Crucibles can break easily if not handled and maintained properly, due to their high-temperature resistance and chemical stability requirements. Factors such as rough handling, improper charging, and environmental conditions can contribute to their breakage.
Firstly, the physical condition of crucibles plays a significant role in their durability. Crucibles with rough edges, dents, and dings, such as "A Shape" crucibles, may not appear as finished as other types but do not affect performance. However, crucibles should be tested for cracks before each use, as damaged crucibles can lead to breakage during operation. A good ceramic crucible will produce a "ring" when hit with a soft hammer, while a damaged one will "clunk."
Secondly, the way crucibles are charged can impact their longevity. If a furnace is charged with molten metal, it may not require a crucible highly resistant to physical damage. However, if heavy materials like metal ingots are involved, a mechanically strong crucible with excellent impact resistance is recommended. Crucibles with high carbon content and a directionally oriented graphite structure can withstand physical shocks. Additionally, a durable protective glaze is essential to prevent oxidation damage from rough handling or sharp-edged materials like extruded aluminum ingots.
Thirdly, proper storage and transportation of crucibles are crucial to prevent breakage. All parts of the crucible should be secured tightly, with additional padding around loose components. Stacking items on top of the crucible should be avoided, as it can cause breakage over time.
Lastly, environmental factors such as direct sunlight and humidity can alter the crucible's structure over time. It is essential to keep high-purity crucibles out of these elements or monitor them closely and take proper precautions.
In summary, crucibles can break easily if not handled with care, charged properly, stored and transported correctly, and protected from adverse environmental conditions. Regular inspection and maintenance are necessary to ensure their longevity and prevent breakage.
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