Study on the preparation of titanium nitride coating on oriented silicon steel surface

This experiment proposes a novel method for coating TiN on the surface of oriented silicon steel. Tetrabutyl titanate, 2,3-pyrazinedicarboxylic acid, and oxalic acid were used as raw materials to prepare a dry gel powder. The powder and silicon steel were subjected to heat treatment at 1000 °C in a flowing N2 atmosphere, resulting in the formation of a TiN coating on the silicon steel surface. Additionally, after calcination at this temperature, the dry gel powder is also converted into TiN with a purity of approximately 98.3%, allowing it to be recycled. The research results indicate that the obtained TiN coating is dense and free of cracks, with an average thickness of approximately 0.5 um. The coating adheres well to the substrate, achieving an ASTM adhesion grade of 5B. SEM and XRD analyses were used to investigate the formation mechanism of the TiN coating. During low-temperature pyrolysis of the dry gel, amorphous titanium oxide and amorphous carbon are formed. As the temperature increases, the amorphous titanium oxide crystallizes, while the amorphous carbon reacts with the silicon steel surface to form Fe3C. At the heat treatment temperature in the N2 atmosphere, Fe3C and TiO2 react to form the TiN coating.