Glass Film Formation on GOES Surface during High-Temperature Annealing: The Mechanism with Amorphous Phase Formation

Mikhail L Lobanov; Nikolai N Nikul'chenkov; Vladimir V Popov; Artem S Yurovskikh; Mikhail Yu Veksler; Vladimir I Pastukhov

doi:10.3390/nano12234150

Glass Film Formation on GOES Surface during High-Temperature Annealing: The Mechanism with Amorphous Phase Formation

Nanomaterials (Basel). 2022 Nov 23;12(23):4150. doi: 10.3390/nano12234150.

Authors

Mikhail L Lobanov¹, Nikolai N Nikul'chenkov¹, Vladimir V Popov^{1

2}, Artem S Yurovskikh¹, Mikhail Yu Veksler¹, Vladimir I Pastukhov^{1

3}

Affiliations

¹ Heat Treatment & Physics of Metals Department, Ural Federal University, 19 Mira St., 620062 Ekaterinburg, Russia.
² Department of Materials and Engineering, Tel Aviv University, Ramat Aviv, Tel Aviv 6997801, Israel.
³ Institute of Nuclear Materials, Sverdlovsk Region, 624250 Zarechny, Russia.

Abstract

Ceramic insulation coating (glass film) is an important constituent of grain-oriented electrical steel (GOES) designed for use in transformers. Within the scope of this study, the glass film was obtained by means of interaction between the surface of GOES containing 0.5 wt. % Cu and a heat-resistant MgO coating during annealing up to 1100 °C in the 75%H₂ + 25%N₂ atmosphere. The structure of glass film was analyzed using X-ray diffraction, glow-discharge optical emission spectroscopy, scanning probe microscopy, scanning electron microscopy, differential scanning calorimetry and thermodynamic calculations. After annealing, the glass film contained the following phases: crystalline (MgFe)₂SiO₄ and amorphous Fe-based solid solutions. The multi-stage mechanism of the glass film formation on GOES surface during high-temperature annealing was determined.

Keywords: GOES; X-ray diffraction; amorphous phase; coating; forsterite; glass film.

Grants and funding

This research was funded by the Ministry of Science and Higher Education of the Russian Federation (Ural Federal University Program of Development within the Priority-2030 Program).