Magnetic properties and applications of newly-developed Fe73.5Cu1Nb1.5V1.5Si13.5B9 alloy

The synthetical soft magnetic properties including d.c. and a.c. magnetic properties and pulse magnetic property are reported for a newly-developed nanocrystalline Fe73.5Cu1Nb1.5V1.5Si13.5B9 alloy. The new alloy possesses high d.c. relative initial permeability of 12.5x10(4) and low coercivity of 0.54 A/m. Under the conditions of B-m=0.3 T, f=100 kHz and B-m=0.2 T, f=200 kHz the core losses of the new alloy are 543 kW.m(-3) and 834 kW.m(-3), respectively, which can be comparable with those of nanocrystalline Fe73.5Cu1Nb3Si13.5B9 alloy. The analyses of core losses have been carried out in the wider range of f=20 similar to 10(4) kHz and B-m=0.0025 similar to 0.8 T and the approximate expression P(kW.m(-3))=1.803 B-m(2) f(1.77) has been obtained. The analyses of core losses in the range of f=20 similar to 10(4) kHz and B(m)f=(10 similar to 40) x 10(3)(T.Hz) have shown that the core loss and the corresponding amplitude permeability roughly vary as P=2.347x10(-6) (B(m)f)(1.97) f(-0.2231) and mu(a)=9.56x10(5) f-(0.7464), respectively, for the given product B(m)f. Some practical applications have also been mentioned.