Nanocrystalline magnetic alloy and method of heat-treatment thereof
AssigneesMetglas, Inc., Hitachi Metals, Ltd.
InventorsMotoki Ohta, Naoki Ito
Life of this patent
Estimating the term…
Abstract
A nanocrystalline alloy ribbon has an alloy composition represented by FebalCuxBySizAaXb where 0.6≤x<1.2, 10≤y≤20, 0<z≥10, 10(y+z)24, 0≤a≤10, O≤b≤5, with the balance being Fe and incidental impurities, where A is an optional inclusion of at least one element selected from Ni, Mn, Co, V, Cr, Ti, Zr, Nb, Mo, Hf, Ta and W, and X is an optional inclusion of at least one element selected from Re, Y, Zn, As, In, Sn, and rare earth elements, all numbers being in atomic percent. The ribbon has a local structure having nanocrystals with average particle sizes of less than 40 nm dispersed in an amorphous matrix, the nanocrystals occupying more than 30 volume percent of the ribbon and has a radius of ribbon curvature of at least 200 mm.
Claims24
A nanocrystalline alloy ribbon comprising:
- an alloy composition represented by Febal, CuxBySizAaXb where 0.6 at %≤x<1.2 at %, 10 at %≤y≤20 at %, 0 at %<z≤10 at %, 10 at %<(y+z)≤24 at %, 0 at %≤a≤10 at %, 0 at %≤b≤5 at %, with or without incidental impurities, where A is an optional inclusion of at least one element selected from Ni, Mn, Co, V, Cr, Ti, Zr, Nb, Mo, Hf, Ta and W, and X is an optional inclusion of at least one element selected from Re, Y, Zn, As, In, Sn, and rare earth elements, at. % being in atomic percent, wherein a total content of Ti, Mo, Nb, Zr, Ta, Hf, and Win the alloy composition is below 0.3 atomic percent;
- the nanocrystalline alloy ribbon having a heat-treated local structure including nanocrystals with average particle sizes of less than 40 nm dispersed in an amorphous matrix of the nanocrystalline alloy ribbon and occupying more than 30 volume percent of the nanocrystalline alloy ribbon,
- the nanocrystalline alloy ribbon exhibiting, based on the heat-treated local structure,
- a radius of ribbon curvature of at least 200 mm,
- a magnetic induction at 80 A/m exceeding 1.6 T and below 1.75 T,
- a coercivity Hc of less than 6.5 A/m, and
- a core loss at 1.5 T and 50 Hz of less than 0.27 W/kg.
A nanocrystalline alloy ribbon comprising:
- an alloy composition represented by Febal, CuxBySizAaXb where 0.6 at %≤x<1.2 at %, 10 at %≤y≤20 at %, 0 at %<z≤10 at %, 10 at %<(y+z)≤24 at %, 0 at %≤a≤10 at %, 0 at %≤b≤5 at %, with or without incidental impurities, where A is an optional inclusion of at least one element selected from Ni, Mn, Co, V, Cr, Ti, Zr, Nb, Mo, Hf, Ta and W, and X is an optional inclusion of at least one element selected from Re, Y, Zn, As, In, Sn, and rare earth elements, at. % being in atomic percent, wherein a total content of Ti, Mo, Nb, Zr, Ta, Hf, and Win the alloy composition is below 0.3 atomic percent;
- the nanocrystalline alloy ribbon having a heat-treated local structure including nanocrystals with average particle sizes of less than 40 nm dispersed in an amorphous matrix of the nanocrystalline alloy ribbon and occupying more than 30 volume percent of the nanocrystalline alloy ribbon, based on heat-treatment of the nanocrystalline alloy ribbon at an average heating rate of more than 50° C./sec. from at least room temperature,
- wherein the nanocrystalline alloy ribbon exhibits, based on the heat-treated local structure, a magnetic induction at 80 A/m exceeding 1.6 T and below 1.75 T.
A nanocrystalline alloy ribbon comprising:
- an alloy composition represented by Febal, CuxBySizAaXb where 0.6 at %≤x<1.2 at %, 10 at %≤y≤20 at %, 0 at %<z≤10 at %, 10 at %<(y+z)≤24 at %, 0 at %≤a≤10 at %, 0 at %≤b≤5 at %, with or without incidental impurities, where A is an optional inclusion of at least one element selected from Ni, Mn, Co, V, Cr, Ti, Zr, Nb, Mo, Hf, Ta and W, and X is an optional inclusion of at least one element selected from Re, Y, Zn, As and In, and rare earth elements, at. % being in atomic percent, wherein a total content of Ti, Mo, Nb, Zr, Ta, Hf, and Win the alloy composition is below 0.3 atomic percent;
- the nanocrystalline alloy ribbon having a heat-treated local structure including nanocrystals with average particle sizes of less than 40 nm dispersed in an amorphous matrix of the nanocrystalline alloy ribbon and occupying more than 30 volume percent of the nanocrystalline alloy ribbon,
- the nanocrystalline alloy ribbon exhibiting, based on the heat-treated local structure,
- a radius of ribbon curvature of at least 200 mm,
- a B80/Bs ratio of 0.92 to 0.98, where B80 is magnetic induction at 80 A/m, and Bs is saturation induction,
- a magnetic induction at 80 A/m exceeding 1.6 T and below 1.75 T,
- a coercivity Hc of less than 6.5 A/m, and
- a core loss at 1.5 T and 50 Hz of less than 0.27 W/kg.
Dependencies are inferred from the claim text.