scholarly journals Process Simulation and Abrasion Behavior of Jet Electrodeposited Ni–TiN Nanocoatings

Coatings ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 86
Author(s):  
Zhongguo Yang ◽  
Shujuan Yi ◽  
Longkui Cao ◽  
Songhao Tang ◽  
Qiang Li
Keyword(s):  
Process Simulation ◽  
Abrasion Resistance ◽  
High Performance ◽  
Nozzle Diameter ◽  
Micro Hardness ◽  
Compact Layer ◽  
Jet Electrodeposition ◽  
Steel Substrates

In this work, we study jet-electrodeposited Ni–TiN composite nanocoatings (CNCs) for improving abrasion resistance as a function of various nozzle diameters. In addition, COMSOL software is utilized to simulate the process of jet electrodeposition, particularly the influence of spraying speed and pressure of the electrolyte on the abrasion resistance of coatings. Optimization of the nozzle diameter to obtain uniform and high-performance coatings showed that a Φ7 mm nozzle diameter generated the optimum spraying speed and spraying pressure, which results in good micro-hardness and abrasion resistance of the Ni–TiN CNCs. Under these conditions, the 45 steel substrates are coated with a compact layer of uniform and nano-sized TiN particles, which are responsible for the high abrasion resistance of our Ni–TiN CNCs. Our study may motivate researchers to study jet electrodeposition in order to obtain abrasion-resistant coatings.

scholarly journals Investigation of Microstructure, Phases and Micro-Hardness of Molybdenum Coatings Deposited by Flame Wire Spray on Stee

2020 ◽  
pp. 495-501
Author(s):  
Mokhtar Djendel ◽  
Omar Allaoui ◽  
Rabah Boubaaya ◽  
Samir Benaniba ◽  
Mourad Maazouz
Keyword(s):  
Mechanical Properties ◽  
Thermal Spray ◽  
High Performance ◽  
Industrial Applications ◽  
Flame Spray ◽  
Micro Hardness ◽  
X Ray Diffraction ◽  
Wear Resistant Coatings ◽  
Arc Spray ◽  
Steel Substrates

Coating deposition on many industrial components with good microstructural, mechanical properties and better wear resistance is always a challenge for the thermal spray community. A number of thermal spray methods are used to develop such promising coatings for many industrial applications; viz. arc spray, flame spray, plasma, and HVOF. All these processes have their own limitations to achieve porous free, very dense, high performance wear resistant coatings. In this study, an attempt has been made to overcome this limitation. Molybdenum coatings were deposited on steel substrates using Wire flame. As-sprayed coatings were analyzed for phase using x-ray diffraction (XRD), and for microstructural using scanning electron microscopy (SEM), also the micro-hardness of coatings are measured. Results show that the coatings have good performance in terms of microstructural, mechanical properties

scholarly journals Abrasion Resistance of Ultra-High-Performance Concrete for Railway Sleepers

2021 ◽  
Author(s):  
Ariful Hasnat ◽  
Nader Ghafoori
Keyword(s):  
Prestressed Concrete ◽  
Abrasion Resistance ◽  
High Performance ◽  
High Performance Concrete ◽  
High Strength ◽  
Positive Influence ◽  
Cementitious Material ◽  
Partial Replacement ◽  
Fine Aggregate ◽  
Ultra High Performance Concrete

AbstractThis study aimed to determine the abrasion resistance of ultra-high-performance concretes (UHPCs) for railway sleepers. Test samples were made with different cementitious material combinations and varying steel fiber contents and shapes, using conventional fine aggregate. A total of 25 UHPCs and two high-strength concretes (HSCs) were selected to evaluate their depth of wear and bulk properties. The results of the coefficient of variation (CV), relative gain in abrasion, and abrasion index of the studied UHPCs were also obtained and discussed. Furthermore, a comparison was made on the resistance to wear of the selected UHPCs with those of the HSCs typically used for prestressed concrete sleepers. The outcomes of this study revealed that UHPCs displayed excellent resistance against abrasion, well above that of HSCs. Amongst the utilized cementitious material combinations, UHPCs made with silica fume as a partial replacement of cement performed best against abrasion, whereas mixtures containing fly ash showed the highest depth of wear. The addition of steel fibers had a more positive influence on the abrasion resistance than it did on compressive strength of the studied UHPCs.

High-performance polysilicon thin film transistors on steel substrates

2000 ◽  
Vol 266-269 ◽  
pp. 1284-1288
Author(s):  
Ming Wu ◽  
Yu Chen ◽  
Kiran Pangal ◽  
James C. Sturm ◽  
Sigurd Wagner
Keyword(s):  
Thin Film ◽  
Thin Film Transistors ◽  
High Performance ◽  
Steel Substrates

Successive surface engineering of TiO2 compact layers via dual modification of fullerene derivatives affording hysteresis-suppressed high-performance perovskite solar cells

2017 ◽  
Vol 5 (4) ◽  
pp. 1724-1733 ◽  
Author(s):  
Weiran Zhou ◽  
Jieming Zhen ◽  
Qing Liu ◽  
Zhimin Fang ◽  
Dan Li ◽  
...  
Keyword(s):  
Solar Cells ◽  
High Performance ◽  
Surface Engineering ◽  
Perovskite Solar Cells ◽  
Engineering Method ◽  
Voltage Response ◽  
Efficiency Enhancement ◽  
Compact Layer ◽  
Fullerene Derivatives ◽  
Current Voltage

A new successive surface engineering method via a dual modification of TiO2 compact layer by PC61BM and C60-ETA was developed, affording dramatic efficiency enhancement with suppressed-hysteresis current–voltage response.

Preparation of Porous Metallic Nickel by Jet Electrodeposition

2011 ◽  
Author(s):  
Li-da Shen ◽  
Zong-jun Tian ◽  
Zhi-dong Liu ◽  
Yin-hui Huang
Keyword(s):  
Porous Structure ◽  
Energy Absorption ◽  
Current Density ◽  
Absorption Rate ◽  
Porous Metal ◽  
Metallic Nickel ◽  
Micro Hardness ◽  
Porous Nickel ◽  
Dendritic Crystal ◽  
Jet Electrodeposition

The theory and related technology of porous metallic nickel by using jet electrodeposition (JED) are reviewed, and preparation of different porosities of the porous metallic nickel samples was made by the self-developed device. The surface morphology, microstructure, grain size of the micro-cell structure of deposition were studied and analyzed by SEM, and the mechanical properties of the sample, such as surface micro hardness and compressive property were also studied. The results are as follows: the process of porous nickel preparation by jet electrodeposition mentioned in paper is capable of preparing porous metal with dendritic crystal structure as the subject porous structure. Ejection electrodeposition has great advantages in machining efficiency and cost compared with porous metal preparation process of traditional electrodeposition. The porous nickel metal sample prepared, in respects of pore distribution and porosity, are affected by electrodeposited porous dendritic crystal layers. The formula Bath A, which has a relatively low concentration of nickel ions, can make the preparation of porous dendrite structure more favorable in the way that it has more uniform compactness. Current density is the key indicator in forming ideal branched crystal; more than 60A/dm2 can make the process access to a good working state. With the increase in current density, the dendrite formation of porous structure becomes more compact. The porosity of the prepared sample is 48.7%, using jet scanning electrodeposition with the current density at 80A/dm2. The surface micro hardness of the sample reaches HV 315. The compressive yield stress of porous Nickel is 11.35 MPa, which has a large number of plastic deformations of the absorption capacity. From original data of sample energy absorption rate and fitting curve, it is known that there comes great plastic deformation, which gives the sample better absorption ability and relatively greater energy absorption rate at a relatively low flow stress.

Achieving high-performance planar perovskite solar cell with Nb-doped TiO2 compact layer by enhanced electron injection and efficient charge extraction

2016 ◽  
Vol 4 (15) ◽  
pp. 5647-5653 ◽  
Author(s):  
Bai-Xue Chen ◽  
Hua-Shang Rao ◽  
Wen-Guang Li ◽  
Yang-Fan Xu ◽  
Hong-Yan Chen ◽  
...  
Keyword(s):  
Solar Cell ◽  
Power Output ◽  
High Performance ◽  
Electron Injection ◽  
Perovskite Solar Cell ◽  
Maximum Power ◽  
Compact Layer ◽  
Doped Tio2 ◽  
Maximum Power Output ◽  
Efficient Charge

A PSC based on 2% Nb-doped TiO2 achieved a PCE of up to 16.3%, which is consistent with a stabilized maximum power output of 15.8%.

Study on the Performance and Application of High Performance Pavement Portland Cement Concrete

2013 ◽  
Vol 639-640 ◽  
pp. 411-416 ◽  
Author(s):  
Ai Ping Liu ◽  
Jian Yin ◽  
Wei Min Song
Keyword(s):  
Portland Cement ◽  
Abrasion Resistance ◽  
High Performance ◽  
Heavy Traffic ◽  
Environmental Benefits ◽  
Portland Cement Concrete ◽  
Cement Concrete ◽  
Compressive Performance ◽  
Practical Engineering ◽  
Pavement Concrete

Because of some drawbacks including low strength, poor dimensional stability, low abrasion resistance, easy to crack and other shortcomings, Portland cement concrete was limited to use as a dominant pavement material in highway construction. This paper studied the feasibility of making high performance pavement concrete by adding 20-40% of high-quality composite ultra-fine fly ash (CUFA) technology to achieve high-performance of concrete roads have been studied. The test results indicated that: with cementitious material content of 360~400 kg/m3 and CUFA content of 20% ~ 40%, adding CUFA improved the workability of concrete significantly; in the meantime, the 28d compressive strength was as high as 50 MPa, and the later strength of concrete continued growing. The designed concrete satisfied the requirements of opening to traffic after 3 days after the construction and heavy and extra heavy traffic in 28 days. The durability, especially the abrasion resistance, and the crack-resistance were improved significantly. The designed pavement concrete not only had a good compressive performance for practical engineering but also had good technical, economic, social and environmental benefits.

pvT-Behavior of Polymers under Processing Conditions and Implementation in the Process Simulation

2015 ◽  
Vol 825-826 ◽  
pp. 677-684 ◽  
Author(s):  
Rotraud Freytag ◽  
José Antonio Pérez Gil ◽  
Reinhard Forstner
Keyword(s):  
Process Simulation ◽  
Specific Volume ◽  
High Performance ◽  
Process Conditions ◽  
Crystalline Polymers ◽  
Pvt Data ◽  
Process Simulations ◽  
Pvt Measurements ◽  
Pvt Behavior ◽  
Couette Rheometer

The development of high performance products at lowest possible product development-time and costs is the demand of the plastics industry today. A successful use of process simulation to describe the behavior of complex structures and to minimize the technical and economic risks for companies requires application and process-relevant material data.The pvT-behavior of polymers is an essential parameter for process simulations. Especially the dependence of the specific volume of pressure and temperature [1, 2] under process conditions is not mapped to the existing measurement methods.In this study pvT measurements were performed on selected amorphous and semi-crystalline polymers (PP, HDPE, POM, PBT, and ABS) with a Pirouette pvT device, a combination of a dilatometer and Couette rheometer. The specific volume was determined as a function of temperature (25-300°C) and at pressures ranging between 200-1000 bar. On top of that, the influence of the cooling rate was also investigated by pvT measurements performed at cooling rates of 0.1°C/s, 1°C/s and 100°C/s.The coefficients for the 2nd domain Tait pvT-model, which is implemented in the software Autodesk Moldflow, were determined by fitting the experimental pvT data and comparing them with the measured curves. As a result, the semi-crystalline polymers show a shift of the transition temperature to lower temperatures and a reduction in the specific volume in the melt is observed. For validation, in a case study shrinkage results in real were compared with the simulation.

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