| The magnetic properties of Fe-30%Cr-25%Co alloys as a function of the additional rare earth metals were studied. A mumber of ingots for specimen containing 1 w/o to 2 w/o Y and Sm were prepared by arc melting under a protective atmosphere, resulting in a rapid freezing from the molten state. The samples were then annealed for various time at the temperature between 500℃ and 700℃. It was founded that the magnetic properties of Fe-Cr-Co-R(R: rare earth metals) alloys were superior to Fe-Cr-Co alloys, and the maximum energy product 2-3.5 MGOe were obtained by aging treatment with the aging time 16-32 hours and the aging temperature 500℃-600℃. It is concluded that a small amount of Y and Sm, especially Sm metals, remarkably increases the coercive force of Fe-Cr-Co magnet alloys, which may be attributed to the certain modification of their modulated structure or the precipitation of ferromagnetic phase such as RCo_5 and R₂Co_(17) in the matrix, due to rare earth metals. |
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