Product Selection Criteria

Properties Units Aluminum Oxide
Nominal Aluminum Oxide Content Percent Alumina 87 92 94 94 96 99.5
Density
(Apparent Specific Gravity)
gm/cc 3.48 3.57 3.67 3.7 3.75 3.90-3.94
Phases Major
Minor
Trace
alpha Al203
Amorphous
-
alpha Al203
Amorphous
-
alpha Al203
Amorphous
-
alpha Al203
Amorphous
-
alpha Al203
Spinel
-
alpha Al203
-
Ca, Mg
Hardness HV5
(KHN5)
kg/mm2 985
(880)
1050
(880)
1120
(970)
1100
(990)
1255
(1,185)
1530
(1,400)
Flexural Strength
(3 Point)
kpsi
MPa
42
290
46.5
320
47
324
50
345
50
345
55
379
Weibull Modulus - 6 11 9 16 12 10
Tensile Strength
(ACMA Test #4)
kpsi
MPa
18.0
124
18.5
127
24.0
165
28.5
196
22.0
151
31.2
215
Compressive Strength
(ASTMC-733-74)
kpsi
MPa
235
1600
280
1900
350
2400
350
2400
325
2241
260
1800
Fracture Toughness
(KIc)
(Indentation)
MPa · m1/2 3.9 - 3.9 4.5 3.7 4.3
Young's Modulus
(Ultrasonic)
psi 3.60E+07 4.25E+07 4.00E+07 4.61E+07 4.50E+07 4.80E+07
Shear Modulus
(Ultrasonic)
psi 1.50E+07 1.75E+07 1.65E+07 1.90E+07 1.80E+07 1.90E+07
Poisson's Ratio
(ASTMC-623)
0.2 0.21 0.21 0.21 0.25 0.26
Coefficient of Linear Thermal Expansion
(x per degree C)
(ASTM-32)
25-200°C
25-500°C
25-800°C
25-1000°C
5.10E-06
6.50E-06
7.50E-06
8.00E-06
5.10E-06
6.70E-06
7.50E-06
7.80E-06
3.60E-06
6.70E-06
7.70E-06
8.10E-06
5.20E-06
7.30E-06
8.00E-06
8.50E-06
5.40E-06
7.40E-06
8.10E-06
8.50E-06
5.10E-06
7.40E-068.10E-06
8.50E-06
Thermal Conductivity
W/m/degree K
25°C
400°C
800°C
1000°C
21.0
-
-
-
17.0
-
-
-
28.1
-
-
-
20.0
-
-
-
28.5
10.1
6.3
5.4
35.4
12.1
7.5
6.4
Dielectric Strength
(ASTMD-149 6.35mm)
V/mil - 211 204 212 207 215
Dielectric Constant at 25°C
(ASTMD-116)
1KHz
1MHz
1GHz
-
-
-
-
8.8
-
-
9.2
-
-
9.3
-
-
9.5
-
-
9.8
-
Dissipation Factor at 25°C
(ASTMD-116)
1KHz
1MHz
1GHz
-
-
-
-
0.008
-
-
0.007
-
-
0.002
-
-
0.016
-
-
0.002
-
Volume Resistivity
(Ohm-cm)
(ASTMC-257)
100°C
300°C
500°C
700°C
-
-
-
-
-
1.00E+13
1.00E+10
-
9.50E+14
1.20E+12
1.20E+09
2.50E+07
-
1.00E+08
1.00E+07
-
1.80E+14
1.40E+10
5.80E+07
3.50E+06
1.50E+15
2.50E+11
5.50E+08
1.60E+07
Thermal Shock
(Hasselman)
Degrees C 200 200 200 200 200 200
Porosity
(Helium Mass Spectrometer)
- Gas Tight Gas Tight Gas Tight Gas Tight Gas Tight Gas Tight
Water Absorption - None None None None None
Color - Off White White White Pink White Off White
Properties Units Zirconia Silicon Nitride Direct Sintered Silicon Carbide
Nominal Aluminum Oxide Content Percent Alumina ZTA TZP Si3N4 SiC
Density
(Apparent Specific Gravity)
gm/cc 4.48 6.05 3.2 3.12
Phases Major
Minor
Trace
alpha Al203
t-ZrO2
M-ZrO2
t-ZrO2
-
M-ZrO2
-
-
-
alpha SiC
-
-
Hardness HV5
(KHN5)
kg/mm2 1650
(1,500)
1150
(1,035)
1180
(1,062)
2600
(2,400)
Flexural Strength
(3 Point)
kpsi
MPa
110
756
120
825
100
692
72
500
Weibull Modulus - 11 19 18 8
Tensile Strength
(ACMA Test #4)
kpsi
MPa
70
481
85
584
-
-
-
-
Compressive Strength
(ASTMC-733-74)
kpsi
MPa
425
2930
425
2930
-
-
362
2500
Fracture Toughness
KIc (Indentation)
MPa · m1/2 6.5 12.0 5.2 3.5-4.0
Young's Modulus
(Ultrasonic)
psi 4.03E+007 2.50E+007 4.00E+007 6.3E+007
Shear Modulus
(Ultrasonic)
psi 1.65E+07 1.105E+07 - -
Poisson's Ratio
(ASTMC-623)
0.22 0.33 .28 .16
Coefficient of Linear Thermal Expansion
(x per degree C) (ASTM-32)
25-200°C
25-500°C
25-800°C
25-1000°C
7.80E-06
8.50E-06
9.10E-06
9.10E-06
5.90E-06
9.90E-06
1.07E-05
1.09E-05
-
-
-
3.00E-06
4.40E-06
-
-
-
Thermal Conductivity
W/m/°K
25°C
400°C
800°C
1000°C
15.8
-
-
-
2.9
-
-
-
16.7
-
-
-
50
-
-
-
Dielectric Strength
(ASTMD-149 6.35mm)
V/mil - - - -
Dielectric Constant at 25°C
(ASTMD-116)
1KHz
1MHz
1GHz
-
-
-
-
-
-
-
-
-
-
-
-
Dissipation Factor at 25°C
(ASTMD-116)
1KHz
1MHz
1GHz
-
-
-
-
-
-
-
-
-
-
-
-
Volume Resistivity
Ohm-cm (ASTMD-257)
100°C
300°C
500°C
700°C
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Thermal Shock
(Hasselman)
Degrees C 250 320 - 300
Porosity
(Helium Mass Spectrometer)
- Gas
Tight
Gas
Tight
Gas
Tight
Gas
Tight
Water Absorption - None None None None
Color - White Gold Gray Gray