# US 8,465,605 B2 · Method for the production and use of semi-finished products on the basis of nickel, having a recrystallization cube texture

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- Number: US 8,465,605 B2
- Document ID: US8465605B2
- Status: Granted
- Kind: B2
- Application number: 11/886,348
- Filed: 2006-03-15
- Published: 2009-01-08
- Granted: 2013-06-18
- Earliest claimed: 2005-03-16
- Assignees: Leibniz-Institut FüR FestköRper-Und Werkstoffforschung Dresden E.V.
- Applicants: Jörg Eickemeyer; Dietmar Selbmann; Horst Wendrock; Bernhard Holzapfel
- Inventors: Jörg Eickemeyer; Dietmar Selbmann; Horst Wendrock; Bernhard Holzapfel
- Web page: https://patentgrep.com/patent/US8465605B2

## CPC

- C22F 1/10: of nickel or cobalt or alloys based thereon
- B22F 2003/248: {Thermal after-treatment}
- B22F 2998/00: Supplementary information concerning processes or compositions relating to powder metallurgy
- C22F: CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass, C23F17/00)
- B22F: WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER (making alloys by powder metallurgy C22C); APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER

## Abstract

A nickel-based semi-finished product, for making a high-temperature superconductor, embodied in the form of a strip or flat wire is produced and used as a base for physical-chemical coatings provided with a high-quality intense microstructural orientation. The semi-finished product has an improved granular structure provided with a stable cube texture. A fusion or powder metallurgy process including mechanical alloys makes a semi-finished product including a technically pure Ni or Ni alloy containing an Ag additive in a specified microalloy range. The product is shaped as a strip or flat wire by hot- and cold forming processes with a thickness reduction >50% The product is softened by annealing at 500 to 850° C. and is subsequently quenched. Afterwards, the product is exposed to the 80% cold shaping. A recrystallization annealing treatment is carried out to obtain an entire cubic texture.

## Claims

### Claim 1

A method for the production of a product on the basis of nickel, having a recrystallization cube texture, wherein first, a starting product is produced by way of a melt-metallurgy or powder-metallurgy process, with the inclusion of mechanical alloying, the starting product being produced by adding Ag into technically pure Ni or a Ni alloy so that the starting product has an Ag addition in a microalloying range of at least 10 atom ppm and maximally 1000 atom ppm, wherein this starting product is processed into strip or flat wire having an intermediate dimension, by hot-forming with subsequent cold-forming at >50% thickness reduction, this strip or flat wire is softened by annealing at a temperature within the temperature range between 500° C. and 850° C., whereby higher temperatures in the temperature range between 500° C. and 850° C. are used for higher Ag contents, thereupon quenching takes place, wherein subsequently, cold-forming occurs to a degree >80%, and wherein finally, recrystallizing annealing treatment is performed in order to achieve a complete cube texture.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the final recrystallization annealing treatment is carried out as a function of alloy content in the nickel, at temperatures of 500° C. to 1200° C.

### Claim 3 (depends on 2)

The method according to claim 2, wherein the final recrystallization annealing treatment is carried out at a temperature of 850° C.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the product is heat-treated in an oxidizing atmosphere, after or during the recrystallizing annealing, for the purpose of growing a cube-textured NiO layer with a texture content of >90%.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the Ni alloy having the Ag addition is used for the starting product, the Ni alloy further having at least one of Mo and W.