In research of YBCO coated conductors, the development of a oxide template for epitaxial growth of YBCO is very important. Matsumoto et al have demonstrated the potential of the surface oxidation epitaxial (SOE) route...In research of YBCO coated conductors, the development of a oxide template for epitaxial growth of YBCO is very important. Matsumoto et al have demonstrated the potential of the surface oxidation epitaxial (SOE) route for formation a cube textured NiO layer on nickel tapes. The epitaxial NiO functions as a buffer layer of chemical reaction between YBCO and nickel, and as a template for the epitaxial growth of YBCO. However, the surface quality of NiO is difficult to control and defects such as crack, spall and deep grooves exist in SOE NiO layer. A new approach combining sputtering and SOE method to obtain crack-free and cube textured NiO layer were reported. Ni tapes prepared by the combination of rolling and recrystallization were used for this work. A coating of Ni was first deposited on the tapes via magnetron sputtering. Then on the coating tapes, continuous and textured NiO layer were achieved by SOE technology.展开更多
The influences of heal treatment and pH value on corrosion potential and cyclic polarization curve or an Al-Li alloy in 3.5 wt.-%NaCl were investigated.Microstructures of the alloy were combined to analyze and explain...The influences of heal treatment and pH value on corrosion potential and cyclic polarization curve or an Al-Li alloy in 3.5 wt.-%NaCl were investigated.Microstructures of the alloy were combined to analyze and explain the development of cyclic polarization curves and the variation of corrosion potential within 24 h.The results revealed that the preferential dissolution of the precipitates in the alloy increased the susceptibility of the alloy to localized corrosion.Prolonging artificial ageing treatment caused heavy precipitation of T1 phase in matrix and both precipitation of phases containing copper and widening of PFZ along the grain boundary,and thus worsened the corrosion resistance.展开更多
文摘In research of YBCO coated conductors, the development of a oxide template for epitaxial growth of YBCO is very important. Matsumoto et al have demonstrated the potential of the surface oxidation epitaxial (SOE) route for formation a cube textured NiO layer on nickel tapes. The epitaxial NiO functions as a buffer layer of chemical reaction between YBCO and nickel, and as a template for the epitaxial growth of YBCO. However, the surface quality of NiO is difficult to control and defects such as crack, spall and deep grooves exist in SOE NiO layer. A new approach combining sputtering and SOE method to obtain crack-free and cube textured NiO layer were reported. Ni tapes prepared by the combination of rolling and recrystallization were used for this work. A coating of Ni was first deposited on the tapes via magnetron sputtering. Then on the coating tapes, continuous and textured NiO layer were achieved by SOE technology.
文摘The influences of heal treatment and pH value on corrosion potential and cyclic polarization curve or an Al-Li alloy in 3.5 wt.-%NaCl were investigated.Microstructures of the alloy were combined to analyze and explain the development of cyclic polarization curves and the variation of corrosion potential within 24 h.The results revealed that the preferential dissolution of the precipitates in the alloy increased the susceptibility of the alloy to localized corrosion.Prolonging artificial ageing treatment caused heavy precipitation of T1 phase in matrix and both precipitation of phases containing copper and widening of PFZ along the grain boundary,and thus worsened the corrosion resistance.
