Approaching ultra-low thermal conductivity in β-SiC nanoparticle packed beds through multiple heat blocking mechanisms. (February 2017)

• Record Type: Journal Article
• Authors: Wan, Peng; Gao, Liyin; Wang, Jingyang
• Is Part Of: Scripta materialia. Volume 128(2017)
• Page Start: 1
• Page End: 5
• Publication Date: 2017-02
• Subjects: Nanostructured SiC -- Low thermal conductivity -- High thermal stability; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2016.09.027
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: The crucial challenge for oxide thermal insulators, such as Al2 O3 and SiO2 nano-particle aggregates, is to solve the trade-off between extremely low thermal conductivity and unsatisfied sintering stability. We herein report the ultra-low thermal conductivities (0.068–0.1 W m − 1 K − 1 ) of β-SiC nanoparticle (~ 35 nm) packed beds. The breakthrough is realized by multiple heat blocking mechanisms in the nanostructures. The samples also possess good thermal stability as high as 1500 °C. Our results provide a new strategy to explore ultra-low thermal conductivity materials with excellent thermal stability, regardless of their high intrinsic lattice thermal conductivities. Graphical abstract: