# SiAlON vs. Limestone

SiAlON belongs to the non-oxide engineering ceramics classification, while limestone belongs to the natural stone. There are 17 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

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

Metric UnitsUS Customary Units

## Mechanical Properties

Compressive (Crushing) Strength, MPa | 2620 | |

700 |

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

77 |

Poisson's Ratio | 0.23 | |

0.25 |

Shear Modulus, GPa | 120 | |

30 |

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

100 |

## Thermal Properties

Maximum Temperature: Mechanical, °C | 1200 | |

360 |

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

920 |

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

2.1 |

Thermal Expansion, µm/m-K | 3.6 | |

8.0 |

## Electrical Properties

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

8.0 |

## Otherwise Unclassified Properties

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

2.6 |

## Common Calculations

Stiffness to Weight: Axial, points | 50 | |

16 |

Stiffness to Weight: Bending, points | 67 | |

55 |

Strength to Weight: Axial, points | 16 | |

11 |

Strength to Weight: Bending, points | 22 | |

18 |

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

0.88 |

Thermal Shock Resistance, points | 13 | |

12 |