Rapid reactive synthesis and sintering of textured Ca3Co4O9 ceramics by spark plasma sintering
Rapid reactive synthesis and sintering of textured Ca3Co4O9 ceramics by spark plasma sintering
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DOI：
10.1016/j.jmatprotec.2007.12.093
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发表时间：
2008-11
影响因子：
6.3
通讯作者：
Yanfeng Zhang;Jiuxing Zhang
中科院分区：
文献类型：
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作者：
Yanfeng Zhang;Jiuxing Zhang
采用草酸盐共沉淀法和放电等离子烧结（SPS）技术相结合，成功制备了织构化Ca3Co4O9陶瓷。将共沉淀前驱体粉末在800℃下煅烧6或8h，在30MPa、850℃下放电等离子烧结5min，可得到晶粒排列整齐的单相Ca3Co4O9陶瓷。 SPS工艺是获得纯相、织构化Ca3Co4O9陶瓷的有效烧结技术。在 SPS 处理过程中，致密化和反应同时发生。在 100 至 700°C 范围内研究了所制备的陶瓷样品的热电性能。在700℃下，800℃煅烧8h制备的样品的电阻率、塞贝克系数、热导率和ZT分别为7.50×10−5Ωm、165μVK−1、1.62Wm−1K−1和0.22。
Textured Ca3Co4O9ceramics were successfully prepared by combination oxalate coprecipitation method and spark plasma sintering (SPS) technique. Single-phase Ca3Co4O9ceramics with grain aligned can be obtained by spark plasma sintering at 30MPa, 850°C for 5min using the coprecipitation precursor powders calcined at 800°C for 6 or 8h. The SPS process is effective sintering technology to obtain pure phase and textured Ca3Co4O9ceramics. During SPS treatment the densification and reaction occur simultaneously. The thermoelectric properties of the prepared ceramics sample were investigated from 100 to 700°C. At 700°C, the electrical resistivity, Seebeck coefficient, thermal conductivity and ZT of the sample prepared by the powders calcined at 800°C for 8h are 7.50×10−5Ωm, 165μVK−1, 1.62Wm−1K−1, and 0.22, respectively.