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| Study on the Fracture Properties of Fe-based Soft Magnetic Composites |
| XIAO Ling1, LEI Zhongqi1, CHENG Wenjie1, LI Ming1, FAN Hongwei1, LIU Gang1, SUN Yanhua2, YU Lie2
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1 Department of Basic Courses, Xi’an University of Science and Technology, Xi’an 710054;
2 State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi’an Jiaotong University, Xi’an 710049 |
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Abstract The soft magnetic composites (SMCs) with higher flexural strength were prepared successfully by two-step heat treatment method and the relationship between the microstructure and flexural strength was investigated. The strength achieves the better value 45.3 MPa for the increase of the binding bonds between passivated iron powders and organosilicon epoxy resin (OER) with excellent dielectric properties. Energy dispersion spectrum (EDS) and finite element method (FEM) results showed that the pores and cracks produced during the SMCs preparation process were mainly distributed in the resin layer and resin-Fe interface. Under the external load, the stress distribution of the pore edge was affected by the crack, and made them expand toward the same fai-lure direction, resulting in a negative effect on the strength of SMCs. Our work suggests that the improve of the SMCs′ strength depends on the integrity of the coating resin, the further enhancement of resin/iron adhesive strength and resin layer′s strength, as well as the use of hot pressing to reduce pores.
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Published: 25 June 2017
Online: 2018-05-08
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2017, Vol. 31 
