Abstract
Pressure sintering processes on powder crystals of Adipic acid, β-Naphthol, Phthalic acid anhydride and Salicylic acid have been studied.
All of these processes were expressed by the equation, log(1+k1logε)=k2t+k3, which was derived assuming a viscous flow mechanism of a Bingham solid. Where ε is the porosity of the powder bed at time t.
Temperature and applied pressure dependencies of the constants k1 and k3 were studied. It was found that the effective stress on pores is proportional to the applied pressure, and the decrease of the yield stress with the temperature becomes sharp at the temperature of approximately thirty degrees below the melting-point.
