1993 Volume 79 Issue 5 Pages 555-560
The effects of the temperature and MgO content on the sintering characteristics of NiO were investigated by measuring the porosity, the specific surface area and the grain size. NiO compacts containing 0 to 20mol%MgO were sintered over the temperature range 1273 to 1773K in air.
The results were summarized as follows.
1) The sintering proceeded remarkably at higher temperature than 1473K.
2) Both of the prosity and the specific surface area decreased with increasing the temperature and MgO content. The effect of MgO addition on the decrease in the specific surface area was more significant than that on the decrease in the porosity.
3) Grain growth was expressed as 1/3 power function of time. The addition of MgO accelerated both the grain growth and the closed pore formation.
4) Sintering mechanism was explained by bulk diffusion of oxygen ion.
5) Lattice constant increased linearly with MgO content.
