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研究了成份为（ＢｉＰｂ）＿（１８）Ｓｒ＿（２．０）Ｃａ＿（２．２）Ｃｕ＿（３．０）Ｏ＿ｘ的低密度冷压烧结块材，高密度热等静压块材及银包覆轧制带在磁场下的临界电流密度，体钉扎力密度与磁场的关系。钉扎机理的曲线拟合表明，磁通线剪切机理可以解释试样的磁通线钉扎行为。晶界第二相（玻璃相）、位错、层错的观察支持这种钉扎机理的判断。银包覆轧制带传输临界电流在磁场下的各向异性表明，要进一步改善钉扎能力需获取纳米级晶内钉扎中心。
The low density cold-pressed sintered block, high density hot isostatic pressing block and silver package with (BiPb) _ (18) Sr_ (2.0) Ca_ (2.2) Cu_ (3.0) O_x The relationship between the critical current density, the density of body pinning force and the magnetic field in the covered strip under magnetic field. The curve fitting of the pinning mechanism shows that the flux line shear mechanism can explain the flux pinning behavior of the sample. The observation of the second phase (glass phase), dislocation and stacking fault in the grain boundary supports the judgment of this pinning mechanism. The anisotropy of the critical current in the silver-coated rolled strip under magnetic field indicates that the nanocrystal pinning center needs to be obtained to further improve the pinning ability.