公开(公告)号：EP0820534A1

公开(公告)日：1998-01-28

申请号：EP96912724.0

申请日：1996-04-12

Applicant: AlliedSignal Inc.

Inventor： HASEGAWA, Ryusuke ,  MARTIS, Ronald

IPC: C22C45 ,  G08B13 ,  H01F1

CPC classification number: G08B13/2408 ,  C22C45/00 ,  G08B13/2442 ,  H01F1/15308 ,  H01F1/15316 ,  H01F1/15341

Abstract: A glassy metal alloy consists essentially of the formula: FeaCobNicMdBeSifCg, where 'M' is at least one member selected form the group consisting of molybdenum, chromium and manganese, 'a-g' are in atom percent, 'a' ranges from about 30 to about 45, 'b' ranges form about 4 to about 40, 'c' ranges from about 5 to about 45, 'd' ranges from about 0 to about 3, 'e' ranges from about 10 to about 25, 'f' ranges from about 0 to about 15 and 'g' ranges from about 0 to about 2. The alloy can be cast by rapid solidification into ribbon, annealed to enhance magnetic properties, and formed into a marker that is especially suited for use in magneto-mechanically actuated articles surveillance systems. Advantageously, the marker is characterised by relatively linear magnetization response in the frequency regime wherein harmonic marker systems operate magnetically. Voltage amplitudes detected from the marker are high, and interference between surveillance systems based on mechanical resonance and harmonic re-radiance is virtually eliminated.

公开(公告)号：EP0574513B1

公开(公告)日：1996-04-17

申请号：EP92908179.2

申请日：1992-02-26

Applicant: AlliedSignal Inc.

Inventor： MARTIS, Ronald

IPC: H01F1/153

CPC classification number: H01F1/15341 ,  C22C45/008 ,  H01F1/15308 ,  H01F1/15333

Abstract: Fe-Ni based soft magnetic alloys having nanocrystalline particles substantially uniformly distributed throughout an amorphous matrix are disclosed. The soft magnetic alloys of the present invention may be represented by general formula: (FE1-xNix)aMb(B1-ySiy)c, where M is a metal chosen from the group consisting of Mo, Cr, Hf, Nb, Ta, Ti, V, W, Zr. The quantity 'x' is between about 0.2 and about 0.9; a is between about 60 and 90; b is between about 0.1 and 10; y is between 0 and 0.5; and c is between about 0.1 and about 30, with the stipulation that all the elements, plus impurities, add up to 100. Also described is a process for making the nanocrystalline alloys and for optimizing certain magnetic properties of said alloys via a two step anneal.