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Thermal and electrical transport in ZrB2-SiC-WC ceramics up to 1800 °C
Ma, Hai-Bin1,3,4; Zou, Ji2; Zhu, Jing-Ting3,4; Lu, Ping3; Xu, Fang-Fang3; Zhang, Guo-Jun1,3
2017
发表期刊Acta Materialia
ISSN13596454
卷号129页码:159-169
摘要The thermophysical properties of dense ZrB2-20 vol% SiC ceramics (ZS) with and without doping of 5 vol% WC (ZSW) were characterized up to 1800 °C. Because of the in-situ formed WB with low thermal conductivity and the strong phonon scattering effect from (Zr,W)B2solid solution, the thermal conductivity of ZSW (36.2 W/(m K)) at room temperature is much lower than that of ZS (100.4 W/(m K)), however, their differences at 1800 °C is very limited (42.2 W/(m K) for ZSW and 47.4 W/(m·K) for ZS). The detailed calculation indicates that contributions from lattice vibrations on the thermal conductivity decreased to nearly zero at 1800 °C in both samples, therefore, electrical conductivity of ZS and ZSW dominates their thermal transport behavior at higher temperatures. Furthermore, amorphous phase with compositions of Ca-Al-Si-O was occasionally found at the triple junction of ZS, its softening and rewetting of the grain boundary at higher temperature were confirmed from the internal friction curve and microstructural characterization at different levels, which was thought to be responsible for the tremendous increase of Interfacial thermal resistance and continuous drop of thermal conductivity of ZS up to 1800 °C. On the contrary, benefiting from the clean boundary and tight triple junction in ZSW, its thermal conductivity can stabilize between 36 and 47 W/(m K) in a broad temperature range from 25 to 1800 °C. Based on the measurement above, the type of carriers and thermoelectric figure of merit (zT) in ZrB2-SiC based ceramics are also firstly reported. © 2017 Acta Materialia Inc.
DOI10.1016/j.actamat.2017.02.052
EI入藏号20171003423047
EI主题词Thermal conductivity of solids
EI分类号549.3 Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals - 641.1 Thermodynamics - 804.2 Inorganic Compounds - 812.1 Ceramics - 933.1.1 Crystal Lattice - 951 Materials Science
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文献类型期刊论文
条目标识符http://ir.sic.ac.cn/handle/331005/25479
专题中国科学院上海硅酸盐研究所
作者单位1.State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Institute of Functional Materials, Donghua University, Shanghai; 201620, China;
2.School of Metallurgy and Materials, University of Birmingham, B15 2TT, United Kingdom;
3.State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai; 200050, China;
4.University of Chinese Academy of Sciences, Beijing; 100049, China
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Ma, Hai-Bin,Zou, Ji,Zhu, Jing-Ting,et al. Thermal and electrical transport in ZrB2-SiC-WC ceramics up to 1800 °C[J]. Acta Materialia,2017,129:159-169.
APA Ma, Hai-Bin,Zou, Ji,Zhu, Jing-Ting,Lu, Ping,Xu, Fang-Fang,&Zhang, Guo-Jun.(2017).Thermal and electrical transport in ZrB2-SiC-WC ceramics up to 1800 °C.Acta Materialia,129,159-169.
MLA Ma, Hai-Bin,et al."Thermal and electrical transport in ZrB2-SiC-WC ceramics up to 1800 °C".Acta Materialia 129(2017):159-169.
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