Cylindrical 99% Alumina Ceramic Crucible For High Temeprature
Furnace
Introduction of alumina ceramic crucible :
Corundum ceramic crucible, also known as alumina crucible, 99.70%
corundum crucible in 1800℃1650℃- 1700℃ corundum crucible in the
atmosphere of oxidation and reduction, has a good high temperature
insulation and mechanical strength.High thermal conductivity, small
thermal expansion.Does not react with air, water vapor, hydrogen,
carbon monoxide and so on above 1700℃.Short-term maximum service
temperature 1800℃.
99.35% Corundum ceramic crucible has good high temperature
insulation and mechanical strength in oxidation and reduction
atmosphere
85% High alumina crucible 1305℃ 1290℃ has good high temperature
insulation and mechanical strength in oxidation and reduction
atmosphere.High thermal conductivity, small thermal expansion.It
doesn't react with air, water vapor, hydrogen, carbon monoxide,
etc.It can be used for a long time under the condition of little
change of temperature field.Short-term maximum service temperature
1400℃
Alumina ceramic crucible feature
1. Corundum crucible is suitable for melting samples with anhydrous
Na2CO3 and other weak alkaline substances as flux, but not suitable
for melting samples with Na2O2, NaOH and other strong alkaline
substances and acidic substances as flux (such as K2S2O7 and so on)
2. Resistance to high temperature, acid and alkali, cold and hot,
chemical corrosion
3. The color is white or beige
Technical parameter of alumina ceramic crucible:
| SiO2 Content | % | - |
| Density | g /cm3 | 3.88 |
| Water Absorption | % | 0.01 |
| Compression Strength at Room Temperature | MPa | 350 |
| Leakage Rate 20℃ | Torr/ L. Sec | <10-11 |
| Bending Strength | mm | ≤0.2mm 1600℃ |
| Bonding at High Temperature | - | No Bonding 1600℃ |
| Thermal Expansion Coefficient 20-1000℃ | mm. 10-6/℃. m | 8.2 |
| Thermal Conductivity | W/ m. k | 25 |
| Electric Insulation Strength | KV/ mm | 20 |
| DC Insulation Resistance 20℃ | Ohm/ cm | 1014 |
| High Temperature Insulation Resistance | 1000℃ MΩ | ≥0.08 |
| 1300℃ MΩ | ≥0.02 |
| Resistance To Thermal Shock | - | No Cracks 1550℃ for 4 times |
| Max. Temperature | ℃ | 1800 |
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