Glass film structure of grain-oriented silicon steel using aluminum nitride as an inhibitor

Fujii, Hiroyasu; Yamazaki, Shinsuke; Nagashima, T.; Kobayashi, Hisashi; Masui, Hiroaki; Shiozaki, M.

doi:10.1007/bf02645845

Cited by 14 publications

(2 citation statements)

References 9 publications

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“…The steel surface is coated with insulating forsterite (Mg 2 SiO 4 ), which is a reaction product of the subscales and magnesia (MgO) at a high temperature in the subsequent secondary recrystallization . The thickness and adhesion of the base coating are of great importance in order to obtain the electrical steel with good magnetic and surface properties . Therefore, it is necessary to control the structure of oxide layers during decarburization annealing for improvement of surface properties.…”

Section: Introductionmentioning

confidence: 99%

Characterization of chemical information and morphology for in‐depth oxide layers in decarburized electrical steel with glow discharge sputtering

Jung

Kwon

Kim

et al. 2013

Surface & Interface Analysis

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A combination of scanning electron microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, and transmission electron microscopy with a sampling method by glow discharge sputtering was successfully employed to characterize the chemical information and microscopic features of oxide layers formed during decarburization annealing of electrical steel in the depth direction at high resolution. The discontinuous surface oxides consisted of SiO 2 , (Fe,Mn)SiO 3 /(Fe,Mn) 2 SiO 4 , and FeO. SiO 2 embedded in the (Fe,Mn) 2 SiO 4 at the surface may be developed by the preferential nucleation and growth kinetics. The discrete or often relatively spherical oxides of internal oxidation by the energetically favorable surface effect were identified as a mixture of SiO 2 and (Fe,Mn) 2 SiO 4 at a depth of~0.5 mm from the surface. The oxides of networks and small particles at a depth greater than~1 mm were solely silica, of which the morphologies were possibly caused by the enhanced diffusion of oxygen atoms and Si atoms at grain boundaries or sub-grain boundaries. The equilibrium and kinetic considerations served by theoretical calculations were introduced to understand the formation and behavior of the observed in-depth oxidation. Figure 6. Spectral line fit of high-resolution spectra for (a) O 1s peak and (b) Si 2p peak after 120 s sputtering of as-received surface; (c) O 1s peak and (d) Si 2p peak after 120 s sputtering of the specific surface C in Fig. 5.

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Section: Introductionmentioning

confidence: 99%

Characterization of chemical information and morphology for in‐depth oxide layers in decarburized electrical steel with glow discharge sputtering

Jung

Kwon

Kim

et al. 2013

Surface & Interface Analysis

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“…First, on a morphology of spinel, spinel is protruded from the forsterite film into the matrix. 5 Second, on the distribution of the elements of Al in the glass film, Al is distributed far from the surface. These morphological shapes, element distributions, and the relationship between the amount of spinel and the amount of forsterite support the mechanism described above.…”

Section: Discussionmentioning

confidence: 99%

Structure and formation process of the glass film on grain-oriented silicon steel using aluminum nitride as an inhibitor

Fujii

Yamazaki

Masui

et al. 1999

Journal of Applied Physics

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Internal oxidation of Fe–3%Si alloys annealed under H₂O–H₂ atmosphere

Yamazaki

Takahashi

Kubota

et al. 2011

Materials & Corrosion

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Internal oxidation phenomena during decarburization annealing are very important in the manufacturing process of grain oriented electrical steel. In the present study, the internal oxidation of nearly pure Fe–3%Si alloy was investigated, as a basic study for decarburization annealing. Annealing was performed at various $P_{{\rm H}_{{\rm 2}} {\rm O}} /P_{{\rm H}_{{\rm 2}} } $ ratios and at 1123 K for 300 s. The transition of external to internal oxidation took place at $P_{{\rm H}_{{\rm 2}} {\rm O}} /P_{{\rm H}_{{\rm 2}} } $ around 0.01. The morphologies of oxide in the internal oxidation zone (IOZ) were filamentary or needle‐like shapes and different from the reported oxide shapes in industrial electrical steel. These peculiar morphologies affected the kinetic aspects such as the depth and the enrichment of oxide in the IOZ.

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Glass film structure of grain-oriented silicon steel using aluminum nitride as an inhibitor

Cited by 14 publications

References 9 publications

Characterization of chemical information and morphology for in‐depth oxide layers in decarburized electrical steel with glow discharge sputtering

Characterization of chemical information and morphology for in‐depth oxide layers in decarburized electrical steel with glow discharge sputtering

Structure and formation process of the glass film on grain-oriented silicon steel using aluminum nitride as an inhibitor

Internal oxidation of Fe–3%Si alloys annealed under H₂O–H₂ atmosphere

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Glass film structure of grain-oriented silicon steel using aluminum nitride as an inhibitor

Cited by 14 publications

References 9 publications

Characterization of chemical information and morphology for in‐depth oxide layers in decarburized electrical steel with glow discharge sputtering

Characterization of chemical information and morphology for in‐depth oxide layers in decarburized electrical steel with glow discharge sputtering

Structure and formation process of the glass film on grain-oriented silicon steel using aluminum nitride as an inhibitor

Internal oxidation of Fe–3%Si alloys annealed under H2O–H2 atmosphere

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Internal oxidation of Fe–3%Si alloys annealed under H₂O–H₂ atmosphere