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CN-122025278-A - Production process of superconducting wire and superconducting enameled wire

CN122025278ACN 122025278 ACN122025278 ACN 122025278ACN-122025278-A

Abstract

The application discloses a production process of a superconducting wire and a superconducting enameled wire, and belongs to the technical field of superconducting wires. The production process comprises paying off, molding, cleaning, annealing, painting and baking, detecting and taking up. The method comprises the steps of a painting baking step, namely dividing the painting baking cycle into a base layer painting step and a reinforcing layer painting step, wherein the base layer painting step is used for carrying out low-temperature baking on thin paint, the reinforcing layer painting step is used for carrying out standard baking on the residual times, the reinforcing layer is baked for the first time by adopting a step heating process, the reinforcing layer is kept at the temperature of 240-260 ℃ for 10-15 s and then is heated to 280-300 ℃ for curing, and a controlled slow cooling section is added after the step heating baking step for gradually cooling. According to the application, heat accumulation and radial temperature difference in the process of multiple painting are restrained through two-stage distribution, a gradient cross-linking structure is formed through step heating, interlayer bonding strength is improved, residual thermal stress is eliminated through controlled slow cooling, pinholes and concave-convex defects are reduced, and product qualification rate is improved.

Inventors

  • ZHANG XINMAN
  • ZHANG JIANJUN

Assignees

  • 浙江诚峰新材料科技有限公司

Dates

Publication Date
20260512
Application Date
20260327

Claims (10)

  1. 1. A process for producing a superconducting wire, comprising the steps of: Paying off; forming, namely rolling the round wire into a core wire with a set specification; cleaning, namely cleaning the formed core wire; annealing, namely annealing the core wire running at a constant speed through an annealing furnace; The method comprises the steps of painting and baking, namely enabling a core wire which runs at a constant speed to enter a constant-temperature painting room for painting, then entering a baking oven for baking, and repeating the painting and baking for 6-10 times, wherein the core wire is subjected to constant temperature before each painting, so that the temperature of the core wire is matched with the temperature of paint liquid; detecting the core wire after painting and baking; winding, namely winding the core wire to a finished spool; The method comprises the steps of carrying out a painting baking step, namely dividing 6-10 times of painting baking circulation into a base layer painting stage and a reinforcing layer painting stage, carrying out 1-3 times of painting baking in the base layer painting stage, wherein the thickness of a paint film formed by each painting is 5-10 mu m, the baking temperature is 240-260 ℃, the remaining times of painting baking in the reinforcing layer painting stage, and the thickness of the paint film formed by each painting is 10-80 mu m, and the baking temperature is 260-300 ℃.
  2. 2. The process for producing superconducting wires according to claim 1, wherein in the basic layer painting stage, the temperature at which the core wire is set before each painting is higher than the constant temperature painting booth temperature by 2 ℃ to 5 ℃, and the constant temperature painting booth temperature is 40 ℃ to 45 ℃.
  3. 3. The process for producing superconducting wires according to claim 1, wherein in the reinforcing layer painting stage, the temperature at which the core wire is set before each painting is higher than the constant temperature painting booth temperature by 2 ℃ to 5 ℃, and the constant temperature painting booth temperature is 40 ℃ to 45 ℃.
  4. 4. The process for producing superconducting wires according to claim 1, wherein the basic layer painting stage is carried out 2 times of painting baking, each paint film thickness is 10 μm, the baking temperature is 250 ℃, and the reinforcing layer painting stage is carried out 4 times of painting baking, each paint film thickness is 20 μm, and the baking temperature is 280 ℃.
  5. 5. The process for producing superconducting wires according to claim 1, wherein the first baking in the reinforcing layer painting stage adopts a step heating process, wherein a core wire enters a first temperature zone, the temperature is set to 240-260 ℃, the residence time is 10-15 s, then enters a second temperature zone, the temperature is set to 280-300 ℃, and the residence time is 40-80 s.
  6. 6. The process of claim 5, wherein the first temperature zone is at the same temperature as the last baking temperature of the base layer painting stage, and the rate of temperature rise between the first temperature zone and the second temperature zone is 10 ℃ per second to 20 ℃ per second.
  7. 7. The process according to claim 1, wherein in the annealing step, the annealing temperature is 280 ℃ to 320 ℃ and the annealing time is 80s to 100s.
  8. 8. The process for producing a superconducting wire according to claim 1, wherein acetal insulating paint is adopted in the painting and baking step, and the baking time is 40 s-80 s.
  9. 9. The process for producing the superconducting wire according to claim 1, wherein in the step of painting and baking, a controlled slow cooling section is arranged between an outlet of a baking furnace and an inlet of a constant temperature chamber, a core wire enters the constant temperature chamber after being baked, the length of the controlled slow cooling section is 1.5-3.0 m, the controlled slow cooling section is internally divided into a first slow cooling section and a second slow cooling section, the temperature of the first slow cooling section is set to be 80-100 ℃, the residence time is 5-10 s, the temperature of the second slow cooling section is set to be 40-45 ℃, the residence time is 5-10 s, and the total cooling rate of the slow cooling section is 5-10 ℃ per second.
  10. 10. A superconducting wire, characterized in that it is prepared by the superconducting wire production process according to any one of claims 1 to 9.

Description

Production process of superconducting wire and superconducting enameled wire Technical Field The invention relates to the technical field of superconducting wires, in particular to a production process of a superconducting wire and a superconducting enameled wire. Background Enameled wires are widely applied to electrical equipment, and wires are continuously subjected to paying-off, forming, annealing, painting, baking, detecting and winding equipment in the painting process. The superconducting wire is used in the fields of medical equipment, maglev trains and the like, and requires that the core wires are continuous, uniform in thickness of an insulating paint layer, free of pinholes and free of concave-convex. In the existing superconducting wire production process, annealed wires and baked wires are directly painted, if the temperature of the wires is too high, the adhesion amount of paint liquid is small, pinholes are easy to form, and if the temperature of the wires is too low, the adhesion paint liquid has poor fluidity, and concave-convex is easy to appear. To solve this problem, the prior art proposes to set the core wire at a temperature slightly higher than the paint temperature (e.g. CN 118197707B) before each painting to ensure the paint film quality. However, in the actual production of the multiple painting, the heat of the previous baking is gradually accumulated in the core wire, resulting in the overall temperature rise of the core wire and the radial temperature difference, i.e., the core temperature is higher than the surface, deteriorating with the increase of the painting times. The surface temperature of the core wire can only be controlled by the constant temperature chamber, the core waste heat is released at a painting interface, and the matching precision of the core wire temperature and the paint temperature is damaged, so that pinholes and concave-convex defects are caused. Meanwhile, a rigid interface is formed between the base layer and the reinforcing layer due to the difference of curing temperature, interlayer stripping is easy to occur under the subsequent coiling or thermal shock working condition, and the reliability of the product is affected. In addition, rapid cooling after baking may leave thermal stresses at the interface, further weakening the interlayer bond. Disclosure of Invention The production process of the superconducting wire and the superconducting enameled wire solve the technical problems that in the prior art, radial temperature difference is gradually deteriorated due to heat accumulation in a multi-painting process, core wire temperature and paint Wen Pipei are invalid, a rigid interface is formed between a base layer and a reinforcing layer due to solidification temperature difference, interlayer stripping is caused, and interface stability is affected by rapid cooling residual thermal stress after baking, and the technical effects of accurately controlling the core wire temperature, eliminating the rigid interface to form a gradient crosslinking structure, releasing residual thermal stress, and further obtaining the high-quality superconducting enameled wire with uniform and non-defect insulating layers, high interlayer bonding strength and excellent thermal shock resistance are achieved in the multi-painting cycle. The embodiment of the application provides a production process of a superconducting wire, which comprises the following steps of: Paying off; forming, namely rolling the round wire into a core wire with a set specification; cleaning, namely cleaning the formed core wire; annealing, namely annealing the core wire running at a constant speed through an annealing furnace; The method comprises the steps of painting and baking, namely enabling a core wire which runs at a constant speed to enter a constant-temperature painting room for painting, then entering a baking oven for baking, and repeating the painting and baking for 6-10 times, wherein the core wire is subjected to constant temperature before each painting, so that the temperature of the core wire is matched with the temperature of paint liquid; detecting the core wire after painting and baking; winding, namely winding the core wire to a finished spool; The method comprises the steps of carrying out a painting baking step, namely dividing 6-10 times of painting baking circulation into a base layer painting stage and a reinforcing layer painting stage, carrying out 1-3 times of painting baking in the base layer painting stage, wherein the thickness of a paint film formed by each painting is 5-10 mu m, the baking temperature is 240-260 ℃, the remaining times of painting baking in the reinforcing layer painting stage, and the thickness of the paint film formed by each painting is 10-80 mu m, and the baking temperature is 260-300 ℃. Further, in the base coat painting stage, the temperature at which the core wire is set before each painting is 2 ℃ to 5 ℃ higher than the constant tempera