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HTS wires

Yttrium-Barium-Copper-Oxide is the material which is currently used for HTS wires worldwide. In the production, the main challenge is to transform this brittle ceramic material into flexible high-performance wires required for energy applications. These requirements are fulfilled by deposition of thin HTS layers on metallic substrate tapes. Due to undesired interactions between HTS layer and metal substrate, a more complex layer architecture has to be deposited. It consists of several intermediate layers (buffer layers, thickness 10-150nm) and superconducting layers (HTS layer, thickness 500-1000nm). Anisotropic superconducting properties of the HTS material requiring an excellent crystallographic orientation of the HTS layer are an additional challenge.

The layer deposition can be performed, either by physical vacuum deposition (PVD) methods or by chemical solution deposition (CSD) processes. Whereas physical deposition consists of the evaporation of single elements in high-vacuum, chemical solution deposition is based on the deposition of metal-organic precursors under ambient pressure. Therefore PVD processes enable HTS wires with highest performance although they require high energy and raw material costs accompanied by highest investment costs for high-vacuum technology. On the other hand, the production via CSD processes offers HTS wires with medium performance at lowest prices due to low investments, low raw material and energy costs and best process scalability.
Deutsche Nanoschicht GmbH is the only company worldwide who successfully established a continuous CSD processing of the complete complex layer architecture for HTS wires.