Ceramic Properties Tables
Ferro-Ceramic Grinding Inc. machines over 15 different materials
Aluminum Nitride
Aluminum Nitride PropertiesAluminum Nitride Ceramic materials physical, mechanical, thermal and electrical properties reference chart.
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Aluminum Nitride Properties
While AlN is not a 'new' material, recent manufacturability developments over the past 15 years have made this an exciting and viable ceramic design material.One of the most useful applications AlN has found is in replacing beryllium oxide (BeO) in the semiconductor industry. This substitution is due to BeO's toxicity. The thermal expansion coefficient of AlN is lower than BeO or alumina, and closely matches that of the silicon wafers used in electronics. Once a limitation for AlN's use in electronic applications there are now processes to metallize AlN.
There are electronic and structural grades of this material, classified as such by the thermal conductivity, which is controlled by the purity of the AlN. Pristine material is White, high purity is tan, and grey color indicates contaminants.
Properties
|
Units
|
Test
|
Value
|
|---|---|---|---|
Physical
|
|||
Chemical Formula
|
-
|
-
|
AIN
|
Density, r
|
g/cm3
|
ASTM C20
|
3.25
|
Color
|
-
|
-
|
white/tag/gray
|
Crystal Structure
|
-
|
-
|
hexagonal
|
Water Absorption
|
% @R.T.
|
ASTM C373
|
0.0
|
Hardness
|
Moh's
|
-
|
5
|
Hardness
|
knoop (kg/mm2)
|
Knoop 100g
|
1170
|
Mechanical
|
|||
Compressive Strength
|
MPa @ R.T.
|
ASTM C773
|
2068
|
Tensile Strength
|
MPa @ R.T.
|
ACMA Test #4
|
--
|
Modulus of Elasticity
(Young's Mod.) |
GPa
|
ASTM C848
|
308
|
Flexural Strength (MOR)
|
MPa @ R.T.
|
ASTM F417
|
428
|
Poisson's Ratio, u
|
-
|
ASTM C818
|
0.25
|
Fracture Toughness, KIc
|
MPa x m1/2
|
Notched Beam Test
|
3.5
|
Thermal
|
|||
Max. Use Temperature
(* denotes inert atm.) |
ºC
|
No load cond.
|
1600
|
Thermal Shock Resistance
|
DT (ºC)
|
Quenching
|
400
|
Thermal Conductivity
|
W/m-K @ R.T.
|
ASTM C408
|
170
|
Coefficient of Linear Thermal Expansion, al
|
mm/m-ºC (~25ºC
through ±1000ºC)
|
ASTM C372
|
4.6-5.7
|
Specific Heat, cp
|
cal/g-ºC @ R.T.
|
ASTM C351
|
0.25
|
Electrical
|
|||
Dielectric Constant
|
1MHz @ R.T.
|
ASTM D150
|
8.0-9.1
|
Dielectric Strength
|
kV/mm
|
ASTM D116
|
15
|
Electrical Resistivity
|
Wcm @ R.T.
|
ASTM D1829
|
>1014
|
*Although we have no reason to doubt the accuracy of the data presented, Ferro-Ceramic Grinding Inc. offers this information for comparison only, and disclaims any and all liability from error, omissions or inaccuracies, such that it does not constitute a warranty or representation for which we shall assume legal responsibility.