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Method for preparing biaxially textured polycrystalline silver substrate

A technology of polycrystalline silver and texture, which is applied in the field of preparation of polycrystalline textured silver substrates, can solve the problems of severe grain boundary corrosion, no surface state, and inability to eliminate surface rolling marks, etc.

Inactive Publication Date: 2004-11-17
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, foreign research groups have obtained silver substrates with {110} biaxial texture, using the method of annealing in air or vacuum, and experiments have proved that: annealing at temperatures above 800°C in air, The corrosion of the grain boundary is very severe, which deepens and widens the grain boundary; while annealing in vacuum cannot eliminate the surface rolling marks
Therefore, although the silver base band obtained in the two annealing atmospheres has a good texture, it does not have a good surface state.

Method used

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  • Method for preparing biaxially textured polycrystalline silver substrate
  • Method for preparing biaxially textured polycrystalline silver substrate
  • Method for preparing biaxially textured polycrystalline silver substrate

Examples

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Effect test

example 1

[0021] Example 1. Grinding and polishing the rolls of a rolling mill. The low-oxygen-content silver ingot with a purity of 99.99% and vacuum smelting is used, and cut into 3.5mm thick silver plates; then cold-rolled at room temperature. The amount of deformation in the first pass is 35%, the amount of deformation in subsequent passes is 15-20%, and the total amount of deformation is 90%. The rolled silver strip is placed in an air annealing furnace, slowly heated to 700°C, and then kept for 30 minutes to form a {110} silver texture, see figure 1 . figure 1 middle 1 =90°, φ=45°,  2 The concentration distribution area of ​​intensity = 0° means {110} texture, which has strong strength and single composition.

example 2

[0022] Example 2. Grinding and polishing the rolls of a rolling mill. The vacuum smelted low-oxygen silver ingot with a purity of 99.99% is used to cut into 4.5mm thick silver plates; and then cold-rolled at room temperature. The amount of deformation in the first pass is 30%, the amount of deformation in subsequent passes is 30-40%, and the total amount of deformation is 97%. Put the rolled silver strip in an annealing furnace with an argon atmosphere, slowly heat it to 920°C, and then keep it warm for 3 hours to form a {110} silver texture, see figure 2 . A single-oriented {110} silver texture is formed, with high texture strength and single composition.

example 3

[0023] Example 3. Grinding and polishing the rolls of a rolling mill. The low-oxygen-content silver ingot with a purity of 99.9% and vacuum smelting is used to cut into 3.96mm-thick silver plates; and then cold-rolled at room temperature. The amount of deformation in the first pass is 15%, the amount of deformation in subsequent passes is 10-40%, and the total amount of deformation is 94%. Put the rolled silver strip in an annealing furnace with an oxygen atmosphere, slowly heat it to 800°C, and then keep it for 10 hours to form a {110} silver texture, see image 3 . A single-oriented {110} silver texture is formed, with high texture strength and single composition.

[0024] Example 4. Grinding and polishing the rolls of a rolling mill. The vacuum smelted low-oxygen silver ingot with a purity of 99.99% is used to cut into 3.87mm thick silver plates; and then cold rolled at room temperature. The deformation amount of the first pass is 20%, the deformation amount of subseque...

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Abstract

A process for preparing biaxially textured polycrystalline silver substrate belonging the field of high temperature superconductive coating tough substrate and superconductive film preparation which comprises the steps of, lowering the oxygen content in the raw material by employing the existing vacuum melting method, moulding into silver blank, cold rolling the silver plate at room temperature, annealing 0.5-10 hours, thus obtaining the biaxial structure. Annealing in the gaseous mixture of argon gas and 2-15% by volume of air, carrying out surface treatment to the prepared silver belt, preparing superconducting film through thermal decomposition method of trifluoroacetic acid.

Description

technical field [0001] The invention relates to a method for preparing a polycrystalline textured silver baseband, which belongs to the technical field of high-temperature superconducting coating toughness baseband and superconducting thin film preparation. Background technique [0002] Making high-temperature superconducting materials with ceramic brittleness into wires and strips is an important link to realize their practical applications. In recent years, people have made great progress in the preparation of high-temperature superconducting long strips by depositing superconducting films on polycrystalline ductile metal substrates. Yttrium barium copper oxide (YBaCu) with a length of 10 meters has been prepared. 2 Cu 3 o 7-δ ) superconducting tape, which is expected to be used in strong electric applications. Silver is the only baseband metal that does not require an isolation layer when preparing superconducting materials. If the texture of polycrystalline silver rib...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/14
Inventor 刘丹敏周美玲胡延槽李尔东刘敏
Owner BEIJING UNIV OF TECH