Densification pressure-assisted sintering

Power-law creep can also be a major densification mechanism in pressure-assisted sintering. At the early stage of densification achieved by power-law... 

Comparison of Eqs (5.27) and (5.28) with Eqs (5.9) and (5.10) shows that the densification rate by the capillary pressure is higher than that by the externally applied pressure under certain conditions. This result is due to the reduction of pore size and the increase in capillary pressure above the external pressure with pore size reduction. The very final densification is thus expected always to be governed by pressureless sintering kinetics. The densification rate in pressure-assisted sintering is, of course, the sum of those due to the capillary pressure (Eqs (5.9) and (5.10)) and to the external pressure (Eqs (5.27) and (5.28)). The contribution of capillary pressure increases as the external pressure decreases and also as the pore size decreases with densification. 

Discuss the effects of particle shape on densification during pressure-assisted sintering and pressureless sintering. 

Effects of particle size and pressure on the reactive sintering were studied by Gobran et al. (2004). The synthesis of RuAl was described it was observed that reactive systems containing low-melting constituents such as aluminium are assisted in densification by the formation of a transient liquid phase. Reactive sintering using... 

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