What should be paid attention to in the selection of graphite crucible materials?

The crucible is used for smelting, and the temperature is usually extremely high, so the raw materials for making the crucible should have high refractoriness and a strong high temperature resistance coefficient. In addition, the raw material of the crucible must have sufficient strength, and it will be worn by the impact of high temperature during the smelting process. Therefore, if the strength of the raw material is not high, it is likely to cause the crucible to become more wavy and less tough as it is used.
The shrinkage coefficient of the crucible should be small, and it can withstand rapid changes in temperature without deformation and fracture. In addition, in the selection of materials, attention should be paid to not having a chemical reaction with the molten metal, and the high temperature resistance of the chemical metal should also be high. Churn occurs. High temperature is required when smelting metals, and the selection of crucible materials should ensure chemical stability at high temperatures. It can be seen that a lot of attention should be paid to the selection of crucible materials, and different materials should be used for different purposes. For example: graphite crucible should be used for smelting aluminum and aluminum alloy.