Scanning Electron Microscopy-Cathodoluminescence Imaging of Industrial Steelmaking Slag for Identifying and Determining the Free Magnesia Content

Imashuku, Susumu; Wagatsuma, Kazuaki

doi:10.1007/s11663-022-02609-z

Cited by 8 publications

(3 citation statements)

References 43 publications

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“…The CL spectra of the surfaces of the Cr 2 O 3 lm-deposited sapphires and the heat-treated Ni-25Cr-5Al alloys were acquired using the custom SEM-CL system previously described by the author [15,16,18,21,[26][27][28][29][30][31]. In brief, the CL spectra were acquired using an optical spectrometer (QE65Pro, Ocean Optics Inc., Largo, Florida, USA) by connecting an optical ber with a plano-convex lens at its tip opposite to that connected to the optical spectrometer.…”

Section: Methodsmentioning

confidence: 99%

Determination of the maximum surface chromia thickness for the nondestructive identification of internal alumina scales on a heat-resistant alloy using cathodoluminescence

Imashuku

2023

Preprint

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To develop a nondestructive analytical method for identifying internal α-Al2O3 scales formed in heat-resistant alloys, the maximum thickness of surface Cr2O3 scales for identifying internal α-Al2O3 scales via cathodoluminescence (CL) spectroscopy was estimated using CL-peak intensity at 695 nm for Cr2O3 film-deposited sapphires and α-Al2O3 scales formed on the surface of Fe-Cr-Al alloys. The estimated maximum Cr2O3 thickness was validated by measuring the CL peak intensities of Ni-25Cr-5Al alloys heated at 1000°C under oxygen. Therefore, internal α-Al2O3 scales can be identified nondestructively by acquiring the surface CL spectra up to ~ 3-µm surface Cr2O3 thickness.

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Section: Methodsmentioning

confidence: 99%

Determination of the maximum surface chromia thickness for the nondestructive identification of internal alumina scales on a heat-resistant alloy using cathodoluminescence

Imashuku

2023

Preprint

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“…The surface CL spectra of the NiO and NiAl 2 O 4 filmdeposited sapphire substrates and heat-treated Ni-14Al and Ni-18Al alloys were acquired using the custom SEM-CL system previously described by the author's group. 16,[35][36][37][38][39] Briefly, the CL spectra were acquired using an optical spectrometer (QE65Pro, Ocean Optics Inc., Largo, Florida, USA). An optical fiber with a plano-convex lens at its tip was connected on the opposite end to the optical spectrometer.…”

Section: Methodsmentioning

confidence: 99%

Nondestructive Identification of Internal <i>α</i>-alumina Scales on Heat-resistant Ni–Al Alloys Based on Cathodoluminescence Spectra

Imashuku

2023

ISIJ Int.

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Identifying internal α-alumina (α-Al 2 O 3 ) scales is critical for evaluating the performance of heat-resistant Ni-Al alloys. This study investigated the possibility of using cathodoluminescence (CL) spectra of the alloy surface for nondestructive identification of internal α-Al 2 O 3 scales underneath multiple other scales. The presence of internal α-Al 2 O 3 scales on a heat-treated Ni-14Al alloy was confirmed by the detection of a CL peak at 695 nm. The scales of this alloy comprised NiO on top followed by NiAl 2 O 4 underneath and α-Al 2 O 3 at the bottom with thicknesses of 1.1, 0.8, and 0.5 μm, respectively. The intensity of the CL peak at 695 nm was close to the minimum detectable analyte signal intensity. These results demonstrate that surface CL spectra can be used for the nondestructive identification of internal α-Al 2 O 3 scales on Ni-Al alloys that are underneath multiple other scales.

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“…Magnesium slag mainly contains CaO, SiO 2 and MgO. Due to its high MgO content, expansion behavior occurs during the hydration process [15][16][17], and for that reason, magnesium slag is not yet used on a large scale in the construction industry. Ji et al [18] discussed the potential of magnesium slag as a mineral admixture and found that when 30% of magnesium slag was used as a replacement for Portland cement, this was beneficial to improve the late strength of concrete and reduce drying shrinkage.…”

Section: Introductionmentioning

confidence: 99%

Structural Characteristics and Cementitious Behavior of Magnesium Slag in Comparison with Granulated Blast Furnace Slag

Lu,

Zhao,

Zhang

et al. 2024

Materials

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Magnesium slag is a type of industrial solid waste produced during the production of magnesium metal. In order to gain a deeper understanding of the structure of magnesium slag, the composition and microstructure of magnesium slag were investigated by using characterization methods such as X-ray fluorescence, particle size analysis, X-ray diffraction, Fourier transform infrared spectroscopy and scanning electron microscopy. In addition, the state of Si occurrence in magnesium slag was analyzed using a solid-state nuclear magnetic resonance technique in comparison with granulated blast furnace slag. An inductively coupled plasma-optical emission spectrometer and scanning electron microscope with energy dispersive X-ray spectroscopy were used to characterize their cementitious behavior. The results show that the chemical composition of magnesium slag mainly includes 54.71% CaO, 28.66% SiO2 and 11.82% MgO, and the content of Al2O3 is much lower than that of granulated blast furnace slag. Compared to granulated blast furnace slag, magnesium slag has a larger relative bridging oxygen number and higher [SiO4] polymerization degree. The cementitious activity of magnesium slag is lower compared to that of granulated blast furnace slag, but it can replace part of the cement to obtain higher compressive strength. Maximum compressive strength can be obtained when the amount of magnesium slag replacing cement is 20%, where the 28-day compressive strength can be up to 45.48 MPa. This work provides a relatively comprehensive analysis of the structural characteristics and cementitious behavior of magnesium slag, which is conducive to the promotion of magnesium slag utilization.

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Scanning Electron Microscopy-Cathodoluminescence Imaging of Industrial Steelmaking Slag for Identifying and Determining the Free Magnesia Content

Cited by 8 publications

References 43 publications

Determination of the maximum surface chromia thickness for the nondestructive identification of internal alumina scales on a heat-resistant alloy using cathodoluminescence

Determination of the maximum surface chromia thickness for the nondestructive identification of internal alumina scales on a heat-resistant alloy using cathodoluminescence

Nondestructive Identification of Internal <i>α</i>-alumina Scales on Heat-resistant Ni–Al Alloys Based on Cathodoluminescence Spectra

Structural Characteristics and Cementitious Behavior of Magnesium Slag in Comparison with Granulated Blast Furnace Slag

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