Influence of MgO containing strontium on the structure of ceramic film formed on grain oriented silicon steel surface

• Main Authors: Daniela C. Leite Vasconcelos, Maria das Graças M.M. Cesar, Marco Antônio da Cunha, Wander L. Vasconcelos
• Format: Article
• Language: English
• Published: Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol) 1999-07-01
• Series: Materials Research
• Subjects: ceramic film; forsterite particles; grain oriented silicon steel; magnetic core loss
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14391999000300008

The oxide layer formed on the surface of a grain oriented silicon steel was characterized by SEM and EDS. 3% Si steel substrates were coated by two types of slurries: one formed by MgO and water and other formed by MgO, water and SrSO4. The ceramic films were evaluated by SEM, EDS and X-ray diffraction. Depth profiles of Fe, Si and Mg were obtained by GDS. The magnetic core losses (at 1.7 Tesla, 60 Hz) of the coated steel samples were evaluated as well. The use of MgO containing strontium reduced the volume fraction of forsterite particles beneath the outermost ceramic layer. It was observed a reduced magnetic core loss with the use of the slurry with MgO containing strontium.