镧锶锰氧球形颗粒脱脂行为的研究

Study on degreasing behavior of lanthanum strontium manganite （LSM） spherical particles

摘要:

以La₂O₃，SrCO₃和MnO₂为原料，采用搅拌球磨、喷雾干燥技术，制得结构不稳定的镧锶锰氧（LSM）球形颗粒，不稳定的LSM球形颗粒需要低温煅烧以排除颗粒内部的有机物．为了研究不稳定LSM球形颗粒脱脂过程中的行为变化，通过TGA-DSC法分析镧锶锰氧（LSM）球形颗粒中间体在0~1300 ℃之间的失重曲线和热量变化，初步确定脱脂温度范围，再结合实验确定脱脂温度、升温速率及脱脂时间等参数．研究结果表明：在脱脂温度为550 ℃、升温速率小于5 ℃/min、脱脂时间4 h条件下，脱脂后的镧锶锰氧（LSM）球形外貌不会被损坏，且中间体中的有机物得以有效脱出．

Abstract:

Raw materials， La₂O₃， SrCO₃ and MnO₂， were used to obtain lanthanum strontium manganite （LSM） spherical particles with unstable structure by ball milling and spray drying. LSM spherical particles need to be degreased at low temperature to eliminate organic inside the particles. Both weight loss and heat change of curve of LSM spherical particles between 0-1300 ℃ were analyzed by TGA-DSC and determine the degreasing temperature range， in order to study the behavior change of unstable LSM spherical particles during degreasing process. Then degreasing temperature， heating rate and holding time were determined by experiments. The results show that degreasing temperature is 550 ℃， the heating rate is less than 5 ℃/min and the holding time is 4 h， the spherical appearance of LSM spherical particles is not damaged and the organic can be effectively removed.