How many times will a high pure graphite stick turn red at temperature?
When the temperature reaches 400 degrees, the graphite turns red and then begins to oxidize, but the oxidation rate is slow.
With the increase of temperature, the oxidation rate is increased, if the nitrogen protection, can reduce the oxidation rate, so some high temperature furnace, vacuum furnace and vacuum extraction is to prevent the oxygen in the air oxidation of graphite, McNair to answer your questions.
