Why Does a Graphite Boat Turn White?
Graphite products are well-known and commonly used in daily life, but not everyone is familiar with graphite boats. A graphite boat is essentially a graphite mold, used as a carrier to hold raw materials and components for high-temperature sintering, shaping, and positioning. Sometimes, people refer to graphite boats as graphite molds.
A common issue with graphite boats is the appearance of a white discoloration. Typically, graphite products are black, so why does a graphite boat turn white? Here are the main reasons for this phenomenon:
- Improper Process Parameters: Incorrect process parameters can lead to the whitening of the edges of the graphite boat.
- Accelerated Aging Due to Process Parameters: Improper process parameters can indirectly cause the graphite boat to age more quickly, resulting in a white discoloration. This is mainly due to an excessively high total amount of SiH4 (silane) plasma.
Understanding and controlling these parameters can help maintain the integrity and appearance of graphite boats, preventing premature aging and discoloration.