demonstrate that the bonding formation of nano-sized TiO2 particles can be attributed to the atomic displacement and lattice distortion in localized impact region of particle boundaries. TEM microstructure results prove simulation results and indicate effective chemical bonding formations between nano-particles at low temperature by high velocity collision. Quantitative results show that the high temperature is beneficial to the particle bonding formation. The asperity around nano-sized ceramic particles surface contributes to the displacement and lattice distortion in localized impact region under the high impact compressive pressure. The fact demonstrates a new mechanism of nano-scale ceramic particle bonding formation induced by the localized atomic displacement. The study present opens up a promising prospect of fabricating functional equipment with nano-scale ceramic particles with high velocity collision at ambient temperature. © 2018 Elsevier Ltd and Techna Group S.r.l.

Keyword :

Atomic displacement Chemical bondings Compressive pressure High velocity collisions MD simulation Molecular dynamics simulations Nano ceramic particles Particle deformation

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GB/T 7714 Yao, Hai-Long , Yang, Guan-Jun , Li, Chang-Jiu . Molecular dynamics simulation and experimental verification for bonding formation of solid-state TiO2 nano-particles induced by high velocity collision [J]. | Ceramics International , 2019 , 45 (4) : 4700-4706 .
MLA Yao, Hai-Long 等. "Molecular dynamics simulation and experimental verification for bonding formation of solid-state TiO2 nano-particles induced by high velocity collision" . | Ceramics International 45 . 4 (2019) : 4700-4706 .
APA Yao, Hai-Long , Yang, Guan-Jun , Li, Chang-Jiu . Molecular dynamics simulation and experimental verification for bonding formation of solid-state TiO2 nano-particles induced by high velocity collision . | Ceramics International , 2019 , 45 (4) , 4700-4706 .
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Thermodynamic conditions for cluster formation in supersaturated boundary layer during plasma spray-physical vapor deposition EI SCIE
期刊论文 | 2019 , 471 , 950-959 | Applied Surface Science
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Abstract :

Plasma spray-physical vapor deposition (PS-PVD) is used to produce columnar microstructure coatings for vapor materials under particular operating parameters. However, due to the particular conditions of PS-PVD, the state of vapor material transported in plasma jet is difficult to predict by experimental method. Moreover, the properties of plasma jet changes sharply when the hot plasma jet approaches a relatively low temperature substrate. It is more difficult to examine the behavior variation of vapor material by experiment. In this work, the thermodynamic condition for state variation of the vapor material along with methods to change this condition were studied. The distribution of plasma temperature near the substrate surface was obtained through simulation and the vapor pressure of vapor materials was calculated by the obtained temperature distribution. The supersaturated boundary layer was obtained from the distribution of the vapor pressure and partial pressure of the vapor atoms. The environment of this supersaturated boundary layer agreed with the thermodynamic conditions of the state variation of vapor materials. Further, this layer could be varied by changing the spraying distance and powder feed rate, thus allowing further control of the state variation of vapor materials. For PS-PVD process, especially for the deposition of columnar coating, it is very important to understand the properties of boundary layer and condensation conditions of vapor materials; this study provides the basis for future research on the transport of materials in the boundary layer. © 2018

Keyword :

Cluster Cluster formations Columnar microstructures Experimental methods Operating parameters Particular condition Plasma temperature Thermodynamic conditions

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GB/T 7714 Liu, Mei-Jun , Zhang, Ke-Jie , Zhang, Qiang et al. Thermodynamic conditions for cluster formation in supersaturated boundary layer during plasma spray-physical vapor deposition [J]. | Applied Surface Science , 2019 , 471 : 950-959 .
MLA Liu, Mei-Jun et al. "Thermodynamic conditions for cluster formation in supersaturated boundary layer during plasma spray-physical vapor deposition" . | Applied Surface Science 471 (2019) : 950-959 .
APA Liu, Mei-Jun , Zhang, Ke-Jie , Zhang, Qiang , Zhang, Meng , Yang, Guan-Jun , Li, Cheng-Xin et al. Thermodynamic conditions for cluster formation in supersaturated boundary layer during plasma spray-physical vapor deposition . | Applied Surface Science , 2019 , 471 , 950-959 .
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Understanding of degradation-resistant behavior of nanostructured thermal barrier coatings with bimodal structure EI SCIE
期刊论文 | 2019 , 35 (3) , 231-238 | Journal of Materials Science and Technology
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Nanostructured thermal barrier coatings (TBCs) often provide high degradation resistance, as well as extended lifetime. However, the underlying mechanism has not been fully understood. In this study, the sintering characteristics of nanostructured yttria-stabilized zirconia (YSZ) coatings were investigated, and compared with those of the conventional YSZ coatings. Multiscale characterizations of the changes in microstructures and properties were performed. Results showed that the enhanced high-performance durability was mainly attributed to different sintering mechanisms of lamellar zones and nanozones. Sintering characteristics of the lamellar zones were similar to those of the conventional coatings. Stage-sensitive healing of two-dimensional (2D) pores dominated the sintering behavior of the lamellar zones. However, the differential densification rates between nanozones and lamellar zones of the nanostructured TBCs led to the formation of coarse voids. This counteractive effect, against healing of 2D pores, was the main factor contributing to the retardation of the performance degradation of bimodal TBCs during thermal exposure. Based on the understanding of the performance-degradation resistance, an outlook towards TBCs with higher performances was presented. © 2018

Keyword :

Bi-modal structures Degradation resistance Microstructures and properties Multiscale characterizations Nanostructured thermal barrier coatings Structural tailoring Thermal barrier coating (TBCs) Yttria-stabilized zirconias (YSZ)

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GB/T 7714 Li, Guangrong , Yang, Guanjun . Understanding of degradation-resistant behavior of nanostructured thermal barrier coatings with bimodal structure [J]. | Journal of Materials Science and Technology , 2019 , 35 (3) : 231-238 .
MLA Li, Guangrong et al. "Understanding of degradation-resistant behavior of nanostructured thermal barrier coatings with bimodal structure" . | Journal of Materials Science and Technology 35 . 3 (2019) : 231-238 .
APA Li, Guangrong , Yang, Guanjun . Understanding of degradation-resistant behavior of nanostructured thermal barrier coatings with bimodal structure . | Journal of Materials Science and Technology , 2019 , 35 (3) , 231-238 .
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Green Solution-Processed Tin-Based Perovskite Films for Lead-Free Planar Photovoltaic Devices SCIE
期刊论文 | 2019 , 11 (3) , 3053-3060 | ACS APPLIED MATERIALS & INTERFACES
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Abstract :

The eco-friendly Sn-based perovskites have attracted more and more attention in lead-free perovskite photovoltaic field. However, the device performance and reproducibility are greatly challenged in preparing high-quality perovskite films. Here, we fabricated uniform and dense Sn-based perovskite films via a green gas pump treatment technology. Remarkably, we successfully fabricated a large area (>20 cm(2)) Sn-based perovskite film with a mirror-like surface, which is the largest Sn-based perovskite film ever reported. Besides, we found that the phase separation phenomenon induced by excess SnF2 was eliminated when the pressure is 1500 Pa. Finally, we fabricated highly reproducible Sn-based solar cells and obtained an inspiring efficiency of 1.85%, which is the highest reported efficiency for Sn-based devices with a configuration of fluorine-doped tin oxide/compact TiO2/perovskite/hole transport material/electrode. Our results demonstrate the feasibility of using gas pump treatment technique to prepare high-quality Sn-based perovskite films, which paves a way for large-scale green manufacturing of Sn-based perovskite solar cells in the future.

Keyword :

green manufacturing gas pump treatment tin-based lead-free perovskite solar cell

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GB/T 7714 Li, Xiao-Lei , Gao, Li-Li , Chu, Qian-Qian et al. Green Solution-Processed Tin-Based Perovskite Films for Lead-Free Planar Photovoltaic Devices [J]. | ACS APPLIED MATERIALS & INTERFACES , 2019 , 11 (3) : 3053-3060 .
MLA Li, Xiao-Lei et al. "Green Solution-Processed Tin-Based Perovskite Films for Lead-Free Planar Photovoltaic Devices" . | ACS APPLIED MATERIALS & INTERFACES 11 . 3 (2019) : 3053-3060 .
APA Li, Xiao-Lei , Gao, Li-Li , Chu, Qian-Qian , Li, Yan , Ding, Bin , Yang, Guan-Jun . Green Solution-Processed Tin-Based Perovskite Films for Lead-Free Planar Photovoltaic Devices . | ACS APPLIED MATERIALS & INTERFACES , 2019 , 11 (3) , 3053-3060 .
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A novel composite-layered coating enabling self-enhancing thermal barrier performance SCIE
期刊论文 | 2019 , 163 , 142-147 | SCRIPTA MATERIALIA
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A novel composite-layered thermal barrier coating is designed to solve performance degradation caused by inevitable thermal exposure. Inspired by cathodic protection with a sacrificial anode, a degradation-resistant thermal barrier was achieved by the spontaneous formation of mesopores. The increment of thermal conductivity decreased from 110% for conventional coatings to 40% for composite coatings, which means 50% self-enhanced thermal insulation was realized. A new mechanism based on effective thermal-resistance was proposed to account for the self-enhanced behavior. The effective area for heat flux prevention was increased from 10 to 30% for 2D micropores to -60% for the newly-formed 2D mesopores. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Keyword :

Plasma spraying Sintering Self-enhanced behavior Thermal barrier coating Thermal conductivity

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GB/T 7714 Li, Guang-Rong , Wang, Li-Shuang , Yang, Guan-Jun . A novel composite-layered coating enabling self-enhancing thermal barrier performance [J]. | SCRIPTA MATERIALIA , 2019 , 163 : 142-147 .
MLA Li, Guang-Rong et al. "A novel composite-layered coating enabling self-enhancing thermal barrier performance" . | SCRIPTA MATERIALIA 163 (2019) : 142-147 .
APA Li, Guang-Rong , Wang, Li-Shuang , Yang, Guan-Jun . A novel composite-layered coating enabling self-enhancing thermal barrier performance . | SCRIPTA MATERIALIA , 2019 , 163 , 142-147 .
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Combined effect of internal and external factors on sintering kinetics of plasma-sprayed thermal barrier coatings SCIE
期刊论文 | 2019 , 39 (5) , 1860-1868 | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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Abstract :

Understanding the sintering kinetics of plasma-sprayed thermal barrier coatings (PS-TBCs) is crucial to retard their performance degradation. However, under real service condition, the sintering kinetics is often affected by multiple factors. This study investigated the sintering kinetics, in a novel scale-progressive view, under the combined-effect of internal and external factors. Results show that the sintering kinetics of PS-TBCs was highly associated with their unique sintering process from nanoscale to microscale. Firstly, sintering leads to nanoscopic roughening of the pore surface. Subsequently, multiple contacts are formed between counter-surfaces. As a result, microscopic healing of pores can be finally observed. In terms of external factors, the temperature further affects the level and rate of nanoscopic roughening. This is responsible for the differences of the microscopic healing ratios, as well as the macroscopic elastic modulus.

Keyword :

Plasma spraying Thermal barrier coatings Temperature-dependent sintering kinetics Scale-progressive evolution Multiple contacts

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GB/T 7714 Li, Guang-Rong , Wang, Li-Shuang , Yang, Guan-Jun et al. Combined effect of internal and external factors on sintering kinetics of plasma-sprayed thermal barrier coatings [J]. | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY , 2019 , 39 (5) : 1860-1868 .
MLA Li, Guang-Rong et al. "Combined effect of internal and external factors on sintering kinetics of plasma-sprayed thermal barrier coatings" . | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY 39 . 5 (2019) : 1860-1868 .
APA Li, Guang-Rong , Wang, Li-Shuang , Yang, Guan-Jun , Li, Cheng-Xin , Li, Chang-Jiu . Combined effect of internal and external factors on sintering kinetics of plasma-sprayed thermal barrier coatings . | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY , 2019 , 39 (5) , 1860-1868 .
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Achieving self-enhanced thermal barrier performance through a novel hybrid-layered coating design SCIE
期刊论文 | 2019 , 167 | MATERIALS & DESIGN
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The thermal insulation and durability of thermal barrier coatings (TBCs) are mainly affected by sintering-induced healing of 2D micropores, which is inevitable under high temperature conditions. In this study, we designed and prepared novel hybrid-layered TBCs. During thermal exposure, the degree of degradation in thermal conductivity is observed to decrease from 80 to 100% for conventional coatings to similar to 20% for the novel coatings. For a detailed understanding, the evolution of the hybrid-layered TBCs can be divided into two stages: during stage I (0-10 h), ultrafast healing of 2D micropores occurs, mainly caused by the multiple contacts between the counter-surface. At this stage, the thermal and mechanical properties also increase sharply. During stage II (after 10 h), some new 2D mesopores are formed. Compared with the 2D micropores, the newly formed 2D mesopores have a much larger aspect ratio that increases the ratio of the effective area for thermal insulation from 10 to 30% to 60%, which accounts for the similar to 50% self-enhancement in the thermal barrier performance. This self-enhancing behavior is expected to prolong the lifetime and increase the performance of the TBCs, which is the main objective of using advanced TBCs in next-generation applications. (C) 2019 Published by Elsevier Ltd.

Keyword :

Sintering Degradation-resistance Thermal barrier coatings Self-enhancing Structure design

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GB/T 7714 Li, Guang-Rong , Wang, Li-Shuang , Yang, Guan-Jun . Achieving self-enhanced thermal barrier performance through a novel hybrid-layered coating design [J]. | MATERIALS & DESIGN , 2019 , 167 .
MLA Li, Guang-Rong et al. "Achieving self-enhanced thermal barrier performance through a novel hybrid-layered coating design" . | MATERIALS & DESIGN 167 (2019) .
APA Li, Guang-Rong , Wang, Li-Shuang , Yang, Guan-Jun . Achieving self-enhanced thermal barrier performance through a novel hybrid-layered coating design . | MATERIALS & DESIGN , 2019 , 167 .
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Sintering characteristics of plasma-sprayed TBCs: Experimental analysis and an overall modelling EI SCIE Scopus
期刊论文 | 2018 , 44 (3) , 2982-2990 | CERAMICS INTERNATIONAL
WoS CC Cited Count: 7 SCOPUS Cited Count: 6
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Abstract :

In this study, sintering behaviour of plasma-sprayed thermal barrier coatings (PS-TBCs) was investigated experimentally and theoretically. Results show that the sintering kinetics of PS-TBCs is highly stage-sensitive. The sintering proceeds significantly faster at initial short thermal exposure (< 20 h), while it slows down dramatically at following long thermal exposure. A detailed examination on microstructural evolution of the PS-TBCs was carried out to understand their sintering behaviour. Results show that, different from the conventional sintering theory, the healing of 2D pores was dominantly responsible for the stage-sensitive sintering kinetics during thermal exposure. In brief, the sintering characteristics of the PS-TBCs are highly structure specific. In addition, a structural model was developed based on the structural characteristics of the PS-TBCs; and the model predicts a well consistent sintering behaviour with experiments. Finally, an outlook towards TBCs with higher performance was put forward.

Keyword :

Plasma spray Sintering Stage-sensitive kinetics Structural tailoring Thermal barrier coatings (TBCs)

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GB/T 7714 Li, Guang-Rong , Yang, Guan-Jun , Li, Cheng-Xin et al. Sintering characteristics of plasma-sprayed TBCs: Experimental analysis and an overall modelling [J]. | CERAMICS INTERNATIONAL , 2018 , 44 (3) : 2982-2990 .
MLA Li, Guang-Rong et al. "Sintering characteristics of plasma-sprayed TBCs: Experimental analysis and an overall modelling" . | CERAMICS INTERNATIONAL 44 . 3 (2018) : 2982-2990 .
APA Li, Guang-Rong , Yang, Guan-Jun , Li, Cheng-Xin , Li, Chang-Jiu . Sintering characteristics of plasma-sprayed TBCs: Experimental analysis and an overall modelling . | CERAMICS INTERNATIONAL , 2018 , 44 (3) , 2982-2990 .
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Substrate-constrained effect on the stiffening behavior of lamellar thermal barrier coatings EI SCIE Scopus
期刊论文 | 2018 , 38 (6) , 2579-2587 | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
WoS CC Cited Count: 3 SCOPUS Cited Count: 6
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Abstract :

Thermal exposure would compromises the compliance and thermal insulating performance of thermal barrier coatings (TBCs). However, most publications were based on free-standing coatings in which the stress resulting from substrate is essentially different from TBCs on superalloy substrate. In this paper, the constrained effect of substrate on the ceramic top-coat of plasma sprayed lamellar TBCs was investigated. Results showed that the structural changes evolve from micro-scale to macro-scale during thermal exposure. In a relatively shorter thermal exposure stage, the inter-splat pores became narrowed, whereas the intra-splat cracks became widened. Consequently, the healing kinetics of inter-splat pores was much faster than that of the intra-splat cracks. In a relatively longer thermal exposure stage, some macroscale cracks appeared in coating surface owing to the gradually stiffening coatings. As a result, the microscale intra-splat cracks near the macroscale cracks were healed rapidly. In brief, the substrate constraint induced structural changes were stage sensitive.

Keyword :

Constrained healing Stiffening Structural evolution Substrate constraint Thermal barrier coatings

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GB/T 7714 Li, Guang-Rong , Lei, Juan , Yang, Guan-Jun et al. Substrate-constrained effect on the stiffening behavior of lamellar thermal barrier coatings [J]. | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY , 2018 , 38 (6) : 2579-2587 .
MLA Li, Guang-Rong et al. "Substrate-constrained effect on the stiffening behavior of lamellar thermal barrier coatings" . | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY 38 . 6 (2018) : 2579-2587 .
APA Li, Guang-Rong , Lei, Juan , Yang, Guan-Jun , Li, Cheng-Xin , Li, Chang-Jiu . Substrate-constrained effect on the stiffening behavior of lamellar thermal barrier coatings . | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY , 2018 , 38 (6) , 2579-2587 .
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Epitaxial growth and cracking of highly tough 7YSZ splats by thermal spray technology SCIE Scopus
期刊论文 | 2018 , 7 (1) , 17-29 | JOURNAL OF ADVANCED CERAMICS
WoS CC Cited Count: 8 SCOPUS Cited Count: 10
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Abstract :

Thermally sprayed coatings are essentially layered materials and contain large numbers of lamellar pores. It is thus quite necessary to clarify the formation mechanism of lamellar pores which significantly influence coating performances. In the present study, to elaborate the formation mechanism of lamellar pores, the yttria-stabilized zirconia (ZrO2-7 wt% Y2O3, 7YSZ) splats, which have high fracture toughness and tetragonal phase stability, were employed. Interestingly, anomalous epitaxial growth occurred for all deposition temperatures in spite of the extremely high cooling rate, which clearly indicated chemical bonding and complete contact at splat/substrate interface before splat cooling. However, transverse spallation substantially occurred for all deposition temperatures in spite of the high fracture toughness of 7YSZ, which revealed that the lamellar pores were from transverse cracking/spallation due to the large stress during splat cooling. Additionally, fracture mechanics analysis was carried out, and it was found that the stress arose from the constraint effect of the shrinkage of the splat by locally heated substrate with the value about 1.97 GPa. This clearly demonstrated that the stress was indeed large enough to drive transverse cracking/spallation forming lamellar pores during splat cooling. All of these contribute to understanding the essential features of lamellar bonding and further tailoring the coating structures and performance.

Keyword :

crack patterns epitaxial growth locally heated substrate stress transverse cracking/spallation

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GB/T 7714 Chen, Lin , Yang, Guan-Jun . Epitaxial growth and cracking of highly tough 7YSZ splats by thermal spray technology [J]. | JOURNAL OF ADVANCED CERAMICS , 2018 , 7 (1) : 17-29 .
MLA Chen, Lin et al. "Epitaxial growth and cracking of highly tough 7YSZ splats by thermal spray technology" . | JOURNAL OF ADVANCED CERAMICS 7 . 1 (2018) : 17-29 .
APA Chen, Lin , Yang, Guan-Jun . Epitaxial growth and cracking of highly tough 7YSZ splats by thermal spray technology . | JOURNAL OF ADVANCED CERAMICS , 2018 , 7 (1) , 17-29 .
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