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学者姓名：杨冠军
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Abstract ：
The unique columnar structure endows thermal barrier coatings (TBCs) prepared by plasma spray-physical vapor deposition (PS-PVD) with high thermal insulation and long lifetime. However, the coating delamination failure resulting from an intra-column fracture (within a column rather than between columns) is a bottleneck in the solid dust particle impact environment for aero-engine. To clarify the intra-column fracture mechanism, a basic layer deposition model is developed to explore a heterogeneous weak-to-strong layered structure formed by a local transient in-situ deposit temperature. During the PS-PVD, an in-situ deposit surface is continuously updated due to constantly being covered by vapor condensation, showing a transient temperature, which means that the in-situ deposit surface temperature rises sharply in short period of 0.2 s of depositing a thin layer during a single pass. Meanwhile, the increasing temperature of the in-situ deposit surface results in an experimentally observed heterogeneous weak-to-strong structure, showing a continuous transition from a porous weak structure at the bottom region to a dense strong structure at the top region. This structure easily makes the intra-column fracture at the porous weak region. The results shed light on improving TBC lifetime by restraining the intra-column fracture.
Keyword ：
fracture mechanism heterogeneous layered structure in-situ deposit surface plasma spray-physical vapor deposition (PS-PVD) transient temperature
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| GB/T 7714 | Lu, Yan-Hong , Huang, Lu , Liu, Mei-Jun et al. Heterogeneous layered structure in thermal barrier coatings by plasma spray-physical vapor deposition [J]. | JOURNAL OF ADVANCED CERAMICS , 2023 , 12 (2) : 386-398 . |
| MLA | Lu, Yan-Hong et al. "Heterogeneous layered structure in thermal barrier coatings by plasma spray-physical vapor deposition" . | JOURNAL OF ADVANCED CERAMICS 12 . 2 (2023) : 386-398 . |
| APA | Lu, Yan-Hong , Huang, Lu , Liu, Mei-Jun , Yang, Guan-Jun , Li, Chang-Jiu . Heterogeneous layered structure in thermal barrier coatings by plasma spray-physical vapor deposition . | JOURNAL OF ADVANCED CERAMICS , 2023 , 12 (2) , 386-398 . |
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Abstract ：
In this study, cold spraying was introduced to produce an Al deposit on a Cu substrate, which was then modified through a solid-state method named friction-stir-processing (FSP). The pores and inter-particle interfaces within the Al deposit completely disappeared after FSP at traverse speeds less than 18 mm/min. Equiaxed grains containing a low density of dislocations occurred in the Al deposit after FSP. The grain size increased, while the dislocation density decreased with decreasing traverse speed. Meanwhile, three intermetallic compound (IMC) layers including Al2Cu, AlCu, and Al4Cu9 were developed at the Al/Cu interface after FSP. The thickness of the entire IMC layers and the continuity of the AlCu layer increased as the traverse speed was reduced. Due to the generation of the IMC layers, the adhesion strength of the deposit dramatically improved after FSP. The variation of the adhesion strength after FSP at different traverse speeds was associated with the continuity of the AlCu layer. The electrical conductivity of the Al deposit was remarkably enhanced after FSP due to the disappearance of pores and inter-particle interfaces. Furthermore, the changes in the electrical conductivity of the Al deposit and Al-Cu bimetallic structure after FSP at different traverse speeds were related to the number of grain boundaries and the thickness of IMC layers, respectively.
Keyword ：
adhesion strength cold-sprayed Al deposite Cu substrate electrical conductivity friction-stir-processing
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| GB/T 7714 | Ji, Gang , Liu, Hong , Yang, Guan-Jun et al. Improving Adhesion Strength and Electrical Conductivity of Cold-Sprayed Al Deposit on Cu Substrate Through Friction-Stir-Processing [J]. | JOURNAL OF THERMAL SPRAY TECHNOLOGY , 2022 , 31 (6) : 1813-1826 . |
| MLA | Ji, Gang et al. "Improving Adhesion Strength and Electrical Conductivity of Cold-Sprayed Al Deposit on Cu Substrate Through Friction-Stir-Processing" . | JOURNAL OF THERMAL SPRAY TECHNOLOGY 31 . 6 (2022) : 1813-1826 . |
| APA | Ji, Gang , Liu, Hong , Yang, Guan-Jun , Luo, Xiao-Tao , Li, Cheng-Xin , Sun, Yu-Feng et al. Improving Adhesion Strength and Electrical Conductivity of Cold-Sprayed Al Deposit on Cu Substrate Through Friction-Stir-Processing . | JOURNAL OF THERMAL SPRAY TECHNOLOGY , 2022 , 31 (6) , 1813-1826 . |
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Abstract ：
Thermal barrier coatings (TBCs) can effectively protect the alloy substrate of hot components in aeroengines or land-based gas turbines by the thermal insulation and corrosion/erosion resistance of the ceramic top coat. However, the continuous pursuit of a higher operating temperature leads to degradation, delamination, and premature failure of the top coat. Both new ceramic materials and new coating structures must be developed to meet the demand for future advanced TBC systems. In this paper, the latest progress of some new ceramic materials is first reviewed. Then, a comprehensive spalling mechanism of the ceramic top coat is summarized to understand the dependence of lifetime on various factors such as oxidation scale growth, ceramic sintering, erosion, and calcium-magnesium-aluminium-silicate (CMAS) molten salt corrosion. Finally, new structural design methods for high-performance TBCs are discussed from the perspectives of lamellar, columnar, and nanostructure inclusions. The latest developments of ceramic top coat will be presented in terms of material selection, structural design, and failure mechanism, and the comprehensive guidance will be provided for the development of next-generation advanced TBCs with higher temperature resistance, better thermal insulation, and longer lifetime.
Keyword ：
ceramic material degradation and failure long lifetime structure design thermal barrier coatings (TBCs)
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| GB/T 7714 | Wei, Zhi-Yuan , Meng, Guo-Hui , Chen, Lin et al. Progress in ceramic materials and structure design toward advanced thermal barrier coatings [J]. | JOURNAL OF ADVANCED CERAMICS , 2022 , 11 (7) : 985-1068 . |
| MLA | Wei, Zhi-Yuan et al. "Progress in ceramic materials and structure design toward advanced thermal barrier coatings" . | JOURNAL OF ADVANCED CERAMICS 11 . 7 (2022) : 985-1068 . |
| APA | Wei, Zhi-Yuan , Meng, Guo-Hui , Chen, Lin , Li, Guang-Rong , Liu, Mei-Jun , Zhang, Wei-Xu et al. Progress in ceramic materials and structure design toward advanced thermal barrier coatings . | JOURNAL OF ADVANCED CERAMICS , 2022 , 11 (7) , 985-1068 . |
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Abstract ：
The incorporation of electron transport layers based on single-crystalline TiO2 rhombohedral nanoparticles enables the realization of stable and efficient large-area perovskite solar cell modules. Despite the remarkable progress in power conversion efficiency of perovskite solar cells, going from individual small-size devices into large-area modules while preserving their commercial competitiveness compared with other thin-film solar cells remains a challenge. Major obstacles include reduction of both the resistive losses and intrinsic defects in the electron transport layers and the reliable fabrication of high-quality large-area perovskite films. Here we report a facile solvothermal method to synthesize single-crystalline TiO2 rhombohedral nanoparticles with exposed (001) facets. Owing to their low lattice mismatch and high affinity with the perovskite absorber, their high electron mobility and their lower density of defects, single-crystalline TiO2 nanoparticle-based small-size devices achieve an efficiency of 24.05% and a fill factor of 84.7%. The devices maintain about 90% of their initial performance after continuous operation for 1,400 h. We have fabricated large-area modules and obtained a certified efficiency of 22.72% with an active area of nearly 24 cm(2), which represents the highest-efficiency modules with the lowest loss in efficiency when scaling up.
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| GB/T 7714 | Ding, Yong , Ding, Bin , Kanda, Hiroyuki et al. Single-crystalline TiO2 nanoparticles for stable and efficient perovskite modules [J]. | NATURE NANOTECHNOLOGY , 2022 , 17 (6) : 598-+ . |
| MLA | Ding, Yong et al. "Single-crystalline TiO2 nanoparticles for stable and efficient perovskite modules" . | NATURE NANOTECHNOLOGY 17 . 6 (2022) : 598-+ . |
| APA | Ding, Yong , Ding, Bin , Kanda, Hiroyuki , Usiobo, Onovbaramwen Jennifer , Gallet, Thibaut , Yang, Zhenhai et al. Single-crystalline TiO2 nanoparticles for stable and efficient perovskite modules . | NATURE NANOTECHNOLOGY , 2022 , 17 (6) , 598-+ . |
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Abstract ：
Atmospheric plasma sprayed dense Si coatings have excellent potential for high-temperature oxidation resistance. However, numerous isolated spherical particles on the coating surface result in rapid oxidation and a large local TGO thickness. In the present study, isolated particle healing (IPH) treatment was proposed to eliminate these isolated particles. Then, the related structure evolution and oxidation kinetics of Si coatings were investigated. Finally, the failure mechanism of TGO after oxidation was identified. The results show that the IPH treatment makes isolated particles diffuse, connect with and then immerse themselves into the bulk coating surface, thereby contributing to both surface smoothing and coating densification. Consequently, the localized large thickness in the TGO scale is eliminated, and the overall oxidation rates of the IPH Si coating decrease by ∼24% compared with the as-sprayed coating. The β→α phase transformation of polymorphic cristobalite with a volume reduction of ∼4.5% is the main cause for TGO channel cracking and is not suppressed by IPH treatment, which points out future directions for better antioxidant Si coatings. © 2022 Xi'an Jiaotong University
Keyword ：
Cracking; IPH treatment; Oxidation rate; Phase transformation; Si coating
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| GB/T 7714 | Chen, L. , Li, J.-H. , Wang, G.-Q. et al. Improving oxidation resistance of Si coating by isolated-particle healing [J]. | Corrosion Communications , 2022 , 8 : 9-17 . |
| MLA | Chen, L. et al. "Improving oxidation resistance of Si coating by isolated-particle healing" . | Corrosion Communications 8 (2022) : 9-17 . |
| APA | Chen, L. , Li, J.-H. , Wang, G.-Q. , Bo, Y.-F. , Yang, G.-J. . Improving oxidation resistance of Si coating by isolated-particle healing . | Corrosion Communications , 2022 , 8 , 9-17 . |
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Abstract ：
The biggest bottleneck delaying the practical applications of organic thermoelectric devices is the lack of high-performance n-type semiconductors with high air stability. Herein, we report an n-type metal-organic coordination complex (Br-C6H4-NH2)(2)CuBr2. This material exhibits an exceptionally high room-temperature electrical conductivity of >3990 S cm(-1), leading to a giant power factor of >1589 mu W m(-1) K-2, which is the highest value for organic thermoelectric materials. Besides, the (Br-C6H4-NH2)(2)CuBr2 film retained 87.8 per cent of the original electrical conductivity after being stored in air for 109 days, which is a record-breaking value for an n-type organic TE material. More surprisingly, we find that this substance does not decompose even after immersion in pure water for 405 days. We demonstrate that the giant power factor mainly arises from an ultrahigh electrical conductivity, which mainly comes from the efficient electron transfer from Br-C6H4-NH2 to CuBr2. This work opens a new era for solving the long-standing key challenges of achieving air-stable and high-performance n-type organic thermoelectric materials.
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| GB/T 7714 | Li, Xiaolei , Zhang, Gao , Zhang, Xin et al. Giant power factor and high air stability in an n-type metal-organic charge-transfer complex [J]. | JOURNAL OF MATERIALS CHEMISTRY A , 2022 , 10 (47) : 25019-25028 . |
| MLA | Li, Xiaolei et al. "Giant power factor and high air stability in an n-type metal-organic charge-transfer complex" . | JOURNAL OF MATERIALS CHEMISTRY A 10 . 47 (2022) : 25019-25028 . |
| APA | Li, Xiaolei , Zhang, Gao , Zhang, Xin , Zou, Weitian , Li, Ge , Liang, Jia et al. Giant power factor and high air stability in an n-type metal-organic charge-transfer complex . | JOURNAL OF MATERIALS CHEMISTRY A , 2022 , 10 (47) , 25019-25028 . |
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Abstract ：
As one of the most competitive light-harvesting materials, organometal halide perovskites have attracted great attention due to their low-cost and top-down solution fabricability. However, the instability of perovskites in a moist environment reduces the potential for their commercialization. In this study, novel 2,4-fluorobenzylamine (FBA) was employed as the passivation material, which could successfully suppress the defects and improve the moisture resistance of perovskites, resulting in an ultrahigh power conversion efficiency of 17.6% for the carbon-based perovskite solar cells with good stability. Meanwhile, the whole process of interactions between the H2O molecule and the perovskite lattice was first elucidated by density functional theory calculations, which demonstrated the underlying mechanism of the improvement of moisture stability with the FBA treatment. This work opens up a new route toward addressing the main obstacles in the practical application of perovskite devices under ambient conditions.
Keyword ：
carrier transport defect density control difluorobenzylamine passivation high-performance perovskite solar cell hydrophobic group
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| GB/T 7714 | Chu, Qian-Qian , Sun, Zhijian , Liu, Yan et al. Difluorobenzylamine Treatment of Organolead Halide Perovskite Boosts the High Efficiency and Stability of Photovoltaic Cells [J]. | ACS APPLIED MATERIALS & INTERFACES , 2022 , 14 (9) : 11388-11397 . |
| MLA | Chu, Qian-Qian et al. "Difluorobenzylamine Treatment of Organolead Halide Perovskite Boosts the High Efficiency and Stability of Photovoltaic Cells" . | ACS APPLIED MATERIALS & INTERFACES 14 . 9 (2022) : 11388-11397 . |
| APA | Chu, Qian-Qian , Sun, Zhijian , Liu, Yan , Cui, Hao , Cheng, Bo , Dastan, Davoud et al. Difluorobenzylamine Treatment of Organolead Halide Perovskite Boosts the High Efficiency and Stability of Photovoltaic Cells . | ACS APPLIED MATERIALS & INTERFACES , 2022 , 14 (9) , 11388-11397 . |
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Abstract ：
Thermal barrier coatings (TBCs) suffer from spalling failure resulting from the rapid growth of thermally grown oxides (TGO) on the metallic bond coat. In this study, to achieve the optimal lifetime of TBCs, a lifetime phase diagram was constructed for the entire service of TBCs. Herein, both the thermal mismatch stress during thermal cycling and the TGO growth stress during thermal exposure were considered. First, thickening behavior of the Al 2 O 3 scale related to grain size was investigated. Second, transverse delamination failure due to the thermal mismatch stress was analyzed. Third, vertical cracking failure related to early scale growth was explored. Finally, a critical scale grain size of similar to 2.5 mu m was identified for achieving the optimal lifetime of TBCs. It was experimentally proved that vertical cracking of the Al 2 O 3 scale occurred during early oxidation as the scale grain size was larger than similar to 4 mu m after pre-oxidation. The proposed lifetime phase diagram and critical scale grain size effect serve as novel criteria for the design of next-generation durable TBCs. (c) 2022 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
Keyword ：
Channel cracking Grain boundaries Grain size Service lifetime TGO growth
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| GB/T 7714 | Chen, Lin , Meng, Guo-Hui , Li, Chang-Jiu et al. Critical scale grain size for optimal lifetime of TBCs [J]. | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY , 2022 , 115 : 241-250 . |
| MLA | Chen, Lin et al. "Critical scale grain size for optimal lifetime of TBCs" . | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 115 (2022) : 241-250 . |
| APA | Chen, Lin , Meng, Guo-Hui , Li, Chang-Jiu , Yang, Guan-Jun . Critical scale grain size for optimal lifetime of TBCs . | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY , 2022 , 115 , 241-250 . |
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Abstract ：
Air plasma sprayed thermal barrier coatings (APS-TBCs) saw their wide application in high-temperature-related cutting-edge fields. The lamellar structure of APS-TBCs provides a significant advantage on thermal insulation. However, short life span is a major headache for APS-TBCs. This is highly related to the property changes and passive behaviors of the coatings during thermal service. Herein, a finite element model was developed to investigate the dynamic stiffening and substrate constraint on total spallation process. Results show that the stiffening accelerates the crack propagation of APS-TBCs. The driving force for crack propagation, which is characterized by strain energy release rate (SERR), is significantly enlarged. Consequently, the crack starts to propagate when the SERR exceeds the fracture toughness. In addition, the changing trends of SERR and crack propagation features are highly associated with temperatures. A higher temperature corresponds to more significant effect of stiffening on substrate constraint. In brief, temperature-dependent stiffening significantly aggravates the substrate constraint effect on APS-TBCs, which is one of the major causes for the spallation. Given that, lowering stiffening degree is essential to maintain high strain tolerance, and to further extend the life span of APS-TBCs. This understanding contributes to the development of advanced TBCs in future applications. © 2020
Keyword ：
Crack propagation Cracks Fracture toughness Lamellar structures Plasma spraying Spalling Sprayed coatings Strain energy Strain rate Thermal barrier coatings Thermal insulation
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| GB/T 7714 | Li, Guangrong , Tang, Chunhua , Yang, Guanjun . Dynamic-stiffening-induced aggravated cracking behavior driven by metal-substrate-constraint in a coating/substrate system [J]. | Journal of Materials Science and Technology , 2021 , 65 : 154-163 . |
| MLA | Li, Guangrong et al. "Dynamic-stiffening-induced aggravated cracking behavior driven by metal-substrate-constraint in a coating/substrate system" . | Journal of Materials Science and Technology 65 (2021) : 154-163 . |
| APA | Li, Guangrong , Tang, Chunhua , Yang, Guanjun . Dynamic-stiffening-induced aggravated cracking behavior driven by metal-substrate-constraint in a coating/substrate system . | Journal of Materials Science and Technology , 2021 , 65 , 154-163 . |
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Abstract ：
High density of the top coat of environmental barrier coatings (EBC) is important for ensuring its performance in water vapor environment, which is also significant for prolonging service lifetime of SiCf/SiC aero-engine hot components. In this work, densification of the top coat of EBC was achieved by pre-heat treatment. In detail, the as-sprayed porous Yb2SiO5 coatings were heat-treated at the high temperature of 1250 to 1450 , which improve the density significantly. Changes in microstructure and mechanical properties during the pre-heat treatment were studied by classifying defects into different types. The processes of defects-healing were observed, and the mechanism responsible for coating densification was revealed. Results show that the porosity of as-sprayed Yb2SiO5 coating is high due to the existence of three types of micro-defects, including two-dimensional (2D) inter-splat pores, 2D intra-splat cracks and three-dimensional (3D) spherical pores. During the pre-heat treatment process, 2D defects are healed to be reduced in a large amount in a short duration, while the 3D spherical pores seem unchanged. The mechanism of defects-healing in the heat treatment process is that grain growth inside the coating makes surface of the pores rough, which leads to multiple bridge-connection of 2D pores. As a result, the original continuous defects are divided into several sections and are further spheroidized. The method of pre-heat treatment for APS-EBC would make a fundamental contribution to its further engineering application. © 2021, Journal of Materials Engineering. All right reserved.
Keyword ：
Aircraft engines Densification Grain growth Heat treatment Plasma jets Plasma spraying Silicon Silicon compounds Sprayed coatings
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| GB/T 7714 | Yang, Bo , Li, Guang-Rong , Xu, Tong et al. Densification method of air-plasma-sprayed environmental barrier coatings achieved by pre-heat treatment [J]. | Journal of Materials Engineering , 2021 , 49 (11) : 116-124 . |
| MLA | Yang, Bo et al. "Densification method of air-plasma-sprayed environmental barrier coatings achieved by pre-heat treatment" . | Journal of Materials Engineering 49 . 11 (2021) : 116-124 . |
| APA | Yang, Bo , Li, Guang-Rong , Xu, Tong , Yang, Guan-Jun . Densification method of air-plasma-sprayed environmental barrier coatings achieved by pre-heat treatment . | Journal of Materials Engineering , 2021 , 49 (11) , 116-124 . |
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