Thermal diffusivity/conductivity in SiAlON ceramics

Dean-Mo LIu*, Cheng Jen Chen, Ray R.R. Lee

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Thermal diffusivity and conductivity of ceramic materials in a system of Si3N4-SiO2-Al2O3-AlN composed of α and β SiAlON (which is well known as duophase SiAlON ceramics) are investigated. Single-phase β-SiAlON ceramic has a thermal conductivity of 12.44 W/m K. The thermal conductivities of SiAlON ceramics decrease linearly with increasing content of α phase and can be best described by the following equation: K=12.46-0.043 f, where f is the weight percentage of α-SiAlON content and K is the thermal conductivity of SiAlON ceramics. The thermal conductivity of single-phase α-SiAlON was then estimated to be ∼8.16 W/m K, which is in excellent agreement with the literature reported values, ∼8.4 W/m K. This estimation is also close to the value, 8.22 W/m K, obtained by using Bruggeman's variable dispersion theory. The temperature dependence of the thermal conductivity of duophase SiAlON ceramics varies with α and β phase contents in the materials.

Original languageEnglish
Pages (from-to)494-496
Number of pages3
JournalJournal of Applied Physics
Volume77
Issue number2
DOIs
StatePublished - 1 Dec 1995

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