Ir coating prepared on Mo substrate by double glow plasma

Wang, Liangbing; Chen, Zhaofeng; Zhang, Pingze; Wu, Wangping; Zhang, Ying

doi:10.1007/s11998-008-9123-7

Cited by 25 publications

(14 citation statements)

References 19 publications

(19 reference statements)

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“…However, Ir coating had been deposited on the surface of Mo, Nb 18,19 and carbon/carbon composites by DGP. When the target bias voltage was about 2800 or 2900 V and metal substrate bias voltage was 2300 V, all of the as deposited Ir coatings were composed of the columnar grains with preferential growth orientation of (220) crystal plane, which indicated that the preferential growth orientation was regardless of different deposition parameters and substrate properties.…”

Section: Resultsmentioning

confidence: 99%

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Microstructure and analytic equation of conical aggregate in iridium coating prepared by double glow plasma

Chen

Wang

et al. 2011

Surface Engineering

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Dense and uniform Iridium (Ir) coating was deposited on the surface of the graphite substrate by double glow plasma. The phase identification and the morphology of the coating were examined by X-ray diffraction and scanning electron microscopy, respectively. The coating was composed of uniformly distributed regularly conical aggregates which were composed of the columnar crystals with a preferential (220) orientation. The preferential orientation was regardless of different deposition parameters and substrate properties. The analytic equation of the generatrix of the conical aggregate was determined by measuring its external dimensions. The deposition rate of the coating was up to 20 mm h 21 . The gap appeared within the fracture surface of the coating could result from the shadow effect of the conical aggregate. Because of the poor wetting between Ir element and C element, Ir coating grew according to the Stranski-Krastanov model.

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Section: Resultsmentioning

confidence: 99%

“…18 Three electrodes were designed in the chamber: one anode and two negatively charged members. Both the target and the substrate were the cathode electrodes.…”

Section: Methodsmentioning

confidence: 99%

Microstructure and analytic equation of conical aggregate in iridium coating prepared by double glow plasma

Chen

Wang

et al. 2011

Surface Engineering

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“…A number of type III CO 2 sensing devices using as a solid electrolyte Li 3 PO 4 , LiPON, or LISICON have been discussed for different cell configurations and auxiliary phases showing good sensitivity up to 5000 ppm of CO 2 and acceptably fast response time of 60 s at relatively high operation temperatures above 400 °C. On one side, high operation temperature is beneficial for the sensing reaction kinetics, as well as improved Li + mobility in the TPBs and interfacial region between solid electrolyte and the electrodes, but also results in increased power consumption and may affect long‐term stability of the device, due to possible deterioration processes of the cell components and may obstruct cell integration with control electronic circuits.…”

Section: Literature Review Of the Type III Potentiometric Gas Sensorsmentioning

confidence: 99%

A Simple and Fast Electrochemical CO₂ Sensor Based on Li₇La₃Zr₂O₁₂ for Environmental Monitoring

et al. 2018

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arise to monitor local CO 2 concentration in order to improve energy efficiency and feedback loops on exhausts as data through small sensing devices. Gas sensors integrated as control units into buildings infrastructure, vehicles, smartphones, and wearable devices contribute to real-time georeferenced chemical tracking, working as well as the feedback units to educate consumers and industry. That would allow not only to monitor large-scale industrial CO 2 emission from power generation, food production, or packaging industries, [7] but also emission from nonindustrial buildings in order to improve energy efficiency of households and commercial areas. CO 2 monitoring is also essential for air-quality control of confined spaces such as office/ laboratory areas or marine vessels, where increased carbon dioxide concentration may not only influence laborers' well-being but also serves to assure their safety. Moreover, CO 2 tracking plays a major role in medical diagnosis for respiratory diseases and sleep disorder. [8,9] Nowadays popular CO 2 tracking devices are based on Fourier-transform infrared spectroscopy, showing very good accuracy (±30 ppm of CO 2 , ±2%), selectivity, and fast response times (<20 s.). [10] The nondispersive infrared CO 2 tracking devices are, however, limited by a narrow temperature operation window (0-50 °C), power consumption of around 40 mW for devices being operated in a pulsing mode rather than continuous and also show rather limited potential for further miniaturization due to optical configuration. [11,12] A promising alternative to those rather expensive devices lies in electrochemical potentiometric CO 2 sensors.In general, an electrochemical potentiometric gas sensor has a simple structure of an electrochemical cell, consisting of three functional components, namely, a sensing electrode, a solid-state electrolyte, and a reference electrode (RE). In such an arrangement, it is the selectivity of the electrode materials, which are used to detect gaseous species that is defining an electromotive force (EMF) of the cell, measured as a cell potential. Potential, as an intrinsic property, is independent on geometry or mass changes of the device, offering high scalability potential for future miniaturization. Here, the EMF manifested as voltage through the cell is related to the relative partial pressure of detected specimen at the electrodes as postulated by the Nernst equation. [13] Depending on the relation between gas and mobile specimen in the solid electrolyte, three types of potentiometric gas sensors can be distinguished, according to Weppner's classification [14] (Figure 1).In the goal of a sustainable energy future, either the energy efficiency of renewable energy sources is increased, day-to-day energy consumption by smart electronic feedback loops is managed in a more efficient way, or contribution to atmospheric CO 2 is reduced. By defining a next generation of fast-response electrochemical CO 2 sensors and materials, one can contribute to local monitoring of CO 2 flows from ind...

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“…The Ir coating is the most promising candidate for protective coating of either structural carbon materials [4] or rhenium (Re) rocket thrusters [5] against extreme environments. The Ir coating has been prepared by different deposition methods, including metal-organic chemical vapor deposition (MOCVD) [3,4], CVD [6], magnetron sputtering (MS) [2,5,7], pulsed laser deposition (PLD) [8], laser-induced chemical decomposition (LICD) [9], electroformed deposition (ED) [10,11], double glow plasma (DGP) [12] and so on. At present, the successful application of the Ir coating by MOCVD is used as liquid rocket motor.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Characterization and Mechanical Property of Iridium Coating Produced by Double Glow Plasma

Lin

Chen

et al. 2011

Plasma Chem Plasma Process

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Ir is the most interesting as an effective oxygen diffusion barrier for super hightemperature structural materials. In this study, an Ir coating, approximately 7 lm thick, was deposited onto Mo substrate by double glow plasma at substrate temperature of about 1,120 K in an argon atmosphere. The crystal orientation, morphology and mechanical property of the Ir coating were investigated by XRD, SEM, AFM, TEM, nanoindentation and scratch test. The results indicated that the (220)-oriented Ir coating was composed of the columnar grains. The surface roughness of the Ir coating was higher than that of the substrate. The hardness and the elastic modulus of the Ir coating were about 9.5 and 340 GPa, respectively. The coating had a high hardness due to the sub-micrometer size grains. The coating had good scratch resistance due to the strong adhesion of the coating to the substrate.

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Ir coating prepared on Mo substrate by double glow plasma

Cited by 25 publications

References 19 publications

Microstructure and analytic equation of conical aggregate in iridium coating prepared by double glow plasma

Microstructure and analytic equation of conical aggregate in iridium coating prepared by double glow plasma

A Simple and Fast Electrochemical CO₂ Sensor Based on Li₇La₃Zr₂O₁₂ for Environmental Monitoring

Microstructural Characterization and Mechanical Property of Iridium Coating Produced by Double Glow Plasma

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Ir coating prepared on Mo substrate by double glow plasma

Cited by 25 publications

References 19 publications

Microstructure and analytic equation of conical aggregate in iridium coating prepared by double glow plasma

Microstructure and analytic equation of conical aggregate in iridium coating prepared by double glow plasma

A Simple and Fast Electrochemical CO2 Sensor Based on Li7La3Zr2O12 for Environmental Monitoring

Microstructural Characterization and Mechanical Property of Iridium Coating Produced by Double Glow Plasma

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A Simple and Fast Electrochemical CO₂ Sensor Based on Li₇La₃Zr₂O₁₂ for Environmental Monitoring