Mullite vs. Yttria

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

For each property being compared, the top bar is mullite and the bottom bar is yttria.

Mullite Yttria (Yttrium Oxide, Y₂O₃)

Metric UnitsUS Customary Units

Material Properties

Compressive (Crushing) Strength, MPa		800
Compressive (Crushing) Strength, MPa		390

Density, g/cm³		2.7 to 3.0
Density, g/cm³		5.0

Elastic (Young's, Tensile) Modulus, GPa		110 to 170
Elastic (Young's, Tensile) Modulus, GPa		120

Maximum Temperature: Mechanical, °C		1680
Maximum Temperature: Mechanical, °C		2000

Specific Heat Capacity, J/kg-K		950
Specific Heat Capacity, J/kg-K		440

Stiffness to Weight: Axial, points		22 to 31
Stiffness to Weight: Axial, points		13

Stiffness to Weight: Bending, points		58 to 62
Stiffness to Weight: Bending, points		32

Thermal Conductivity, W/m-K		3.5 to 11
Thermal Conductivity, W/m-K		0.3

Thermal Diffusivity, mm²/s		1.4 to 3.7
Thermal Diffusivity, mm²/s		0.14

Thermal Expansion, µm/m-K		5.8
Thermal Expansion, µm/m-K		8.0

Mullite vs. Yttria

Material Properties

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