Abstract
In order to simplify experimental procedures a model study with a low melting-point material (benzoic acid) has been performed to study the mechanism of pressure sintering.
Theoretical equations for the pressure sintering were derived assuming the viscous flow mechanism with the applied pressure as the only driving force for the densification. This viscous flow mechanism was found to be applicable to the pressure sintering of benzoic acid crystal powder assuming Newtonian solid for the high temperature range and Bingham solid for the low temperature range.
The boundary temperature of these two temperature ranges falls with.the increase of the applied pressure and was found to coincide with the melting-point when the applied pressure becomes zero.
Activation energy of the flow in Newtonian range and the final attainable porosity in Bingham range were calculated.
It was found that this kind of model experiniefit is quite effective in the research of pressure sintering mechanism.
