What happens when carbon carbon crucibles are cracked?
If the whole crucible is used, the external force of the crucible will cause the fiber damage of the carbon crucible when the quartz crucible is taken.In addition, the carbon carbon crucible may cause cracks during the fabrication of the preform.
After a long period of use, its silicon vapor corroded the edges of the carbon and carbon parts;
The R corner is part of gravity and expansion forces;
