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Aluminum Oxide (Al2O3)

 

Properties
Units
Test
Value
Physical
Chemical Formula
-
-
Al2O3
Density, r
g/cm3
ASTM C20
3.21
Color
-
-
ivory/white
Crystal Structure
-
-
hexagonal
Water Absorption
% @R.T.
ASTM C373
0.0
Hardness
Mohs
-
9
Hardness
knoop (kg/mm2)
Knoop 100g
2000
Mechanical
Compressive Strength
MPa @ R.T.
ASTM C773
2070-2620
Tensile Strength
MPa @ R.T.
ACMA Test #4
206-300
Modulus of Elasticity
(Young's Modulus)
GPa
ASTM C848
393
Flexural Strength (MOR)
MPa @ R.T.
ASTM F417
310-379
Poisson's Ratio, u
ASTM C818
0.27
Fracture Toughness, KIc
MPa x m1/2
Notched Beam Test
4.5
Thermal
Max. Use Temperature
(* denotes inert atm.)
ºC
No load cond.
1750
Thermal Shock Resistance
DT (ºC)
Quenching
200
Thermal Conductivity
W/m-K @ R.T.
ASTM C408
35
Coefficient of Linear Thermal Expansion, al
mm/m-ºC (~25ºC through ±1000ºC)
ASTM C372
8.4
Specific Heat, cp
cal/g-ºC @ R.T.
ASTM C351
0.21
Electrical
Dielectric Constant
1MHz @ R.T.
ASTM D150
9.6
Dielectric Strength
kV/mm
ASTM D116
15
Electrical Resistivity
Wcm @ R.T.
ASTM D1829
>1014