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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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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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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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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
WoS CC Cited Count: 8
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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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A novel composite-layered coating enabling self-enhancing thermal barrier performance SCIE
期刊论文 | 2019 , 163 , 142-147 | SCRIPTA MATERIALIA
WoS CC Cited Count: 3
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Abstract :

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
WoS CC Cited Count: 4
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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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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
WoS CC Cited Count: 6
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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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Achieving self-enhanced thermal barrier performance through a novel hybrid-layered coating design SCIE
期刊论文 | 2019 , 167 | MATERIALS & DESIGN
WoS CC Cited Count: 7
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Abstract :

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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Plasma Spraying of Dense Ceramic Coating with Fully Bonded Lamellae Through Materials Design Based on the Critical Bonding Temperature Concept SCIE
期刊论文 | 2019 , 28 (1-2) , 53-62 | JOURNAL OF THERMAL SPRAY TECHNOLOGY
WoS CC Cited Count: 1
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Abstract :

It is usually difficult to deposit a dense ceramic coating with fully bonded splats by plasma spraying at a room temperature. Following the recent research progress on the splat interface bonding formation, it was found that there is a well-defined relationship between the critical bonding temperature and the melting point of spray material. Thus, it can be proposed to control the lamellar bonding through the deposition temperature. In this study, to examine the feasibility of the bonding formation theory, a novel approach to the development of ceramic coating with dense microstructure by plasma spraying through materials design with a low melting point is proposed. Potassium titanate K2Ti6O13 was selected as a typical ceramic material of a relatively low melting point for plasma spraying deposition of dense coating with well-bonded splats. Experiment was conducted by using K2Ti6O13 for both splat and coating deposition. Results show that the splat is fully bonded with a ceramic substrate at room temperature, and the K2Ti6O13 coating presents a dense microstructure and a fracture surface morphology similar to sintered bulk ceramic, revealing excellent interlamellar bonding formation. Moreover, both the hardness test and erosion test at 90 degrees further confirmed the formation of the isotropic ceramic coating with fully bonded lamellae.

Keyword :

plasma spraying erosion behavior lamellae bonding K2Ti6O13 dense ceramic coatings

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GB/T 7714 Li, Chang-Jiu , Zhang, Qi-Lan , Yao, Shu-Wei et al. Plasma Spraying of Dense Ceramic Coating with Fully Bonded Lamellae Through Materials Design Based on the Critical Bonding Temperature Concept [J]. | JOURNAL OF THERMAL SPRAY TECHNOLOGY , 2019 , 28 (1-2) : 53-62 .
MLA Li, Chang-Jiu et al. "Plasma Spraying of Dense Ceramic Coating with Fully Bonded Lamellae Through Materials Design Based on the Critical Bonding Temperature Concept" . | JOURNAL OF THERMAL SPRAY TECHNOLOGY 28 . 1-2 (2019) : 53-62 .
APA Li, Chang-Jiu , Zhang, Qi-Lan , Yao, Shu-Wei , Yang, Guan-Jun , Li, Cheng-Xin . Plasma Spraying of Dense Ceramic Coating with Fully Bonded Lamellae Through Materials Design Based on the Critical Bonding Temperature Concept . | JOURNAL OF THERMAL SPRAY TECHNOLOGY , 2019 , 28 (1-2) , 53-62 .
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Microstructure and Transparent Super-Hydrophobic Performance of Vacuum Cold-Sprayed Al2O3 and SiO2 Aerogel Composite Coating EI SCIE Scopus
期刊论文 | 2018 , 27 (3) , 471-482 | JOURNAL OF THERMAL SPRAY TECHNOLOGY
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In this study, vacuum cold spraying was used as a simple and fast way to prepare transparent super-hydrophobic coatings. Submicrometer-sized Al2O3 powder modified by 1,1,2,2-tetrahydroperfluorodecyltriethoxysilane and mixed with hydrophobic SiO2 aerogel was employed for the coating deposition. The deposition mechanisms of pure Al2O3 powder and Al2O3-SiO2 mixed powder were examined, and the effects of powder structure on the hydrophobicity and light transmittance of the coatings were evaluated. The results showed that appropriate contents of SiO2 aerogel in the mixed powder could provide sufficient cushioning to the deposition of submicrometer Al2O3 powder during spraying. The prepared composite coating surface showed rough structures with a large number of submicrometer convex deposited particles, characterized by being super-hydrophobic. Also, the transmittance of the obtained coating was higher than 80% in the range of visible light.

Keyword :

alumina silica aerogel super-hydrophobicity transparency vacuum cold spray

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GB/T 7714 Li, Jie , Zhang, Yu , Ma, Kai et al. Microstructure and Transparent Super-Hydrophobic Performance of Vacuum Cold-Sprayed Al2O3 and SiO2 Aerogel Composite Coating [J]. | JOURNAL OF THERMAL SPRAY TECHNOLOGY , 2018 , 27 (3) : 471-482 .
MLA Li, Jie et al. "Microstructure and Transparent Super-Hydrophobic Performance of Vacuum Cold-Sprayed Al2O3 and SiO2 Aerogel Composite Coating" . | JOURNAL OF THERMAL SPRAY TECHNOLOGY 27 . 3 (2018) : 471-482 .
APA Li, Jie , Zhang, Yu , Ma, Kai , Pan, Xi-De , Li, Cheng-Xin , Yang, Guan-Jun et al. Microstructure and Transparent Super-Hydrophobic Performance of Vacuum Cold-Sprayed Al2O3 and SiO2 Aerogel Composite Coating . | JOURNAL OF THERMAL SPRAY TECHNOLOGY , 2018 , 27 (3) , 471-482 .
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Wettability transition on micro-nano hierarchical structured Ni20Cr coating surface by selective spontaneous adsorption during vacuum evacuation EI SCIE Scopus
期刊论文 | 2018 , 219 , 292-302 | Materials Chemistry and Physics
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A coating surface of metallic Ni20Cr with a bionic hierarchical micro-nano scaled structure was fabricated by shrouded plasma spraying technology. A novel phenomenon was found on the coating surface that the surface wettability can change from original super-hydrophilicity to super-hydrophobicity with a contact angle of 152° and sliding angle of 2° by evacuation in oil-free vacuum systems. To clarify the wettability transition mechanism in vacuum conditions, the microstructure and chemical composition of the coating surface were systematically investigated. The results revealed that the main reason for the wettability transition was due to the formation of chemisorbed carboxylates and physisorbed saturated hydrocarbons on the coating surface by selective spontaneous adsorption of the residual gas molecules from vacuum environment. The hydrophobic saturated hydrocarbon chains oriented outward the surface effectively reduced the surface energy and cause a spontaneous wettability transition. The evacuation process under the vacuum conditions enhanced the adsorption rate on the coating surface. The degree of wettability transition depended on the amount of the surface adsorbates. © 2018 Elsevier B.V.

Keyword :

Chemical compositions Micro-nano structures Plasma spraying technology Saturated hydrocarbons Spontaneous adsorption Super hydrophilicity Superhydrophobicity Transition mechanism

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GB/T 7714 Li, Jie , Li, Chengxin , Yang, Guanjun et al. Wettability transition on micro-nano hierarchical structured Ni20Cr coating surface by selective spontaneous adsorption during vacuum evacuation [J]. | Materials Chemistry and Physics , 2018 , 219 : 292-302 .
MLA Li, Jie et al. "Wettability transition on micro-nano hierarchical structured Ni20Cr coating surface by selective spontaneous adsorption during vacuum evacuation" . | Materials Chemistry and Physics 219 (2018) : 292-302 .
APA Li, Jie , Li, Chengxin , Yang, Guanjun , Li, Changjiu . Wettability transition on micro-nano hierarchical structured Ni20Cr coating surface by selective spontaneous adsorption during vacuum evacuation . | Materials Chemistry and Physics , 2018 , 219 , 292-302 .
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