MakeItFrom.com
Menu (ESC)
Home>Oxide-Based Engineering CeramicUp Two>AluminaUp One

Alumina vs. SAE-AISI H25 Steel

Alumina and SAE-AISI H25 steel belong to fundamentally different material chemistries. Alumina is a ceramic material, while SAE-AISI H25 steel is a metal. Therefore, their performance will be even more dissimilar than would be suggested by the difference in properties. There are 14 material properties with values for both materials. Properties with values for just one material (20, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is alumina and the bottom bar is SAE-AISI H25 steel.

Alumina (Aluminum Oxide, Al2O3)SAE-AISI H25 (T20825) Tungsten Hot-Work Steel
Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220 to 370
200
Poisson's Ratio 0.22 to 0.24
0.29
Tensile Strength: Ultimate (UTS), MPa 210 to 290
710 to 1620

Thermal Properties

Melting Onset (Solidus), °C 2040
1700
Specific Heat Capacity, J/kg-K 870 to 940
420
Thermal Conductivity, W/m-K 14 to 30
26
Thermal Expansion, µm/m-K 6.7 to 8.2
12

Otherwise Unclassified Properties

Density, g/cm3 3.4 to 4.1
9.1

Common Calculations

Stiffness to Weight: Axial, points 35 to 53
12
Stiffness to Weight: Bending, points 57 to 62
22
Strength to Weight: Axial, points 14 to 23
22 to 50
Strength to Weight: Bending, points 19 to 28
20 to 34
Thermal Diffusivity, mm2/s 3.7 to 10
6.7
Thermal Shock Resistance, points 4.9 to 14
22 to 49