Littérature scientifique sur le sujet « ZINC COATED C.I. PLATE »
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Articles de revues sur le sujet "ZINC COATED C.I. PLATE"
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Ahmad, Muhammad Shakeel, Shwe Sin Han, Amad Zafar, Usman Ghafoor, Nasrudin Abd Rahim, Muhammad Umair Ali et You Seung Rim. « Indoor and Outdoor Performance Study of Metallic Zinc Particles in Black Paint to Improve Solar Absorption for Solar Still Application ». Coatings 11, no 5 (30 avril 2021) : 536. http://dx.doi.org/10.3390/coatings11050536.
Texte intégralRésumé :
In this study, the effects of metallic zinc (Zn) particles were studied to increase surface temperature on a solar-still absorber, which is a major component of increased production. Various concentrations of Zn particles were mixed in black paint and applied to the absorber plate. SEM and XRD were used to examine and confirm the surface morphology and phase identification of as-received powder. UV-Vis spectroscopy was used to examine light-absorption properties. Finally, extensive indoor testing (using an improvised solar emulator) and outdoor testing were conducted to optimize the concentration. The specimens containing 10 wt% Zn in black paint showed the highest increase in temperature, i.e., 103.53 °C in indoor conditions at 1000 W/m2 irradiation, which is 59.17% higher than a bare aluminum plate and 17.57% higher than an only black-paint-coated aluminum plate. On the other hand, specimens containing 10 wt% Zn reached just 87.53 °C, compared to 80.00 °C for an only black-paint-coated aluminum plate and 60.62 °C for bare aluminum.
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Lü, Xue Ming, Xiao Ping Zou, Jin Cheng, Gang Qiang Yang, Cui Liu Wei, Zhe Sun, Hong Ying Feng, Yuan Yang, Gong Qing Teng et Xiang Min Meng. « Influence of Potassium Chloride on the Electrochemical Deposition of ZnO Plate Films ». Advanced Materials Research 123-125 (août 2010) : 703–6. http://dx.doi.org/10.4028/www.scientific.net/amr.123-125.703.
Texte intégralRésumé :
KCl is usually used as the supporting electrolyte in electrochemical deposition of Zinc oxide materials. Besides the role of supporting electrolyte, it can also influence the morphology of the fabricated materials. In this work, ZnO and zinc hydroxide chloride hydrate (Zn5(OH)8Cl2•H2O) mixture with platelet-like morphology were electrochemically deposited directly on ITO-coated glass substrates at 65°C. The electrolyte was 0.1M Zn(NO3)2•6H2O with KCl concentration varied from 0 to 3.2M. It was found that only ZnO thin film was obtained when the concentration of KCl was below 0.02M. Plates structure appeared as the concentration of KCl increased to 0.04M. Plentiful plates were obtained when the concentration of KCl was 0.05M-0.2M. From the X-ray diffraction, it was confirmed that the plate films was the mixture of ZnO and Zn5(OH)8Cl2•H2O. The plates showed perfect single crystal structure confirmed by selected area electron diffraction. Zn and Zn5(OH)8Cl2•H2O were obtained when the concentration of KCl was above 0.8M.
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Wu, Guang Ming, Yao Ding, De Wen Gao, Guang Jian Xing, Yang Zhou et Tian Lan Yin. « Electrochemical Deposition and Properties Research of ZnO Thin Films ». Advanced Materials Research 669 (mars 2013) : 72–78. http://dx.doi.org/10.4028/www.scientific.net/amr.669.72.
Texte intégralRésumé :
The transparent ZnO films were deposited on the indium tin oxide (ITO) coated glass substrates by using the square wave potential deposition method. The conductive graphite plate is used for counter electrode, electrolyte consist of zinc nitrate and additive of electrochemistry, which is made up CTAB and potassium nitrate. Crystallinities of the films were examined by X-ray diffractometer. The morphologies of zinc oxide films were observed with atomic force microscope. Optical characteristics of zinc oxide layers were measured with UV–vis spectrophotometer. The optimal conditions for preparation of zinc oxide thin films with the square wave potential method were as follows: the deposition time was 6 min, concentration of zinc nitrate was 0.05mol/L, deposition temperature was 80 °C, and the annealing temperature was 500 º C. The average optical transmittance of the ZnO films is higher than 85% in the visible range. Moreover, the films have flat surface and small grain size.
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Yasoda, Ratna Divya, Nour Hakim, Ying Huang et Xiaoning Qi. « Post-Fire Analysis of Thermally Sprayed Coatings : Evaluating Microstructure, Mechanical Integrity, and Corrosion Behavior ». Processes 11, no 5 (15 mai 2023) : 1490. http://dx.doi.org/10.3390/pr11051490.
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This paper examines the impact of fire on the microstructural, mechanical, and corrosion behavior of wire-arc-sprayed zinc, aluminum, and Zn-Al pseudo-alloy coatings. Steel plates coated with these materials were subjected to temperatures in increments of 100 °C, starting from 300 °C and progressing until failure. Microstructural characterization, microhardness, abrasion resistance, and electrochemical impedance studies were performed on the post-fire coatings. The findings from this study show that heat had a positive impact on the performance of zinc and Zn-Al pseudo-alloy coatings when they were exposed to temperatures of up to 400 °C, while aluminum coatings maintain their performance up to 600 °C. However, above these temperatures, the effectiveness of coatings was observed to decline, due to increased high-temperature oxidation, and porosity, in addition to decreased microhardness, abrasion resistance, and corrosion protection performance. Based on the findings from this study, appropriately sealed thermal-spray-coated steel components can be reused after exposure to fire up to a specific temperature depending on the coating material.
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Leng, Yan Hong, Yun Li Feng et Meng Song. « Study on Hot Dip and Coating Structure of 55% Al-Zn Alloy Coated Steel ». Advanced Materials Research 415-417 (décembre 2011) : 276–80. http://dx.doi.org/10.4028/www.scientific.net/amr.415-417.276.
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Hot dip galvanizing treatments of Galvalume were studied by using methods of Gleeble thermal simulation experiment and optical microscopy(OM), scanning electronic microscopy (SEM), X-ray energy dispersive analysis(EDAX), X-ray diffraction(XRD) and so on. Meanwhile, surface morphology, microstructure, phases and the respective compositions of Al-Zn alloy coating plate were investigated, the formation of hot dipped 55％Al-Zn alloy coating were analyzed. The results show that to get better coated surface, in-zinc pot temperature should be controlled in the range of 590~610°C, and height of air-knife nozzle should be kept in the range of 150~200mm. Surface layer of 55％Al-Zn alloy coating is covered by Al-Zn alloy, the intermediate alloy layer is consisted of binary and ternary compounds, such as θ phase (FeAl3), Al0.3Fe3Si0.7and Al3.21Si0.47.
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Song, Meng, Yun Li Feng et Jing Bo Yang. « Study on Manufacturing Process and Applying of Galvalume ». Materials Science Forum 704-705 (décembre 2011) : 1406–9. http://dx.doi.org/10.4028/www.scientific.net/msf.704-705.1406.
Texte intégralRésumé :
Annealing and dip galvanizing treatments of Galvalume were studied by using methods of Gleeble thermal simulation experiment and optical microscopy (OM), scanning electronic microscopy (SEM), X-ray energy dispersive analysis (EDAX), X-ray diffraction (XRD) and so on. Meanwhile, surface morphology, microstructure, phases and the respective compositions of Al-Zn alloy coating plate were analyzed. The results show that decreased rate and prolonged time of annealing treatment cause less effect on process ability of product, which all because of the short time of annealing process in continuous aluminum-zinc treatment. However, coarse grain which causes low strength, high elongation and r value occurs when rising annealing temperature. To get better coated surface, in-zinc pot temperature should be controlled in the range of 590~610°C, and height of air-knife nozzle should be kept in the range of 150~200mm. Surface layer of 55％Al-Zn alloy coating is covered by Al-Zn alloy, the intermediate alloy layer is consisted of binary and ternary compounds, such as θ phase (FeAl3), Al0.3Fe3Si0.7 and Al3.21Si0.47. Keywords: Galvalume, Process, Microstructure, Properties
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Guo, Changjian. « Application of ZnO Semiconductor Nanomaterial Ink in Packaging and Printing Design ». Journal of Chemistry 2022 (20 septembre 2022) : 1–7. http://dx.doi.org/10.1155/2022/6166533.
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In order to obtain a flat and clear packaging printing pattern, the author proposes a printing method based on ZnO semiconductor nanomaterial ink. The method uses zinc acetate dihydrate as raw material, ethylenediamine as a complexing agent, absolute ethanol as a solvent, and ethyl cellulose as an auxiliary agent to prepare particle-free ZnO functional ink. The ink was spin-coated on a glass substrate, cured at different temperatures on a heating plate for 30 min, and passed through an X-ray diffractometer, a field emission scanning electron microscope, an infrared spectrometer, a synchronous thermal analyzer, an ultraviolet-visible spectrophotometer, and a transmission electron microscopy were used to characterize the synthesized inks and the resulting films. Experiments show that the decomposition temperature of particle-free ZnO conductive ink is much lower than that of zinc acetate precursor; the film cured at 300°C for 30 min has a smooth surface, uniform particle size, good crystallinity, and transmittance of up to 80%. After inkjet printing on the PI flexible substrate, after curing at 300°C for 30 min, the pattern surface is smooth and clear, and the outline is clear. Conclusion. The printing method is based on ZnO semiconductor nanomaterial ink. It has good application prospects in packaging and printing design.
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Yu, Liang, Qingfeng Yi, Xiaokun Yang et Xiulin Zhou. « One-Step Construction of Ni/Co-Doped C–N Nanotube Composites as Excellent Cathode Catalysts for Neutral Zinc–Air Battery ». Nano 14, no 03 (mars 2019) : 1950028. http://dx.doi.org/10.1142/s1793292019500280.
Texte intégralRésumé :
Development of a neutral Zn–air battery is of much significance due to the high stability of zinc in a neutral electrolyte. Here, Ni/Co-doped C–N nanotube composites (C–N, Ni/C–N, Co/C–N, and Ni–Co/C–N) as efficient oxygen reduction reaction (ORR) electrocatalysts in a neutral medium have been prepared by direct pyrolysis of Ni/Co salt, dicyandiamide (DCD) and glucose. Among the synthesized catalysts, Ni–Co/C–N presents a high ORR current density of 8.5[Formula: see text]mA[Formula: see text][Formula: see text][Formula: see text]cm[Formula: see text] in a 0.5[Formula: see text]mol[Formula: see text][Formula: see text][Formula: see text]L[Formula: see text] KNO3 solution. The ORR electron transfer number of the catalyst Ni–Co/C–N is 3.8, indicating that O2 is almost completely reduced to H2O. A neutral zinc–air battery utilizing a 0.5[Formula: see text]mol[Formula: see text][Formula: see text][Formula: see text]L[Formula: see text] KNO3 solution has been assembled by using the prepared composite catalyst coated on carbon paper as an air cathode, and Zn plate as an anode. The battery with the cathode catalyst Ni–Co/C–N delivers the open-circuit voltage of 1.13[Formula: see text]V and the maximum power density of 65[Formula: see text]mW[Formula: see text][Formula: see text][Formula: see text]cm[Formula: see text]. The constant discharge current density of 50[Formula: see text]mA[Formula: see text][Formula: see text][Formula: see text]cm[Formula: see text], 100[Formula: see text]mA[Formula: see text][Formula: see text][Formula: see text]cm[Formula: see text] and 150[Formula: see text]mA[Formula: see text][Formula: see text][Formula: see text]cm[Formula: see text] can last 202[Formula: see text]h, 93[Formula: see text]h and 11[Formula: see text]h, respectively. A stable voltage plateau appears at various discharge current densities. The neutral zinc–air battery can be repeatedly discharged after replacing the zinc anode. Results indicate that the synthesized Ni–Co/C–N catalyst is an excellent cathode material applied to a neutral zinc–air battery, showing broad application prospects as a mobile power source.
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Selvi, M. Senthamizh, N. Sankara Subramanian et S. Rajathi. « Effect of Spinrate on the Structural, Optical and Surface Properties of the Sol-Gel Spin Coated Zinc Oxide Thin Films ». Advanced Materials Research 699 (mai 2013) : 403–8. http://dx.doi.org/10.4028/www.scientific.net/amr.699.403.
Texte intégralRésumé :
Zinc Oxide thin films have been deposited on glass substrates at different spin rate by sol-gel spin coating method. XRD measurement of the ZnO films confirms the Wurtzite hexagonal phase with the preferred orientation along the C-axis (002) plane. The other characteristic orientations (100) and (101) have also been observed. The average crystallite size evaluated from the XRD data lies between 5 nm and 20 nm. The crystallographic parameters viz., lattice constants, mean crystalline size, dislocation density, texture coefficient and standard deviation have been calculated from the XRD data. The estimated texture coefficient indicates the oriented overgrowth of (002) plane for the ZnO films spin coated up to the spin rate 3500 rpm. ZnO thinfilm spin coated at 4000 rpm and 3500 rpm shows maximum transmittance of 87.5% and 88.5 % respectively at 850 nm. The measured direct band gap energy of the ZnO films coated at different spin rates varies between 3 eV and 3.3 eV. The grain size observed from the microstructure of AFM is around 50 nm and this indicates the aggregation of nanosize cryatallites. The effect of spin rate on the structural, optical and surface properties of the spin coated ZnO thinfilms have been investigated and reported.
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Tsoy, Alexandr, Alexandr Granovskiy, Dmitriy Koretskiy, Diana Tsoy-Davis, Nikita Veselskiy, Mikhail Alechshenko, Alexandr Minayev, Inara Kim et Rita Jamasheva. « Experimental Study of the Heat Flow and Energy Consumption during Liquid Cooling Due to Radiative Heat Transfer in Winter ». Energies 16, no 13 (22 juin 2023) : 4865. http://dx.doi.org/10.3390/en16134865.
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Radiation cooling is a passive energy saving cooling technology. The process of cooling heat transfer liquid due to the combined effect of night radiative cooling and convection of air at negative temperatures (in winter) is studied. The radiator used for cooling was built into the roof of the building. Its radiating plate was made of a steel sheet coated with zinc oxide. In it, heat dissipation was carried out both from the upper and lower sides of the radiating plate. The experimental values of the heat flux ranged from 20 to 80 W·m−2 at a temperature difference between heat transfer liquid and air from 5 to 15 °C and ambient air temperature from −17 to +5 °C. The correctness of the model for calculating the heat flux in winter conditions was confirmed. A theoretical calculation showed that, in winter, the heat flux removed by the radiator will be 15% less than the heat flux in summer. The amount of heat transferred per watt of electrical power of the refrigeration unit reached 8 W·W−1. To keep the refrigeration unit with radiative heat transfer more efficient than in a conventional vapor compression chiller, the heat transfer liquid temperature should be 6 °C above the atmospheric temperature air. The results of the study show that radiative cooling can be used in winter and may be useful for the development of energy-efficient cooling systems for various purposes (air conditioning, industrial cooling systems and fruit storage chambers).
Thèses sur le sujet "ZINC COATED C.I. PLATE"
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MANN, PULKIT. « THERMODYNAMIC MODELING AND MATERIAL INVESTIGATION OF ZINC COATED C.I. PLATE FOR MITIGATION OF SENSIBLE HEAT LOSS IN BOILER ». Thesis, 2022. http://dspace.dtu.ac.in:8080/jspui/handle/repository/19356.
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The life of the material and the cost associated with it is an important parameter on which our
day to day engineering structures depend upon. One of the easiest and universally used methods
is that of coating. The coating acts as a sacrificial barrier on substrate material to protect it from
various harsh conditions that the specimen is subjected to. The function of the coating is to
render protection against the degrading effects of the working environment on the specimen.
This paper reviews theoretical and experimental aspects of corrosion and wear resistance of
electroplated zinc on cast iron using material characterization. Also, the effect of high
temperature on electroplated zinc is modeled using ANSYS software. Zinc coating is a
universally used method to protect the material from corrosion because of its low cost and
adhesive nature and has its application in nuts, bolts, metal stamping, automobile industry etc.
Chapitres de livres sur le sujet "ZINC COATED C.I. PLATE"
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Wan, Li, Xiang Pan, Lizhen Huang, Baotao Huang, Cai Yang et Yiming Du. « The Influence of Coating Material and Thickness on the Corrosion Degree of Q345 Steel ». Dans Lecture Notes in Civil Engineering, 75–82. Singapore : Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1748-8_6.
Texte intégralRésumé :
AbstractIn order to investigate the anti-corrosion effect of coated steel of steel bridge, Q345 steel plate specimens with three types of coatings, including zinc coating, aluminum coating and zinc-aluminum coating, are produced by the arc spraying technology. In the present study, chlorine corrosion tests are performed to investigate the influence law of different coating material and its thickness on the corrosion degree. Then the calculation results of two corrosion indicators are compared and analyzed. It is shown that the two corrosion indicators reflect the same corrosion law of three kinds of coating steel. The corrosion of all coated specimens is obviously severe in the early stage and gradually gentle in the later stage. It is also found that during the whole corrosion cycle, the corrosion rate of aluminum coating is smaller and change slower than the other two kinds of coatings, whereas the coating thickness of 200 μm of aluminum coating changes significantly. Therefore, aluminum coating is recommended as a priority, and the recommended coating thickness range of which is 100–150 μm.
Actes de conférences sur le sujet "ZINC COATED C.I. PLATE"
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Ruiz, Maritza, Claire M. Kunkle, Jorge Padilla et Van P. Carey. « Boiling Heat Transfer Performance in a Spiraling Radial Inflow Microchannel Cold Plate ». Dans ASME 2015 13th International Conference on Nanochannels, Microchannels, and Minichannels collocated with the ASME 2015 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/icnmm2015-48406.
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This study presents an experimental exploration of flow boiling heat transfer in a spiraling radial inflow microchannel heat sink. The effect of surface wettability, fluid subcooling levels, and mass fluxes are considered in this type of heat sink for use in applications with high fluxes up to 300 W/cm2. The design of the heat sink provides an inward radial swirl flow between parallel, coaxial disks that form a microchannel of 300 μm and 1 cm radius with a single inlet and a single outlet. The channel is heated on one side through a copper conducting surface, while the opposite side is essentially adiabatic to simulate a heat sink scenario for electronics cooling. Flow boiling heat transfer and pressure drop data were obtained for this heat sink device using water at near atmospheric pressure as the working fluid for inlet subcooling levels from 20 to 81°C and mean mass flux levels ranging from 184 to 716 kg/m2s. To explore the effects of varying surface wetting, experiments were conducted with two different heated surfaces. One was a clean, machined copper surface with water equilibrium contact angles in the range of 14–40°, typical of common metal surfaces. The other was a surface coated with zinc oxide nanostructures that are superhydrophilic with equilibrium contact angles measured below 10°. During boiling, increased wettability resulted in quicker rewetting and smaller bubble departure diameter as indicated by reduced temperature oscillations during boiling and achieving higher maximum heat flux without dryout. Reducing inlet subcooling levels was also found to reduce the magnitude of oscillations in the oscillatory boiling regime. The highest heat transfer coefficients were seen in fully developed boiling with low subcooling levels as a result of heat transfer being dominated by nucleate boiling. The highest heat fluxes achieved were during partial subcooled flow boiling at 300 W/cm2 with an average surface temperature of 134 °C and requiring a pumping power to heat rate ratio of 0.01%. The hydrophilic surface retained wettability after a series of boiling tests. Recommendations for use of this heat sink design in high flux applications is also discussed.
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Kang, Ki Moon, Hyo-Won Kim, Il-Wun Shim et Ho-Young Kwak. « Syntheses of Specialty Nanomaterials at the Multibubble Sonoluminescence Condition ». Dans ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-68320.
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In recent years, a large number of nano-size semiconductors have been investigated for their potential applications in photovoltaic cells, optical sensor devices, and photocatalysts [1, 2, 3]. Nano-size semiconductor particles have many interesting properties due mainly to their size-dependent electronic and optical properties. Appropriately, many speciality of nanomaterials such as CdS and ZnS semiconductor particles, and other metal oxides such as ZnO and lithium-titanate oxide (LTO) have been prepared. However, most of them were prepared with toxic reactants and/or complex multistep reaction processes. Particularly, it is quite difficult to produce LTO nanoparticles, since it typically requires wearisome conditions such as very high temperature over 1000 °C, long producing times, and so on. To overcome such problems, various core/shell type nanocrystals were prepared through different methods such as the hydrothermal synthetic method, microwave, and sonochemistry. Also many coating methods on inorganic oxide nanoparticles were tried for the preparations of various core-shell type nanocrystals. Sonoluminescence (SL) is a light emission phenomenon associated with the catastrophic collapse of a gas bubble oscillating under an ultrasonic field [4]. Light emission of single bubble sonoluminescence (SBSL) is characterized by picosecond flashes of the broad band spectrum extending to the ultraviolet [5, 6]. The bubble wall acceleration has been found to exceed 1011 g at the moment of bubble collapse. Recently observed results of the peak temperature and pressure from the sonoluminescing gas bubble in sulfuric acid solutions [9] were accurately predicted by the hydrodynamic theory for sonoluminescence phenomena [7, 10, 11, 12], which provides a clue for understanding sonochemical reactions inside the bubble and liquid layer adjacent to the bubble wall. Sonochemistry involves an application of sonoluminescence. The intense local heating and high pressure inside the bubbles and liquid adjacent bubble wall from such collapse can give rise to unusual effects in chemical reactions. The estimated temperature and pressure in the liquid zone around the collapsing bubble with equilibrium radius 5 μm, an average radius of bubbles generated in a sonochemical reactor at a driving frequency of 20 kHz with an input power of 179 W, is about 1000 °C and 500 atm, respectively. At the proper condition, a lot of transient bubbles are generated and collapse synchronistically to emit blue light when high power ultrasound is applied to liquid, and it is called multibubble sonoluminescence (MBSL). Figure 1 shows an experimental apparatus for MBSL with a cylindrical quartz cell, into which a 5 mm diameter titanium horn (Misonix XL2020, USA) is inserted [13]. The MBSL facilitates the transient supercritical state [14].in the liquid layer where rapid chemical reactions can take place. In fact, methylene blue (MB), which is one of a number of typical textile dyestuffs, was degraded very fast at the MBSL condition while MB does not degrade under simple ultrasonic irradiation [13]. MBSL has been proven to be a useful technique to make novel materials with unusual properties. In our study, various metal oxides such as ZnO powder [15], used as a primary reinforcing filler for elastomer, homogeneous Li4Ti5O12 nanoparticles [16], used for electrode materials, and core/shell nanoparticles such as CdS coating on TiO2 nanoparticles [17] and ZnS coating on TiO2 nanoparticles [18], which are very likely to be useful for the development of inorganic dye-sensitized solar cells, were synthesized through a one pot reaction under the MBSL condition. Figure 2 shows the XRD pattern of ZnO nanoparticles synthesized from zinc acetate dehydrate (Zn(CH3CO2)2 · 2H2O, 99.999%, Aldrich) in various alcohol solutions with sodium hydroxide (NaOH, 99.99%, Aldrich) at the MBSL condition. The XRD patterns of all powers indicate hexagonal zincite. The XRD pattern for the ZnO nanoparticles synthesized is similar to the ZnO powder produced by a modified sol-gel process and subsequent heat treatment at about 600 °C [19] as shown in Fig.3. The average particle diameter of ZnO powder is about 7 nm. A simple sonochemical method for producing homogeneous LTO nanoparticles, as shown schematically in Fig. 4. First, LiOH and TiO2 nanoparticles were used to prepare LiOH-coated TiO2 nanoparticles as shown in Fig.5. Second, the resulting nanoparticles were thermally treated at 500 °C for 1 hour to prepare LTO nanoparticles. Figure 6 shows a high resolution transmission electron microscope image of LTO nanoparticles having an average grain size of 30–40 nm. All the nanoparticle synthesized are very pure in phase and quite homogeneous in their size and shape. Recently we succeeded in synthesizing a supported nickel catalyst such as Ni/Al2sO3, MgO/Al2O3 and LaAlO3, which turned out to be effective for methane decomposition [20]. Sonochemistry may provide a new way to more rapidly synthesize many specialty nanoparticles with less waste [21]. This clean technology enables the preparation of new materials such as colloids, amorphous particles [22], and various alloys.
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He, F. « Investigation of the influence of workpiece-side parameters on the layer formation of zinc-coated boron-manganese steel ». Dans Sheet Metal 2023. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902417-53.
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Abstract. The hot stamping process has been established as a technology for the production of ultrahigh-strength steel parts for safety-relevant components in lightweight construction for the automotive sector. Thanks to the reduced overall thickness combined with high tensile strength, it is possible to realize lightweight design concepts with improved crash behavior. Boron-manganese steels are usually used for this purpose. Due to initial process temperatures above 800 °C, hot stamping is considered a lubricant-free process. In addition to high friction and wear in the process, surface scaling and the need for tool repairs are the result. In light of these phenomena, hot stamping materials are coated to protect them from corrosion. Until now, aluminum-silicon-based coatings have been primarily used for the direct hot stamping route. While zinc-based coatings have so far mainly found usage in the indirect process route, they are now also become a valid alternative for the direct process route. In previous investigations, a significant influence of workpiece-side parameters on the formation of the coating during the austenitization process was found for aluminum-silicon (AlSi) coatings. In light of this, a similarly significant influence is suspected for zinc-based coatings. The parameters heating rate, furnace temperature and dwell time in the furnace and the effect on the coating formation of zinc-coated 20MnB8 during austenitization will be investigated. The resulting findings will form the basis for further experiments to investigate the influence of the parameters on friction and wear in the industry near strip drawing tests.
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Teimoori, Khashayar, et Ali M. Sadegh. « Transient Heat Conduction and Thermal Coefficient of Ceramic Coated Fabrics ». Dans ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-38882.
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Ceramic coated fabrics have been employed for heat resistant clothing such as fire-fighters gears, fire-proof insulators, and heating and cooling insulators. Thus, transient heat conduction and thermal properties of such fabrics are needed for the design of the clothing. The goal of this study is to measure the transient heat conduction and the coefficient of thermal expansion of ceramic coated fabrics with different woven morphologies. This has been accomplished through an experimental setup consists of a hotplate assembly, applying a uniform temperature, with the accuracy of +/− 1 °C in less than 500 msec, a ceramic coated fabric and an infra-red thermometer assembly. This set up has been validated by using a known material such as aluminum and copper for the coefficient of thermal expansion measurement. The hot plate temperature was varied between 30 to 400°C within 300 seconds. The transient heat conduction and the thermal coefficient of the woven ceramic coated fabrics were compared with ceramic nonwoven fabrics materials. Finally, upon comparing different samples and measuring the coefficients of thermal expansion, K’s, the level of delay in heat transfer with respect to time has been determined.
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Hung, Yue, et Hazem Tawfik. « Testing and Evaluation of Aluminum Coated Bipolar Plates of PEM Fuel Cells Operating at 70° C ». Dans ASME 2005 3rd International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2005. http://dx.doi.org/10.1115/fuelcell2005-74018.
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Corrosion resistant metal treated bipolar plates with higher rigidity and electrical conductivity than graphite were developed and tested for PEM fuel cell applications. Six replicas of single cells were fabricated; two of graphite composites bipolar plates and the other four plates were coated aluminum. Two different high corrosion resistant coatings were used in this study and were applied to each pair of the metallic plates. An E-TEK Series 14-W MEA with carbon cloth GDL, thickness of Nafion <50 microns, <1mg/cm^2 total platinum content (anode & cathode) and 6.45 cm2 active electrode areas, was fitted to each cell and operated under identical conditions. The obtained data from the two graphite cells were averaged and plotted and the other aluminum cells’ data were similarly treated and plotted on the same graph for comparison. Generally, the metallic treated bipolar plate provided at least a 22% savings in hydrogen consumption in comparison to graphite. This is attributed to the lower bulk and surface contact resistance of the coated aluminum plates used in this study in relation to graphite. The results of the lifetime testing conducted at temperature of 70° C under loading condition ranging from 0 to 0.6 W that showed no indication of power degradation due to metal corrosion for at least 60 hours.
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Jones, M. R., et D. A. Gabriel. « INFLUENCE OF THE SUBENDOTHELLAL BASEMENT MEMBRANE (BM) COMPONENTS ON FLBRLN ASSEMBLY : EVLDENCE FOR A FLBRLNOGEN BLNDLNG SLTE ON TYPE IV COLLAGEN ». Dans XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1642936.
Texte intégralRésumé :
Effective repair of vascular injury requires assembly of a secure fibrin patch at the injury site. A secure fibrin patch must be anchored to the injury site, else it becomes an embolus. Using enzyme linked immunoassay (ELISA), we have evaluated the binding of fibrinogen (F) to single as well as combinations of the subendothelial BM components including laminin (L), type IV collagen (C), and dermatan sulfate (D). Tests were performed using plates coated over night at either 4°C or 37°C for one hour with individual BM or combinations or BM components. Results indicate that F strongly binds to both D and type IV collagen. Binding of F to L was approximately 50% compared to C or D. Combinations of C, L and D were studied with mole ratios of L and D normalized to C. Thus, when the mole ratio of L was increased from 0.1 to 10 relative to C, the amount of F bound to the plate coated with C and L decreased by 30%. When both D and L were added to C and the binding of F to the coated plate evaluated, increasing the mole ratio of D from 1 to 10 relative to C and L (C:D:L=1:1:0-10), increased the binding of F two fold. If the mole ratio of L was increased by a factor of 10 compare to C, and D varied form 0 to a 10 mole excess compared to C, (C:L:D=1:10:0-10) the increase in F binding was only increased by 1/3. Therefore, L decreases the binding of F by C, while D strongly increases the binding of F. These data suggest that an important interaction between the endothelial basement membrane and fibrin exists and the mole ratio between CLD is critical in determining the extent of the interaction. The interaction between F and C,L,D may underlie the mechanism by which a fibrin clot is anchored and stabilized to the injury site.
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Zhang, Yanhang, Martin L. Dunn, Jeffrey W. Elam et Steven M. George. « Suppression of Stress Relaxation in MEMS Multilayer Film Microstructures by Use of ALD Nanocoatings ». Dans ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-39298.
Texte intégralRésumé :
We study the suppression of stress relaxation in MEMS multilayer film microstructures by the use of alumina nanocoatings realized by atomic layer deposition (ALD). Gold (0.5 μm thick) / polysilicon (1.5 or 3.5 μm thick) beam and plate microstructures were fabricated by the MUMPs surface micromachining process. The microstructures were then coated on both sides with a 40 nm thick amorphous Al2O3 layer by ALD. The beam and plate microstructures were initially thermal cycled between room temperature and 190°C tostabilize the gold microstructure. After the initial thermal cycles, the microstructures were cooled from 190°C to 120°C and held at 120°C for about 2000 hours (three months). We measured, using an interferometric microscope with a custom-built temperature chamber, full-field deformed shapes (and from these determined the average curvatures in x- and y- directions) of the microstructures during the initial thermal cycles, during the cooling process from 190 °C to 120 °C, and during the isothermal hold. Measurements were made on both coated and uncoated microstructures to assess the influence of the coating. We find that while the 40 nm thick coating has a small effect on the thermoelastic response of the microstructure, it significantly reduces the extent of stress relaxation during the isothermal hold. We modeled the curvature evolution with time assuming the stress relaxation mechanism is power-law creep in the gold, ε˙ = Aσn, and that the polysilicon and alumina deform elastically. The simple model describes the observed behavior reasonably well for the uncoated microstructures (when the power-law parameters are fit using the measured curvature), however, for the coated microstructures, the model predicts a decrease in the stress relaxation, but nowhere near the magnitude observed. This suggests that not only is the stress state in the gold film altered by the nanoscale coating, but also the fundamental deformation mechanisms are altered.
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Chen, Ping-Hei, Hung-Hsia Chen, Bo-Rui Huang et Long-Sheng Kuo. « Thermal Performance of a Flat Plate Heat Pipe With Gradient Wettability ». Dans ASME 2013 Heat Transfer Summer Conference collocated with the ASME 2013 7th International Conference on Energy Sustainability and the ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/ht2013-17033.
Texte intégralRésumé :
Many studies have been performed on the flat-plate heat pipes with sintered wick. It was found that during the evaporation process, the heat transfer characteristics of hydrophilic surface performed better than hydrophobic surface. This work investigated the heat transfer characteristics of flat-plate heat pipes in which the bottom surface was modified with various gradient contact angles by a sol-gel method. This method was applied to create a gradient surface on copper-plate surface. The coated nanoparticles were immobilized on the surface after the surface was heated in a furnace at a working temperature of 120°C. The thermal resistance results of flat plate heat pipes with either homogeneous superhydrophilic surface or a gradient wettability are reported in this study. For the gradient wettability, the evaporation region was super-hydrophilic and the condense region was super-hydrophobic. The heat transfer ability was both increased in evaporation region and condense region. Furthermore, the reflux ability of the working fluid was performed better due to the unbalanced surface tension on the gradient surface and the impact of gravity force of inclination angle (α). By manipulating different surfaces with different contact angles (gradient surface, contact angle = 150 ° /110 ° /20 ° /10 ° and uniform surface, contact angle <10°) and different inclination angles (α = 0°, 10°), we managed to find the better combination to improve the thermal performance of flat-plate heat pipe. The results indicated that the thermal performance of flat plate heat pipe with a gradient wettability is better than homogeneous superhydrophilic surface. The evaporation resistance of gradient wettability surface (gradient & α = 10°) has achieved to 0.098 °C /W, and reduced 30% than homogenous superhydrophilic surface (CA <10° & α = 0°). The gradient wettability surface in this work performed as well as the traditional sintered wick flat-plate heat pipe.
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Demir, Ebru, Muhsincan Sesen, Turker Izci, Wisam Khudhayer, Tansel Karabacak et Ali Kosar. « Subcooled Flow Boiling Over Nanostructured Plate Integrated Into a Rectangular Channel ». Dans ASME 2013 11th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/icnmm2013-73154.
Texte intégralRésumé :
Sub-cooled flow boiling was investigated over nanostructured plate (of dimensions 20mm×20mm) integrated to a rectangular channel (of dimensions 33mm×9mm×33mm) at flow rates ranging from 69 ml/min to 145 ml/min. The configuration of the nanostructured plate includes ∼600 nm long copper nanorod arrays with an average nanorod diameter of ∼150 nm. The nanorod arrays are integrated to copper thin film (∼300 nm thick) coated on silicon wafer surface and GLAD (Glancing Angle Deposition) technique was implemented to form the nanostructure configuration. The dimensions and flow rates were chosen to ensure that no change in the nanostructure configurations occurred during the experiments so that the configuration could be used for many experiments. For this, applied heat fluxes (<42 W/cm2) were adjusted in such a way that the wall superheats did not exceed 30°C to avoid any damage on nanostructures. Deionized-water was propelled with a gear pump into the rectangular channel over plates with both plain and nanostructured surface, which were heated with cartridge heaters. Forced convective boiling heat transfer characteristics of the nanostructured plate is investigated using the experimental setup and compared to the results from the plate with plain surface. A significant increase in boiling heat transfer was observed with the nanostructured plate. In the light of the obtained promising results, channels with nanostructured surfaces were proven to be useful particularly in various applications such as cooling of small electronic devices, where conventional surface enhancement techniques are not applicable.
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Jared, David A., Kristina M. Johnson et Garret Moddel. « Joint transform correlation using optically addressed chiral smectic liquid crystal spatial light modulators ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1989. http://dx.doi.org/10.1364/oam.1989.thi5.
Texte intégralRésumé :
Experimental results of joint transform correlators that utilize a high speed, binary or analog, optically addressed spatial light modulator (OASLM) in the Fourier plane are presented. The OASLMs consist of an amorphous silicon photosensor and a smectic A* or C* ferroelectric liquid crystal modulator. The OASLMs were used to compute the power spectra of the interfering Fourier transforms of the input and reference images. The devices are fabricated by depositing an a-Si:H photodiode in the PIN configuration on an indium-tin-oxide coated sheet of soda lime glass. A chiral smectic ferroelectric liquid is sandwiched between the a-Si:H thin film and another indium-tin-oxide coated sheet of glass. This produces a switchable halfwave plate at the read beam wavelength. For the smectic A* OASLM, heating elements are used to raise the temperature of the ferroelectric liquid crystal above the smectic C*—A* phase transition. The active area of the devices is a 1.27-cm diam circle. The devices exhibit response times of 10-155 µs with a resolution of 40 line pairs/mm.