Patent ID: 8048191

Claim:
A compound powder for making magnetic powder cores comprising a mixture of powder A and powder B, the content of powder A is 50-96 wt % and the balance is powder B; powder A is Fe-based nanocrystalline powder, powder B is Fe-based amorphous powder with electrical insulating properties; wherein: the composition of said powder B satisfies (Fe 1-x M x ) 100-a-b-c P a T b D c ; wherein M represents at least one element of Co and Ni; T consists of Al, C, B, Si; D is at least one element selected from Sn, Cr, Mn, Mo, W, V, Nb, Ta, Ti, Zr, Hf, Pt, Pd, Au; x is from 0.01 to 0.16; a is from 8 to 15; b is from 10 to 25; c is from 0.5 to 6, and all by atomic percentage; said amorphous powder B is oxidated on its surface and the oxygen content is 4000-20000 ppm; said powder A is crushed nanocrystalline strip.