| Ca3Co4O9陶瓷的热传输特性 |
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| 引用本文： | 漆小玲,曾令可,刘涛,王慧,刘平安. Ca3Co4O9陶瓷的热传输特性[J]. 硅酸盐学报, 2009, 37(6): 1022-1026 |
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| 作者姓名： | 漆小玲 曾令可 刘涛 王慧 刘平安 |
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| 作者单位： | 华南理工大学材料科学与工程学院,广州,510640;华南理工大学材料科学与工程学院,广州,510640;华南理工大学材料科学与工程学院,广州,510640;华南理工大学材料科学与工程学院,广州,510640;华南理工大学材料科学与工程学院,广州,510640 |
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| 摘 要： | 采用溶胶-凝胶法,结合常压烧结工艺制备了Ca3Co4O9陶瓷.通过热重-差示扫描量热法(thermogravimetric-differential scanning calorimetry,TG-DSC)、X射线衍射(X-ray diffraction,XRD)和扫描电镜(scanning electron microscope,SEM)等测试手段探讨了Ca3Co4O9陶瓷的形成过程,分析了不同工艺参数对Ca3Co4O9陶瓷显微结构及性能的影响,研究了晶粒尺寸与热传输性能之间的关系.结果显示:Ca3Co4O9为取向无规则层片状结构,当煅烧温度为750～900℃时,能得到纯相Ca3Co4O9,Ca3Co4O9陶瓷的热导率(k)较低,且随着温度的升高而逐渐增大.晶粒尺寸的减小对其晶格热导率(k1)影响显著,当平均晶粒由92 nm减小到63 nm时,k1由1.529 W/(m·K)减小到0.959 W/(m·K),但对载流子热导率(kc)的影响很小.Ca3Co4O9陶瓷的k随晶粒尺寸的减小而降低,主要是由于kl随晶粒尺寸的减小而降低所致.
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| 关 键 词： | 钴酸钙陶瓷 热传输特性 热导率 溶胶-凝胶法 |
THERMAL TRANSPORT PROPERTIES OF Ca_3Co_4O_9 CERAMICS |
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| QI Xiaoling,ZENG Lingke,LIU Too,WANG Hui,LIU Pingan. THERMAL TRANSPORT PROPERTIES OF Ca_3Co_4O_9 CERAMICS[J]. Journal of The Chinese Ceramic Society, 2009, 37(6): 1022-1026 |
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| Authors: | QI Xiaoling ZENG Lingke LIU Too WANG Hui LIU Pingan |
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| Affiliation: | College of Materials Science and Engineering;South China University of Technology;Guangzhou 510640;China |
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| Abstract: | Calcium cobaltite ceramics were prepared by the sol-gel method combined with the ordinary pressing sintering.The pyrolytic decomposition mechanism of the dried gel,formation process and the microstructures of Ca_3Co_4O_9 ceramics were investigated by the thermogravimetric-differential scanning calorimetry(TG-DSC),X-ray diffraction(XRD) and scanning electron microscope (SEM).The influence of different technical parameters on the microstructure and properties of the ceramics were analyzed.The influence of cry... |
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| Keywords: | calcium cobaltite ceramics thermal transport properties thermoelectric conductivities sol-gel method |
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