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 7.2A degrees and 6.1A degrees in Ni5W substrate, 7.6A degrees and 6.1A degrees 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 (a parts per thousand currency sign 10A degrees) is about 98 %. This process is a potential possibility for producing long-length textured CeO2/Ni5W tapes for coated conductors with a low cost.