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Oxidation Performance and Interdiffusion Behaviour of two MCrAlY coatings on a Fourth-Generation Single-Crystal Superalloy

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Acta metallurgica Sinica(English Letters) 2022年第4期35卷 679-692页

作者： K.J.Tan J.J.Liang X.G.Wang X.P.Tao J.Gong C.Sun Y.Z.Zhou X.F.Sun Institute of metal Research Chinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China

The oxidation behaviour of a fourth-generation single-crystal superalloy without coating and with two types of MCrAlY coatings at 1140℃was *** results showed that both coatings greatly improved the oxidation resistance of the superalloy,and the addition of Hf further improved the oxidation resistance by pinning the oxide layer into the *** and after oxidation,obvious Cr and Al interdiffusion was *** Cr diffusion induces the precipitation of a topologically close-packed phase,while the diffusion of Al affects the structure of theγ/γ’phase,the solubility of refractory elements,and the formation of an interdiffusion zone.

关键词： Superalloys metal coatings Oxidation Electron probe microanalyser(EPMA) Element diffusion

Design of high-sensitivity metal-coated LPFG sensor based on material dispersion

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Optoelectronics Letters 2012年第4期8卷 269-272页

作者：石彦军顾铮■ Laboratory of Photoelectric Functional Films University of Shanghai for Science and Technology

A high-sensitivity metal-coated long-period fiber grating(LPFG) sensor based on material dispersion is *** on the coupled mode theory,the influence of the material dispersion on the dual-peak characteristics of the metal-coated LPFG is *** considering the material dispersion,the jumping region of the dual-resonant-wavelength shifts toward the thinner film thickness,and the sensitivity of the dual-peak metal-coated LPFG sensor to liquid refractive index(RI) can be obtained to supply accurate parameter ***,two kinds of silver-coated LPFGs with different film thicknesses and grating periods are fabricated to monitor the salt solution,and the sensitivities of these two sensors are *** experimental results are consistent with the theoretical analyses.

关键词： Dispersion (waves) Film thickness metal coatings Refractive index Sensors

Welding-packaged accelerometer based on metal-coated FBG

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Chinese Optics Letters 2013年第7期11卷 21-23页

作者：郭永兴张东生周祖德熊丽邓希望 National Engineering Laboratory for Fiber Optic Sensing Technology Wuhan University of Technology Key Laboratory for Fiber Optic Sensing Technology and Information Processing Wuhan University of Technology

A fiber Bragg grating-based accelerometer with a fully metalized package is presented. Magnetron sput- tering and electroplating techneques are successively adopted to metalize bare sin2 fiber with a single Bragg grating. Laser welding techneque is adopted to fix the metal-coated fiber on the sensor component to obtain a fully metallized package without adhesives. Vibration test results demonstrate that the ac- celerometer has a flat frequency response over a 1-kHz bandwidth, with a resonance frequency of 3.6 kHz, wide linear measurement range of uo to 8 ~. and sensitivitv of 1.7 nm/~.

关键词： Fiber Bragg gratings metal coatings metallizing

Design of tunable metal-coated long-period fiber grating filter with dispersion consideration

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Chinese Optics Letters 2012年第8期10卷 7-10页

作者：石彦军顾铮■ Laboratory of Photo-electric Functional Films University of Shanghai for Science and Technology

The design of a tunable metal-coated long-period fiber grating （LPFG） filter based on the material dispersion consideration is presented. The tuning of the resonant wavelength can be achieved by heating the metal layer. Based on the coupled mode theory, the influences of the material dispersion on the transmission spectrum of the metalcoated LPFG are studied. There is a special grating period for a specific cladding mode; when the grating period is less than or equal to the special grating period, the material dispersion has weak influence on the resonant wavelength. Under such condition, the attenuation band depth corresponding to the specific cladding mode has excellent stability while the temperature changes, thus improving the filtering performances of the tunable loss filter. Further, experimental results demonstrate the validity and feasibility of the proposed tunable filter.

关键词： Diffraction gratings Dispersion (waves) metal coatings

Corrosion Control of Coated Structural Components in Marine Environment

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Sustainable Marine Structures 2019年第1期1卷 21-34页

作者： G.L.Manjunath S.Surendran Department of Ocean Engineering Indian Institute of Technology MadrasChennaiIndia

Tropical waters are with more salinity and harbor millions of micro *** environmental condition challenges the strength and reliability of marine *** behaviour of structural materials due to pitting and uniform corrosion is studied,and a method based on coating is suggested to improve the life cycle ensuring reliability in its *** structural materials like high strength steel and AA6063 were selected for the study and metallic coating performed for evaluation of corrosion *** are investigated in chloride concentration of 3.5%NaCl by weight loss measurements and potentiodynamic *** coating was done by electroplating and PVD(Physical Vapour Deposition)method for high strength steel,where as aluminum samples were coated by an electroplating *** high strength steel samples were mono coated by Ni and Cr using the electroplating method,and composite coating was done with Al-N(Aluminium nitride)and Ti-Al-N(Titanium Aluminium Nitride)by PVD *** electron microscopy(SEM)was used for evaluation of fracture toughness of coating around the pits *** investigation showed that the methods and thickness of coating influenced corrosion resistances of the substrate *** coated samples by PVD showed excellent corrosion resistance properties compared to electroplated samples after the *** element analysis was performed by FRANC 2D/L(Fracture Analysis Code)showed a decrease in stress intensity values for composite coated samples of PVD compared to mono coated electroplated *** in the duty cycle of the structure was observed in the simulation has a result of a decrease in stress intensity values for PVD coated samples.

关键词： Aluminum metal coatings Steel SEM Weight loss Pitting corrosion