Effects of Annealing of Gas-atomized Fe-Si-Cr Powder

Fe-Si-Cr 분말합금의 열처리 효과

Jang, Pyungwoo

  • Received : 2015.12.21
  • Accepted : 2016.02.11
  • Published : 2016.02.29


Effects of annealing of the gas-atomized Fe-9%Si-2%Cr powder which is suitable for high frequency application in mobile devices because of its high electrical resistivity were studied with an emphasis on the order-disorder phase transition. The formation of B2 ordered phase could not be suppressed during atomization process. When the powder was annealed at a temperature higher than $550^{\circ}C$ the peak diffracted from $DO_3$ phase could be detected. With increasing annealing temperature lattice parameter and coercivity decreased. An interesting phenomenon was an abrupt increment of coercivity in the powder annealed at $450^{\circ}C$. Highest permeability could be shown in the powder annealed at a relative low temperature of $150^{\circ}C$ and then the permeability decreased with annealing temperature. The above-mentioned results could be successfully explained by both the formation of $DO_3$ ordered phases and the change of electrical resistivity of the Fe-Si-Cr powder which was also originated from the phase transition.


Fe-Si-Cr powder;$DO_3$ phase;B2 phase;annealing;electrical resistivity;permeability


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Supported by : 청주대학교 산업과학연구소