Emissivity measurements on aeronautical alloys

Campo, Leire del; Pérez-Sáez, R.B.; González-Fernández, Luis; Esquisabel, Xabier; Fernández, Ignacio; González-Martín, P.; Tello, M. J.

doi:10.1016/j.jallcom.2009.09.091

Cited by 79 publications

(21 citation statements)

References 13 publications

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“…4. Emissivity evolution with the temperature has already been observed in metallic samples in previous studies [22][23][24]. As suggested in Ref.…”

Section: Semi-transparent Spectral Region ( < 9 M)supporting

confidence: 68%

“…As suggested in Ref. [22], the emissivity increase of the bare Inconel 718 could be related to a slight oxidation of the metallic surface. This hypothesis is in agreement with the cracked and porous structure of the TBCs shown in Fig.…”

Section: Semi-transparent Spectral Region ( < 9 M)mentioning

confidence: 57%

“…3 is observed for short wavelengths. Dependence of the emissivity with the thermal history was already observed in other metals and alloys [22][23][24]. …”

Section: Thermal History Dependencementioning

confidence: 82%

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Normal spectral emittance of Inconel 718 aeronautical alloy coated with yttria stabilized zirconia films

González-Fernández¹,

Campo²,

Pérez-Sáez³

et al. 2012

Journal of Alloys and Compounds

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“…4. Emissivity evolution with the temperature has already been observed in metallic samples in previous studies [22][23][24]. As suggested in Ref.…”

Section: Semi-transparent Spectral Region ( < 9 M)supporting

confidence: 68%

Section: Semi-transparent Spectral Region ( < 9 M)mentioning

confidence: 57%

See 1 more Smart Citation

Normal spectral emittance of Inconel 718 aeronautical alloy coated with yttria stabilized zirconia films

González-Fernández¹,

Campo²,

Pérez-Sáez³

et al. 2012

Journal of Alloys and Compounds

Self Cite

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“…It is possible to analyze samples made of opaque or partially transparent materials, materials with a high level of transparency, bulk samples or samples prepared by deposition of a film or coating on a substrate, and samples in a solid or molten state. Details of the measurement of bulk opaque materials can be found in [4,5,14,15,43,59,60]: solid metal samples such as stainless steel, Armco iron, brasses, nickel, and cobalt alloys. In the group of partially transparent bulk materials, analyses were conducted of ZrB 2 -SiC-based ultrahigh-temperature ceramics [39], SiC materials [15,17], dielectric oxides (SiO 2 , Al 2 O 3 , and MgO) [2,4,32], and sapphire, fused silica, and spinel [40].…”

Section: G Application Of Methodsmentioning

confidence: 99%

Survey of emissivity measurement by radiometric methods

Honner

2015

Appl. Opt.

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A survey of the state of the art in the field of spectral directional emissivity measurements by using radiometric methods is presented. Individual quantity types such as spectral, band, or total emissivity are defined. Principles of emissivity measurement by various methods (direct and indirect, and calorimetric and radiometric) are discussed. The paper is focused on direct radiometric methods. An overview of experimental setups is provided, including the design of individual parts such as the applied reference sources of radiation, systems of sample clamping and heating, detection systems, methods for the determination of surface temperature, and procedures for emissivity evaluation.

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“…The literature shows a wide range of emissivity behavior for metals [11][12] . Over reasonable ranges of wavelength, especially for wavelengths longer than 1 μm, Equation 3 is a good approximation of ε(λ) for metal surfaces 13 .…”

Section: Addressing Emissivity Dependance On Wavelengthmentioning

confidence: 99%

Assessing the use of an infrared spectrum hyperpixel array imager to measure temperature during additive and subtractive manufacturing

et al. 2016

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Accurate non-contact temperature measurement is important to optimize manufacturing processes. This applies to both additive (3D printing) and subtractive (material removal by machining) manufacturing. Performing accurate single wavelength thermography suffers numerous challenges. A potential alternative is hyperpixel array hyperspectral imaging. Focusing on metals, this paper discusses issues involved such as unknown or changing emissivity, inaccurate greybody assumptions, motion blur, and size of source effects. The algorithm which converts measured thermal spectra to emissivity and temperature uses a customized multistep non-linear equation solver to determine the best-fit emission curve. Emissivity dependence on wavelength may be assumed uniform or have a relationship typical for metals. The custom software displays residuals for intensity, temperature, and emissivity to gauge the correctness of the greybody assumption. Initial results are shown from a laser powder-bed fusion additive process, as well as a machining process.In addition, the effects of motion blur are analyzed, which occurs in both additive and subtractive manufacturing processes. In a laser powder-bed fusion additive process, the scanning laser causes the melt pool to move rapidly, causing a motion blur-like effect. In machining, measuring temperature of the rapidly moving chip is a desirable goal to develop and validate simulations of the cutting process. A moving slit target is imaged to characterize how the measured temperature values are affected by motion of a measured target.

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Emissivity measurements on aeronautical alloys

Cited by 79 publications

References 13 publications

Normal spectral emittance of Inconel 718 aeronautical alloy coated with yttria stabilized zirconia films

Normal spectral emittance of Inconel 718 aeronautical alloy coated with yttria stabilized zirconia films

Survey of emissivity measurement by radiometric methods

Assessing the use of an infrared spectrum hyperpixel array imager to measure temperature during additive and subtractive manufacturing

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