## Abstract

Thermal diffusivity and conductivity of ceramic materials in a system of Si_{3}N_{4}-SiO_{2}-Al_{2}O_{3}-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 language | English |
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Pages (from-to) | 494-496 |

Number of pages | 3 |

Journal | Journal of Applied Physics |

Volume | 77 |

Issue number | 2 |

DOIs | |

State | Published - 1 Dec 1995 |