| The effects of minor additions such as Li20, ZnO, A/20 3 MgO, NiO etc. on
the sintering and grain growth of technical titania from 1100°C to 1400°C have
been investigated. The effect of additives varies with the sintering temperature.
The linear shrinkage of specimens at relatively lower temperatures is given
by the expression ft=- tk where I represents the diameter of the specimens, t
is the time of soaking at shrinkage temperature and k is a rate constant.
The variation of K with temperature T CO K) follows an exponential expression
k=k0e -E/RT where E is the activation energy of sintering. It has been observed
that the value of E decreases with minor additions of the above oxides. |
