Academic literature on the topic 'Multi-layered coating'

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Journal articles on the topic "Multi-layered coating"

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Tamura, Motonori. "Hydrogen Permeation of Multi-Layered-Coatings." Advanced Materials Research 1152 (April 2019): 9–18. http://dx.doi.org/10.4028/www.scientific.net/amr.1152.9.

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Using a substrate of AISI 316L austenitic stainless steel, which is used for components in high-pressure hydrogen systems, the hydrogen barrier properties of samples with single-layer coatings of TiC, TiN, and TiAlN as well as a multi-layered coating of TiAlN and TiMoN were evaluated. The ion plating method was used, and coating thicknesses of 2.0–2.6 μm were obtained. Hydrogen permeation tests were carried out under a differential hydrogen pressure of 400 kPa and at a temperature between 573 and 773 K, and the quantities of hydrogen that permeated the samples were measured. This study aimed a
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Fu, Dong Xing, Jing Na Liu, Er Bao Liu, Zhao Bin Cai, Xiu Fang Cui, and Guo Jin. "Thermal Shock Resistance of Plasma Sprayed Multi-Layered Functionally Graded Cr3C2-NiCr Coatings." Materials Science Forum 852 (April 2016): 1000–1005. http://dx.doi.org/10.4028/www.scientific.net/msf.852.1000.

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The interface properties of multi-layered functionally graded Cr3C2-NiCr coatings deposited by plasma spraying technique were experimentally studied in this paper. The microstructure and phase structure of coatings were studied with scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). The thermal shock resistance was investigated by cyclic heating and cooling tests using an electro-calefaction furnace. The crack appearances of the coatings were observed carefully. Results show that the plasma sprayed multi-layered functionally graded coatings ar
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Wilkens, H. L., J. Gunther, M. P. Mauldin, et al. "Progress in Coating Multi-Layered Cocktail Hohlraums." Fusion Science and Technology 49, no. 4 (2006): 846–50. http://dx.doi.org/10.13182/fst06-a1212.

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Murthy, A. K., K. Komvopoulos, and S. D. Brown. "Processing and Characterization of Multi-Layered Wear-Resistant Ceramic Coatings." Journal of Engineering Materials and Technology 112, no. 2 (1990): 164–74. http://dx.doi.org/10.1115/1.2903303.

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A new concept of a multi-layered ceramic coating consisting of a porcelain enamel bond interlayer with thermal expansion characteristics tailored to match those of a cast iron substrate and a plasma-sprayed wear-resistant surface layer of chromium oxide, chromium carbide, or partially stabilized zirconia was investigated. Flat substrates of grit-blasted and surface-treated cast iron were slurry sprayed with a finely ground glass frit mixed with isopropyl alcohol and water. Subsequently, the specimens were dried in an oven before firing at 1023 K to produce a smooth, dense, and strongly adheren
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Chi, Shyang-ho, and Yen-Ling Chung. "Cracking in coating–substrate composites with multi-layered and FGM coatings." Engineering Fracture Mechanics 70, no. 10 (2003): 1227–43. http://dx.doi.org/10.1016/s0013-7944(02)00114-5.

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Lin, Ji, A. O. Kunrath, D. Zhong, S. Myers, Brajendra Mishra, and John J. Moore. "Development of Multi-Layered and Graded Die Coatings for Materials Processing Applications." Advances in Science and Technology 45 (October 2006): 1145–54. http://dx.doi.org/10.4028/www.scientific.net/ast.45.1145.

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The paper will present the methodology used to design optimized die coatings employed in material forming processes in an effort to extend the life and effect efficient operation of the dies. An optimized die coating 'architecture' requires that the coating system be essentially non-wetting with the material (metal, glass, polymer) being formed in the die, coupled with good wear and oxidation resistance Other factors, such as delaying the onset of thermal fatigue cracking (heat checking), and an acceptably low coefficient of friction. And, possibly, self-lubricating, also need to be considered
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Teng, Ying Yuan, Qian Chen, and Li Xin. "The Effect of Coatings on the Cyclic Oxidation Behaviour of Ti6Al4V at 750°C." Advanced Materials Research 393-395 (November 2011): 428–35. http://dx.doi.org/10.4028/www.scientific.net/amr.393-395.428.

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For improvement of the cyclic oxidation resistance of the Ti6Al4V alloy, multi-layered Ti50Al50N/Ti70Al30N and mono-layered Ti60Al30Si10N were deposited on the alloy. It has been found that both coatings provide an effective protection for substrate alloy and the cyclic oxidation resistance of the TiAlSiN coating is better. After cyclic oxidation, it has been found that N diffused into the substrate alloy.
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Chen, E., Kun Peng, Wu Lin Yang, Jia Jun Zhu, De Yi Li, and Ling Ping Zhou. "Corrosion Resistance of Sintered NdFeB Magnets with Various Surface Coatings." Applied Mechanics and Materials 492 (January 2014): 263–67. http://dx.doi.org/10.4028/www.scientific.net/amm.492.263.

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Pure Ni coating and multi-layered Ni-P coatings were deposited on sintered NdFeB magnets by ion beam sputtering and electroless plating to improve the corrosion resistance of magnets, respectively. The structure and preferred growth orientation, surface morphology, the adhesive strength between coatings and magnets, and corrosion properties of samples were investigated by XRD, SEM, high-low temperature shock test and potentiodynamic polarization curves, respectively. It was found that electroless Ni-P coatings are amorphous with nodules distributed, Ni coating deposited by ion beam sputtering
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Vereschaka, A. A., A. S. Vereschaka, S. N. Grigoriev, and D. V. Sladkov. "Nano-Scale Multi-Layered Coatings for Cutting Tools Generated Using Assisted Filtered Cathodic-Vacuum-Arc Deposition (AFCVAD)." Applied Mechanics and Materials 325-326 (June 2013): 1454–59. http://dx.doi.org/10.4028/www.scientific.net/amm.325-326.1454.

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The subject of this study were nano-nanoscale multilayer coatings formed using the process of filtered cathodic vacuum arc deposition in assisting high-energy ions of chromium. We used a special emitter (implantor) to generate chromium ions with high energy. Such key parameters of coatings as composition, structure, a thickness, hardness, adhesion in relation to a substrate obtained at various energy of chrome ions have been studied. It is establish the positive change of key properties of coating deposited on carbide inserts WC/CrC/Co, WC / (Co-Re), TiC/TaC/Co at assisted impact of ions Cr at
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Qasim, Tarek, Yeo Khee Wee, Wei Lun Cai, and Xiao Zhi Hu. "Contact Damage of Curved Multi-Layered Ceramics: Prepared by Slip Casting Technique." Key Engineering Materials 417-418 (October 2009): 461–64. http://dx.doi.org/10.4028/www.scientific.net/kem.417-418.461.

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Contact damage of curved multi-layered systems, consisting of a brittle zirconia (3Y-TZP)/Alumina (Al2O3) coating – prepared by slip casting – on a compliant polymeric substrate from indentation by a hard tungsten carbide sphere is investigated. The essence of this study is to compare the structural performance of layered ceramics, and monolithic ceramic in the brittle coating and compliant substrate of dental crown-like systems. The specimens are loaded at the axis of symmetry. The failure evolution to initiate cracking and final failure patterns in curved multi-layered specimens are compared
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Dissertations / Theses on the topic "Multi-layered coating"

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Li, Ran. "Isothermal Oxidation Study of Gd2Zr2O7/YSZ Multi-Layered Thermal Barrier Coatings." Thesis, Högskolan Väst, Avd för tillverkningsprocesser, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-8139.

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Conventional yttria stabilized zirconia (YSZ) are widely used in the gas turbine to protect the substrate material from high temperature. But the common YSZ top coatings have limitations at higher temperature (above 1200 ℃) due to significant phase transformation and intensified sintering effect. Among the list of pyrochlores, gadolinium zirconate offer very attractive properties like low thermal conductivity, high thermal expansion coefficient and CMAS resistance. However, a lower fracture toughness than YSZ and tendency to react with alumina (thermal grown oxide) can lead to lower lifetime.
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Vallien, Ante. "Material characterization of multi-layered Zn-alloy coatings on fasteners : Effects on corrosion resistance, electrical conductivity and friction." Thesis, KTH, Materialvetenskap, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-240956.

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Electroplated zinc-alloy coatings have been used on fasteners in the automotive industry for many years. The coating often consists of three layers: a zinc-alloy layer, a passivation layer and a sealer or top-coat. The coating layers affect the functional properties of the fastener (mainly the corrosion resistance, friction coefficient and electrical conductivity), and the aim of this thesis has been to increase the understanding of how these functional properties are affected by the properties of the coating. The corrosion resistance, friction coefficient and electrical conductivity of severa
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Mahade, Satyapal. "Functional Performance of Gadolinium Zirconate/Yttria Stabilized Zirconia Multi-Layered Thermal Barrier Coatings." Licentiate thesis, Högskolan Väst, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-9854.

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Yttria stabilized zirconia (YSZ) is the state of the art ceramic top coat material used for TBC applications. The desire to achieve a higher engine efficiency of agas turbine engine by increasing the turbine inlet temperature has pushed YSZ toits upper limit. Above 1200°C, issues such as poor phase stability, high sinteringrates, and susceptibility to CMAS (calcium magnesium alumino silicates) degradation have been reported for YSZ based TBCs. Among the new materials,gadolinium zirconate (GZ) is an interesting alternative since it has shown attractive properties including resistance to CMAS at
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Kuo, Chi-Wei 1982. "Guided Wave Propagation in Tubular Section with Multi-Layered Viscoelastic Coating." Thesis, 2012. http://hdl.handle.net/1969.1/148398.

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Three kinds of propagating waves physically admissible in a tubular section are derived to establish their dispersion characteristics in response to the presence of multi-layered viscoelastic coatings. One is the longitudinal wave that propagates in the axial direction. The other two are shear and longitudinal waves along the circumferential direction. To characterize the hollow cylinder with coating layers, wave dispersion and attenuation are studied using the “global matrix” technique. Since each layer is considered to be perfectly bonded to each other, displacement and strain continuity
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Huang, Wei-Hao, and 黃韋豪. "Development of multi-layered acoustic absorption coatings." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/j5yhau.

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碩士<br>國立臺北科技大學<br>材料科學與工程研究所<br>106<br>This study is to prepare a multifunctional coating with acoustic absorption and anti-corrosion by thermal spray. In the marine environment, the problem of corrosion resistance is particularly important. Spray zinc-aluminum alloy as an anti-corrosion coating, aluminum can form a passivation film on the surface as a barrier protection, zinc as a sacrificial anode to protect the internal steel, and then spray polymer materials as a sealing layer to increase the anti-corrosion effect. In addition, the polymer materials had the characteristics of viscoelastic
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Postolnyi, Bogdan. "Superhard Protective Coatings with Enhanced Toughness: Multi-Layered Nanocomposite Metal Nitrides." Tese, 2020. https://hdl.handle.net/10216/130335.

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Postolnyi, Bogdan. "Superhard Protective Coatings with Enhanced Toughness: Multi-Layered Nanocomposite Metal Nitrides." Doctoral thesis, 2020. https://hdl.handle.net/10216/130335.

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Kuznetsova, Alena. "Layered Double Hydroxides (LDH) as versatile nanoreservoirs for application in multi-functional coatings." Doctoral thesis, 2020. http://hdl.handle.net/10773/30586.

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The objective of the present work is synthesis and characterization of inorganic nanoreservoirs based on layered double hydroxides (LDH) loaded with active species, namely corrosion inhibitors and pH indicators. The most attractive feature of LDH is the anion-exchange ability. Despite the countless studies that describe the use of LDH for applications in protective coatings for anti-corrosion applications, the study related to immobilization and consequent release of anionic species is somewhat limited. Besides, there is still a lack of systematic studies correlating the structure of na
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Lin, Chien-an, and 林建安. "Characterization of multi-layered SiOxNy:H/SiCxNy:H antireflection coatings by electron cyclotron resonance chemical vapor deposition and their application on silicon solar cells." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/07841604999596231698.

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碩士<br>國立中央大學<br>材料科學與工程研究所<br>101<br>It is well-known that a good antireflective coating, which could reduce the photocurrent loss and enhance the photoelectric conversion efficiency, is important for solar cells. Hydrogenated silicon nitride layers (SiNx:H) are most widely used for crystalline silicon solar cells as single-layer antireflection coatings (ARCs). However, low reflectance could only be obtained from a single-layer ARC at a specific wavelength. In order to further minimize the front reflection of solar cells, double-layer ARCs consisting of two different materials (such as MgF2/Ce
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Book chapters on the topic "Multi-layered coating"

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Sato, Masato, and Hideto Suzuki. "Guarantee on Fatigue Reliability of Multi-Layered DLC-Coating Given to CD-Carburized SCM415." In Fracture and Strength of Solids VI. Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-989-x.193.

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Kumar, Ch Sateesh, Pawan Kumar, Kamlesh Kumar, et al. "Investigation on the Stress Distribution During Hard Turning of AISI 52100 Steel Using Al2O3/TiCN Cutting Tool Coated with Mono-layered AlCrN and Multi-layered AlTiN/TiN Coating." In Springer Proceedings in Materials. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-3937-1_27.

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UENO, Shunkichi, Tatsuki OHJI, and Hua-Tay LIN. "Development of Multi-Layered EBC for Silicon Nitride Ceramics." In Advanced Ceramic Coatings and Interfaces II. John Wiley & Sons, Inc., 2009. http://dx.doi.org/10.1002/9780470339510.ch20.

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Lin, Ji, A. O. Kunrath, D. Zhong, S. Myers, Brajendra Mishra, and John J. Moore. "Development of Multi-Layered and Graded Die Coatings for Materials Processing Applications." In Advances in Science and Technology. Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/3-908158-01-x.1145.

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Jacques, Sylvain, and Houssam Fakih. "(SiC/Ti3SiC2)n Multi-Layered Coatings Deposited by CVD." In Advances in Science and Technology. Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/3-908158-01-x.1085.

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Choe, Han Cheol, and William A. Brantley. "Effects of Multi-Layered TiN/ZrN/Tooth-Ash Composite Coatings on the Surface Characteristics of Ti-(Nb, Zr, Ta, Hf) Dental Implant Alloys with Low Elastic Modulus." In Advanced Materials Research. Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-463-4.825.

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S. Bhat, Ramesh. "Fabrication of Multi-Layered Zn-Fe Alloy Coatings for Better Corrosion Performance." In Liquid Metals [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.99630.

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Zn-Fe compositionally modulated multilayer alloy (CMMA) coatings were developed onto low carbon steel from acid sulphate bath; and their corrosion resistance was calculated using Tafel polarization and impedance methods. The deposit layers were formed galvanostatically by single bath technique (SBT), using square current pulses. An optimal configuration for the growth of most corrosion resistant Zn-Fe coating was proposed and discussed. At maximum switching cathode current density (SCCD) (2.0–5.0 A dm−2), the deposit with 300 layers showed ~43 times superior corrosion resistance than the same thickness of monolayer coating. The improved corrosion resistance of multilayered coatings is due to small change in iron content, leading to change the phase structure of the alternate-layers of the alloy coatings. The surface morphology and structure of film and roughness of the deposit were assessed using Scanning Electron Microscopy and Atomic Force Microscopy. Thus, superior corrosion resistance of Zn-Fe multilayer coatings was used for industrial applications including defense, machinery and automobile etc.
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Hoddeson, Lillian, and Peter Garrett. "Solar Energy: Working at the Edge of Feasibility (1979–2007)." In The Man Who Saw Tomorrow. The MIT Press, 2018. http://dx.doi.org/10.7551/mitpress/9780262037532.003.0009.

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Ovshinsky was not the inventor of thin-film amorphous silicon solar cells, but under his direction ECD greatly improved their efficiency and dramatically lowered their cost through Ovshinsky’s invention of a system for mass-producing the cells “roll-to-roll” in a continuous process. While Ovshinsky conceived of this process, it was the job of his talented staff to solve the incredibly challenging engineering problems involved in roll-coating the multi-layered solar panels without cross-contamination. Over nearly three decades, ECD scientists built a series of progressively larger solar cell production machines delivering higher and higher annual power wattage (eventually 30 megawatts), drawing on support first from ARCO and later from Sohio, Sharp, Canon, Sovlux, and Bekaert. ECD’s United Solar division eventually became the leading US producer of thin-film solar panels.
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Conference papers on the topic "Multi-layered coating"

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Tamura, M., M. Takahashi, J. Ishii, K. Suzuki, M. Sato, and K. Shimomura. "Multi-Layered Thermal Barrier Coating for Land-Based Gas Turbines." In ITSC 1997, edited by C. C. Berndt. ASM International, 1997. http://dx.doi.org/10.31399/asm.cp.itsc1997p0323.

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Abstract Multi-layered thermal barrier coatings (TBC) having different functions were proposed for the hot section components of land-based gas turbines. This paper describes the multi-layered TBC with an oxidation resistant layer. A conventional duplex TBC and a triplex TBC, in which an aluminized layer was added to the conventional duplex TBC to increase oxidation resistance, was prepared. It was confirmed by a burner rig test that the triplex TBC with the aluminized layer is resistant to oxidation and shows high durability in a thermal cycle test, compared with the conventional duplex TBC.
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Kuo, Chi-Wei, and C. Steve Suh. "Guided Wave Propagation in Tubular Section With Multi-Layered Viscoelastic Coating: Part I — Axial Waves." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-65386.

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Propagating waves physically admissible in a tubular section are derived to establish their dispersion characteristics in response to the presence of multi-layered viscoelastic coatings. Longitudinal waves that propagate in the axial direction are studied. To characterize the hollow cylinder with coating layers, wave dispersion and attenuation are studied using the “global matrix” technique. Since each layer is considered to be perfectly bonded to each other, displacement and strain continuity are imposed as the interfacial boundary conditions. Viscoelastic coating materials such as bitumen an
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Kuo, Chi-Wei, and C. Steve Suh. "Guided Wave Propagation in Tubular Section With Multi-Layered Viscoelastic Coating: Part II — Circumferential Waves." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-65390.

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Propagating waves physically admissible in a tubular section are derived to establish their dispersion characteristics in response to the presence of multi-layered viscoelastic coatings. Shear and longitudinal waves along the circumferential direction were investigated. To characterize the hollow cylinder with coating layers, wave dispersion and attenuation are studied using the “global matrix” technique. Since each layer is considered to be perfectly bonded to each other, displacement and strain continuity are imposed as the interfacial boundary conditions. Viscoelastic coating materials such
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Kang, Kyoung-Ho, Rae-Joon Park, Sang-Baik Kim, K. Y. Suh, F. B. Cheung, and J. L. Rempe. "Experiments on Performance of the Multi-Layered In-Vessel Core Catcher." In 12th International Conference on Nuclear Engineering. ASMEDC, 2004. http://dx.doi.org/10.1115/icone12-49193.

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LAVA-GAP experiments are in progress to investigate the performance of the in-vessel core catcher using alumina melt as a corium simulant. The hemispherical in-vessel core catcher made of carbon steel was installed inside the lower head vessel with a uniform gap of 10mm. Until now, two types of the in-vessel core catcher were used in this study. The first one is a single layered in-vessel core catcher without an internal coating of the LAVA-GAP-2 test, and the other one is a two layered in-vessel core catcher with a 0.5mm-thick ZrO2 internal coating of the LAVA-GAP-3 test. Current LAVA-GAP exp
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Verdy, C., B. Serio, and C. Coddet. "In Situ Temperature Measurement Using Embedded Micro-Thermocouples in Vacuum Plasma Sprayed Multi-Layered Structures." In ITSC 1998, edited by Christian Coddet. ASM International, 1998. http://dx.doi.org/10.31399/asm.cp.itsc1998p0821.

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Abstract The integration of thermocouples into thermal spray deposits and especially into vacuum thermal spray coatings could provide temperature monitoring between the substrate and the coating or between two different coatings during the spray process and later during post treatments and service life. Thermocouples of 251µm in diameter were made using Chromel and Alumel wires. Electrical insulation was obtained using a ceramic cement. Astroloy and Copper coatings were successfully sprayed over these sensors and the temperature given by an embedded thermocouple was compared to the response of
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Lara, Luciano de Oliveira Castro, Henara Lillian Costa, and José Daniel Biasoli de Mello. "Influence of Layer Thickness on the Properties of Multifunctional Tribological Coatings." In ASME 2012 11th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/esda2012-82593.

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Multifunctional coatings, widely used in tribological applications, have their properties strongly influenced by the interaction of the system coating/substrate. The use of multi-layered coatings has been pointed out as a solution for the problem of high internal stresses that can be generated in coated systems, in particular in the case of soft substrates. In multilayered coatings, a decrease in the stress gradient between substrate and coating improves adhesion. Moreover, the thickness of the coating has shown a strong influence on the tribological behavior of the coated system. This paper,
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Park, Kyung-Hee, and Patrick Y. Kwon. "Tool Wear Analysis on Multi-Layered Coated Carbide Tools in Face Milling of AISI 1045 Steel." In ASME 2010 International Manufacturing Science and Engineering Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/msec2010-34066.

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Face milling tests on AISI 1045 steel were performed to study the flank wear of multilayered coated carbide tools. The cutting tools were dual (TiN/TiAlN) and triple (TiN/Al2O3/TiCN) layered, coated carbide inserts processed by PVD and CVD respectively. As expected, the depth of cut (DOC) did not play an important role on the development of flank wear while the cutting speed had a significant role in the development of flank wear. Using confocal laser scanning microscopy (CLSM) and wavelet transform, the flank wear evolution was analyzed and abrasive wear was found to be a dominant tool wear m
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Kim, D. W., and K. W. Kim. "Friction and Wear Characteristics of Diamond-Like Carbon (DLC) Coating Used for Machine Elements." In ASME/STLE 2011 International Joint Tribology Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ijtc2011-61071.

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In this study, friction and wear tests were performed in order to investigate the effect of sliding velocity and normal load on the friction and wear characteristics of multi-layered diamond-like carbon (DLC) coating used for machine elements (automotive engine tappet, etc). Friction and wear tests against AISI 52100 bearing steel ball were performed under various sliding velocities (0.25, 0.5, 1 and 2 m/s) and normal loads (6.13, 20.7 and 49.0 N). As a result of test, kinetic friction coefficients and wear rates of multi-layered DLC coating and AISI 52100 bearing steel were obtained under eac
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Ichikawa, Hideki, Toshinobu Uemura, Kazuyosi Sato, Hiroya Abe, Makio Naito, and Yoshinobu Fukumori. "Dry Particle Coating with Polymeric Nanopowders for Fabricating Multi- Layered, Prolonged-Release Microparticles using Theta-Composer®." In 5th Asian Particle Technology Symposium. Research Publishing Services, 2012. http://dx.doi.org/10.3850/978-981-07-2518-1_292.

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Kireitseu, Maksim. "Examining the Fracture of Multi-Layered Coatings by Rheological Modeling of Hertzian Indentation." In International Joint Power Generation Conference collocated with TurboExpo 2003. ASMEDC, 2003. http://dx.doi.org/10.1115/ijpgc2003-40048.

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The present paper describes an application of Hertzian indentation with rheological models as a method for determining the fracture of any multi-layered brittle coating. The advantage of the method revealed here is that the only quantity to be measured is a deformation or a fracture load. Use of a refined stress intensity factor formulation for surface-breaking cracks in steep stress gradients has enabled accurate estimates to be made of the minimum loads necessary to propagate cracks by Hertzian indentation. At present the analysis only applies for the case where the sphere and the substrate
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