Claims
- 1. A method of producing a wound magnetic core constituted by (a) a thin ribbon made of a fine crystalline, soft magnetic Fe-base alloy having the composition represented by the general formula:
- (Fe.sub.1-a M.sub.a).sub.100-x-y-z-.alpha. Cu.sub.x Si.sub.y B.sub.z M'.sub..alpha.
- wherein M is Co and/or Ni, M' is at least one element selected from the group consisting of Nb, W, Ta, Zr, Hf, Ti and Mo, and a, x, y, z and .alpha. respectively satisfy 0.ltoreq.a.ltoreq.0.5, 0.1.ltoreq.x.ltoreq.3, 0.ltoreq.y.ltoreq.30, 0.ltoreq.z.ltoreq.25, 5.ltoreq.y+z.ltoreq.30 and 0.1.ltoreq..alpha..ltoreq.30, at least 50% of the alloy structure being occupied by fine crystal grains having an average grain size of 1000 .ANG. or less; and (b) a heat-resistant insulating layer formed on at least one surface of said thin ribbon, comprising the steps of:
- (a) applying to at least one surface of a thin ribbon made of an amorphous alloy having the same composition as above a dispersion containing 20-90 weight %, as SiO.sub.2, of a silanol oligomer and 80-10 weight % of fine ceramic particles based on a solid component, in a thickness of 0.5-5 .mu.m on a dry basis;
- (b) winding said thin ribbon after drying; and
- (c) subjecting the resulting wound magnetic core to a heat treatment at 450.degree.-700.degree. C. for 5 minutes-24 hours to finely crystallize said amorphous alloy and to cause the cross-linking of said silanol oligomer.
- 2. The method according to claim 1, wherein said silanol oligomer is a polymer of a hydrolyzate of a silicon alkoxide substantially having the structure represented by RSi(OR).sub.3, said silanol oligomer having an average molecular weight of 500-8000.
- 3. The method according to claim 1, wherein said fine ceramic particles are ceramic colloidal particles.
- 4. The method according to claim 3, wherein said ceramic colloidal particles are colloidal silica.
- 5. A method of producing a wound magnetic core constituted by (a) a thin ribbon made of a fine crystalline, soft magnetic Fe-base alloy having the composition represented by the general formula:
- (Fe.sub.1-a M.sub.a).sub.100-x-y-z-.alpha.-.beta.-.gamma. Cu.sub.x Si.sub.y B.sub.z M'.sub..alpha. M".sub..beta. X.sub..gamma.
- wherein M is Co and/or Ni, M' is at least one element selected from the group consisting of Nb, W, Ta, Zr, Hf, Ti and Mo, M" is at least one element selected from the group consisting of V, Cr, Mn, Al, elements in the platinum group, Sc, Y, rare earth elements, Au, Zn, Sn and Re, X is at least one element selected from the group consisting of C, Ge, P, Ga, Sb, In, Be and As, and a, x, y, z, .alpha., .beta. and .gamma. respectively satisfy 0.ltoreq.a.ltoreq.0.5, 0.1.ltoreq.x.ltoreq.3, 0.ltoreq.y.ltoreq.30, 0.ltoreq.z.ltoreq.25, 5.ltoreq.y+z.ltoreq.30, 0.1.ltoreq..alpha..ltoreq.30, .beta..ltoreq.10 and .gamma..ltoreq.10, at least 50% of the alloy structure being occupied by fine crystal grains having an average grain size of 1000 .ANG. or less; and (b) a heat-resistant insulating layer formed on at least one surface of said thin ribbon, comprising the steps of:
- (a) applying to at least one surface of a thin ribbon made of an amorphous alloy having the same composition as above a dispersion containing 20-90 weight %, as SiO.sub.2, of a silanol oligomer and 80-10 weight % of fine ceramic particles based on a solid component, in a thickness of 0.5-5 .mu.m on a dry basis;
- (b) winding said thin ribbon after drying; and
- (c) subjecting the resulting wound magnetic core to a heat treatment at 450.degree.-700.degree. C. for 5 minutes-24 hours to finely crystallize said amorphous alloy and to cause the cross-linking of said silanol oligomer.
- 6. The method according to claim 5, wherein said silanol oligomer is a polymer of a hydrolyzate of a silicon alkoxide substantially having the structure represented by RSi(OR).sub.3, said silanol oligomer having an average molecular weight of 500-8000.
- 7. The method according to claim 5, wherein said fine ceramic particles are ceramic colloidal particles.
- 8. The method according to claim 7, wherein said ceramic colloidal particles are colloidal silica.
Priority Claims (1)
Number |
Date |
Country |
Kind |
1-22606 |
Feb 1989 |
JPX |
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Parent Case Info
This is a division of application Ser. No. 07/473,476, filed Feb. 1, 1990.
Foreign Referenced Citations (1)
Number |
Date |
Country |
271657 |
Jun 1988 |
EPX |
Non-Patent Literature Citations (4)
Entry |
63-110607 05001988 JPX |
63-229786 09001988 JPX |
63-302504 12001988 JPX |
64-42230 02001989 JPX |
Divisions (1)
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Number |
Date |
Country |
Parent |
473476 |
Feb 1990 |
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