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Comparison between properties

Comparison between ceramic material properties datasheet (91kB)


  

OxidesCarbideNitride

Al 2O 3ZrO2/Y2O3ZrO2/MgOMgOSiCSi3N4 Reaction sinteredSi3N4 Hot pressedALN
Physical properties







Density (g/cm3)3,95,95,753,583,23,273,293,26
Molecular weight (g/mole)102--40,440,114014041
Maximum service temperature air (°C)1700- 180015001000220015001200- 15001100- 16001000- 1800
Mechanical properties







Hardness (Mohs)9--5,59--7
Modulus of elasticity (GPa)300-400200200250-300420170-220280-310318
Poisson's ratio0,25--0,180,140,25-0,260,270,25
Fracture toughness (MPa.m1/2)2-37-136-10-2,5-3,53,5-56,14,5
Electrical properties







Dielectric constant9-10--9-10-10109,2
Electrical resistivity at 20°C (Ohm.cm)>10 1410 13-10 14>10 10-10 2-10 6>10 710 12- 10 15>10 14
Dielectric strength (kV/mm)10-2092-10----15
Thermal properties







Specific heat (J/K/kg)900400-500420870-880750690680-800800
Thermal conductivity (W/m/K) at 20°C26-352,2-3,21,5-2,540-5063-1559-3015-43180
Coefficient of thermal expansion ( 10-6) from 20 to 1000°C8-910-115-1610-134-533,34,4-5,3
Melting point (°C)20502590-28002500190019002200
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