The main difference between clay graphite crucibles and silicon carbide crucibles lies in their composition and properties.
1. Composition: Clay graphite crucibles are made of a mixture of 30-50% clay and 50-70% carbon powder. On the other hand, silicon carbide crucibles predominantly consist of silicon carbide. This difference in composition results in different physical and chemical properties.
2. Heat conductivity and strength: Silicon carbide crucibles have higher heat conductivity and greater strength compared to clay graphite crucibles. This makes silicon carbide crucibles more popular in industrial applications where extreme temperatures must be reached or maintained.
3. Appearance: High purity graphite crucibles, which are commonly used in laboratory work, appear glossy black. Clay graphite crucibles, on the other hand, have a matte grey appearance due to their higher porosity levels compared to pure carbon varieties.
4. Machinability: High purity graphite crucibles can be machined down to finer tolerances with greater detail compared to clay graphite crucibles. This is due to the superior properties of high purity graphite related to thermal conductivity and electrical resistivity. Therefore, high purity graphite crucibles are preferred for applications that require precision parts.
5. Pricing: The pricing of crucibles can vary greatly depending on specification requirements and country of origin. For example, Chinese manufactured high purity products tend to be less expensive compared to domestically sourced or European products. However, the price-performance ratio should be considered when selecting a crucible.
In summary, silicon carbide crucibles are preferred in industrial applications due to their higher heat conductivity and greater strength. High purity graphite crucibles are commonly used in laboratory work and offer advantages such as heat resistance, machinability, and precision. The choice between these two types of crucibles depends on the specific requirements of the application.
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