The role and precautions of alumina crucible

 When the solid is heated with a high fire, a silicon carbide crucible must be used. When using crucibles, the crucible lid is usually tilted over the crucible to prevent the heated material from jumping out and to allow air to enter and exit freely for possible oxidation reactions. Due to the small bottom, the crucible usually needs to be placed on a mud triangle and heated directly with fire. The crucible can be placed on an iron tripod and placed on its own according to the needs of the experiment. Once the crucible is heated, do not immediately place it on a cold metal table to avoid breaking due to sharp cooling. Do not place on a wooden table top immediately to avoid scalding the table top or causing a fire. The correct way is to put it on an iron tripod to cool naturally, or to place it on an asbestos mesh to cool slowly. Please use crucible pliers.

When the solids are heated over high heat, a crucible must be used. When using silicon carbide crucibles, the crucible lids are usually placed at an angle over the silicon carbide crucibles to prevent the heated object from jumping out, allowing air to enter and exit freely for possible oxidation reactions. Due to the small size of the bottom of the crucible, it is usually necessary to place it on a mud triangle and heat it directly with fire. The crucible can be placed upright or obliquely on an iron triangle stand and can be placed on its own as needed for the experiment. Do not place the crucible on a cold metal table immediately after heating to avoid breaking due to sharp cooling. Do not place on a wooden table top immediately to avoid scalding the table top or causing a fire. The correct way is to put it on an iron tripod to cool naturally, or to place it on an asbestos mesh to cool slowly. Please use crucible pliers.

Natural corundum is almost pure alumina. Artificial corundum is made of pure alumina sintered at high temperature, with high temperature resistance, a melting point of 2045 °C, high hardness, and considerable corrosion resistance to acids and alkalis.

Precautions

Corundum crucibles can be used for the melting and sintering of certain alkaline fluxes, but the temperature should not be too high and the time should be as short as possible. In some cases, it can replace nickel and platinum crucibles, but it cannot be used for aluminum and aluminum interference.