喷雾热分解分级收集对Bi2223前驱粉末的影响
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摘要
采用喷雾热分解方法制备了Bi-2223前驱粉末,对不同收集容器中的粉末进行了SEM观察、XRD分析、TG-DTA分析以及ICP-AES分析,对比了不同收集器中的粉末在外观形貌、粒径大小、相组成以及含量、成相反应以及元素原子配比等方面的差别。最终发现采用分级收集的方法制备的前驱粉,不同收集容器中粉末在粒径大小、相组成、成相行为以及元素原子配比方面差别明显,且两种收集器中粉末各元素原子实际配比与原始设计配比相比,发生严重偏离,导致最终制备的粉末不适合制备Bi-2223带材。
Spray pyrolysis process has been adopted for the fabrication of Bi-2223 precursor powders. The powders from two different collectors,namely pre cyclone collector and post filter collector were systematically characterized with SEM,XRD,TG-DTA,and ICP-AES to compare the morphology,average particle size,phase composition and content,phase transition process,as well as elementary composition. Large differences were observed with the particle size,phase composition,phase transition process as well as the elementary composition of the precursor powders from different collectors. Meanwhile,the elementary composition of the powders from two collectors exhibited large deviation from the designed composition. Therefore,these powders are not suitable for the fabrication of Bi-2223 superconducting tapes.
Spray pyrolysis process has been adopted for the fabrication of Bi-2223 precursor powders. The powders from two different collectors,namely pre cyclone collector and post filter collector were systematically characterized with SEM,XRD,TG-DTA,and ICP-AES to compare the morphology,average particle size,phase composition and content,phase transition process,as well as elementary composition. Large differences were observed with the particle size,phase composition,phase transition process as well as the elementary composition of the precursor powders from different collectors. Meanwhile,the elementary composition of the powders from two collectors exhibited large deviation from the designed composition. Therefore,these powders are not suitable for the fabrication of Bi-2223 superconducting tapes.
引文
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[5]毛传斌.Bi系超导体原始粉末的物理化学及高Tc相成相和织构形成机理[博士学位论文][D].沈阳:东北大学,1997.
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