Production of Fe-6.9 wt%Ti alloy sheets for application in electric machines: Physical properties characterization

Autor(es)

Fulop, G. O. ^[1] ; Bormio-Nunes, C. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Lorena Sch Engn, BR-12602810 Lorena - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Magnetism and Magnetic Materials; v. 539, DEC 1 2021.
• Citações Web of Science: 0

Resumo

Early structural damage and resulting failures can be caused by vibration in AC electrical machines. Since the stator is under a magnetic field that varies with time, the stator magnetic material contracts and expands due to the magnetostriction, producing noise and vibration. Therefore, a low magnetostriction value is desirable to minimize the effect of vibration and avoid earlier motor breakdowns. However, not only a low magnetostriction value is enough. Low values of magnetic losses avoid the material heating, consequently preventing magnetic properties degradation. To minimize these magnetic losses, a suitable material might have high resistivity and magnetic permeability, and also low coercive field. Fe-Ti alloys have low magnetostriction values and are soft magnetic material, making them good candidates for using in motors' stators. In the present work, two Fe-Ti alloys with composition 6.9 wt% Ti (8 at.%) were studied. One of the alloys was studied after the as cast ingot annealing at 1200 degrees C. The other alloy was hot rolled from 7 mm down to 0.5 mm of thickness. The maximum magnetic induction of the rolled alloy was 1.74 T, about 12% higher than the not rolled one. In addition, the rolled Fe-Ti alloy magnetostriction is lower than 1 ppm up to 1.25 T, while in the not rolled condition is also 1 ppm, but only up to 0.75 T. (AU)

• Processo FAPESP: 17/26386-3 - Obtenção de Ligas de Alta Entropia a base de Fe, Co e Ni e Estudo das suas Propriedades Magnéticas
• Beneficiário: Cristina Bormio Nunes
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 18/14939-0 - Produção de chapas de ligas de Fe-Ti e aperfeiçoamento de suas propriedades magnéticas e microestruturais para utilização em máquinas elétricas e transformadores de baixo ruído
• Beneficiário: Guilherme Origo Fulop
• Modalidade de apoio: Bolsas no Brasil - Doutorado