纳米SiO2包覆提高填充方钴矿热电材料热稳定性

doi:10.3724/SP.J.1077.2010.00577

无机材料学报 ›› 2010, Vol. 25 ›› Issue (6): 577-582.DOI: 10.3724/SP.J.1077.2010.00577

纳米SiO₂包覆提高填充方钴矿热电材料热稳定性

魏平, 董春垒, 赵文俞, 张清杰

(武汉理工大学材料复合新技术国家重点实验室, 武汉 430070)

收稿日期:2009-10-14 修回日期:2009-12-29 出版日期:2010-06-20 网络出版日期:2010-05-12
基金资助:
国家重点基础研究发展计划(2007CB607506); 国家自然科学基金(50930004, 50972114)

Enhancement of Thermal Stability of Filled Skutterudite Thermoelectric Materials through Nano-SiO₂ Coating

WEI Ping, DONG Chun-Lei, ZHAO Wen-Yu, ZHANG Qing-Jie

(State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China)

Received:2009-10-14 Revised:2009-12-29 Published:2010-06-20 Online:2010-05-12

摘要/Abstract

摘要： 采用熔融结合放电等离子体烧结制备了单相Ba_0.3In_0.2Ni_0.05Co_3.95Sb₁₂块体材料, 并用湿化学包覆处理方法制备了纳米SiO₂包覆的Ba_0.3In_0.2Ni_0.05Co_3.95Sb₁₂/SiO₂纳米复合材料, 重点研究了两种(Ba,In)双原子填充方钴矿基块体材料在300~723~300 K范围热循环2000次过程中其显微结构、化学成分和热电性能的演变特征. 结果发现, 纳米SiO₂包覆可以显著提高(Ba,In)双原子填充方钴矿块体材料的热稳定性, 单相Ba0.3In0.2Ni0.05Co3.95Sb12块体材料晶界处的显微结构和化学成分发生显著变化, Ba_0.3In_0.2Ni_0.05Co_3.95Sb₁₂/SiO₂纳米复合材料几乎没有影响, 纳米SiO₂起着稳定晶界和抑制晶内元素扩散与挥发的作用. 热循环过程中, 两种材料在300和500 K时的综合热电性能ZT值相近, 变化很小; 800 K时, 单相块体材料的ZT值呈逐渐降低趋势, 纳米复合材料由于受热导率的复杂变化影响其ZT值, 随淬火次数增加而逐渐增大, 淬火1800次时ZT值达到1.12, 甚至高于未淬火的Ba_0.3In_0.2Co_3.95Ni_0.05Sb₁₂/SiO₂纳米复合材料(1.08)和淬火1800次后的单相Ba_0.3In_0.2Co_3.95Ni_0.05Sb₁₂块体材料(1.10)的ZT值.

关键词: 热电材料, SiO2包覆, 填充方钴矿, 热稳定性

Abstract: Single-phase Ba_0.3In_0.2Ni_0.05Co_3.95Sb₁₂bulk materials were synthesized by melting and spark plasma sintering (SPS) methods. Ba_0.3In_0.2Ni_0.05Co_3.95Sb₁₂/SiO₂nanocomposite material with nano-SiO₂coating was prepared by wet chemical coating processing. Emphases were given on the evolution of microstructure, chemical composition, and thermoelectric properties of two kinds of (Ba,In) double-atom filled skutterudite based bulk materials during periodic thermal cycling 2000 times in the range of 300-723-300 K. It was found that the thermal stability of (Ba,In) double-atom filled skutterudite was remarkably improved after nano-SiO₂ coated. The microstructure and chemical composition along the grain boundaries of single-phase Ba_0.3In_0.2Ni_0.05Co_3.95Sb₁₂bulk material obviously changed, while the thermal cycling had no effect on Ba_0.3In_0.2Ni_0.05Co_3.95Sb₁₂/SiO₂nanocomposite. Thus the nano-SiO₂stabilized the grain boundary and prevented the elements diffusing and volatilizing from intra-grain. The ZT values of two kinds of materials were very close and kept unchanged at 300 K and 500 K during the thermal cycling. The ZT values of single-phase bulk materials gradually decreased at 800 K. However, the ZT values of nanocomposite mainly depended on the complex changes in thermal conductivity and increased with prolonging of quenching time, then reached 1.12 at 800 K after quenching for 1800 times, which was even higher than those of unquenched Ba_0.3In_0.2Co_3.95Ni_0.05Sb₁₂/SiO₂ nanocomposite (ZT=1.08) and single-phase Ba_0.3In_0.2Co_3.95Ni_0.05Sb₁₂ bulk material(ZT=1.10) quenched for 1800 times.

Key words: thermoelectric material, SiO2 coating, filled skutterudite, thermal stability

中图分类号:

TB34

魏平, 董春垒, 赵文俞, 张清杰. 纳米SiO₂包覆提高填充方钴矿热电材料热稳定性[J]. 无机材料学报, 2010, 25(6): 577-582.

WEI Ping, DONG Chun-Lei, ZHAO Wen-Yu, ZHANG Qing-Jie. Enhancement of Thermal Stability of Filled Skutterudite Thermoelectric Materials through Nano-SiO₂ Coating[J]. Journal of Inorganic Materials, 2010, 25(6): 577-582.

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纳米SiO₂包覆提高填充方钴矿热电材料热稳定性

Enhancement of Thermal Stability of Filled Skutterudite Thermoelectric Materials through Nano-SiO₂ Coating

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