Machinable Aluminum Nitride
Machinable AlN is a grade of aluminum nitride. The graph bars on the material properties cards below compare machinable 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
270 MPa 40 x 103 psi
Fracture Toughness
2.9 MPa-m1/2 2.6 x 103 psi-in1/2
Knoop Hardness
1160
Poisson's Ratio
0.31
Thermal Properties
Maximum Temperature: Corrosion
1900 °C 3450 °F
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
96 W/m-K 56 BTU/h-ft-°F
Thermal Expansion
4.5 µm/m-K
Other Material Properties
Density
2.9 g/cm3 180 lb/ft3
Dielectric Constant (Relative Permittivity) At 1 MHz
6.9
Dielectric Strength (Breakdown Potential)
56 kV/mm 2.2 V/mil
Electrical Dissipation At 1 Hz
0.0019
Electrical Dissipation At 1 MHz
0.00090
Electrical Resistivity Order of Magnitude
10 10x Ω-m
Common Calculations
Stiffness to Weight: Axial
63 points
Stiffness to Weight: Bending
80 points
Thermal Diffusivity
43 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