Pressure Sintered (Hot Pressed) Aluminum Nitride
Hot pressed AlN is a grade of aluminum nitride. The graph bars on the material properties cards below compare hot pressed AlN to other non-oxide engineering ceramics (top) and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Compressive (Crushing) Strength
2100 MPa 300 x 103 psi
Elastic (Young's, Tensile) Modulus
330 GPa 47 x 106 psi
Flexural Strength
350 MPa 51 x 103 psi
Fracture Toughness
2.9 MPa-m1/2 2.6 x 103 psi-in1/2
Knoop Hardness
1160
Poisson's Ratio
0.24
Electrical Properties
Dielectric Constant (Relative Permittivity) At 1 MHz
8.8
Dielectric Strength (Breakdown Potential)
17 kV/mm 0.64 V/mil
Electrical Dissipation At 1 Hz
0.0019
Electrical Dissipation At 1 MHz
0.00068
Electrical Resistivity Order of Magnitude
12 10x Ω-m
Other Material Properties
Density
3.3 g/cm3 200 lb/ft3
Maximum Temperature: Mechanical
1380 °C 2520 °F
Maximum Thermal Shock
220 °C 440 °F
Specific Heat Capacity
780 J/kg-K 0.19 BTU/lb-°F
Thermal Conductivity
80 W/m-K 46 BTU/h-ft-°F
Thermal Expansion
5.3 µm/m-K
Common Calculations
Stiffness to Weight: Axial
56 points
Stiffness to Weight: Bending
70 points
Thermal Diffusivity
31 mm2/s
Followup Questions
Further Reading
Handbook of Refractory Carbides and Nitrides: Properties, Characteristics, Processing and Applications, Hugh O. Pierson, 1996
IEC 60672-3: Ceramic and glass-insulating materials - Part 3: Specifications for individual materials
Springer Handbook of Condensed Matter and Materials Data, W. Martienssen and H. Warlimont (editors), 2005
Sintering of Advanced Materials: Fundamentals and Processes, Zhigang Zak Fang (editor), 2010
CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015