The best metal for a crucible depends on the specific requirements of the melting process, including the type of metal being melted, the furnace conditions, and the crucible's handling and thermal properties. For melting copper-based alloys in fuel-fired furnaces, roller formed silicon carbide crucibles are preferred due to their high thermal shock resistance. For furnaces where the crucible is subjected to physical shocks or rough handling, crucibles with high carbon content and a directionally oriented graphite structure are recommended for their excellent impact resistance. In refining and melting precious metals, crucibles that are dense and have a durable protective glaze are essential to prevent metal penetration and ensure clean metal. For operations involving rapid temperature changes or superheating, crucibles with high thermal shock resistance are necessary. The choice of crucible material also depends on the chemical properties of the alloy being melted, with graphite crucibles suitable for metals that do not react with carbon, and zirconia refractory materials suitable for alloys with high chemical activity.
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