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US 4,923,533 AGranted
Magnetic shield-forming magnetically soft powder, composition thereof, and process of making
AssigneesTDK Corporation, Tokyo Magnetic Printing Co., Ltd.
InventorsMasao Shigeta, Tsutomu Choh, Hiroyoshi Shimizu, Ippo Hirai, Shohei Mimura, Atsushi Makimura, Hiroshi Hosaka
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Abstract
A powder comprising flakes of magnetically soft amorphous alloy having an average thickness of 0.01-1 .mu.m and an aspect ratio of 10-10,000 is blended with a binder to form a coating composition from which a magnetic shield is fabricated. The alloy is basically an Fe-B-Si ternary alloy in which iron may be partially replaced by another metal.
Claims35
A powder suitable for forming a magnetic shield, comprising:
- flakes of magnetically soft amorphous alloy having an average thickness of from about 0.01 to about 1 .mu.m and an aspect ratio, defined as average outer diameter divided by average thickness of from about 10 to about 10,000, said soft amorphous alloy being an alloy of a ternary composition having the formula:
- Fe.sub.u M.sub.v (Si,B).sub.w
- wherein M is at least one metal selected from the group consisting of Cr, Nb, Ti, V, Ta, Mo, W, Mn, Co, and Ni;
- u, v and w are the atom percentages of Fe, M and Si+B, respectively, and are v=0 to 10, w=15 to 38 and u=100-v-w.
1 more element
A magnetically shielding composition, comprising:
- a powder of flakes of magnetically soft amorphous alloy with the flakes having an average thickness ranging from about 0.01 to about 1 .mu.m and an aspect ratio, defined as average outer diameter divided by average thickness, of from about 10 to about 10,000, said soft amorphous alloy being of a ternary composition of the formula:
- Fe.sub.u M.sub.v (Si,B).sub.w
- wherein M is at least one metal selected from the group consisting of Cr, Nb, Ti, V, Ta, Mo, W, Mn, Co, and Ni;
- u, v and w are the atom percentages of Fe, M and Si+B, respectively, and are v=0 to 10, w=15 to 38 and u=100-v-w;
- and
- a binder.
3 more elements
Dependencies are inferred from the claim text.