- High-temperature oxidation
The main component of graphite is carbon. Graphite undergoes visible oxidation under air conditions exceeding 600°C. The products of the carbon oxidation reaction are CO and CO2 gases, which cannot protect the rotor. Generally speaking, the degassing box cannot be completely sealed, and most of the inner cavities of the box are not filled with protective gas, so the oxidation of the graphite rotor is inevitable. As a result of the oxidation, the diameter of the rotor shaft gradually becomes smaller until it breaks and is scrapped.
- Aluminum liquid scouring
The graphite rotor is immersed in the aluminum liquid in the degassing box. It usually rotates at a speed of 200r/min~400r/min and strongly agitates the aluminum liquid. The aluminum liquid will cause strong erosion and friction on the rotor. Especially the contact area between the liquid level and the rotor rod gradually becomes thinner and will eventually break and be scrapped.
- Transmission system impact
The transmission system of the degassing device is unstable, especially the connection with the rotor is not concentric. The rotor swings during operation. On the one hand, the friction between the rotor and the sealing plug causes damage; on the other hand, the tumbling of the liquid level increases, and the oxidation and erosion of the rotor intensif.accelerate the loss of the rotor.
If the loss is caused by defective materials or processing, our company will bear the full responsibility.