Fabrication of Ni-5 at. %W Long Tapes with CeO₂ Buffer Layer by Reel-to-Reel Method

A 10-m-long homemade textured Ni-5at.%W (Ni5W) long tape with a CeO₂ buffer layer has been prepared successfully by means of rolling-assisted biaxially textured substrate (RABiTS) route followed by a chemical solution deposition method in a reel-to-reel manner. Globally, the Ni5W substrate and CeO₂ film exhibit high homogeneity in terms of biaxial texture over the tape. The average values of full width at half maximum of in-plane and out-of-plane texture are 7.2° and 6.1° in Ni5W substrate, 7.6° and 6.1° in CeO₂ buffer layer, respectively, all of those with a small standard deviation. On a microlevel, the CeO₂ film epitaxially grows well on top of the Ni5W tape. A continuous, smooth, and crack-free morphology was observed on the CeO₂ film and the fraction of low-angle grain boundaries (≤ 10°) is about 98 %. This process is a potential possibility for producing long-length textured CeO₂/Ni5W tapes for coated conductors with a low cost.