Slow heat conduction
Understanding the Benefits of Graphite Silicon Carbide Crucibles
The issues mentioned can significantly impact the performance of graphite silicon carbide crucibles.
1. There is no preheating according to standard procedures.
2. Slag influences heat conduction.
3. The crucible has reached its service life.
Crucible corrosion
1. Add flux before the metal is molten or excessive use of flux.
2. Some fluxes contain corrosive substances.
3. Fuel contains corrosive substances.
4. Abnormally high-temperature operation may cause the glaze layer to melt, similar to corrosion.
Excessive oxidation
1. The flame in the furnace is directly against the bottom of the crucible.
2. The temperature in the top area is too low.
3. The working temperature is overheated.
4. Improperly hoisting or moving damages glaze layer.
5. The emergent drain hole is open.
Explosion
1. The crucible will heat up quickly when it is damp during storage or transportation.
2. The crucible heats up rapidly during the preheating procedure.
3. The added materials are not completely dry.
Middle or bottom cracks
1. The crucible is impacted during transportation or installation.
2. The crucible should be placed in the middle of the furnace stack smoothly and stably.
3. An improper graphite stand is used.
4. There is a high temperature difference in the furnace.
5. The metal ingot is placed horizontally or diagonally in the crucible. Metal materials overfill.
6. Slag or molten metal remains in the crucible.
