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学者姓名:杨冠军

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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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Abstract :

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 等. "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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Thermodynamic conditions for cluster formation in supersaturated boundary layer during plasma spray-physical vapor deposition EI
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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Imaging Slit Pores Under Delaminated Splats by White Light Interference EI SCIE Scopus
期刊论文 | 2018 , 27 (3) , 319-335 | JOURNAL OF THERMAL SPRAY TECHNOLOGY
WoS CC Cited Count: 3
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Abstract :

The slit pores under delaminated films significantly contribute to the properties of the film and the coating. In the present study, a novel and practical technique, the white light interference method, is proposed to characterize the slit pores covered by the 8YSZ and LZ splats. In this method, only an ordinary optical microscopy (OM) is used. Interestingly, colorful Newton's rings and parabolic shapes of the slit pores were clearly observed by OM. The crack spacing and the shapes of the slit pores captured by OM were in good agreement with those obtained by scanning electron microscopy and focus ion beam. Moreover, this is the first time when successful quantitative imaging of the slit pores under the thermal spray splats is achieved. Besides, mechanical analyses were carried out, and the results were consistent with those obtained by OM. In addition, the essential fact that the slit pores were mainly caused by transverse cracking/delamination in the thermal spray coatings was clarified. These results indicate that white light interference is an excellent method to characterize the slit pores under smooth and transparent films.

Keyword :

crack patterns parabolic shapes delamination slit pores crack spacing white light interference

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GB/T 7714 Chen, Lin , Gao, Li-li , Yang, Guan-Jun . Imaging Slit Pores Under Delaminated Splats by White Light Interference [J]. | JOURNAL OF THERMAL SPRAY TECHNOLOGY , 2018 , 27 (3) : 319-335 .
MLA Chen, Lin et al. "Imaging Slit Pores Under Delaminated Splats by White Light Interference" . | JOURNAL OF THERMAL SPRAY TECHNOLOGY 27 . 3 (2018) : 319-335 .
APA Chen, Lin , Gao, Li-li , Yang, Guan-Jun . Imaging Slit Pores Under Delaminated Splats by White Light Interference . | JOURNAL OF THERMAL SPRAY TECHNOLOGY , 2018 , 27 (3) , 319-335 .
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Epitaxial Growth and Cracking Mechanisms of Thermally Sprayed Ceramic Splats EI SCIE Scopus
期刊论文 | 2018 , 27 (3) , 255-268 | JOURNAL OF THERMAL SPRAY TECHNOLOGY
WoS CC Cited Count: 2
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Abstract :

In the present study, the epitaxial growth and cracking mechanisms of thermally sprayed ceramic splats were explored. We report, for the first time, the epitaxial growth of various splat/substrate combinations at low substrate temperatures (100 A degrees C) and large lattice mismatch (- 11.26%). Our results suggest that thermal spray deposition was essentially a liquid-phase epitaxy, readily forming chemical bonding. The interface temperature was also estimated. The results convincingly demonstrated that atoms only need to diffuse and rearrange over a sufficiently short range during extremely rapid solidification. Concurrently, severe cracking occurred in the epitaxial splat/substrate systems, which indicated high tensile stress was produced during splat deposition. The origin of the tensile stress was attributed to the strong constraint of the locally heated substrate by its cold surroundings.

Keyword :

epitaxial growth substrate temperature lattice mismatch crystallographic orientation cracking

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GB/T 7714 Chen, Lin , Yang, Guan-jun . Epitaxial Growth and Cracking Mechanisms of Thermally Sprayed Ceramic Splats [J]. | JOURNAL OF THERMAL SPRAY TECHNOLOGY , 2018 , 27 (3) : 255-268 .
MLA Chen, Lin et al. "Epitaxial Growth and Cracking Mechanisms of Thermally Sprayed Ceramic Splats" . | JOURNAL OF THERMAL SPRAY TECHNOLOGY 27 . 3 (2018) : 255-268 .
APA Chen, Lin , Yang, Guan-jun . Epitaxial Growth and Cracking Mechanisms of Thermally Sprayed Ceramic Splats . | JOURNAL OF THERMAL SPRAY TECHNOLOGY , 2018 , 27 (3) , 255-268 .
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Hetero-Orientation Epitaxial Growth of TiO2 Splats on Polycrystalline TiO2 Substrate EI SCIE Scopus
期刊论文 | 2018 , 27 (5) , 880-897 | JOURNAL OF THERMAL SPRAY TECHNOLOGY
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Abstract :

In the present study, the effect of titania (TiO2) substrate grain size and orientation on the epitaxial growth of TiO2 splat was investigated. Interestingly, the splat presented comparable grain size with that of substrate, indicating the hereditary feature of grain size. In addition, hetero- and homo-orientation epitaxial growth was observed at deposition temperatures below 400 A degrees C and above 500 A degrees C, respectively. The preferential growth of high-energy (001) face was also observed at low deposition temperatures (<= 400 A degrees C), which was found to result from dynamic nonequilibrium effect during the thermal spray deposition. Moreover, thermal spray deposition paves the way for a new approach to prepare high-energy (001) facets of TiO2 crystals.

Keyword :

deposition temperature crystal morphology homo-orientation epitaxial growth preferential growth hereditary feature hetero-orientation epitaxial growth

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GB/T 7714 Chen, Lin , Yang, Guan-Jun . Hetero-Orientation Epitaxial Growth of TiO2 Splats on Polycrystalline TiO2 Substrate [J]. | JOURNAL OF THERMAL SPRAY TECHNOLOGY , 2018 , 27 (5) : 880-897 .
MLA Chen, Lin et al. "Hetero-Orientation Epitaxial Growth of TiO2 Splats on Polycrystalline TiO2 Substrate" . | JOURNAL OF THERMAL SPRAY TECHNOLOGY 27 . 5 (2018) : 880-897 .
APA Chen, Lin , Yang, Guan-Jun . Hetero-Orientation Epitaxial Growth of TiO2 Splats on Polycrystalline TiO2 Substrate . | JOURNAL OF THERMAL SPRAY TECHNOLOGY , 2018 , 27 (5) , 880-897 .
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Low-temperature SnO2-modified TiO2 yields record efficiency for normal planar perovskite solar modules EI SCIE Scopus
期刊论文 | 2018 , 6 (22) , 10233-10242 | JOURNAL OF MATERIALS CHEMISTRY A
WoS CC Cited Count: 1
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Abstract :

Hybrid organic-inorganic perovskite solar cells (PSCs), particularly planar PSCs, have attracted significant attention because of their high efficiency, low fabrication costs, and simple preparation process. However, planar PSCs exhibit lower efficiency and stability than mesoporous PSCs primarily owing to defects in the electron transport layer (ETU. Herein, we introduced a SnO2 nanoparticle-modified TiO2 film (SnO2@TiO2) as an ETL. In addition, we proposed a simple three-step chemical bath method to achieve this SnO2@TiO2 structure at low temperatures (140 degrees C). The SnO2@TiO2 ETL significantly enhances electron extraction and decreases the trap states at the perovskite/ETL interface. We achieved average efficiencies of 21.27%, 19.79%, 17.21%, and 16.31% at the reverse scan and forward scan for the device areas of 0.10 cm(2), 1.13 cm(2), 5.25 cm(2), and 10.56 cm(2), respectively. Moreover, we achieved a certificated efficiency of 15.65% for a normal planar perovskite solar module with a masked area of 10.55 cm(2). The SnO2@TiO2-based PSCs exhibit enhanced photocurrent and reduced hysteresis. Furthermore, the solar cell retained about 89% of its initial efficiency after about 750 hours of aging in dark and about 93% for 528 hours under full-sun illumination. Owing to the [ow-temperature processability and the absence of spin-coating steps, SnO2@TiO2 ETLs will provide a promising path for the commercialization of PSCs.

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GB/T 7714 Ding, Bin , Huang, Shi-Yu , Chu, Qian-Qian et al. Low-temperature SnO2-modified TiO2 yields record efficiency for normal planar perovskite solar modules [J]. | JOURNAL OF MATERIALS CHEMISTRY A , 2018 , 6 (22) : 10233-10242 .
MLA Ding, Bin et al. "Low-temperature SnO2-modified TiO2 yields record efficiency for normal planar perovskite solar modules" . | JOURNAL OF MATERIALS CHEMISTRY A 6 . 22 (2018) : 10233-10242 .
APA Ding, Bin , Huang, Shi-Yu , Chu, Qian-Qian , Li, Yan , Li, Cheng-Xin , Li, Chang-Jiu et al. Low-temperature SnO2-modified TiO2 yields record efficiency for normal planar perovskite solar modules . | JOURNAL OF MATERIALS CHEMISTRY A , 2018 , 6 (22) , 10233-10242 .
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Tuning Nucleation Sites to Enable Monolayer Perovskite Films for Highly Efficient Perovskite Solar Cells SCIE
期刊论文 | 2018 , 8 (11) | COATINGS
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The nucleation site plays a critical role in achieving the full coverage of perovskite film at both the macroscopic and microscopic scales, and it is systematically investigated for the first time in this study. The results show that under natural conditions, the incomplete coverage of perovskite film is due to both heterogeneous nucleation and homogeneous nucleation. The established concentration field and temperature field in the precursor solution show that there are two preferential nucleation sites, i.e., the upper surface of the precursor solution (homogeneous nucleation) and the surface of the substrate (heterogeneous nucleation). The nucleation sites are tuned by decreasing the drying pressure from the atmosphere to 3000 Pa, and then to 100 Pa, and then the microstructures of the perovskite films change from an incomplete coverage state to a monolayer full coverage state, and then to a bilayer full coverage state. At last, when the full coverage perovskite films are assembled into perovskite solar cells, the photovoltaic performance of the monolayer perovskite solar cells is slightly greater than that of the bilayer perovskite solar cells. The electrochemical characterization shows that there is more restrained internal recombination of the monolayer perovskite solar cells compared with bilayer perovskite solar cells.

Keyword :

crystallization nucleation site perovskite film full coverage microstructure

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GB/T 7714 Li, Yan , Li, Xiaolei , Chu, Qianqian et al. Tuning Nucleation Sites to Enable Monolayer Perovskite Films for Highly Efficient Perovskite Solar Cells [J]. | COATINGS , 2018 , 8 (11) .
MLA Li, Yan et al. "Tuning Nucleation Sites to Enable Monolayer Perovskite Films for Highly Efficient Perovskite Solar Cells" . | COATINGS 8 . 11 (2018) .
APA Li, Yan , Li, Xiaolei , Chu, Qianqian , Dong, Hui , Yao, Jiantao , Zhou, Yong et al. Tuning Nucleation Sites to Enable Monolayer Perovskite Films for Highly Efficient Perovskite Solar Cells . | COATINGS , 2018 , 8 (11) .
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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: 5 SCOPUS Cited Count: 8
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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 :

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

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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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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: 2 SCOPUS Cited Count: 4
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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 Substrate constraint Stiffening Thermal barrier coatings Structural evolution

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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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Highly oxidation resistant and cost effective MCrAlY bond coats prepared by controlled atmosphere heat treatment EI SCIE Scopus
期刊论文 | 2018 , 347 , 54-65 | SURFACE & COATINGS TECHNOLOGY
WoS CC Cited Count: 1
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Abstract :

MCrAlY bond coats with high oxidation resistance are essentially important for improving the life-time of thermal barrier coatings (TBCs). In this study, highly oxidation resistant MCrAlY bond coats were prepared by a cost-effective approach involving air plasma spraying (APS) followed by a controlled atmosphere heat treatment (a diffusion treatment performed in a furnace filled with Ar). The results confirmed that a pure alpha-Al2O3 thermally grown oxide (TGO) was successfully formed on the surface of the heat-treated APS bond coats during isothermal oxidation. The oxidation resistance of the resulting APS bond coats was as high as that of low-pressure plasma sprayed bond coats, which are very expensive. The high oxidation resistance of the APS bond coats fabricated in this study can be attributed to the structural changes of the interface between the splats inside the coating. During the controlled atmosphere heat treatment, the lamellar oxides present between the splats within the as-sprayed APS bond coats converted into isolated oxide particles, and the metal elements could diffuse freely within the coating after the healing of the interface between the lamellar splats. The effect of the changes in the interfacial microstructure of the bond coats on the growth of the TGO was discussed.

Keyword :

Air plasma spraying Thermal barrier coatings Isothermal oxidation Thermally grown oxide Controlled atmosphere heat treatment MCrAlY bond coat

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GB/T 7714 Meng, Guo-Hui , Zhang, Bang-Yan , Liu, Hong et al. Highly oxidation resistant and cost effective MCrAlY bond coats prepared by controlled atmosphere heat treatment [J]. | SURFACE & COATINGS TECHNOLOGY , 2018 , 347 : 54-65 .
MLA Meng, Guo-Hui et al. "Highly oxidation resistant and cost effective MCrAlY bond coats prepared by controlled atmosphere heat treatment" . | SURFACE & COATINGS TECHNOLOGY 347 (2018) : 54-65 .
APA Meng, Guo-Hui , Zhang, Bang-Yan , Liu, Hong , Yang, Guan-Jun , Xu, Tong , Li, Cheng-Xin et al. Highly oxidation resistant and cost effective MCrAlY bond coats prepared by controlled atmosphere heat treatment . | SURFACE & COATINGS TECHNOLOGY , 2018 , 347 , 54-65 .
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