Combustion synthesis, powder treatment, dispersion and tape casting of lanthanum strontium manganite

British Ceramic Transactions Pub Date : 2003-10-01 DOI:10.1179/174327613X13789817049865

M. Kakade, S. Ramanathan, P. De

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引用次数: 10

Abstract

Abstract Lanthanum strontium manganite La0·84Sr0·16MnO3 (LSM)powder was prepared by combustion synthesis, using a concentrated solution of nitrates of lanthanum, strontium, and manganese as oxidiser, and citric acid as fuel. The as formed powder was found to be crystalline LSM consisting of porous agglomerates of fine particles, and exhibited about 7% total weight loss on heating up to 1100 °C. Dispersion conditions for wet grinding of the powder agglomerates calcined at 1100 °C were evaluated from zeta potential and viscositystudies. A maximum zeta potential of - 35 mV was noted at a pH of 11, while pseudoplasticity of the slurry decreased with decreasing solid concentration. Powder with d50 of around 3 μm and free of agglomerates of size greater than 10 μm was formed by wet grinding. Further calci nation of this powder at 1350 °C improved the solids loading in the slurry. The tape cast slurry composition was optimised for minimum content of binder, plasticiser, and water with acceptable pseudoplasticity to form flexible and flat tapes. The dried tapes cut to required sizes were subjected to controlled binder burnout followed by sintering in the range 1350-1450 °C. The sintered flat specimens exhibited densities in the range 65-80% of theoretical, and open porosities in the range 35-20%, with a homogeneous distribution of pore phase in the matrix.

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镧锶锰酸盐的燃烧合成、粉末处理、分散和带状铸造

摘要以镧、锶、锰的浓硝酸盐溶液为氧化剂，柠檬酸为燃料，采用燃烧合成法制备了镧锶锰酸盐La0·84Sr0·16MnO3 (LSM)粉体。形成的粉末是由细颗粒的多孔团块组成的结晶LSM，加热到1100℃时，总重量损失约7%。从zeta电位和粘度研究中评估了1100°C煅烧的粉末团块湿法研磨的分散条件。pH = 11时zeta电位最大值为- 35 mV，浆料的假塑性随固体浓度的降低而降低。湿法磨成d50约为3 μm，不含粒径大于10 μm的团聚体的粉体。该粉末在1350℃下进一步煅烧，提高了浆料中的固体负荷。胶带浇铸浆的组成优化为最低含量的粘合剂，增塑剂和水，具有可接受的假塑性，以形成柔性和扁平的胶带。将干燥的胶带切割成所需的尺寸，然后在1350-1450°C范围内进行受控的粘结剂烧尽，然后烧结。烧结平面试样的密度为理论密度的65 ~ 80%，开孔率为35 ~ 20%，孔隙相在基体中分布均匀。

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来源期刊

British Ceramic Transactions

CiteScore

0.10

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0.00%

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