Development of Composite RABiTS Tapes for Coated Conductors

Abstract

Substrate materials are the key element of the coated conductors. There are two types of substrates-nontextured (stainless steel (SS) or Hastelloy alloys) and textured ones which are based on the Ni-W alloys. The main requirements for the textured tapes (RABiTS) are the presence of the highly pronounced biaxial cubic texture {100} < 100 > and low values of magnetic susceptibility. To realize these requirements RABiTS tapes of various kinds were developed-homogenous tapes from Ni-W alloys with W content 5.5-9 at.% and composite ones. Composite tapes consist of three layers-one of SS and two of Ni-W alloy with W content 6 at.%. Mechanical and magnetic properties of the tapes were investigated and the dependence of tapes texture quality from total accumulated deformations was studied. The ultimate tensile strength value of composite tapes was 750 ± 10 MPa. The conditions necessary to form the required {100} < 100 > texture are different for the homogeneous and composite tapes. According to the magnetic measurements saturation magnetization of composite tapes is about a factor of two lower than for similar homogeneous tapes.

Features Of Obtaining Superconducting Layer In Second-Generation High-Temperature Superconducting Tapes Pulsed Laser Deposition Method

“…Currently, there are two basic approaches to creating textures in HTSC tapes. The first one is to use a biaxially textured metal backing strip obtained by cold deformation (rolling) followed by texturing annealing [5,6]. The second one is the formation of a textured buffer layer with an assist ion beam on a polycrystalline metal tape [7][8][9].…”

“…В настоящее время существует два основных подхода к созданию текстуры в ВТСП лентах. Первый подход заключается в использовании биаксиально текстурированной металлической ленты-подложки, полученной путем холодной деформации (прокатки) и последующего текстурирующего отжига [5,6]. Второйформирование текстурированного буферного слоя с ассистирующим ионным пучком на поликристаллической металлической ленте [7][8][9].…”