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Silver can be melted and poured into molds to create a variety of products including jewelry, decorative items, cutlery, and containers. When melting and holding molten metal, a crucible’s material choice, structure, and manufacturing process all play a role in its ability to withstand high temperatures. In this article, we will take a look at the different factors that can impact the performance of a silver crucible and how to ensure the best results.
The crucible is made of clay-graphite-ceramic bonded or silicon carbide-carbon bonded graphite. This type of crucible can withstand a wide range of temperature ranges and is often used in the melting of aluminum and aluminum alloys, copper and copper-based alloys, cupro-nickel and nickel-bronze alloys, precious metals, and zinc. These crucibles are formed using either isostatic molding or compression molding, both of which are processes that apply great hydraulic pressure to graphite powder in a steel mold. This results in a crucible with a high density and small particle size which contributes to its strength, durability, and resistance to corrosion.
When choosing a crucible for your particular application, you will want to make sure that it can handle the maximum and minimum temperature limits of your operational practices. You may also need a crucible that can withstand rapid changes in temperature since many operations require a fast melting and holding of metal. In these situations, a crucible with high thermal shock resistance is often recommended since it can withstand temperature fluctuations that could otherwise crack or damage the crucible.