材料科学
多孔性
微观结构
烧结
陶瓷
复合材料
热导率
电阻率和电导率
电气工程
工程类
作者
Shynar Kultayeva,Jang‐Hoon Ha,Rohit Malik,Young‐Wook Kim,Kwang Joo Kim
标识
DOI:10.1016/j.jeurceramsoc.2019.11.045
摘要
The effects of porosity on the electrical and thermal conductivities of porous SiC ceramics, containing Y2O3–AlN additives, were investigated. The porosity of the porous SiC ceramic could be controlled in the range of 28–64 % by adjusting the sacrificial template (polymer microbead) content (0–30 wt%) and sintering temperature (1800–2000 °C). Both electrical and thermal conductivities of the porous SiC ceramics decreased, from 7.7 to 1.7 Ω−1 cm−1 and from 37.9 to 5.8 W/(m·K), respectively, with the increase in porosity from 30 to 63 %. The porous SiC ceramic with a coarser microstructure exhibited higher electrical and thermal conductivities than those of the ceramic with a finer microstructure at the equivalent porosity because of the smaller number of grain boundaries per unit volume. The decoupling of the electrical conductivity from the thermal conductivity was possible to some extent by adjusting the sintering temperature, i.e., microstructure, of the porous SiC ceramic.
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