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[2, 2007] 

Journal of Electrical Engineering, Vol 58, 2 (2007) 118-120

(FeSm - FeAlGa COMPOSITES PREPARED BY HOT-PRESSING OF BALL MILLED POWDERS

Jarmila Degmová - Jörg Finnberg - Stefan Roth

   The present study was aimed to prepare a material which combines a high magnetostrictive strain in low magnetic fields with a high mechanical strength. Therefore we prepared composites which consist of soft magnetic Fe77Al2.4P8.64C5B4Si2.6Ga0.8 and high magnetostrictive Fe2Sm alloys. Ball milling of the amorphous FeAlPCBSiGa ribbon and a crystalline FeS ingot and subsequent hot pressing of the resulting powders were used to prepare disc shaped composites. A maximum magnetostrictive susceptibility of 930 ppm/T at a field of μ0H = 0.1 T was obtained. The hardness varied from 150 HV10 to 340 HV10 with increasing amount of the amorphous phase.

Keywords: high magnetostrictive material, soft magnetic material, magnetostrictive strain, ball-milling, hot pressing


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