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Detailed introduction/parameters/applications/functions/maintenance of Al2O3 High purity alumina ceramic crucible
▼Heating and Cooling Suggestions
Recrystallized Alumina crucibles are sensitive to thermal shock.
Heat up: Warm up the furnace chamber gradually. Heating rate of 3-4 °C per minute is recommended for the first 1-2 hours to reduce the impact of thermal shock. Maximum recommended heating rate 6 °C per minute.
Cool down: Lower the temperature as gradually as possible. Recommended cooling down rate is more severe than corresponding heating rate and should be retained below 5 °C per minute. It is better to remove the crucibles from the hot zone only if the temperature drops below 100 °C. When taking the crucibles out of furnace and bring them into room temperature to pour the melted material try to make the process as gradual as possible. A better practice is after pouring the melted metal to restore the crucible back into the furnace and leave it cool down inside the furnace.
▼Available Shapes
| ✔Conical |
✔Cylindrical |
✔Classic Form |
✔Dishes |
| ✔Rectangualr |
✔Boats |
✔Lids |
✔Custom Shapes |
▼Atmosphere - Chemical Compatibility - Corrosion
Alumina crucibles can be used at high temperature under oxidizing (air), reduced, or inert (Nitrogen, Argon) conditions with no restriction. They resist attack by all gases except wet Fluorine and they can also be used under vacuum conditions, although exhibit a rate 10-7 to 10-6 g/cm2.sec of weight loss.
Alumina crucibles have very good chemical resistance against diluted or concentrated Acids (with the exception of hydrofluoric acid and phosphoric acid), Alkalis, Melted Metals and Halogens. Alumina is insoluble in water and has negligible solubility in strong acid and alkaline solutions. The low chemical solubility of alumina ceramics components makes them highly resistant to chemical corrosion. The ultra-high final firing temperature that Alumina crucibles are exposed during manufacturing process improves even further this behavior. The almost zero porosity and excellent smoothness of Thermansys crucibles surface prevents chemical attack. Generally, Alumina crucibles are the material of choice for a wide range of general purpose laboratory and industrial applications.
Chemical erosion of ceramic materials is not easy to be measured and determined in a way that will lead to accurate and represented scientific data for all shapes and sizes.
▼Properties
| ✔High melting point (2054 °C) and Boiling point (2977 °C) |
✔Great thermal shock resistance |
✔High compressive strength |
| ✔Transparent to microwave radio frequencies |
✔Electrical insulations properties |
✔Low thermal expansion |
▼Health and Safety
Our ceramic materials, as they are delivered, do not contain substances dangerous to health, or create them during use. They are produced using natural inert raw materials. Any organic binder or other substances used during manufacturing are burned through production firing.
The product at its final delivery form is fully dense and do not produce dust during normal handling and operation. However, if the customer desires to proceed with further product processes like cutting or drilling inert dust might be created. Workers therefor should be provided with suitable dust protection equipment. |
