1. The improvement of densification by an external gas pressure after pore isolation is far more pronounced in liquid phase sintering than in solid state sintering. Application of even a few atm pressure is very effective in liquid phase sintering, in contrast to the case of solid state sintering. Explain why the external pressure effect is different between solid state sintering and liquid phase sintering. What is the implication of your answer?
2. Discuss the effect of mixedness of two elemental powders on densification during liquid phase sintering.