Abstract
<p>The critical currents of sintered YBa<sub>2</sub>Cu<sub>3</sub>O<sub>6.5+</sub><sub>δ</sub>were measured as the variables with the corrosive time in the humid air. The corrosive process was studied by means of the current changes. Ag coating on the textured YBCO and polytetrafluoroethylene (PTFE) coating on the sintered YBCO were prepared. The critical current densities of different YBCO samples with and without coatings were compared. Both Ag coating and PTFE coating can well protect YBCO from moisture and CO<sub>2</sub>.</p>
Highlights
Since the high Tc oxide superconductors were discovered [1,2], a great progress has been attained in the area
For the Ag coated YBCO, the samples were placed in top part of a glass container, the water at the bottom of the container was heated at 60°C, its humidity was 98%, the hot moisture test was lasted for 24 hours
One of them was coated by PTFE and 4 Ag wires were welded on each of the YBCO samples to measure the critical current, which were used as the variable with the time changes of hot moisture test
Summary
Since the high Tc oxide superconductors were discovered [1,2], a great progress has been attained in the area. Self-propagating high temperature synthesis (SHS) is a process that enables the rapid formation of the materials by utilizing the energy given out in a very exothermic solid-state reaction [3,4]. In YBCO system, we performed high-energy ball milling for a mixture of metal oxide powders under various conditions.
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