Soft Magnetic Properties of Tin-added Fe-Based Amorphous Alloys with Large Supercooled Liquid Region

• Main Authors: Chao Chih-Kang, 趙志剛
• Other Authors: Chin Tsung-Shune
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/55112903529877195312

碩士 === 國立清華大學 === 材料科學工程學系 === 89 === Abstract Fe80-xSnxP12B4Si4 (x=1~8at%) and Fe78-yAlySn2P12B4Si4 (y=3~5at%) alloys were prepared by melt-spinning method. By the dissolution of Sn atom, the supercooled liquid region, ?Tx(= Tx－Tg), was enlarged and the largest value is 46.6K for Fe74Sn6P12B4Si4 alloy and 50.2K for Fe74Al4Sn2P12B4Si4 alloy by the analysis of DSC, where the crystallization takes place through a single stage exothermic reaction. The effectiveness of Sn atom addition is interpreted to result from the formation of a high degree of dense random packed structure by dissolving the Sn element with larger atomic size. The Fe74Sn6P12B4Si4 amorphous alloy exhibiting the largest ?Tx crystallized due to the precipitation of crystalline phasesα-Fe, FeP, Fe3P, Fe3B and FeSn. The long range atomic rearrangement necessary for the nearly simultaneous precipitation of the five crystalline phases seems to cause the appearance of the supercooled liquid region through the retardation of the precipitation reaction. The soft magnetic properties of Fe80-xSnxP12B4Si4 (x=1~6 at%) amorphous ribbon annealed state at 723K for 600s are 1.328T to 1.114T for saturation magnetization (Bs), 2.867 to 7.867A/m for coercive force (Hc), 134108 to 48671 for maximum permeability (μm), 593 to 600.5K for the Curie temperature (Tc), 0.071 to 0.2 W/kg for core loss at 50 Hz in 1 T external magnetic field. The resistivity (ρ) is from 154.44 to 187.68 μΩ-cm. The soft magnetic properties of Fe78-yAlySn2P12B4Si4 (y=3~5 at%) amorphous ribbon annealed state at 723K for 600s are 1.22T to 1.079T for saturation magnetization (Bs), 2.204 to 3.449A/m for coercive force (Hc), 136645 to 208466 for maximum permeability (μm), 591.1 to 578.3K for the Curie temperature (Tc), 0.143 to 0.161 W/kg for core loss at 50 Hz in 1.1 T extra magnetic field. The resistivity (ρ) is from 175.39 to 188 μΩ-cm. The Fe80-xSnxP12B4Si4 and Fe78-yAlySn2P12B4Si4 amorphous alloys exhibit good soft magnetic properties and the wide supercooled liquid region are important for future development of a new type of soft magnetic material for distribution transformers..