Cooper and Eaton (1962) studied the compaction behavior of four ceramic powders. In each case it, was assumed that compression is attained by two nearly independent probabilistic processes, namely, the filling of voids having equal size as particles and filling of voids smaller than particles. Based on these assumptions, the following equation (2) was given:

V0-V

—— тг=а1е p +a2e p

v0 VS

where, VO = volume of compact at zero pressure, m3; V = volume of compact at pressure P, m3; Vs = void free solid material volume, m3; ait a2, ki, and k2 = Cooper-Eaton model

constants.

The difficulty in practical use of equation (2) is the assignment of some physical significance to the constant parameters. In addition, another drawback of this model is its applicability to only one-component system (Comoglu, 2007).