| Abstract |
| The work was made to investigate how the amount of glass particles affected the microstructure and magnetic properties of Fe-6.5 wt%Si alloy subjected to metal injection molding (MIM) technique. The high-temperature sintering treatments at 1350 ℃ for 2 hrs were carried out on the present samples containing various glass particle contents, such as 0, 1, 2, and 3 wt%. Microstructural observations revealed that the ferrite grain size of the sample without glass particle was much larger than those with glass particle. This was attributed to the uniform incorporation of glass particles which inhibited the grain growth of the ferrite phase during sintering. Moreover, both the size and fraction of the micro pores present in the sintered microstructures were increased by the addition of glass particles which was dissolved completely due to lower melting temperature of glass particles (~800 ℃) than the sintering temperature (1350 ℃). As the amount of glass particle increased up to 2 wt%, the eddy current loss decreased considerably while the hysteresis loss increased slightly after sintering, causing the reduction in the total magnetic loss of the present sample. It is also observed that the appreciable amount of glass particle appeared to be segregated locally within the micro pores when the amount of glass particle exceeded 2 wt%. Consequently, the glass content of 2 wt% would be most beneficial for enhancing the magnetic properties of Fe-6.5 wt%Si alloy sample via MIM. (Received May 13, 2014) |
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| Key Words |
| magnetic materials, sintering, magnetic properties, scanning electron microscopy, metal injection molding |
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