Normal spectral emissivity and heat capacity at constant pressure of Fe–Ni melts

Watanabe, Manabu; Adachi, Masayoshi; Fukuyama, Hidetoshi

doi:10.1007/s10853-017-1122-6

Cited by 24 publications

(11 citation statements)

References 16 publications

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“…Convection in the melts leads to a large uncertainty in thermal-conductivity measurements. To overcome these difficulties, Fukuyama et al developed a noncontact high-temperature thermophysical property measurement method, the Properties and Simulations Probed with Electromagnetic Containerless Technique, [3][4][5][6][7][8][9] referred to as PROSPECT. A schematic diagram of the PROSPECT experimental equipment is presented in Fig.…”

Section: Introductionmentioning

confidence: 99%

Thermophysical Properties of Molten Stainless Steel Containing 5 mass % B₄C

2019

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An electromagnetic levitation technique performed in a static magnetic field was used to measure density, surface tension, normal spectral emissivity, heat capacity, and thermal conductivity of molten 316L stainless steel (SS316L) and SS316L that contained 5 mass % B 4 C. The addition of 5 mass % B 4 C to the SS316L yielded reductions of 111 K, 6%, 19%, and 6% in the liquidus temperature, density, normal spectral emissivity, and thermal conductivity at the liquidus temperature of the SS316L, respectively. The heat capacity increased by 5% with this addition. Although the addition of 5 mass % B 4 C had no clear effect on the surface tensin, sulfur dissolved in the SS316L caused a significant decrease in the surface tension.

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Section: Introductionmentioning

confidence: 99%

Thermophysical Properties of Molten Stainless Steel Containing 5 mass % B₄C

2019

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“…Here, we use EML to in-situ observe its solidification. We developed an EML technique coupled with a static magnetic field in our previous work 24–28 . This technique enables high-precision, non-contact thermophysical measurements of high-temperature melts.…”

Section: Introductionmentioning

confidence: 99%

Study of solidification pathway of a MoSiBTiC alloy by optical thermal analysis and in-situ observation with electromagnetic levitation

Fukuyama

Sawada

Nakashima

et al. 2019

Sci Rep

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MoSiBTiC alloys are promising candidates for next-generation ultrahigh-temperature materials. However, the phase diagram of these alloys has been unknown. We have developed an ultrahigh-temperature thermal analyser based on blackbody radiation that can be used to analyse the melting and solidification of the alloy 67.5Mo–5Si–10B–8.75Ti–8.75 C (mol%). Furthermore, electromagnetic levitation (EML) was used for in-situ observation of solidification and microstructural study of the alloy. On the basis of the results, the following solidification pathway is proposed: Mo solid solution (Moss) begins to crystallize out as a primary phase at 1955 °C (2228 K) from a liquid state, which is followed by a (Moss+TiC) eutectic reaction starting at 1900 °C (2173 K). Molybdenum boride (Mo2B) phase precipitates from the liquid after the eutectic reaction; however, the Mo2B phase may react with the remaining liquid to form Moss and Mo5SiB2 (T2) as solidification proceeds. In addition, T2 also precipitates as a single phase from the liquid. The remaining liquid reaches the (Moss + T2 + TiC) ternary eutectic point at 1880 °C (2153 K), and the (Moss + T2 + Mo2C) eutectic reaction finally occurs at 1720 °C (1993 K). This completes the solidification of the MoSiBTiC alloy.

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“…Figures 4(a) and 4(b) show the wavelength dependence of the normal spectral emissivity of liquid Ni and the temperature dependence of the normal spectral emissivity at a wavelength of 940 nm for liquid Ni, respectively, along with literature data. 5,[15][16][17][18] The vertical dashed line in Fig. 4(b) presents the melting temperature of Ni.…”

Section: Resultsmentioning

confidence: 99%

“…Details of the experimental procedures have been described in previous papers, 5,10,11) therefore only a brief outline is provided here. The normal spectral emissivity ε(λ, T) is defined as the ratio between the normal spectral radiance emitted from a sample R s (λ, T) and from a blackbody R b (λ, T) as: Prior to the measurement of radiation from the liquid Ni-Al sample, a multichannel spectrometer was calibrated using a quasi-blackbody.…”

Section: Methodsmentioning

confidence: 99%

“…1) To design the solution growth technique for AlN, the thermophysical properties of the liquid Ni-Al alloys are needed. In previous work, our group developed a high-temperature thermophysical property measurement system called PROSPECT, [2][3][4][5][6] which uses electromagnetic levitation with a static magnetic field. The density of the liquid Ni-Al alloys was previously measured using PROSPECT.…”

Section: Introductionmentioning

confidence: 99%

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Composition Dependence of Normal Spectral Emissivity of Liquid Ni–Al Alloys

et al. 2021

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Ni-Al alloys are good candidates for the fabrication high-efficiency gas turbine blades. The Ni-Al system is also important as a solution for AlN crystal growth. To accurately model the casting process for turbine blade fabrication and design solution growth techniques for AlN, the thermophysical properties of the liquid alloy are required. In this study, the normal spectral emissivity of Ni-Al liquid alloys was measured using the electromagnetic levitation technique under a static magnetic field. Both the melting temperature of Cu and the eutectic temperature of the Ni-C system were used as fixed temperature points for spectrometer calibration to obtain the radiance of liquid Ni-Al alloys. The composition dependence of the normal spectral emissivity of liquid Ni-Al alloys had a maximum at ~40-50 mol%Al-Ni. The Ni-Al binary system had a stable intermetallic compound of NiAl with a melting temperature of 1 911 K. The short range chemical ordering could be attributed to strong bonding between Ni and Al atoms, which affected the scattering cross section of the conduction electrons even in the liquid state; hence, the normal spectral emissivity had a maximum at ~40-50 mol%Al-Ni.

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Normal spectral emissivity and heat capacity at constant pressure of Fe–Ni melts

Cited by 24 publications

References 16 publications

Thermophysical Properties of Molten Stainless Steel Containing 5 mass % B₄C

Thermophysical Properties of Molten Stainless Steel Containing 5 mass % B₄C

Study of solidification pathway of a MoSiBTiC alloy by optical thermal analysis and in-situ observation with electromagnetic levitation

Composition Dependence of Normal Spectral Emissivity of Liquid Ni–Al Alloys

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Normal spectral emissivity and heat capacity at constant pressure of Fe–Ni melts

Cited by 24 publications

References 16 publications

Thermophysical Properties of Molten Stainless Steel Containing 5 mass % B4C

Thermophysical Properties of Molten Stainless Steel Containing 5 mass % B4C

Study of solidification pathway of a MoSiBTiC alloy by optical thermal analysis and in-situ observation with electromagnetic levitation

Composition Dependence of Normal Spectral Emissivity of Liquid Ni–Al Alloys

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Thermophysical Properties of Molten Stainless Steel Containing 5 mass % B₄C

Thermophysical Properties of Molten Stainless Steel Containing 5 mass % B₄C