Alumina crucible is an important equipment in the smelting industry. Usually, the alumina content of the crucible is more than 95%, which is called corundum crucible.
The shape of corundum crucible is generally arc-shaped and cylindrical, while pure alumina crucible includes arc-shaped alumina crucible, square alumina crucible, alumina corundum ark (rectangular alumina ceramic crucible), straight (cylindrical) alumina crucible and various special-shaped alumina ceramic crucibles.
Alumina crucible is characterized by high temperature resistance, acid and alkali resistance, quench and heat resistance and chemical corrosion resistance.
Alumina crucible is suitable for melting samples with anhydrous Na2CO3 and other weak alkaline substances as flux, but not with Na2O2, NaOH and other strong alkaline substances and acidic substances as flux (such as K2S2O7, etc.).
The general specification of alumina crucible is 5-1000ml.
Operating principle of alumina crucible:
1. 99.70% corundum 1800 ℃ - 1650 ℃ - 1700 ℃ corundum crucible has excellent high-temperature insulation and mechanical strength in oxidation and recovery atmosphere. High thermal conductivity and low thermal expansion. Above 1700 ℃, it has no reaction with air, steam, hydrogen, carbon monoxide, etc. The maximum short-term service temperature is 1800 ℃.
2. 99.35% corundum 1750 ℃ - 1600 ℃ - 1650 ℃ corundum crucible in oxidation and recovery atmosphere.
3. 85.00% High Aluminum 1350 ℃ 1290 ℃ high aluminum crucible has excellent high temperature insulation and mechanical strength in oxidation and recovery atmosphere. High thermal conductivity and low thermal expansion. It has no reaction with air, water vapor, hydrogen, carbon monoxide, etc. It can be used for a long time when the temperature field changes little. The maximum short-term service temperature is 1400 ℃.