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CN-121972525-A - Surface treatment process for high-temperature superconductive foil tape N10276

CN121972525ACN 121972525 ACN121972525 ACN 121972525ACN-121972525-A

Abstract

The invention discloses a surface treatment process of a high-temperature superconductive foil tape N10276, which comprises the following steps of performing shot blasting and film breaking on a hot rolled N10276 alloy tape to break a compact oxide layer on the surface of the tape and set a spacer between the tape layers, performing compound pickling, namely immersing the tape subjected to shot blasting in pickling solution, performing pickling treatment at a set temperature and a set pickling time, wherein the pickling solution comprises sulfuric acid, sodium chloride and sodium nitrate, performing multistage grinding, namely sequentially grinding the pickled semi-finished product tape by using a plurality of groups of abrasive belts, performing fine polishing, and performing texturing rolling, namely performing rolling by using a roller with the surface subjected to laser texturing treatment in the process of finally cold rolling the ground tape until the target thickness is less than or equal to 0.046 mm. The invention can solve the problems that the prior art can not thoroughly eliminate the hot rolling oxidation defect of the N10276 alloy and can not realize the surface treatment forming of the ultrathin foil with high surface quality.

Inventors

  • ZHOU WEIGUO

Assignees

  • 江苏圣珀新材料科技有限公司

Dates

Publication Date
20260505
Application Date
20260226

Claims (8)

  1. 1. The surface treatment process of the high-temperature superconductive foil tape N10276 is characterized by comprising the following steps of: S1, shot blasting and film breaking, namely performing shot blasting treatment on the N10276 alloy strip after hot rolling to break a compact oxide layer on the surface of the strip, and arranging a spacer between the strip layers; S2, carrying out compound pickling, namely immersing the strip subjected to shot blasting into pickling solution, and carrying out pickling treatment at a set temperature for a set pickling time; The pickling solution comprises sulfuric acid, sodium chloride and sodium nitrate; s3, multistage grinding, namely sequentially grinding the pickled semi-finished product strip by using a plurality of groups of abrasive belts, and finely polishing; S4, roughing rolling, namely rolling by using a roller with the surface subjected to laser roughing treatment in the process of finally cold-rolling the grinded strip until the target thickness is less than or equal to 0.046 mm.
  2. 2. The surface treatment process of the high-temperature superconductive foil tape N10276 according to claim 1, wherein in the step S1, the shot used in the shot blasting treatment is stainless steel shredding shot or cast steel shot, the grain size is 0.2-0.6mm, and the shot blasting strength is 0.10-0.25mmN.
  3. 3. The surface treatment process of the high temperature superconductive foil tape N10276 according to claim 1, wherein in the step S1, the spacer is iron wire or stainless steel wire, and the diameter is 0.1-0.5mm.
  4. 4. The surface treatment process of the high temperature superconducting foil tape N10276 according to claim 1, wherein in the step S2, the set temperature is 60-90 ℃, the set pickling time is 30-90 minutes, and the pickling solution contains 130-140ml of 98% sulfuric acid, 70-80g of sodium chloride and 70-80g of sodium nitrate per liter of water.
  5. 5. The surface treatment process of the high temperature superconductive foil tape N10276 according to claim 1, wherein in the step S3, the abrasive belt comprises an abrasive belt of 80 mesh and 120 mesh combined used in the first stage of grinding, an abrasive belt of 120 mesh and 180 mesh combined used in the second stage of grinding, and a kiloimpeller is used for fine polishing after each stage of abrasive belt grinding.
  6. 6. The surface treatment process of the high-temperature superconductive foil tape N10276 according to claim 5, wherein the kiloimpeller is made of nylon or composite material containing silicon carbide and alumina abrasive.
  7. 7. The surface treatment process of the high temperature superconducting foil tape N10276 according to claim 1, wherein in the step S4, the surface roughness Ra of the roller is 2.8-3.2 μm, and the density of roughening pits is 50-200 pieces/cm 2.
  8. 8. The surface treatment process of the high-temperature superconductive foil tape N10276 according to claim 1, wherein in the rolling process of the step S4, tension control is carried out on the strip, the tension range is 10% -30% of the yield strength of the foil tape N10276, and lubrication and cooling are carried out by matching with rolling oil.

Description

Surface treatment process for high-temperature superconductive foil tape N10276 Technical Field The invention relates to the technical field of foil processing, in particular to a surface treatment process of a high-temperature superconductive foil N10276. Background Second generation high temperature superconducting (2G-HTS) tapes typically employ structures in which multiple functional films are deposited on a metal substrate, such as hastelloy N10276. The surface quality (roughness, cleanliness, uniformity) of the N10276 foil as a base band directly determines the quality of the epitaxially grown buffer layer and the superconducting layer, thereby affecting the critical current density of the final superconducting tape. It is generally required that the surface roughness Ra is less than or equal to 0.05 mu m, and that the surface roughness has no defects such as oxide scale, pressed material and the like. The N10276 alloy is a high nickel-chromium-molybdenum-tungsten alloy, and has extremely high-temperature strength and good oxidation resistance. This results in that conventional high-pressure water dephosphorization process cannot be adopted in the hot rolling process to prevent the temperature from dropping too fast. Therefore, a thick and compact composite oxide layer of Cr 2O3, niO and the like is formed on the surface of the strip after hot rolling, and the composite oxide layer is partially pressed into a matrix under the action of rolling force, so that oxide scale pressing defects are formed. Conventional single acid cleaning or mechanical polishing methods have difficulty in thoroughly removing this defect. In addition, when the strip is rolled to an ultrathin specification of 0.046mm or even thinner, the rigidity is extremely low, the conventional wire drawing and sanding equipment cannot be used for effective direct surface treatment, and the strip breakage and wrinkling are extremely easy to occur. Disclosure of Invention The invention aims to provide a surface treatment process of a high-temperature superconductive foil tape N10276, which aims to solve the problems that the existing process can not thoroughly eliminate the hot rolling oxidation defect of N10276 alloy and can not realize the surface treatment forming of the ultra-thin foil tape with high surface quality. In order to achieve the above purpose, the invention adopts the following technical scheme that the surface treatment process of the high-temperature superconductive foil tape N10276 comprises the following steps: S1, shot blasting and film breaking, namely performing shot blasting treatment on the N10276 alloy strip after hot rolling to break a compact oxide layer on the surface of the strip, and arranging a spacer between the strip layers; S2, carrying out compound pickling, namely immersing the strip subjected to shot blasting into pickling solution, and carrying out pickling treatment at a set temperature for a set pickling time; The pickling solution comprises sulfuric acid, sodium chloride and sodium nitrate; s3, multistage grinding, namely sequentially grinding the pickled semi-finished product strip by using a plurality of groups of abrasive belts, and finely polishing; S4, roughing rolling, namely rolling by using a roller with the surface subjected to laser roughing treatment in the process of finally cold-rolling the grinded strip until the target thickness is less than or equal to 0.046 mm. As a further description of the above technical solution: In the step S1, the shot grains used in the shot blasting treatment are stainless steel shredding shots or cast steel shots, the grain diameter of the shot grains is 0.2-0.6mm, and the shot blasting strength is 0.10-0.25mmN. As a further description of the above technical solution: In the step S1, the spacers are iron wires or stainless steel wires, and the diameter of the spacers is 0.1-0.5mm. As a further description of the above technical solution: In the step S2, the set temperature is 60-90 ℃, the set pickling time is 30-90 minutes, and the pickling solution contains 130-140ml of 98% sulfuric acid, 70-80g of sodium chloride and 70-80g of sodium nitrate per liter of water. As a further description of the above technical solution: In step S3, the abrasive belt includes an abrasive belt of 80 mesh and 120 mesh used in the first stage grinding, an abrasive belt of 120 mesh and 180 mesh used in the second stage grinding, and a kiloimpeller is used for fine polishing after each stage of abrasive belt grinding. As a further description of the above technical solution: the kiloimpeller is made of nylon or a composite material containing silicon carbide and alumina abrasive. As a further description of the above technical solution: in the step S4, the surface roughness Ra of the roller is 2.8-3.2 mu m, and the density of roughening pits is 50-200 pieces/cm <2 >. As a further description of the above technical solution: In the rolling process of the step S4, the tension of t