High temperature, spectral-directional emittance of high purity nickel oxidized in air

Teodorescu, George; Jones, Peter D.; Overfelt, Ruel A.; Guo, Baojian

doi:10.1007/s10853-006-0914-x

Cited by 5 publications

(3 citation statements)

References 4 publications

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“…The emissivity of nickel oxide (dielectric material) is higher than the emissivity of nickel substrate. The thermal radiation emitted by the oxidized nickel sample is the integration of the emitting radiation from the oxide scale and the transmission radiation from the substrate [9,13]. Therefore, the measured total hemispherical emissivity is actually an "apparent" emissivity of the oxidized sample.…”

Section: Thermal Radiation Propertiesmentioning

confidence: 99%

“…The surface thermal radiation properties of high-temperature metal oxides are also important in high temperature applications. For example, Teodorescu et al [9] studied the spectral-directional emittance of high purity (99.99%) nickel oxidized in air at temperatures between 673 to 873 K. Fu et al [10][11][12][13] measured the total hemispherical emissivity of oxidized nickel at high temperatures using a steady-state calorimetric technique.…”

Section: Introductionmentioning

confidence: 99%

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Correlations between High-Temperature Oxidation Kinetics and Thermal Radiation Characteristics of Micro-Structured Nickel Surfaces Oxidized at 1173 K

Shi

2018

Metals

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Micro-structured surface functional materials were widely used in electronics, batteries, solar cells, and many other products. However, oxidation at high temperatures greatly affects the material service life and performance. This study focuses on the oxide layer characteristics after high-temperature oxidation and the thermal emissivity of metal materials with micro-structured surfaces. Micro-structured surfaces with various groove morphologies were prepared on 99.9% purity nickel samples. The high-temperature oxidation characteristics of the nickel samples with the microstructure surfaces and the total hemispherical emissivities were measured after various oxidation times in high-temperature (1173 K) air to characterize the correlations between the micro-structure surface oxidization and the emissivity at elevated temperatures. The initial surface roughness greatly affects the surface roughness after oxidation with the oxidation increasing the surface roughness on smooth or less rough surfaces but making the surface smoother for very rough surfaces. The oxidation results show that rougher initial surfaces have larger oxide grain sizes with longer oxidation times leading to smaller grain sizes. The measured total hemispherical emissivity increased with the temperature (500–1400 K) and the oxide layer thickness. The experiments further illustrates that, for the same oxide layer thickness, the measured emissivities become larger for oxides with larger grain sizes caused by the rougher original surfaces. This analysis provides an understanding of the oxidation kinetics of microstructured surfaces and how the oxidized microstructure surfaces affect the thermal radiation properties.

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Section: Thermal Radiation Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Correlations between High-Temperature Oxidation Kinetics and Thermal Radiation Characteristics of Micro-Structured Nickel Surfaces Oxidized at 1173 K

Shi

2018

Metals

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“…According to the energy distribution of spectral radiation, 2 cially accounting for different frequency characteristics with different spectral bands about the ripple under plasma background radiation in the dynamic heating environment, to the authors' knowledge, no literature is found on how to identify spectral bands for measurements to improve the fidelity of the non-contact temperature measurement method based on FTIR, though there are reports on testing emissivity by spectrometer in the static heating environments without plasma radiation disturb and the surface temperature is measured by contact methods or pyrometer [6][7][8][9][10][11] . In addition to that, in order to avoid the plasma radiation, the external pyrometer with a defined measuring wavelength is used to obtain the irradiance form the front surface of sample and it's true temperature is measured by a pyrometer based on the sample backside formed similar blackbody cavity assumption during the sample is reached to stable heating state [12] .…”

Section: Introductionmentioning

confidence: 99%

Adaptive spectral band identification method in noncontact temperature measurement based on dynamic programming

et al. 2016

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An adaptive method based on dynamic programming is proposed to identify the spectral band for non-continuous measurement of surface temperature of heatshield materials when Fourier transform infrared (FTIR) spectrometer is used to collect the radiation spectrum in the dynamic heating environment of a high-frequency plasma wind tunnel. First, the radiation spectrum is converted to a time series. Then, high-frequency parts of the measurement spectral signal are obtained by multi-resolution analysis of one-dimensional discrete wavelet and then the suitable spectral band required by a non-contact temperature measurement is adaptively identified based on dynamic programming. Eventually, surface temperature and its corresponding emissivity can be determined. Results of the experiment conducted on a benchmark material (graphite) in the dynamic heating environment of high frequency plasma wind tunnel show the proposed method to be practical.

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Total hemispherical radiation properties of oxidized nickel at high temperatures

Fu¹,

Tan²,

Ren³

et al. 2014

Corrosion Science

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High temperature, spectral-directional emittance of high purity nickel oxidized in air

Cited by 5 publications

References 4 publications

Correlations between High-Temperature Oxidation Kinetics and Thermal Radiation Characteristics of Micro-Structured Nickel Surfaces Oxidized at 1173 K

Correlations between High-Temperature Oxidation Kinetics and Thermal Radiation Characteristics of Micro-Structured Nickel Surfaces Oxidized at 1173 K

Adaptive spectral band identification method in noncontact temperature measurement based on dynamic programming

Total hemispherical radiation properties of oxidized nickel at high temperatures

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