研究了(Bi,Pb)-2223/Ag带材在第1次热处理后,不同的冷却速率对其输运性能和微观结构的影响.利用XRD、SEM等分析手段对样品进行表征.结果表明:随着冷却速率的降低,带材中的2201相不断减少直至消失,而Ca2PbO4相的含量却不断增加:与此同时,带材中第二相粒子的尺寸也不断增大.带材的输运电流测量表明,随冷却速率(对数坐标)的降低,样品的临界电流密度线性增加,同时,带材在磁场下的性能也不断提高.这是由于慢冷导致(Bi,Pb)-2223/Ag带材的晶粒连接性变好和磁通钉扎能力提高造成的.
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