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Comparison between properties
Comparison between ceramic material properties datasheet (91kB)
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Oxides |
Carbide |
Nitride |
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|
Al 2O 3 |
ZrO2/Y2O3 |
ZrO2/MgO |
MgO |
SiC |
Si3N4 Reaction sintered |
Si3N4 Hot pressed |
ALN |
| Physical properties |
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| Density (g/cm3) |
3,9 |
5,9 |
5,75 |
3,58 |
3,2 |
3,27 |
3,29 |
3,26 |
| Molecular weight (g/mole) |
102 |
- |
- |
40,4 |
40,1 |
140 |
140 |
41 |
| Maximum service temperature air (°C) |
1700- 1800 |
1500 |
1000 |
2200 |
1500 |
1200- 1500 |
1100- 1600 |
1000- 1800 |
| Mechanical properties |
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| Hardness (Mohs) |
9 |
- |
- |
5,5 |
9 |
- |
- |
7 |
| Modulus of elasticity (GPa) |
300-400 |
200 |
200 |
250-300 |
420 |
170-220 |
280-310 |
318 |
| Poisson's ratio |
0,25 |
- |
- |
0,18 |
0,14 |
0,25-0,26 |
0,27 |
0,25 |
| Fracture toughness (MPa.m1/2) |
2-3 |
7-13 |
6-10 |
- |
2,5-3,5 |
3,5-5 |
6,1 |
4,5 |
| Electrical properties |
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|
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| Dielectric constant |
9-10 |
- |
- |
9-10 |
- |
10 |
10 |
9,2 |
| Electrical resistivity at 20°C (Ohm.cm) |
>10 14 |
10 13-10 14 |
>10 10 |
- |
10 2-10 6 |
>10 7 |
10 12- 10 15 |
>10 14 |
| Dielectric strength (kV/mm) |
10-20 |
9 |
2-10 |
- |
- |
- |
- |
15 |
| Thermal properties |
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| Specific heat (J/K/kg) |
900 |
400-500 |
420 |
870-880 |
750 |
690 |
680-800 |
800 |
| Thermal conductivity (W/m/K) at 20°C |
26-35 |
2,2-3,2 |
1,5-2,5 |
40-50 |
63-155 |
9-30 |
15-43 |
180 |
| Coefficient of thermal expansion ( 10-6) from 20 to 1000°C |
8-9 |
10-11 |
5-16 |
10-13 |
4-5 |
3 |
3,3 |
4,4-5,3 |
| Melting point (°C) |
2050 |
2590 |
- |
2800 |
2500 |
1900 |
1900 |
2200 |
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