# SiAlON vs. Aluminum Nitride

Both SiAlON and aluminum nitride are non-oxide engineering ceramics. There are 18 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is SiAlON and the bottom bar is aluminum nitride.

Metric UnitsUS Customary Units

## Mechanical Properties

Compressive (Crushing) Strength, MPa | 2620 | |

2100 |

Elastic (Young's, Tensile) Modulus, GPa | 290 | |

330 |

Flexural Strength, MPa | 680 | |

190 to 400 |

Fracture Toughness, MPa-m^{1/2} |
6.3 | |

2.9 |

Knoop Hardness | 1700 | |

1160 |

Poisson's Ratio | 0.23 | |

0.21 to 0.31 |

## Thermal Properties

Maximum Temperature: Mechanical, °C | 1200 | |

1380 |

Maximum Thermal Shock, °C | 300 | |

220 |

Specific Heat Capacity, J/kg-K | 880 | |

780 |

Thermal Conductivity, W/m-K | 19 | |

80 to 190 |

Thermal Expansion, µm/m-K | 3.6 | |

4.2 to 5.4 |

## Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz | 9.3 | |

6.9 to 28 |

Dielectric Strength (Breakdown Potential), kV/mm | 8.3 | |

15 to 56 |

Electrical Resistivity Order of Magnitude, 10^{x} Ω-m |
14 | |

10 to 12 |

## Otherwise Unclassified Properties

Density, g/cm^{3} |
3.3 | |

2.9 to 3.3 |

## Common Calculations

Stiffness to Weight: Axial, points | 50 | |

55 to 63 |

Stiffness to Weight: Bending, points | 67 | |

69 to 80 |

Thermal Diffusivity, mm^{2}/s |
6.4 | |

31 to 74 |