Abstract
Some times, graphite are used for the rotor of viscometers and for the crusible, in which slag is melted, for the viscosity measurement.
The slip between graphite rotor and molten slag was neglegibly small in this work with the circumferential velocity of the rotor of about 0.1-2cm/sec. However, the slip may not be neglegible, when the rotor velocity increased in highly viscous flow.
The viscosity was decreased by addition of graphite powder and the activation energy for viscous flow was increased at higher temperature range.
Therefore, it should be avoided to use graphite for the detecting parts of viscometers or for the crucible when graphite reacts chemically with molten slag or may be dispersed in slag as suspended particles.
