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Alumina vs. Yttria

Both alumina and yttria are oxide-based engineering ceramics. There are 11 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 alumina and the bottom bar is yttria.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 1920 to 2750
390
Elastic (Young's, Tensile) Modulus, GPa 220 to 370
120

Thermal Properties

Maximum Temperature: Mechanical, °C 650 to 1730
2000
Melting Onset (Solidus), °C 2040
2440
Specific Heat Capacity, J/kg-K 870 to 940
440
Thermal Conductivity, W/m-K 14 to 30
0.3
Thermal Expansion, µm/m-K 6.7 to 8.2
8.0

Otherwise Unclassified Properties

Density, g/cm3 3.4 to 4.1
5.0

Common Calculations

Stiffness to Weight: Axial, points 35 to 53
13
Stiffness to Weight: Bending, points 57 to 62
32
Thermal Diffusivity, mm2/s 3.7 to 10
0.14