The biaxially textured ion beam-assisted deposited(IBAD)-MgO templates were successfully prepared on polycrystalline Hastelloy metal substrate with reel-to-reel system for YB2Cu3O7-d(YBCO)-coated conductors.By the sol...The biaxially textured ion beam-assisted deposited(IBAD)-MgO templates were successfully prepared on polycrystalline Hastelloy metal substrate with reel-to-reel system for YB2Cu3O7-d(YBCO)-coated conductors.By the solution deposition planarization technique,amorphous Y2O3films were coated on untreated Hastelloy substrate as the bed layer to obtain smooth,dense,and crack-free surface for subsequent IBAD-MgO deposition.The 50 m long IBAD-MgO and homo-epitaxial(epi)-MgO buffer layers deposited on Y2O3films exhibit excellent crystallographic consistency along the scope with full width half maximum(FWHM)values of(110)DU and(200)Dx in the range of 5.5°–6.0°and3.0°–3.5°,respectively.To match the lattice constant of YBCO material,LaMnO3cap layer was fabricated on IBAD-MgO templates by radio frequency(rf)magnetron sputtering with the FWHM values of in-plane and out-ofplane of 6.8°and 3.7°,respectively,indicating excellent biaxial texture.展开更多
According to running experience of high speed railway abroad, a full attention must be paid to some requirements of specification of rails for high speed railway, such as material mechanical properties, dimension tole...According to running experience of high speed railway abroad, a full attention must be paid to some requirements of specification of rails for high speed railway, such as material mechanical properties, dimension tolerances, straightness, surface flatness and so on. It is suggested that the long length rails should be laid in high speed railway, and the feasibility of producing, welding and transporting of long length rails should be researched. On the basis of technical innovation of domestic manufacturers, it is practicable to lay 50-100 m long\|length homemade rails in high speed railway of China. The following welding programme of rails for high speed railway can be adop\| ted: 50-100 m long length rails can be welded as 500 m long rail string through flash butt welding in plant, then in field the rail string can be welded through a mobile flash butt welding or thermit welding. As the specification of rails for high speed railway is rigorous, some related techniques to long length rails should be researched and practised as soon as possible, including mobile flash butt welding technique, transporting and reinforcing techniques of long length rails, etc..展开更多
基金supported by the Sichuan Youth Science and Technology Innovation Research Team (No. 2011JTD0006)Fundamental Research Funds for the Central Universities (Nos. ZYGX2012J039 and ZYGX2011Z002)
文摘The biaxially textured ion beam-assisted deposited(IBAD)-MgO templates were successfully prepared on polycrystalline Hastelloy metal substrate with reel-to-reel system for YB2Cu3O7-d(YBCO)-coated conductors.By the solution deposition planarization technique,amorphous Y2O3films were coated on untreated Hastelloy substrate as the bed layer to obtain smooth,dense,and crack-free surface for subsequent IBAD-MgO deposition.The 50 m long IBAD-MgO and homo-epitaxial(epi)-MgO buffer layers deposited on Y2O3films exhibit excellent crystallographic consistency along the scope with full width half maximum(FWHM)values of(110)DU and(200)Dx in the range of 5.5°–6.0°and3.0°–3.5°,respectively.To match the lattice constant of YBCO material,LaMnO3cap layer was fabricated on IBAD-MgO templates by radio frequency(rf)magnetron sputtering with the FWHM values of in-plane and out-ofplane of 6.8°and 3.7°,respectively,indicating excellent biaxial texture.
文摘According to running experience of high speed railway abroad, a full attention must be paid to some requirements of specification of rails for high speed railway, such as material mechanical properties, dimension tolerances, straightness, surface flatness and so on. It is suggested that the long length rails should be laid in high speed railway, and the feasibility of producing, welding and transporting of long length rails should be researched. On the basis of technical innovation of domestic manufacturers, it is practicable to lay 50-100 m long\|length homemade rails in high speed railway of China. The following welding programme of rails for high speed railway can be adop\| ted: 50-100 m long length rails can be welded as 500 m long rail string through flash butt welding in plant, then in field the rail string can be welded through a mobile flash butt welding or thermit welding. As the specification of rails for high speed railway is rigorous, some related techniques to long length rails should be researched and practised as soon as possible, including mobile flash butt welding technique, transporting and reinforcing techniques of long length rails, etc..
