Alumina crucible is also called Corundum crucible, it is a common crucible in the laboratory as the accessories fitting of most Resistance Furnaces. With high-temperature resistance and corrosion resistance, widely used in the box resistance furnace.
After using the ceramic corundum crucible for the experiment, some crystals produced. Sometimes the materials will since on the surface of the alumina crucibles. In this situation, cleaning will be troublesome. If don’t clean the crucible, it will affect using in the future Even use it once and throw it away, which is a huge waste. Do you know how to clean it? Here are the 3 most effective ways for cleaning alumina crucibles.
- Acid Soak. At present, the common method of cleaning corundum crucible is the acid bubble method, because most sintered materials can basically react with acid, the acid bubble is usually soaked with nitric acid if the area to be removed is large, can Be appropriately increased soaking time, 5 to 24 hours can be based on the removal of the difficulty of the decision to soak time, or can not remove with ultrasonic vibration can be removed after cleaning, it can be dried and cooled.
- Thermal decomposition. The nitrate in the corundum crucible can be removed by thermal decomposition, but care should be taken not to speed up the temperature to avoid causing the crucible to crack. After drying, the high-temperature furnace is slowly heated to 800 °C for over 6 hours. The crucible is then dried and cooled naturally for further use.
- 3.For some simple stains and residues, you can use physical methods for mechanical cleaning residues, can easily remove the need not to use too much trouble, for the use of too many methods can not remove large areas of stains, it is necessary to replace the crucible, after all, the careful sintering process once some impurities will affect the results.
Points to note:
- The link of drying the crucible: pay attention to the heating rate of the high-temperature furnace must not be fast, otherwise, the crucible will change the skin (burst breakage), it is suggested that the temperature should be raised slowly to 800 °C through 6 hours for drying treatment Finally, the crucible is taken out after natural cooling and placed in a dry place for the next use.
- The fused alumina crucible is composed of porous fused alumina, which is hard and resistant to melting. It is suitable to use some weak basic materials such as anhydrous Na2c03 as the fused sample It is not suitable to use NA202, NaOH and acid as a flux (such as K2s 207) to melt samples.
- Should be based on the capacity of the crucible feeding, avoid putting too much material squeezed too tight, so as not to cause metal thermal expansion crack the crucible.
The above is some about the corundum crucible cleaning method introduction, in order to avoid affecting the use and reduce the frequency of cleaning, in the sintering, must strictly follow the regulations to use, more about the laboratory corundum crucible, the porcelain boat, ceramic pieces.
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