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 |
α Al203 Amorphous - |
α Al203 Amorphous - |
α Al203 Amorphous - |
α Al203 Amorphous - |
α Al203 Spinel - |
α 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-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 |
α Al203 t-ZrO2 M-ZrO2 |
t-ZrO2 - M-ZrO2 |
- - - |
α 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 |