The Spectral Emissivity of an Oxide Film of Zirconium for Wavelengths of 530 and 650 nm in the Temperature Range from 1450 to 1750 K

Chekhovskoi, V. Ya.; Tarasov, V. D.; Grigor'eva, N. V.

doi:10.1023/b:hite.0000026157.04515.18

Cited by 9 publications

(4 citation statements)

References 2 publications

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“…In this approach, a variation of the sample normal emittance with temperature is treated as a result of a temperature variation of the absorption coefficient. The observed increase in the emittance with temperature (excluding water spectral band at moderate temperatures) is in a good qualitative agreement with the results reported in papers for both infrared and visible spectral ranges.…”

Section: Analysis Of Experimental Results and Theoretical Modelingsupporting

confidence: 92%

High Temperature Infrared Properties of YSZ Electrolyte Ceramics for SOFCs: Experimental Determination and Theoretical Modeling

et al. 2011

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Infrared radiative properties of 8-mol%-yttria-stabilized zirconia (8YSZ) ceramics of porosity 3% as applied as electrolyte for solid oxide fuel cells (SOFCs) were studied at room and elevated temperatures in the wavelength range from 2 to 20 lm. The room-temperature directional-hemispherical measurements of reflectance and transmittance for thin samples were combined with normal emittance measurements at several temperatures up to 1700 K. The use of the radiation transfer theory in a region of semi-transparency enabled identification of absorption and scattering properties of the material. Both a detailed numerical procedure using the known discrete ordinates method and a novel iterative analytical solution were employed. An analysis based on the Mie theory confirms volumetric scattering by sub-micron size polydisperse pores in the ceramics. It is shown that the absorption coefficient of 8YSZ increases considerably with temperature. This effect should be taken into account in combined heat transfer calculations for SOFCs.

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Section: Analysis Of Experimental Results and Theoretical Modelingsupporting

confidence: 92%

High Temperature Infrared Properties of YSZ Electrolyte Ceramics for SOFCs: Experimental Determination and Theoretical Modeling

et al. 2011

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“…Disk II initially started off with a similar calculated emissivity value between 1500 and 1550°C, but with rising temperature fell to around 0.80. This was expected, where in the insets in Figure 2, the surface of Disk II was shown to be lighter in colour than that of Disk I, due to the formation of a continuous HfO 2 -SiO 2 film, where even a thin MeO 2 film can lower the emissivity [28,29]. Disk IV also begins with an emissivity between 0.85 and 0.90 at 1600°C, but then rapidly falls off with temperature for an emissivity of near 0.75 calculated around 1750°C.…”

Section: Resultsmentioning

confidence: 91%

Oxidation response of a SiCf/SiC CMC with a HfB₂-based coating in an arc jet test

Carney

King

Fumo

et al. 2018

Advances in Applied Ceramics

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The behaviour of a SiC-fibre-reinforced composite with a graded matrix was investigated in an arc jet facility. The graded matrix was comprised of several layers of silicon carbide that transition to a mixed SiC-HfB 2 top layer and was sealed with an HfB 2-SiC coating. Samples were exposed to maximum specific total enthalpy hypersonic flow between 14 and 17 MJ kg −1 under stagnation pressures between 2700 and 3050 Pa for hold times of between 137 and 395 s. The resulting sample surface temperatures ranged between 1600 and 1950°C. Spectral emissivity at about 1 μm was calculated using a pyrometer capable of switching between one and two color modes and was shown to decrease with oxidation and removal of SiO 2 from the surface. The impacts of the surface chemistry changes during oxidation and of active oxidation were investigated.

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“…Noble metallic materials are often used in insulating glazing films (low‐emissivity films) due to their excellent electrical conductivity and low infrared emissivity. However, these properties can easily be degraded by surface oxidation and corrosion . Silver (Ag) is typically chosen for low‐emissivity (low‐e) films as Ag exhibits high reflectivity in the infrared region and comparatively low absorption in the visible region .…”

Section: Introductionmentioning

confidence: 99%

Effect of TaN_x on electrical and optical properties of annealed TaN_x/Ag/TaN_x films

Akepati

Loka

et al. 2013

Surface & Interface Analysis

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As‐deposited Ag(10 nm)/glass films exhibited agglomerated nanocrystals with seemingly thick boundaries. Introduction of a TaNx layer below the Ag films resulted in dense and smooth structures, with a resistance at least three times lower than that of Ag/glass. For TaNx(10 nm)/Ag(10 nm)/TaNx(10 nm)/glass multilayer films, Auger electron spectroscopy results indicate that TaNx acts as an effective barrier restraining the diffusion of Ag. After annealing (up to 573 K), no outward diffusion of Ag through either TaNx layer was seen. However, partial oxidation of the outermost TaNx layer to form Ta2O5 was observed. The films showed promising optical properties with 73% transmittance in the visible region and ~15% average transmittance in the near‐infrared region. The optical data obtained here was in good agreement with simulated predictions. Copyright © 2013 John Wiley & Sons, Ltd.

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The Spectral Emissivity of an Oxide Film of Zirconium for Wavelengths of 530 and 650 nm in the Temperature Range from 1450 to 1750 K

Cited by 9 publications

References 2 publications

High Temperature Infrared Properties of YSZ Electrolyte Ceramics for SOFCs: Experimental Determination and Theoretical Modeling

High Temperature Infrared Properties of YSZ Electrolyte Ceramics for SOFCs: Experimental Determination and Theoretical Modeling

Oxidation response of a SiCf/SiC CMC with a HfB₂-based coating in an arc jet test

Effect of TaN_x on electrical and optical properties of annealed TaN_x/Ag/TaN_x films

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The Spectral Emissivity of an Oxide Film of Zirconium for Wavelengths of 530 and 650 nm in the Temperature Range from 1450 to 1750 K

Cited by 9 publications

References 2 publications

High Temperature Infrared Properties of YSZ Electrolyte Ceramics for SOFCs: Experimental Determination and Theoretical Modeling

High Temperature Infrared Properties of YSZ Electrolyte Ceramics for SOFCs: Experimental Determination and Theoretical Modeling

Oxidation response of a SiCf/SiC CMC with a HfB2-based coating in an arc jet test

Effect of TaNx on electrical and optical properties of annealed TaNx/Ag/TaNx films

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Product

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Oxidation response of a SiCf/SiC CMC with a HfB₂-based coating in an arc jet test

Effect of TaN_x on electrical and optical properties of annealed TaN_x/Ag/TaN_x films