| The nature of attack of V20 0 melts on polycrystaUine alumina and
fused silica rods was studied under conditions of forced convection
dissolution at several temperatures in the range 800°-l000°C. The
rate of corrosion as a function of the square root of angular velocity
of rotation at various temperatures was found to be linear. This was
in agreement with the theoretical model of forced convection dissolution.
Using the experimental data, the effective ditrusivities were
calculated for both silica and alumina. Throughout the temperature
range of the present investigation, alumina was found to have greater
ditrusivity. As the dissolution was diffusion-controlled, it was concluded
that silica would act as a better refractory than alumina in
vanadium-rich environments. |
