Parameters of Alumina Ceramic | ||||||||||||
Item | Test Condition | 95% AL2O3 | 99% AL2O3 | 99.7% AL2O3 | ||||||||
Physical properties | Density | g/cm3 | >3.6 | 3.89 | 3.96 | |||||||
Moisture absorption | % | 0 | 0 | 0 | ||||||||
Mechanical properties | ROHS Hardness | ≥85 | ≥89 | ≥89 | ||||||||
Flexural strength | psiX103 | 20℃ | 358 | 550 | 550 | |||||||
Compressive strength | psiX103 | 20℃ | 2068(300) | 2600(377) | 2600(377) | |||||||
Fracture toughness | Mpa.m3/2 | K(l c) | 4.3 | 5.6 | 6.0 | |||||||
Maximum use temperature | ℃ | 1450 | 1600 | 1650 | ||||||||
Thermal expansion coefficient | 1X10-6/℃ | (25-1000℃) | 7.6 | 7.9 | 8.2 | |||||||
Thermal shock resistance | ℃ | Tc | 250 | 200 | 200 | |||||||
Thermal conductivity | w/mok | 20℃ | 16 | 30 | 30.4 | |||||||
Volume resistivity | Ohm/cm2 | 100℃ | >1013 | >1014 | >1014 | |||||||
Dielectric breakdown strength | KV/mm | 8.7(220) | 8.7(220) | 8.7(220) | ||||||||
Dielectric constant | (E) | 1MHz25℃ | 9 | 9.7 | 9.7 | |||||||
Dielectric constant (100MHz) | (E) | 9.5 |