# SiAlON vs. CVD Diamond

Both SiAlON and CVD diamond are non-oxide engineering ceramics. There are 16 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is SiAlON and the bottom bar is CVD diamond.

Metric UnitsUS Customary Units

## Mechanical Properties

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

1050 |

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

5.5 |

Poisson's Ratio | 0.23 | |

0.1 |

Tensile Strength: Ultimate (UTS), MPa | 190 | |

750 |

## Thermal Properties

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

500 |

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

1900 |

Thermal Expansion, µm/m-K | 3.6 | |

1.0 |

## Electrical Properties

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

5.7 |

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

13 |

## Otherwise Unclassified Properties

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

3.5 |

## Common Calculations

Stiffness to Weight: Axial, points | 50 | |

170 |

Stiffness to Weight: Bending, points | 67 | |

96 |

Strength to Weight: Axial, points | 16 | |

59 |

Strength to Weight: Bending, points | 22 | |

52 |

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

1080 |

Thermal Shock Resistance, points | 13 | |

51 |