US5207841A — Soft magnetic powder and magnetic shield composit…

Claim 1

Independent Claim 130 words

A soft magnetic powder for use in magnetic shield comprising flat soft magnetic particles of an alloy having a composition defined and encompassed by polygon ABCDE in a ternary composition diagram of Fe, Si, and Cr wherein points A, B, C, D, and E have the following compositions as expressed in atomic percentage A: Fe 78 Si 22 Cr 0 B: Fe 70 Si 30 Cr 0 C: Fe 60 Si 30 Cr 10 D: Fe 63 Si 18 Cr 19 E: Fe 76 Si 18 Cr 6 wherein said flat soft magnetic particles have a weight average particle diameter D 50 of 5 to 30 μm and an average thickness of up to 1 μm, the average particle diameter divided by the average thickness being from 10 to 3,000.

Claim 2

Dependent Claim 130 words

A soft magnetic powder for use in magnetic shield comprising flat soft magnetic particles of an alloy having a composition defined and encompassed by polygon ABCDE in a ternary composition diagram of Fe, Si, and Cr wherein points A, B, C, D, and E have the following compositions as expressed in atomic percentage A: Fe 78 Si 22 Cr 0 B: Fe 70 Si 30 Cr 0 C: Fe 60 Si 30 Cr 10 D: Fe 63 Si 18 Cr 19 E: Fe 76 Si 18 Cr 6 wherein said flat soft magnetic particles have a weight average particle diameter D 50 of 5 to 30 μm and an average thickness of up to 1 μm, the average particle diameter divided by the average thickness being from 10 to 3,000.

Claim 3

Dependent Claim 27 words

The soft magnetic powder of claim 1 wherein the flat soft magnetic particles show a peak corresponding to plane index (002) in an X-ray diffraction diagram thereof.

Claim 4

Dependent Claim 42 words

The soft magnetic powder of claim 2 wherein the flat soft magnetic particles meet P(002)/P(022)≧0.1% wherein P(002) is a peak height corresponding to plane index (002) and P(022) is a peak height corresponding to plane index (022) in the X-ray diffraction diagram.

Claim 5

Dependent Claim 17 words

The soft magnetic powder of claim 2 wherein said alloy has a negative saturation magnetostriction constant λs.

Claim 6

Dependent Claim 23 words

A magnetic shield composition comprising a soft magnetic powder as set forth in any one of claim 1 to 4 and a binder.

Claim 7

Dependent Claim 149 words

A soft magnetic powder for use in magnetic shields comprising flat soft magnetic particles of an ally having a composition defined and encompassed by polygon JKLMN in a ternary composition diagram of Fe, Si, and Al wherein points J, K, L, M, and N have the following compositions as expressed in atomic percentage: J: Fe 83 .8 Si 9 .2 Al 7 K: Fe 84 .7 Si 9 .3 Al 6 L: Fe 85 .6 Si 10 .4 Al 4 .0 M: Fe 84 .9 Si 11 .1 Al 4 .0 N: Fe 83 .2 Si 9 .8 Al 7 wherein the flat soft magnetic particles show a peak corresponding to plane index (002) in an X-ray diffraction diagram thereof and wherein said flat soft magnetic particles have a weight average particle diameter D 50 of 5 to 30 μm and an average thickness of up to 1 μm.

Claim 8

Dependent Claim 149 words

A soft magnetic powder for use in magnetic shields comprising flat soft magnetic particles of an ally having a composition defined and encompassed by polygon JKLMN in a ternary composition diagram of Fe, Si, and Al wherein points J, K, L, M, and N have the following compositions as expressed in atomic percentage: J: Fe 83 .8 Si 9 .2 Al 7 K: Fe 84 .7 Si 9 .3 Al 6 L: Fe 85 .6 Si 10 .4 Al 4 .0 M: Fe 84 .9 Si 11 .1 Al 4 .0 N: Fe 83 .2 Si 9 .8 Al 7 wherein the flat soft magnetic particles show a peak corresponding to plane index (002) in an X-ray diffraction diagram thereof and wherein said flat soft magnetic particles have a weight average particle diameter D 50 of 5 to 30 μm and an average thickness of up to 1 μm.

Claim 9

Dependent Claim 42 words

The soft magnetic powder of claim 6 wherein the flat soft magnetic particles meet P(002)/P(022)≧0.1% wherein P(002) is a peak height corresponding to plane index (002) and P(022) is a peak height corresponding to plane index (022) in the X-ray diffraction diagram.

Claim 10

Dependent Claim 20 words

The soft magnetic powder of claim 6 wherein said alloy has a saturation magnetostriction constant λs of at most zero.

Claim 11

Dependent Claim 36 words

The soft magnetic powder of claim 6 wherein said flat soft magnetic particles have an average particle diameter and an average thickness, the average particle diameter divided by the average thickness being from 10 to 3,000.

Claim 12

Dependent Claim 23 words

A magnetic shield composition comprising a soft magnetic powder as set forth in any one of claim 6 to 9 and a binder.

Claim 13

Dependent Claim 130 words

A soft magnetic powder for use in magnetic shields comprising flat soft magnetic particles of an alloy having a composition defined and encompassed by polygon FGHIE in a ternary composition diagram of Fe, Si, and Cr wherein points F, G, H, I, and E have the following composition as expressed in atomic percentage F: Fe 77 Si 20 Cr 3 G: Fe 71 Si 26 Cr 3 H: Fe 62 Si 26 Cr 12 I: Fe 70 Si 18 Cr 12 E: Fe 76 Si 18 Cr 6 wherein said flat soft magnetic particles have a weight average particle diameter D 50 of 5 to 30 μm and an average thickness of up to 1 μm, the average particle diameter divided by the average thickness being from 10 to 3,000.

Claim 14

Dependent Claim 130 words

A soft magnetic powder for use in magnetic shields comprising flat soft magnetic particles of an alloy having a composition defined and encompassed by polygon FGHIE in a ternary composition diagram of Fe, Si, and Cr wherein points F, G, H, I, and E have the following composition as expressed in atomic percentage F: Fe 77 Si 20 Cr 3 G: Fe 71 Si 26 Cr 3 H: Fe 62 Si 26 Cr 12 I: Fe 70 Si 18 Cr 12 E: Fe 76 Si 18 Cr 6 wherein said flat soft magnetic particles have a weight average particle diameter D 50 of 5 to 30 μm and an average thickness of up to 1 μm, the average particle diameter divided by the average thickness being from 10 to 3,000.

Claim 15

Dependent Claim 150 words

A soft magnetic powder for use in magnetic shields comprising flat soft magnetic particles of an alloy having a composition defined and encompassed by polygon JKLQR in a ternary composition diagram of Fe, Si, and Al wherein points j, K, L, Q, and R have the following compositions as expressed in atomic percentage: J: Fe 83 .8 Si 9 .2 Al 7 K: Fe 84 .7 Si 9 .3 Al 6 L: Fe 85 .6 Si 10 .4 Al 4 .0 Q: Fe 85 .1 Si 10 .9 Al 4 .0 R: Fe 83 .5 Si 9 .5 Al 7 .0 wherein the flat soft magnetic particles show a peak corresponding to plane index (002) in an X-ray diffraction diagram thereof and wherein said flat soft magnetic particles have a weight average particle diameter D 50 of 5 to 30 μm and an average thickness of up to 1 μm.

Claim 16

Dependent Claim 150 words

A soft magnetic powder for use in magnetic shields comprising flat soft magnetic particles of an alloy having a composition defined and encompassed by polygon JKLQR in a ternary composition diagram of Fe, Si, and Al wherein points j, K, L, Q, and R have the following compositions as expressed in atomic percentage: J: Fe 83 .8 Si 9 .2 Al 7 K: Fe 84 .7 Si 9 .3 Al 6 L: Fe 85 .6 Si 10 .4 Al 4 .0 Q: Fe 85 .1 Si 10 .9 Al 4 .0 R: Fe 83 .5 Si 9 .5 Al 7 .0 wherein the flat soft magnetic particles show a peak corresponding to plane index (002) in an X-ray diffraction diagram thereof and wherein said flat soft magnetic particles have a weight average particle diameter D 50 of 5 to 30 μm and an average thickness of up to 1 μm.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1996-05-03	1996-11-02	1997-05-04	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2000-05-03	2000-11-02	2001-05-04	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2004-05-03	2004-11-02	2005-05-04	$7700.00	Window Closed / Lapsed

Soft magnetic powder and magnetic shield composition

Abstract

Inventors

Bibliographic Details

Claims Analysis

References Cited (Backward Citations)

USPTO Annuity & Maintenance Windows

Assigned Categories & Tags

Assign Category Tag