Ceramic Alumina 96% vs. Ceramic Aluminum Nitride

Compare Ceramic Alumina 96% vs. Ceramic Aluminum Nitride strength, stiffness, weight and thermal properties.

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Ceramic Alumina 96%Sintered ceramic (pressed and fired)

Ceramic Aluminum NitrideSintered ceramic (pressed and fired)

Mechanical
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Yield strength	not given (tensile used)	not sourced
Ultimate tensile strength	221MPasourcetypical tensile strength, 25 °C (ACMA Test #4)	not sourced
Compressive strength	2,068MPasourcetypical, 20 °C (ASTM-C773)	not sourced
Flexural strength	358MPasourceflexural strength (MOR), 20 °C (ASTM-F417)	310MPasource3-point bending strength (JIS R 1601)
Elongation at break	not sourced	not sourced
Young's modulus (stiffness)	303GPasourcetypical, 20 °C (ASTM-C848)	320GPasourcetypical (JIS R 1602)
Density	3,720kg/m³sourcetypical (ASTM-C20)	3,400kg/m³sourcetypical (JIS R 1634)
Strength to weight	59.4kN·m/kg	not sourced
Stiffness to weight	81.5MN·m/kg	94.1MN·m/kg16% higher
Poisson's ratio	0.21sourcetypical, 20 °C (ASTM-C848)	0.24sourcetypical (JIS R 1602)
Shear modulus	125GPa	129GPa3% stiffer in shear
Bulk modulus	174GPa	205GPa
Speed of sound	9,025m/s	9,701m/s
Thermal
Thermal conductivity	24.7W/m·Ksourcetypical, 20 °C (ASTM-C408)	150W/m·Ksourcetypical (JIS R 1611)
Thermal expansion	8.2µm/m·Ksourcemean, 25-1000 °C (ASTM-C372)	4.6µm/m·Ksourcemean, 40-400 °C (JIS R 1618)
100 mm part over a 50 °C swing	41µm growth	23µm growth1.78x less
Specific heat	880J/kg·Ksourcetypical, 100 °C (ASTM-E1269)	710J/kg·Ksourcetypical (JIS R 1611)
Heats up and cools (diffusivity)	7.55mm²/s	62.1mm²/s8.24x faster
Thermal shock resistance	1,736W/m	not sourced
Values for	CoorsTek AD-96, nominal 96% Al2O3 sintered alumina, typical values; CoorsTek "Ceramic Seal Material Properties" (© 2018, 01899 F). AD-96 is the general 96% grade, not the ADS-96R substrate grade.	KYOCERA AN216A dense sintered aluminium nitride, typical values; KYOCERA Fineceramics Europe data sheet 2023.04.03

Every value links to the document that states it. "Not sourced" means no citable source states it (or only a specification minimum); figures computed from it are left out too.

Questions

Which is lighter, Ceramic Alumina 96% or Ceramic Aluminum Nitride?

Ceramic Aluminum Nitride is lighter: 3,400 kg/m³ against 3,720 kg/m³ for Ceramic Alumina 96%.

Which is stiffer, Ceramic Alumina 96% or Ceramic Aluminum Nitride?

Ceramic Aluminum Nitride is stiffer: Young's modulus 320 GPa against 303 GPa for Ceramic Alumina 96%, so the same part in Ceramic Aluminum Nitride deflects less under the same load.

Which is lighter for the same job, Ceramic Alumina 96% or Ceramic Aluminum Nitride?

For the same stiffness or strength: Ceramic Aluminum Nitride is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate.

Part that must be	Ceramic Alumina 96%	Ceramic Aluminum Nitride
Stiff rod or tie (tension)	16% heavier	lighter
Stiff beam (bending)	12% heavier	lighter
Stiff panel or plate	11% heavier	lighter

For the same stiffness or strength, mass scales with density over stiffness (or strength) raised to a power set by how the part is loaded: 1 for a rod in tension, 1/2 for a beam in bending, 1/3 for a panel (the standard material-selection indices).

Which conducts heat better, Ceramic Alumina 96% or Ceramic Aluminum Nitride?

Ceramic Aluminum Nitride conducts heat better: 150 W/m·K against 24.7 W/m·K for Ceramic Alumina 96%.

Which expands less with temperature?

Ceramic Aluminum Nitride expands less: 4.6 µm/m·K against 8.2 µm/m·K for Ceramic Alumina 96%.

Among 72 materials

Stiffness against density

Strength against density