Apparatus and method for producing a strip using a rapid solidification technology, and a metallic strip

Patent metadata

Field	Value
Publication number	US-12138684-B2
Application number	US-202318118223-A
Country	US
Kind code	B2
Filing date	Mar 7, 2023
Priority date	Feb 19, 2020
Publication date	Nov 12, 2024
Grant date	Nov 12, 2024

Abstract

A method for producing a strip using a rapid solidification technology is provided. A melt is poured onto a moving outer surface of a rotating casting wheel, the melt is solidified on the outer surface and a strip is formed. A gaseous jet is directed at the moving outer surface and the outer surface of the casting wheel is worked with the jet. The jet comprises CO 2 and at least part of this CO 2 strikes the moving outer surface of the casting wheel in a solid state.

First claim

The invention claimed is:

1. A metallic strip consisting of:
Fe 100-a-b-w-x-y-z T a M b Si w B x P y C z (in at %) and up to 1 at % impurities, T denoting one or more elements in the group consisting of Co, Ni, Cu, Cr and V, and M denoting one or more of the elements in the group consisting of Nb, Mo and T a , where
0≤a≤70
0≤b≤9
0≤w≤18
5≤x≤20
0≤y≤7
0≤z≤2,
having at least one surface ( 16 ) with an average surface roughness R a of between 0.05 μm and 1.5 μm, wherein the metallic strip is amorphous or nanocrystalline,
the metallic strip having a casting-wheel side that has been solidified on an outer surface of a casting wheel, an opposing air side and a structure that is at least 80% by volume amorphous or that has at least 80% by volume nanocrystalline grains and an amorphous residual matrix in which at least 80% of the nanocrystalline grains have an average grain size of less than 50 nm and a random orientation, and the air side and/or the casting-wheel side having a surface crystallisation proportion of less than 23%.

2. A metallic strip according to claim 1 , wherein the surface roughness R a has a deviation of less than +/−0.2 μm over a production length of at least 5 km.

3. A metallic strip according to claim 1 , which has a technically clean surface free from organic and inorganic residues on the casting-wheel side immediately after detaching from the casting wheel.

4. A metallic strip according to claim 1 , which has a width of 2 μmm to 300 μmm, a thickness of less than 50 μm and a maximum of 50 holes per square meter.

5. A metallic strip according to claim 1 , which has a width of 20 μmm to 200 mm and/or a thickness of between 10 μm and 18 μm and/or fewer than 25 holes per square meter.

Assignees

• Vacuumschmelze Gmbh & Co Kg

Inventors

• Hartmann Thomas
• Schulz Robert

Classifications

• B22D11/0611 Primary

  formed by a single casting wheel, e.g. for casting amorphous metal strips or wires · CPC title

• B22D11/001

  of specific alloys · CPC title

• B22D11/12

  Accessories for subsequent treating or working cast stock in situ (rolling immediately subsequent to continuous casting B21B1/46, B21B13/22) · CPC title

• B22D11/10

  Supplying or treating molten metal (B22D41/00 takes precedence) · CPC title

• B22D11/068

  for cooling the cast product during its passage through the mould surfaces (cooling open-ended moulds B22D11/04; secondary cooling B22D11/124) · CPC title