REBa2Cu3Ox Superconductive Wire With Low-Halogen Layer Control

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Solution Overview

Problem

Chlorine in the raw material solution of existing superconductive wires disrupts the compositional balance and reduces the volume of the oxide superconductive film, as described in PTL 1.

Innovation Solution

A superconductive wire with a halogen concentration in the superconductive layer reduced to less than 2000 ppm by mass, achieved through a manufacturing process involving a solution application and controlled calcination steps, optionally using alkali metals to minimize halogen presence.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If chlorine is contained in the raw material solution to assist in orienting crystals during manufacturing, then crystal orientation is improved, but the compositional balance of REBa2Cu3Ox is disrupted and the volume of the oxide superconductive film is reduced

Engineering Contradiction:

Improvecompositional balance of REBa2Cu3OxVSAvoidvolume of oxide superconductive film

Core Design Contradiction:

Stability of the object's compositionVSQuantity of substance

Solution Approach 1:

The patent extracts and removes halogen (chlorine) from the final superconductive layer through controlled calcination processes. The halogen is taken out during manufacturing by heating the precursor layer to decompose and volatilize halogen-containing compounds, thereby preventing halogen incorporation into the crystal structure and maintaining both compositional balance and film volume.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent applies preliminary action by controlling the calcination process to prevent halogen incorporation in the first place. By optimizing heating temperature and atmosphere conditions during calcination, the process prevents halogen from being incorporated into the REBa2Cu3Ox crystal structure, thereby maintaining compositional balance and film volume from the outset.

Inventive Principle:

Principle #10Preliminary action

2Stability of the object's composition

If halogen concentration in the superconductive layer is reduced to less than 2000 ppm by mass, then compositional balance and film volume are maintained, but manufacturing process complexity increases

Engineering Contradiction:

Improvecompositional balance of REBa2Cu3OxVSAvoidmanufacturing process complexity

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The patent applies parameter changes by optimizing calcination conditions (temperature, atmosphere, duration) to control halogen removal. By adjusting these parameters, the process achieves effective halogen elimination without requiring additional complex manufacturing steps, thereby maintaining compositional balance while managing process complexity.

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Prevents disruption of the compositional balance and maintains the volume of the superconductive layer, ensuring stable performance.

Implementation Method 1

The superconductive layer contains halogen. The concentration of halogen in the superconductive layer is less than 2000 ppm by mass

Methodology Applied

Scientific EffectHalogen concentration control:

Data Source

PatentUS20250364157A1Superconductive wire and method of manufacturing superconductive wire

Publication Date: 2025.11.27 SUMITOMO ELECTRIC INDUSTRIES LTD

AI summary

The superconductive wire includes a superconductive layer containing REBa2Cu3Ox. RE represents a rare earth element. The superconductive layer contains halogen. The concentration of halogen in the superconductive layer is less than 2000 ppm by mass.