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研究了低氧分压气氛中,不同熔化处理温度下单芯银包套带材(Bi,Pb)-2223(以下称Bi-2223)芯部熔化分解及随后的缓慢冷却阶段,淬火试样中Bi-2223,Bi-2201和Bi-2212相之间的演变关系.结果显示,在Tp=855℃~865℃范围内,随着熔化处理温度(Tp)的升高,淬火带材中Bi-2223相相对含量逐渐减少,而Bi-2201相含量则明显增加.Tp=855℃~860℃时,Bi-2223相发生部分分解,其淬火后的主要产物为Bi-2201,(Sr,Ca)2CuO3(2:1 AEC)和(Sr,Ca)14Cu24O41(14:24 AEC).经过随后的缓慢冷却,部分分解的Bi-2223相可以直接从液相中再形成.在所有熔化试样及部分熔化后慢冷所得的试样中均未发现Bi-2212相.当Tp=865℃时,Bi-2223相则全部分解,在同样冷却条件下,其回复过程经历了两个不同的途径,一是少量Bi-2223相直接从液相中生成,二是先从液相中析出Bi-2212相,在随后继续冷却过程中再转变为Bi-2223相.由于Bi-2212转变为Bi-2223所固有的迟缓特性,以致在本实验的冷却条件下,完全分解的Bi-2223相只能部分得到回复.

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