| 摘要 |
PURPOSE:To improve critical current density by blending oxide superconductor material powder or raw material powder thereof with inorganic material powder having a melting point higher than that of the former by a specific temperature range. CONSTITUTION:Raw material powder of superconductor material such as Bi2O3, SrCO3, CaCO3 or CuO having <=100mum particle diameter having <=100mum particle diameter is blended. The raw material powder is mixed with 0.5-40 wt.% based on the raw material powder of the superconductor material of inorganic material powder, e.g. a metal such as W, an oxide such as MgO, a carbide such as B4C, a nitride such as TlN, a silicide such as TiSi2 or a sulfide such as CeS having >=100 deg.C higher melting point than the raw material powder of the superconductor material and <=10mum particle diameter. The mixed powder is calcined at 800-900 deg.C, sintered in N2 flow, in O2 flow or in a mixed gas flow of Ar and O2, in the atmosphere, etc., to give an oxide superconductor of Bi-Sr-Ca-Cu- O base, etc., having high critical current density. |
