Silicon carbide crucible

Silicon carbide crucible Preheating steps:
Special care is required during the preheating process of silicon carbide crucibles to prevent problems such as thermal expansion, bottom detachment, delamination or cracking caused by residual moisture. Specific steps are as follows:

First baking: Bake in the oven without adding any materials and keep warm for more than 24 hours. During this process, rotate the crucible regularly to ensure even heating and to completely remove moisture from the walls of the crucible.

Gradually heat:
First preheat the crucible to 150 to 200 degrees Celsius and hold for 1 hour.
Then, increase the temperature at a rate of 150 degrees Celsius per hour until a higher temperature is reached. During this process, avoid prolonged exposure of the crucible walls to temperatures between 315 and 650 degrees Celsius, as the crucible will oxidize rapidly in this temperature range, shortening its service life and reducing its thermal conductivity.

High temperature treatment:
Once preheating is completed, the crucible does not need to be preheated again unless exposed to moisture and can be used continuously.
After preheating is completed, quickly raise the temperature to 850~950℃, keep it without adding materials for half an hour, then lower it to the normal operating temperature and start adding materials. This treatment effectively extends the service life of the crucible.

Other preprocessing methods:
In addition to the above preheating steps, the following methods can also be used:

Preheat via oil burner: Placing the crucible next to the oil burner can help remove moisture.
Burning charcoal or wood: Burning charcoal or wood further in a crucible helps remove moisture.

Choosing the correct crucible size"
Silicon carbide crucible dimensions vary by manufacturer and specific application. Therefore, when selecting, please refer to specific product specifications or consult the supplier for accurate information. Choosing the right crucible based on your needs can improve production efficiency and product quality.

By following the correct preheating and handling procedures, silicon carbide crucibles can maximize their performance, extend their service life, and provide reliable assurance for your production process.