The paper describes the method of melt-textured growth(MTG) witha top-seeded technique to prepare the quasi-single crystal domain YBCO bulk materials with various Y-211 particle contents. The obtained specimens have high density and good mechanical toughness. The JC of specimens reaches 1.23×106 A/cm2 under 0.6 T at 30 K and 1.35×104 A/cm2 under 2 T at 70 K. The SEM observation of specimens indicates that Y-211 particles can improve the quality of melt-textured YBCO superconductor. Combining the microstructures with JC measurements shows that the smaller the particle size and the more homogeneous the particle distribution is, the better the pinning effectiveness is.%采用熔融织构生长法（MTG）结合顶部籽晶工艺（TSP）制备了不同Y-211粒子含量的准单畴熔融织构的YBCO块材，样品致密度高，机械强度好。VSM测量结果表明：样品在30K、0.6T下，临界电流密度JC达到1.23×106A/cm2；在70K、2T下，JC为1.35×104A/cm2，且JC对磁场不敏感。SEM分析结果表明：Y-211相的掺杂能够改善织构样品的生长状况，同时，掺杂的Y-211粒子又能作为强的钉扎中心；所制备的样品中Y-211粒子分布越均匀，尺寸越小，其钉扎效果越好。
展开▼
